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Rufino FM, Vasconcelos DLM, Freire PTC, Oliveira RC, Remédios CMR, da Silva JH, Alabarse FG, Lima JA. In situ Raman spectroscopy and synchrotron X-ray diffraction studies on maleic acid under high pressure conditions. Spectrochim Acta A Mol Biomol Spectrosc 2023; 303:123264. [PMID: 37611523 DOI: 10.1016/j.saa.2023.123264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 08/08/2023] [Accepted: 08/14/2023] [Indexed: 08/25/2023]
Abstract
Maleic acid was studied by Raman spectroscopy and powder synchrotron X-ray diffraction (XRD) under high pressure conditions by using a diamond anvil cell. The Raman spectroscopy measurements were performed from ambient pressure up to 9.2 GPa in the 100-3200 cm-1 spectral range. While the XRD measurements were performed up to 10.1 GPa. Here we present the pressure-dependence behavior from both the Raman modes and cell parameters. Maleic acid lattice parameters decrease anisotropically as a function of pressure and a reduction of 27% in the volume of the unit cell was observed. Modifications in the material's compressibility were observed at around 2 and 6 GPa.
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Affiliation(s)
- F M Rufino
- Departamento de Física, Universidade Federal do Ceará, C. P. 6030, CEP 60455-900 Fortaleza, CE, Brazil
| | - D L M Vasconcelos
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.902-098 Quixadá, CE, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, C. P. 6030, CEP 60455-900 Fortaleza, CE, Brazil
| | - R C Oliveira
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 - Belém-PA, Brazil
| | - C M R Remédios
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 - Belém-PA, Brazil
| | - J H da Silva
- Universidade Federal do Cariri, CEP 63000-000 Juazeiro do Norte, CE, Brazil
| | - F G Alabarse
- Elettra Sincrotrone Trieste, S.S. 14 km 163.5, Area Science Park, 34149 Basovizza, Trieste, Italy
| | - J A Lima
- Departamento de Física, Universidade Federal do Ceará, C. P. 6030, CEP 60455-900 Fortaleza, CE, Brazil.
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2
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Saraiva GD, Ramiro de Castro AJ, Teixeira AMR, Sousa Neto VO, Lima JA, Juca RF, Soares JM, Freire PTC, de Sousa FF, Paraguassu W. Pressure-dependence Raman spectroscopy and the lattice dynamic calculations of Bi 2(MoO 4) 3 crystal. Spectrochim Acta A Mol Biomol Spectrosc 2023; 297:122711. [PMID: 37054566 DOI: 10.1016/j.saa.2023.122711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 03/28/2023] [Accepted: 04/03/2023] [Indexed: 05/14/2023]
Abstract
This work reports a pressure-dependent Raman spectroscopic study and the theoretical lattice dynamics calculations of a Bi2(MoO4)3 crystal. The lattice dynamics calculations were performed, based on a rigid ion model, to understand the vibrational properties of the Bi2(MoO4)3 system and to assign the experimental Raman modes under ambient conditions. The calculated vibrational properties were helpful to support pressure-dependent Raman results, including eventual structural changes induced by pressure changes. Raman spectra were measured in the spectral region between 20 and 1000 cm-1 and the evolution of the pressures values was recorded in the range of 0.1-14.7 GPa. Pressure-dependent Raman spectra showed changes observed at 2.6, 4.9 and 9.2 GPa, these changes being associated with structural phase transformations. Finally, principal component analysis (PCA) and hierarchical cluster analysis (HCA) were performed to infer the critical pressure of phase transformations undergone by the Bi2(MoO4)3 crystal.
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Affiliation(s)
- G D Saraiva
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.902-098 Quixadá, CE, Brazil.
| | - A J Ramiro de Castro
- Universidade Federal do Ceará - Campus Quixadá, Cedro, Quixadá, CE 63902-580, Brazil
| | - A M R Teixeira
- Faculdade de Filosofia Dom Aureliano Matos, Universidade Estadual do Ceará, CEP 62.930-000 Limoeiro do Norte, CE, Brazil
| | - V O Sousa Neto
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.902-098 Quixadá, CE, Brazil
| | - J A Lima
- Departamento de Física, Universidade Federal do Ceará, CEP 60.455-970 Fortaleza, CE, Brazil
| | - R F Juca
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.902-098 Quixadá, CE, Brazil
| | - J M Soares
- Departamento de Física, Universidade do Estado do Rio Grande do Norte, Mossoró-RN CEP 59610-210, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, CEP 60.455-970 Fortaleza, CE, Brazil
| | - F F de Sousa
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil
| | - W Paraguassu
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil
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3
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Alvarenga L, Cardozo LFMF, Ribeiro-Alves M, Damasceno NRT, Berretta AA, Lima JA, Khosla P, Fouque D, Mafra D. Effects of turmeric extract supplementation on the lipid and lipoprotein subfraction profile in hemodialysis patients: A randomised, double-blind, crossover and controlled trial. Phytother Res 2023; 37:3424-3437. [PMID: 37042623 DOI: 10.1002/ptr.7814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 03/16/2023] [Accepted: 03/18/2023] [Indexed: 04/13/2023]
Abstract
Dyslipidemia is common in patients with chronic kidney disease. Curcumin, a bioactive polyphenol from Curcuma longa, can improve lipid profile. This study aims to analyze the effects of Curcuma Longa extract supplementation on lipid profile and lipoprotein subfractions in hemodialysis (HD) patients. This is a longitudinal, double-blind, washout-period randomized clinical trial. The patients were randomized into two groups: the curcumin group (n = 10) (orange and carrot juice with 2.5 g of Curcuma Longa extract) and the control group (n = 11) (juice without curcumin) 3x/w during HD sessions for 3 months. After the washout period, patients continued the supplementation as a crossover for the same period. The lipid profile was measured using enzymatic assays. The high-density lipoprotein and low-density lipoprotein subfractions analyses were performed using LipoprintTM. In the curcumin group, the triglyceride values tended to decrease with a different triglyceride variation between the pre and post-intervention for the control and curcumin groups of 38.5 (19.8) mg/dL (p = 0.06). There was no statistical difference in the others parameters. In conclusion, Curcuma longa extract may be a good nutritional strategy to reduce triglyceride plasma levels in hemodialysis patients, but it seems ineffective for the other parameter.
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Affiliation(s)
- L Alvarenga
- Graduate Program in Biological Sciences-Physiology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - L F M F Cardozo
- Graduate Program in Cardiovascular Sciences, Fluminense Federal University (UFF), Niterói, Brazil
| | - M Ribeiro-Alves
- HIV/AIDS Clinical Research Center, National Institute of Infectology (INI/Fiocruz), Rio de Janeiro, State of Rio de Janeiro, Brazil
| | - N R T Damasceno
- Department of Nutrition, Faculty of Public Health, University of São Paulo (FSP-USP), São Paulo, Brazil
| | - A A Berretta
- Research, Development, and Innovation Department, Apis Flora Indl. Coml. Ltda., Ribeirão Preto, São Paulo, Brazil
| | - J A Lima
- Research, Development, and Innovation Department, Apis Flora Indl. Coml. Ltda., Ribeirão Preto, São Paulo, Brazil
| | - P Khosla
- Department of Nutrition and Food Science, Wayne State University, Detroit, Michigan, USA
| | - D Fouque
- Department of Nephrology, Centre Hopitalier Lyon Sud, INSERM 1060, CENS, Université de Lyon, Lyon, France
| | - D Mafra
- Graduate Program in Biological Sciences-Physiology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
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4
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Pinho EKS, Silva Filho JGD, Sousa FF, Freire PTC, Lima JA, Dos Santos AO, Filho PFF. Phase transitions of L-histidinium hydrogen oxalate crystal under high pressures investigated by Raman spectroscopy. Spectrochim Acta A Mol Biomol Spectrosc 2023; 298:122800. [PMID: 37156174 DOI: 10.1016/j.saa.2023.122800] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 03/27/2023] [Accepted: 04/26/2023] [Indexed: 05/10/2023]
Abstract
L-histidinium hydrogen oxalate (L-HisH)(HC2O4) crystal is formed from amino acid. L-histidine with oxalic acid whose vibrational high pressures behavior have not yet been investigated in the literature. Here we synthesized (L-HisH)(HC2O4) crystal by slow solvent evaporation method in a 1:1 ratio of L-histidine and oxalic acid. In addition, a vibrational study of (L-HisH)(HC2O4) crystal as a function of pressure was performed via Raman spectroscopy in the pressure range of 0.0-7.3 GPa. From analysis of the behavior of the bands within 1.5-2.8 GPa, characterized by the disappearance of lattice modes, the occurrence of a conformational phase transition was noted. A second phase transition, now from structural type, close to 5.1 GPa was observed due to the incidence of considerable changes in lattice and internal modes, mainly in vibrational modes related to imidazole ring motions.
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Affiliation(s)
- E K S Pinho
- Centro de Ciências de Imperatriz, Universidade Federal do Maranhão, CEP, 65900-410 Imperatriz, MA, Brazil
| | - J G da Silva Filho
- Centro de Ciências de Imperatriz, Universidade Federal do Maranhão, CEP, 65900-410 Imperatriz, MA, Brazil
| | - F F Sousa
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP, 66075-110 Belém, PA, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, CEP, 60455-970 Fortaleza, CE, Braazil
| | - J A Lima
- Departamento de Física, Universidade Federal do Ceará, CEP, 60455-970 Fortaleza, CE, Braazil
| | - A O Dos Santos
- Centro de Ciências de Imperatriz, Universidade Federal do Maranhão, CEP, 65900-410 Imperatriz, MA, Brazil
| | - P F F Filho
- Centro de Ciências de Imperatriz, Universidade Federal do Maranhão, CEP, 65900-410 Imperatriz, MA, Brazil.
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Trindade-Filho EM, Pai JD, Castro DND, Silva ATMD, Costa AF, Vieira JSS, Santos SDBD, Félix VB, Leão SABF, Zambrano LI, Saldanha-Filho AJM, Carvalho EGA, Cavalcante JBN, Quintella GB, Lino ATS, Costa MV, Lima JA, Tavares MMA, de Melo MR, Mousinho KC, Biase CLCLD, Leite ML, Costa PJMS, Becker EL, Moura IMFB, Silva JCD. Dopamine depletion in wistar rats with epilepsy. BRAZ J BIOL 2022; 84:e248411. [PMID: 35544785 DOI: 10.1590/1519-6984.248411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 02/20/2022] [Indexed: 11/22/2022] Open
Abstract
The dopamine content in cerebral structures has been related to neuronal excitability and several approaches have been used to study this phenomenon during seizure vulnerability period. In the present work, we describe the effects of dopamine depletion after the administration of 6-hidroxidopamine (6-OHDA) into the substantia nigra pars compacta of male rats submitted to the pilocarpine model of epilepsy. Susceptibility to pilocarpine-induced status epilepticus (SE), as well as spontaneous and recurrent seizures (SRSs) frequency during the chronic period of the model were determined. Since the hippocampus is one of main structures in the development of this experimental model of epilepsy, the dopamine levels in this region were also determined after drug administration. In the first experiment, 62% (15/24) of 6-OHDA pre-treated rats and 45% (11/24) of those receiving ascorbic acid as control solution progressed to motor limbic seizures evolving to SE, after the administration of pilocarpine. Severeness of seizures during the model´s the acute period, was significantly higher in epileptic experimental rats (56.52%), than in controls (4.16%). In the second experiment, the frequency of seizures in the model's chronic phase did not significantly change between groups. Our data show that dopamine may play an important role on seizure severity in the pilo's model acute period, which seems to be due to dopamine inhibitory action on motor expression of seizure.
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Affiliation(s)
- E M Trindade-Filho
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil.,Universidade Estadual de Ciências da Saúde de Alagoas - UNCISAL, Maceió, AL, Brasil
| | - J Dal Pai
- Instituto do Cérebro do Rio Grande do Sul - InsCer, Porto Alegre, RS, Brasil
| | - D N de Castro
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil
| | - A T M da Silva
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil
| | - A F Costa
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil
| | - J S S Vieira
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil
| | | | - V B Félix
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil.,Hospital Universitário de Alagoas Professor Alberto Antunes - HUPAA, Maceió, AL, Brasil
| | - S A B F Leão
- Santa Casa de Misericórdia de Maceió, AL, Brasil.,Universidade Federal de Alagoas - UFAL, Campus de Arapiraca, AL, Brasil
| | - L I Zambrano
- Universidad Nacional Autónoma de Honduras - UNAH, Facultad de Ciencias Medicas, Tegucigalpa, Honduras
| | - A J M Saldanha-Filho
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil.,Centro Universitário Tiradentes - UNIT-AL, Maceió, AL, Brasil
| | - E G A Carvalho
- Centro Universitário Tiradentes - UNIT-PE, Jaboatão dos Guararapes, Pernambuco, PE, Brasil
| | - J B N Cavalcante
- Universidade Estadual de Ciências da Saúde de Alagoas - UNCISAL, Maceió, AL, Brasil
| | - G B Quintella
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil
| | - A T S Lino
- Universidade Federal de Alagoas - UFAL, Campus de Rio Largo, Alagoas, Brasil
| | - M V Costa
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil.,Universidade Estadual de Ciências da Saúde de Alagoas - UNCISAL, Maceió, AL, Brasil
| | - J A Lima
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil.,Universidade Estadual de Ciências da Saúde de Alagoas - UNCISAL, Maceió, AL, Brasil
| | - M M A Tavares
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil
| | - M R de Melo
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil
| | - K C Mousinho
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil.,Universidade Estadual de Ciências da Saúde de Alagoas - UNCISAL, Maceió, AL, Brasil
| | - C L C L De Biase
- Hospital Universitário de Alagoas Professor Alberto Antunes - HUPAA, Maceió, AL, Brasil
| | - M L Leite
- Universidade Estadual de Ciências da Saúde de Alagoas - UNCISAL, Maceió, AL, Brasil
| | - P J M S Costa
- Universidade Estadual de Ciências da Saúde de Alagoas - UNCISAL, Maceió, AL, Brasil
| | - E L Becker
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil
| | - I M F B Moura
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil
| | - J C da Silva
- Centro Universitário - CESMAC, Campus I, Maceió, AL, Brasil.,Universidade Estadual de Ciências da Saúde de Alagoas - UNCISAL, Maceió, AL, Brasil
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6
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Santos CAAS, Lima RJC, Paraguassu W, da Silva Filho JG, Dos Santos AO, Lima JA, Freire PTC, Filho PFF. High-pressures study by Raman spectroscopy and DFT calculations of L-tyrosine hydrobromide crystal. Spectrochim Acta A Mol Biomol Spectrosc 2021; 263:120142. [PMID: 34273890 DOI: 10.1016/j.saa.2021.120142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 06/24/2021] [Accepted: 06/30/2021] [Indexed: 06/13/2023]
Abstract
The high-pressure Raman spectra of L-tyrosine hydrobromide crystal (LTHBr) were obtained from 1.0 atm to 8.1 GPa in the 100-3200 cm-1 spectral region. The structural conformation and dimensions of the monoclinic unit cell were estimated using the powder X-ray diffraction (PXRD) method and Rietveld refinement using the GSAS program. At atmospheric pressure, the Raman spectrum was obtained in the spectral range of 100-3200 cm-1 and the assignment of the normal modes based on density functional theory calculations was provided. Large wavenumber shifts of modes at 106, 123, and 157 were observed, which were interpreted as the large displacement of the atoms, making the molecule a flexible structure. The change in the slope (dɷ / dP) of these bands between the pressures of 3.0 and 4.0 GPa and the appearance of a mode of low wavenumber indicate the occurrence of a structural phase transition. A band initially observed at 181 cm-1 in the spectrum recorded at 0.7 GPa change the relative intensity with a band at 280 cm-1 (recorded at 5.8 GPa), indicating a conformational transition. In the region of the internal modes, the spectra show changes that reinforce the conformational phase transition since the bands initially at 1247 and 1264 cm-1 observed at 1.0 GPa have their intensities reversed, and at 3.0 GPa it is observed the fusion of the bands at 1264 and 1290 cm-1 (values recorded at ambient pressure). Thus, we can assume that the LTHBr crystal has undergone a structural phase transition and a conformational phase transition in the pressure range investigated.
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Affiliation(s)
- C A A S Santos
- Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA 65900-410, Brazil; Centro de Ciências Humanas Sociais Tecnologias e Letras, Universidade Estadual da Região Tocantina do Maranhão, Açailândia, MA 65930-000, Brazil; Núcleo de Engenharias - Faculdade de Imperatriz, Imperatriz, MA 65900-120, Brazil.
| | - R J C Lima
- Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA 65900-410, Brazil
| | - W Paraguassu
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém, PA 66075-110, Brazil
| | - J G da Silva Filho
- Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA 65900-410, Brazil
| | - A O Dos Santos
- Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA 65900-410, Brazil
| | - J A Lima
- Departamento de Física, Universidade Federal do Ceará, Fortaleza, CE 60455-760, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, Fortaleza, CE 60455-760, Brazil
| | - P F Façanha Filho
- Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA 65900-410, Brazil
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7
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Gomes EJ, Lima JA, Freire PTC, Pinheiro GS, de Sousa FF, Remédios CMR. Effect of Fe (III) on L-asparagine monohydrate investigated under low- and high-temperature conditions. Spectrochim Acta A Mol Biomol Spectrosc 2020; 241:118643. [PMID: 32682278 DOI: 10.1016/j.saa.2020.118643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 06/17/2020] [Accepted: 06/21/2020] [Indexed: 06/11/2023]
Abstract
Raman spectra of Fe-doped L-asparagine monohydrate (LAM:Fe) crystal were studied under several temperatures varying from 17 to 490 K. The effect of Fe (III) ion on the stability of the crystal in changing temperature through the vibrational spectra was discussed. The behavior of inter and intra-molecular vibration modes has indicated two phase transitions and an amorphous transformation. These effects were also clarified by X-ray powder diffraction measurements which corroborate very well the Raman data. In addition, we have determinated the lattice parameters of all phases and verified that under low temperature conditions the crystal undergoes a conformational transition whereas under high temperatures its structure transforms from the orthorhombic (P212121-space group) to the monoclinic (P21-space group) symmetry and, after this process, it goes to an amorphous phase due to the start of the decomposition. Finally, differential scanning calorimetry analysis was utilized as complementary technique to investigate the structural stability of LAM:Fe and results are in a good agreement with the Raman and the X-ray diffraction data.
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Affiliation(s)
- E J Gomes
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil
| | - J A Lima
- Departamento de Física, Universidade Federal do Ceará, P.O. Box 6030, Fortaleza, CE, 60455-900, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, P.O. Box 6030, Fortaleza, CE, 60455-900, Brazil
| | - G S Pinheiro
- Departamento de Física, Campus Ministro Petrônio Portella, Bloco 03, Universidade Federal do Piauí, CEP 64049-550 Teresina, PI, Brazil
| | - F F de Sousa
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil
| | - C M R Remédios
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil.
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8
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Saraiva GD, Paraguassu W, de Castro AJR, de Sousa FF, da Silva Filho JG, Neto VOS, Lima JA, Teixeira AMR, Freire PTC. Lattice dynamics calculations and high-pressure Raman spectra of the ZnMoO 4. Spectrochim Acta A Mol Biomol Spectrosc 2020; 239:118501. [PMID: 32473562 DOI: 10.1016/j.saa.2020.118501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 05/16/2020] [Accepted: 05/17/2020] [Indexed: 06/11/2023]
Abstract
We report here the analysis of vibrational properties of the ZnMoO4 by using theoretical and experimental approaches, well as results of high pressure experiments in this system. The analysis of the lattice dynamics calculations through the classical rigid ion model, was applied to determine the mode assignment in the triclinic phase of the ZnMoO4. Additionally, the experimental high-pressure Raman spectra of the ZnMoO4 were carried out from 0 GPa up to 6.83 GPa to shed light on the structural stability of this system. The pressure-dependent studies showed that this crystal undergoes a first order phase transition at around 1.05 GPa. The Raman spectrum analysis of the new phase shows a significant change in the number of modes for the spectral range of 20-1000 cm-1. The instability of this phase occurs due to the decrease of the MoO bond lengths in the high-pressure phase, connected with tilting and/or rotations of the MoO4 tetrahedra leading to a disorder at the MoO4 sites. The second and third phase transformations were observed, respectively, at about 2.9 GPa and 4.77 GPa, with strong evidences, in the Raman spectra, of crystal symmetry change. The principal component analysis (PCA) and the hierarchical cluster analysis (HCA) were used in order to infer the intervals of pressure where the different phases do exist. Discussion about the number of non equivalent sites for Mo ions and the kind of coordination for molybdenum atoms is also furnished.
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Affiliation(s)
- G D Saraiva
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.902-098 Quixadá, CE, Brazil.
| | - W Paraguassu
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil
| | - A J Ramiro de Castro
- Universidade Federal do Ceará, P. O. Box 6030, CEP 63.902-580 Quixadá, CE, Brazil
| | - F F de Sousa
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil
| | - J G da Silva Filho
- Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA, 65900-410, Brazil
| | - V O Sousa Neto
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.902-098 Quixadá, CE, Brazil
| | - J A Lima
- Departamento de Física, Universidade Federal do Ceará, P. O. Box 6030, CEP 60.455-970 Fortaleza, CE, Brazil
| | - A M R Teixeira
- Departamento de Física, Universidade Regional do Cariri, Juazeiro do Norte, CE 63040-000, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, P. O. Box 6030, CEP 60.455-970 Fortaleza, CE, Brazil
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9
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de Oliveira CS, de Matos HJ, Ramos FLDP, Pinto AYDN, Graim PNDS, Guimarães VDPR, Gomes LTS, Serra EMF, Cruz AC, Leal A, Henriques DF, Lima JA, Anjos MV, Pinto EV, de Souza AW, Vasconcelos PFDC. Risk of Zika virus-associated birth defects in congenital confirmed cases in the Brazilian Amazon. Rev Panam Salud Publica 2020; 44:e116. [PMID: 32952536 PMCID: PMC7491861 DOI: 10.26633/rpsp.2020.116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 06/02/2020] [Indexed: 01/08/2023] Open
Abstract
Objective To establish the risk of microcephaly in neonates born to women infected with ZIKV during pregnancy. Methods A cohort of laboratory-confirmed ZIKV cases of congenital infections (109 mothers infected during pregnancy and 101 newborns) among 308 suspect cases was followed in Belem, Pará, Brazil, from October 2015 to December 2017. Results A microcephaly risk of 1.98% (95% CI 0.54-6.93%) was found, or 2 cases among the 101 neonates infected with ZIKV during pregnancy. 72% of the pregnant women had ZIKV infection confirmed by RT-qPCR during gestation. Conclusions Results showed a low incidence of ZIKV-associated birth defects, stillbirth, and miscarriage, which contrasts with previous studies in other Brazilian regions. Previous exposure to yellow fever vaccine and/or multiserotype DENV infection could be implicated in the protection from ZIKV congenital infection.
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Affiliation(s)
| | - Haroldo José de Matos
- Instituto Evandro Chagas Ananindeua Brazil Instituto Evandro Chagas, Ananindeua, Brazil
| | | | - Ana Yece das N Pinto
- Instituto Evandro Chagas Ananindeua Brazil Instituto Evandro Chagas, Ananindeua, Brazil
| | | | | | - Luna Thaís S Gomes
- Instituto Evandro Chagas Ananindeua Brazil Instituto Evandro Chagas, Ananindeua, Brazil
| | - Emilene M F Serra
- Instituto Evandro Chagas Ananindeua Brazil Instituto Evandro Chagas, Ananindeua, Brazil
| | - Ana Cecília Cruz
- Instituto Evandro Chagas Ananindeua Brazil Instituto Evandro Chagas, Ananindeua, Brazil
| | - Alessandra Leal
- Instituto Evandro Chagas Ananindeua Brazil Instituto Evandro Chagas, Ananindeua, Brazil
| | - Daniele F Henriques
- Instituto Evandro Chagas Ananindeua Brazil Instituto Evandro Chagas, Ananindeua, Brazil
| | - Juliana A Lima
- Instituto Evandro Chagas Ananindeua Brazil Instituto Evandro Chagas, Ananindeua, Brazil
| | - Maura V Anjos
- Instituto Evandro Chagas Ananindeua Brazil Instituto Evandro Chagas, Ananindeua, Brazil
| | - Eliana V Pinto
- Instituto Evandro Chagas Ananindeua Brazil Instituto Evandro Chagas, Ananindeua, Brazil
| | - Alana W de Souza
- Instituto Evandro Chagas Ananindeua Brazil Instituto Evandro Chagas, Ananindeua, Brazil
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10
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Victor FMS, Rêgo FSC, de Paiva FM, Dos Santos AO, Polian A, Freire PTC, Lima JA, Filho PFF. Pressure-induced phase transitions in DL-glutamic acid monohydrate crystal. Spectrochim Acta A Mol Biomol Spectrosc 2020; 230:118059. [PMID: 32000059 DOI: 10.1016/j.saa.2020.118059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 01/06/2020] [Accepted: 01/09/2020] [Indexed: 06/10/2023]
Abstract
DL-glutamic acid monohydrate crystal was synthesized from an aqueous solution by slow evaporation technique. The crystal was submitted to high-pressure (1 atm-14.3 GPa) to investigate its vibrational behavior and the occurrence of phase transitions. We performed Raman spectroscopy as probe and through the analysis of the spectra we discovered three structural phase transitions. The first one occurs around 0.9 GPa. In this phase transition, glutamic acid molecules suffer modifications in their conformations while water molecules are less affected. The second phase transition at 4.8 GPa involves conformational changes related to CO2-, NH3+ units and the water molecules, while the third one, between 10.9 and 12.4 GPa, involves motions of several parts of the glutamic acid as well as the water molecules. Considering the dynamic of high pressure, the second phase of DL-glutamic acid monohydrate crystal presented a better stability compared with the second phase of its polymorphs α and β L-glutamic acid. In addition, water molecules seem to play important role on this structural stability. All changes are reversible.
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Affiliation(s)
- F M S Victor
- Universidade Federal do Maranhão, CCSST, Imperatriz, MA 65900-000, Brazil
| | - F S C Rêgo
- Departamento de Física, Universidade Federal do Ceará, Campus do Pici, Fortaleza, CE 60455-760, Brazil
| | - F M de Paiva
- Departamento de Física, Universidade Federal do Ceará, Campus do Pici, Fortaleza, CE 60455-760, Brazil; Faculdade de Educação, Ciências e Letras de Iguatu, FECLI, Universidade Estadual do Ceará, Iguatu, CE 63502-253, Brazil
| | - A O Dos Santos
- Universidade Federal do Maranhão, CCSST, Imperatriz, MA 65900-000, Brazil
| | - A Polian
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Sorbonne Université, UMR CNRS 7590, F-75005 Paris, France
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, Campus do Pici, Fortaleza, CE 60455-760, Brazil
| | - J A Lima
- Departamento de Física, Universidade Federal do Ceará, Campus do Pici, Fortaleza, CE 60455-760, Brazil
| | - P F Façanha Filho
- Universidade Federal do Maranhão, CCSST, Imperatriz, MA 65900-000, Brazil.
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11
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Robbiani DF, Olsen PC, Costa F, Wang Q, Oliveira TY, Nery N, Aromolaran A, do Rosário MS, Sacramento GA, Cruz JS, Khouri R, Wunder EA, Mattos A, de Paula Freitas B, Sarno M, Archanjo G, Daltro D, Carvalho GBS, Pimentel K, de Siqueira IC, de Almeida JRM, Henriques DF, Lima JA, Vasconcelos PFC, Schaefer-Babajew D, Azzopardi SA, Bozzacco L, Gazumyan A, Belfort R, Alcântara AP, Carvalho G, Moreira L, Araujo K, Reis MG, Keesler RI, Coffey LL, Tisoncik-Go J, Gale M, Rajagopal L, Adams Waldorf KM, Dudley DM, Simmons HA, Mejia A, O'Connor DH, Steinbach RJ, Haese N, Smith J, Lewis A, Colgin L, Roberts V, Frias A, Kelleher M, Hirsch A, Streblow DN, Rice CM, MacDonald MR, de Almeida ARP, Van Rompay KKA, Ko AI, Nussenzweig MC. Risk of Zika microcephaly correlates with features of maternal antibodies. J Exp Med 2019; 216:2302-2315. [PMID: 31413072 PMCID: PMC6781003 DOI: 10.1084/jem.20191061] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 07/15/2019] [Accepted: 07/16/2019] [Indexed: 01/15/2023] Open
Abstract
Zika virus (ZIKV) infection during pregnancy causes congenital abnormalities, including microcephaly. However, rates vary widely, and the contributing risk factors remain unclear. We examined the serum antibody response to ZIKV and other flaviviruses in Brazilian women giving birth during the 2015-2016 outbreak. Infected pregnancies with intermediate or higher ZIKV antibody enhancement titers were at increased risk to give birth to microcephalic infants compared with those with lower titers (P < 0.0001). Similarly, analysis of ZIKV-infected pregnant macaques revealed that fetal brain damage was more frequent in mothers with higher enhancement titers. Thus, features of the maternal antibodies are associated with and may contribute to the genesis of ZIKV-associated microcephaly.
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Affiliation(s)
- Davide F Robbiani
- Laboratory of Molecular Immunology, The Rockefeller University, New York, NY
| | - Priscilla C Olsen
- Laboratory of Molecular Immunology, The Rockefeller University, New York, NY
- Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Federico Costa
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT
- Faculdade de Medicina and Instituto da Saúde Coletiva, Universidade Federal da Bahia, Salvador, Bahia, Brazil
| | - Qiao Wang
- Key Laboratory of Medical Molecular Virology (MOE/NHC/CAMS), School of Basic Medical Sciences, Shanghai Medical College, Fudan University, Shanghai, China
| | - Thiago Y Oliveira
- Laboratory of Molecular Immunology, The Rockefeller University, New York, NY
| | - Nivison Nery
- Instituto Gonçalo Moniz, Fundação Oswaldo Cruz/MS, Salvador, Bahia, Brazil
| | - Adeolu Aromolaran
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT
| | - Mateus S do Rosário
- Hospital Geral Roberto Santos, Secretária da Saúde do Estado da Bahia, Salvador, Brazil
| | | | - Jaqueline S Cruz
- Instituto Gonçalo Moniz, Fundação Oswaldo Cruz/MS, Salvador, Bahia, Brazil
| | - Ricardo Khouri
- Instituto Gonçalo Moniz, Fundação Oswaldo Cruz/MS, Salvador, Bahia, Brazil
| | - Elsio A Wunder
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT
| | - Adriana Mattos
- Hospital Geral Roberto Santos, Secretária da Saúde do Estado da Bahia, Salvador, Brazil
| | - Bruno de Paula Freitas
- Hospital Geral Roberto Santos, Secretária da Saúde do Estado da Bahia, Salvador, Brazil
- Universidade Federal de São Paulo, São Paulo, Brazil
| | - Manoel Sarno
- Faculdade de Medicina and Instituto da Saúde Coletiva, Universidade Federal da Bahia, Salvador, Bahia, Brazil
| | - Gracinda Archanjo
- Hospital Geral Roberto Santos, Secretária da Saúde do Estado da Bahia, Salvador, Brazil
| | - Dina Daltro
- Hospital Geral Roberto Santos, Secretária da Saúde do Estado da Bahia, Salvador, Brazil
| | - Gustavo B S Carvalho
- Hospital Geral Roberto Santos, Secretária da Saúde do Estado da Bahia, Salvador, Brazil
| | - Kleber Pimentel
- Hospital Geral Roberto Santos, Secretária da Saúde do Estado da Bahia, Salvador, Brazil
| | | | - João R M de Almeida
- Faculdade de Medicina and Instituto da Saúde Coletiva, Universidade Federal da Bahia, Salvador, Bahia, Brazil
| | | | - Juliana A Lima
- Instituto Evandro Chagas, Ministério da Saúde Ananindeua, Pará, Brazil
| | | | | | - Stephanie A Azzopardi
- Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, NY
| | - Leonia Bozzacco
- Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, NY
| | - Anna Gazumyan
- Laboratory of Molecular Immunology, The Rockefeller University, New York, NY
| | | | | | | | | | | | - Mitermayer G Reis
- Instituto Gonçalo Moniz, Fundação Oswaldo Cruz/MS, Salvador, Bahia, Brazil
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT
- Faculdade de Medicina and Instituto da Saúde Coletiva, Universidade Federal da Bahia, Salvador, Bahia, Brazil
| | - Rebekah I Keesler
- California National Primate Research Center, University of California, Davis, Davis, CA
| | - Lark L Coffey
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, CA
| | - Jennifer Tisoncik-Go
- Washington National Primate Research Center, Seattle, WA
- Center for Innate Immunity and Immune Disease, University of Washington, Seattle, WA
- Department of Immunology, University of Washington, Seattle, WA
| | - Michael Gale
- Washington National Primate Research Center, Seattle, WA
- Center for Innate Immunity and Immune Disease, University of Washington, Seattle, WA
- Department of Immunology, University of Washington, Seattle, WA
- Department of Global Health, University of Washington, Seattle, WA
| | - Lakshmi Rajagopal
- Department of Global Health, University of Washington, Seattle, WA
- Department of Pediatrics, University of Washington, Seattle, WA
- Center for Global Infectious Disease Research, Seattle Children's Research Institute, Seattle, WA
| | - Kristina M Adams Waldorf
- Washington National Primate Research Center, Seattle, WA
- Center for Innate Immunity and Immune Disease, University of Washington, Seattle, WA
- Department of Global Health, University of Washington, Seattle, WA
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA
| | - Dawn M Dudley
- Department of Pathology and Laboratory Medicine, University of Wisconsin-Madison, Madison, WI
| | - Heather A Simmons
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, WI
| | - Andres Mejia
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, WI
| | - David H O'Connor
- Department of Pathology and Laboratory Medicine, University of Wisconsin-Madison, Madison, WI
| | - Rosemary J Steinbach
- Division of Reproductive and Developmental Sciences, Oregon National Primate Research Center, Beaverton, OR
| | - Nicole Haese
- Division of Pathobiology and Immunology, Oregon National Primate Research Center, Beaverton, OR
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, OR
| | - Jessica Smith
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, OR
| | - Anne Lewis
- Pathology Services Unit, Division of Comparative Medicine, Oregon National Primate Research Center, Beaverton, OR
| | - Lois Colgin
- Division of Pathobiology and Immunology, Oregon National Primate Research Center, Beaverton, OR
| | - Victoria Roberts
- Division of Reproductive and Developmental Sciences, Oregon National Primate Research Center, Beaverton, OR
| | - Antonio Frias
- Division of Reproductive and Developmental Sciences, Oregon National Primate Research Center, Beaverton, OR
- Department of Obstetrics and Gynecology, Oregon Health and Science University, Portland, OR
| | - Meredith Kelleher
- Division of Reproductive and Developmental Sciences, Oregon National Primate Research Center, Beaverton, OR
| | - Alec Hirsch
- Division of Pathobiology and Immunology, Oregon National Primate Research Center, Beaverton, OR
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, OR
| | - Daniel N Streblow
- Division of Pathobiology and Immunology, Oregon National Primate Research Center, Beaverton, OR
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, OR
| | - Charles M Rice
- Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, NY
| | - Margaret R MacDonald
- Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, NY
| | - Antonio R P de Almeida
- Faculdade de Medicina and Instituto da Saúde Coletiva, Universidade Federal da Bahia, Salvador, Bahia, Brazil
| | - Koen K A Van Rompay
- California National Primate Research Center, University of California, Davis, Davis, CA
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, CA
| | - Albert I Ko
- Instituto Gonçalo Moniz, Fundação Oswaldo Cruz/MS, Salvador, Bahia, Brazil
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT
| | - Michel C Nussenzweig
- Laboratory of Molecular Immunology, The Rockefeller University, New York, NY
- Howard Hughes Medical Institute, The Rockefeller University, New York, NY
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12
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Rêgo FSC, Melo FEA, Nogueira CES, Polian A, Freire PTC, Filho PFF, Lima JA. High pressure Raman scattering of DL‑isoleucine crystals and DFT calculations. Spectrochim Acta A Mol Biomol Spectrosc 2019; 214:207-215. [PMID: 30785040 DOI: 10.1016/j.saa.2019.01.087] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 01/28/2019] [Accepted: 01/29/2019] [Indexed: 06/09/2023]
Abstract
DL‑isoleucine single crystals were grown by the slow evaporation method at ambient temperature. Their vibrational properties were studied at ambient temperature as a function of pressure by Raman scattering. At ambient conditions the mode assignment was done in terms of the Potential Energy Distribution (PED) through density functional theory calculations. Both nitrogen and neon were used as pressure transmitting media. The pressure-dependent investigation shows modifications in the Raman spectra recorded between 30 and 3200 cm-1 that were interpreted as phase transitions undergone by the crystal between 1.3 and 1.9 GPa and between 3.6 and 5.1 GPa. Finally, stress was simulated on the unit cell of the crystal from ambient up to 5.0 GPa.
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Affiliation(s)
- F S C Rêgo
- Departamento de Física, Universidade Federal do Ceará, C. P. 6030, CEP 60455-760 Fortaleza, CE, Brazil
| | - F E A Melo
- Departamento de Física, Universidade Federal do Ceará, C. P. 6030, CEP 60455-760 Fortaleza, CE, Brazil
| | - C E S Nogueira
- Departamento de Física, Universidade Regional do Cariri, CEP 63010-970 Juazeiro do Norte, CE, Brazil
| | - A Polian
- Institut de Minéralogie de Physique des Matériaux et de Cosmochimie, Sorbonne Université - UPMC Univ Paris 06, UMR CNRS 7590, F-75005 Paris, France
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, C. P. 6030, CEP 60455-760 Fortaleza, CE, Brazil
| | - P F Façanha Filho
- Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA 65900-410, Brazil
| | - J A Lima
- Departamento de Física, Universidade Federal do Ceará, C. P. 6030, CEP 60455-760 Fortaleza, CE, Brazil.
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13
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Maia JR, Lima JA, Freire PTC, Melo FEA, de Menezes AS, Remédios CMR, Cardoso LP. High pressure studies on bis(l-histidinate)nickel(II) monohydrate. Spectrochim Acta A Mol Biomol Spectrosc 2018; 189:258-264. [PMID: 28823966 DOI: 10.1016/j.saa.2017.08.040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Revised: 08/10/2017] [Accepted: 08/13/2017] [Indexed: 06/07/2023]
Abstract
Raman spectra of bis(l-histidinate)nickel(II) monohydrate crystal were obtained for pressures up to 9.5GPa. Our results show the disappearance of some of the Raman modes and the appearance of other modes. These modifications evidence that the sample undergoes phase transitions at around 0.8 and 3.2GPa. The role played by the Ni ions and hydrogen bonds in the dynamics of the phase transitions is discussed. Under decompression, down to atmospheric pressure, the original Raman spectra are recovered, showing that both phase transitions are fully reversible.
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Affiliation(s)
- J R Maia
- Faculdade de Filosofia Dom Aureliano Mattos, Universidade Estadual do Ceará, CEP 63.900-000 Limoeiro do Norte, CE, Brazil
| | - J A Lima
- Departamento de Física, Universidade Federal do Ceará, C.P. 6030, Campus do Pici, 60440-970 Fortaleza, CE, Brazil.
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, C.P. 6030, Campus do Pici, 60440-970 Fortaleza, CE, Brazil
| | - F E A Melo
- Departamento de Física, Universidade Federal do Ceará, C.P. 6030, Campus do Pici, 60440-970 Fortaleza, CE, Brazil
| | - A S de Menezes
- Departamento de Física, CCET, Universidade Federal do Maranhão, Centro Tecnológico, CEP 65085-580 São Luís, MA, Brazil
| | - C M R Remédios
- Instituto de Ciencias Exatas e Naturais, Universidade Federal do Pará, CEP66075-110 Belém, PA, Brazil
| | - L P Cardoso
- Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, CEP 13083-859 Campinas, SP, Brazil
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14
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Laguna JG, Cardoso MS, Lima JA, Reis RB, Carvalho AU, Saturnino HM, Teixeira SMR. Expression of hepatic genes related to energy metabolism during the transition period of Holstein and F 1 Holstein-Gir cows. J Dairy Sci 2017; 100:9861-9870. [PMID: 28964523 DOI: 10.3168/jds.2016-12459] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 08/11/2017] [Indexed: 11/19/2022]
Abstract
The aim of this study was to investigate the expression of genes encoding enzymes and other factors involved with carbohydrate and lipid metabolism in the liver of 2 genetic groups of dairy cows during the transition period. We analyzed the expression of glucose-6-phosphatase (G6PC), cytosolic phosphoenolpyruvate carboxykinase (PEPCK-C), methylmalonyl-CoA mutase (MUT), β-hydroxybutyrate dehydrogenase-2 (BDH2), acetyl-CoA carboxylase (ACC), carnitine palmitoyltransferase-2 (CPT2), 3-hydroxy-3-methylglutaryl-CoA reductase (HMGCR), glucose transporter-2 (SLC2A2), and the transcription factor peroxisome proliferator-activated receptor α (PPARA). Blood concentrations of glucose, nonesterified fatty acids, and β-hydroxybutyrate were also determined. Liver biopsies and blood samples were taken at d 15 prepartum and at d 6, 21, 36, 51, and 66 postpartum from Holsteins (n = 6) and F1 Holstein-Gir (n = 6) cows. Cows were kept under the same prepartum and postpartum management conditions. The results showed that the expression of G6PC, PEPCK-C, BDH2, ACC, CPT2, HMGCR, SLC2A2, and PPARA genes did not differ between genetic groups. Except for PEPCK-C, no interaction between genetic groups and the experimental period was observed. Within both groups of cows, G6PC and PEPCK-C gene expression decreased when comparing prepartum gene expression with 21 and 36 DIM, and increased in d 51 postpartum. MUT mRNA levels differed between the 2 genetic groups and displayed a significant increase after d 36 postpartum, whereas mRNA levels of HMGCR tended to increase when comparing d 21 and 36 to d 51 postpartum. Glucose concentrations also differed between genetic groups, being significantly higher in the plasma of F1 Holstein-Gir cows than in Holstein cows, but no differences were found within each group during the analysis period. β-Hydroxybutyrate and nonesterified fatty acid concentrations did not differ between genetic groups, but displayed increased levels from prepartum to d 6 and 21 postpartum. Our results indicated that expression in the liver of genes involved with glucose and fatty acid metabolism were similar in both groups of cows and significant differences were observed between the 2 groups in the expression of MUT, a gene involved in propionate metabolism.
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Affiliation(s)
- J G Laguna
- Department of Animal Science, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, 30161-970, Brazil
| | - M S Cardoso
- Department of Parasitology, UFMG, Belo Horizonte, 31270-901, Brazil
| | - J A Lima
- Department of Animal Science, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, 30161-970, Brazil
| | - R B Reis
- Department of Animal Science, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, 30161-970, Brazil
| | - A U Carvalho
- Department of Clinical and Surgery, UFMG, Belo Horizonte, 30161-970, Brazil
| | - H M Saturnino
- Department of Animal Science, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, 30161-970, Brazil.
| | - S M R Teixeira
- Biochemistry and Immunology Department, UFMG, Belo Horizonte, 31270-901, Brazil.
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15
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Saraiva GD, Maia JR, Lima JA, Nogueira CES, Freire PTC, de Sousa FF, Teixeira AMR, Mendes Filho J. Pressure induced transformations in sorbic acid. Spectrochim Acta A Mol Biomol Spectrosc 2017; 184:327-334. [PMID: 28528253 DOI: 10.1016/j.saa.2017.05.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 04/18/2017] [Accepted: 05/09/2017] [Indexed: 06/07/2023]
Abstract
This research reports a pressure dependent Raman study of the sorbic acid between 0.0 and 10.0GPa. The unpolarized Raman spectra were measured in the spectral range of 20-3000cm-1. The high-pressure Raman scattering study of the sorbic acid showed that it underwent a gradual, disordering process. At the room temperature and at the ambient pressure conditions, the crystal structure of the sorbic acid belongs to the monoclinic system with a C2/c (C2h6) space group. The pressure increase induced a higher disorder in the monoclinic unit cell, since a single bending mode, and only very broad stretching Raman modes are present at pressure of ~10GPa. Upon pressure release the high-pressure phase transforms directly into the ambient-pressure phase. The presence of the internal vibrational modes is a guarantee that the molecular structure is maintained. Beyond this, the presence of external modes shows that the crystal has a memory to reverse the process and suggest that the crystal, which was in high disorder (broad Raman bands), does not suffer decomposition in the crystalline structure. The DFT calculations for the sorbic acid were performed in order to understand the vibrational properties. The theoretical study showed that the volume of the unit cell and beta angle decrease significatively when passing from the 0.0GPa to 8.0GPa. The decreases in the volume and beta angle of this particular unit cell were supposed to induce the larger increase in the bandwidths of the observed bands, pointing to some disorder in the monoclinic phase.
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Affiliation(s)
- G D Saraiva
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.900-000, Quixadá, CE, Brazil.
| | - J R Maia
- Faculdade de Filosofia Dom Aureliano Mattos, Universidade Estadual do Ceará, CEP 63.900-000, Limoeiro do Norte, CE, Brazil
| | - J A Lima
- Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, CEP 60455-760, Fortaleza-CE, Brazil
| | - C E S Nogueira
- Departamento de Física, Universidade Regional do Cariri, Juazeiro do Norte - CE, CEP 63040-005, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, CEP 60455-760, Fortaleza-CE, Brazil
| | - F F de Sousa
- Instituto de Ciências Exatas, Universidade Federal do Sul e Sudeste do Pará, CEP 68.505-080, Marabá, PA, Brazil
| | - A M R Teixeira
- Departamento de Física, Universidade Regional do Cariri, Juazeiro do Norte - CE, CEP 63040-005, Brazil
| | - J Mendes Filho
- Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, CEP 60455-760, Fortaleza-CE, Brazil
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Pinheiro GS, Ferreira Júnior MNG, Dos Santos AO, Freire PTC, Lima JA, Nogueira CES, Cardoso LP, Sherwood JN, Remédios CMR. Low-temperature Raman spectra of the 2-(α-methylbenzylamino)-5-nitropyridine crystal. Spectrochim Acta A Mol Biomol Spectrosc 2017; 183:209-217. [PMID: 28454073 DOI: 10.1016/j.saa.2017.04.055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2016] [Revised: 03/25/2017] [Accepted: 04/18/2017] [Indexed: 06/07/2023]
Abstract
The polar organic 2-(α-methylbenzylamino)-5-nitropyridine crystal (MBANP) has been studied by Raman spectroscopy at low temperatures (from 300 to 10K). The effect of temperature change on the vibrational spectrum is discussed with the aid of DFT calculations. The behavior of the Raman spectra indicates that MBANP molecules present a different conformation at low temperatures associated with the rotation of the phenyl and pyridine rings. Temperature-dependent X-ray measurements and differential scanning calorimetry (DSC) analysis were utilized as complementary techniques to investigate the structural stability of MBANP crystal.
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Affiliation(s)
- G S Pinheiro
- Departamento de Física, Campus Ministro Petrônio Portella, Universidade Federal do Piauí, CEP 64049-550 Teresina, PI, Brazil.
| | - M N G Ferreira Júnior
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 60740-000 Belém, PA, Brazil
| | - A O Dos Santos
- Centro de Ciências Sociais Saúde e Tecnologia, Universidade Federal do Maranhão, CEP 65900-410 Imperatriz, MA, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, CEP 60455-900 Fortaleza, CE, Brazil
| | - J A Lima
- Departamento de Física, Universidade Federal do Ceará, CEP 60455-900 Fortaleza, CE, Brazil
| | - C E S Nogueira
- Departamento de Física, Universidade Regional do Cariri, CEP 63010-970 Juazeiro do Norte, CE, Brazil
| | - L P Cardoso
- Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, CEP 13083-859 Campinas, SP, Brazil
| | - J N Sherwood
- WESTCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, Scotland
| | - C M R Remédios
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 60740-000 Belém, PA, Brazil
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Azevedo RSS, Araujo MT, Martins Filho AJ, Oliveira CS, Nunes BTD, Cruz ACR, Nascimento AGPAC, Medeiros RC, Caldas CAM, Araujo FC, Quaresma JAS, Vasconcelos BCB, Queiroz MGL, da Rosa EST, Henriques DF, Silva EVP, Chiang JO, Martins LC, Medeiros DBA, Lima JA, Nunes MRT, Cardoso JF, Silva SP, Shi PY, Tesh RB, Rodrigues SG, Vasconcelos PFC. Zika virus epidemic in Brazil. I. Fatal disease in adults: Clinical and laboratorial aspects. J Clin Virol 2016; 85:56-64. [PMID: 27835759 DOI: 10.1016/j.jcv.2016.10.024] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 10/26/2016] [Accepted: 10/31/2016] [Indexed: 11/29/2022]
Abstract
BACKGROUND Zika virus (ZIKV) was first detected in Brazil in May 2015 and the country experienced an explosive epidemic. However, recent studies indicate that the introduction of ZIKV occurred in late 2013. Cases of microcephaly and deaths associated with ZIKV infection were identified in Brazil in November, 2015. OBJECTIVES To determine the etiology of three fatal adult cases. STUDY DESIGN Here we report three fatal adult cases of ZIKV disease. ZIKV infection in these patients was confirmed by cells culture and/or real-time reverse transcriptase polymerase chain reaction (RT-qPCR) and by antigen detection using immunohistochemical assay. Samples of brain and other selected organs taken at autopsy from three patients were also analyzed by histopathological and immunohistological examination. RESULTS The first patient, a 36-year-old man with lupus and receiving prednisone therapy, developed a fulminant ZIKV infection. At autopsy, RT-qPCR of blood and tissues was positive for ZIKV RNA, and the virus was cultured from an organ homogenate. The second patient, a previously healthy female, 16 years of age, presented classic symptoms of Zika fever, but later developed severe thrombocytopenia, anemia and hemorrhagic manifestations and died. A blood sample taken on the seventh day of her illness was positive RT-PCR for ZIKV RNA and research in the serum was positive for antinuclear factor fine speckled (1/640), suggesting Evans syndrome (hemolytic anemia an autoimmune disorder with immune thrombocytopenic purpura) secondary to ZIKV infection. The third patient was a 20-year-old woman hospitalized with fever, pneumonia and hemorrhages, who died on 13days after admission. Histopathological changes were observed in all viscera examined. ZIKV antigens were detected by immunohistochemistry in viscera specimens of patients 1 and 3. These three cases demonstrate other potential complications of ZIKV infection, in addition to microcephaly and Guillain-Barre syndrome (GBS), and they suggest that individuals with immune suppression and/or autoimmune disorders may be at higher risk of developing severe disease, if infected with ZIKV.
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Affiliation(s)
- Raimunda S S Azevedo
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil; Programa de Pós-graduação em Virologia (PPGV) do Instituto Evandro Chagas, Ananindeua, Pará, Brazil.
| | - Marialva T Araujo
- Seção de Patologia, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil.
| | - Arnaldo J Martins Filho
- Seção de Patologia, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil.
| | - Consuelo S Oliveira
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil.
| | - Bruno T D Nunes
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil.
| | - Ana C R Cruz
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil; Departamento de Patologia, Universidade do Estado do Pará, Belém, Pará, Brazil.
| | | | - Rita C Medeiros
- Hospital Universitário João de Barros Barreto, Universidade Federal do Pará, Belém, Pará, Brazil.
| | - Cezar A M Caldas
- Hospital Universitário João de Barros Barreto, Universidade Federal do Pará, Belém, Pará, Brazil.
| | - Fernando C Araujo
- Hospital Universitário João de Barros Barreto, Universidade Federal do Pará, Belém, Pará, Brazil.
| | - Juarez A S Quaresma
- Departamento de Patologia, Universidade do Estado do Pará, Belém, Pará, Brazil.
| | | | - Maria G L Queiroz
- Laboratório Central, Secretaria de Saúde Pública do Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil.
| | - Elizabeth S Travassos da Rosa
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil.
| | - Daniele F Henriques
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil.
| | - Eliana V P Silva
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil.
| | - Jannifer O Chiang
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil.
| | - Lívia C Martins
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil.
| | - Daniele B A Medeiros
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil.
| | - Juliana A Lima
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil.
| | - Márcio R T Nunes
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil.
| | - Jedson F Cardoso
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil; Programa de Pós-graduação em Virologia (PPGV) do Instituto Evandro Chagas, Ananindeua, Pará, Brazil.
| | - Sandro P Silva
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil.
| | - Pei-Yong Shi
- Department of Pathology, University of Texas Medical Branch, Galveston, TX, USA.
| | - Robert B Tesh
- Department of Pathology, University of Texas Medical Branch, Galveston, TX, USA.
| | - Sueli G Rodrigues
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil.
| | - Pedro F C Vasconcelos
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Pará, Brazil; Departamento de Patologia, Universidade do Estado do Pará, Belém, Pará, Brazil.
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Sanchez OA, Duprez DA, Bahrami H, Peralta CA, Daniels LB, Lima JA, Maisel A, Folsom AR, Jacobs DR. Changes in N-terminal pro-B-type natriuretic peptide and incidence of diabetes: The Multi-Ethnic Study of Atherosclerosis (MESA). Diabetes Metab 2015; 41:378-86. [PMID: 26047677 DOI: 10.1016/j.diabet.2015.04.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Revised: 04/03/2015] [Accepted: 04/27/2015] [Indexed: 10/23/2022]
Abstract
AIMS This study looked at whether the inverse association of circulating N-terminal pro-B-type natriuretic peptide (NT-proBNP) with incident diabetes is modified by changes in NT-proBNP (ΔNT-proBNP) levels. METHODS Plasma NT-proBNP was assayed at baseline and 3.2 years later (visit 3) in the Multi-Ethnic Study of Atherosclerosis (MESA). ΔNT-proBNP was calculated as NT-proBNP visit3-NT-proBNP baseline. A Poisson distribution was fitted to determine the incidence density of diabetes, adjusted for age, race, gender, educational attainment, antihypertensive medication, total intentional exercise and plasma IL-6 levels. In the primary analysis (n=3236 without diabetes up to visit 3, followed for a mean of 6.3 years), incidence density was regressed for the following categories of baseline NT-proBNP: (1)<54.4 pg/mL; (2) 54.4-85.9 pg/mL; and (3) 86-54.2 pg/mL. This was crossed with categories of ΔNT-proBNP as medians (ranges): (1) -6.2 (-131-11.7) pg/mL; (2) 19.8 (11.8-30.1) pg/mL; (3) 44.0 (30.2-67.9) pg/mL; and (4) 111.2 (68.0-3749.9) pg/mL. RESULTS The incidence density of diabetes followed a U-shaped association across categories of ΔNT-proBNP within categories of baseline NT-proBNP after adjusting for other covariates (P=0.02). At each level of baseline NT-proBNP, the incidence density of diabetes was lowest for small-to-moderate increases in NT-proBNP. CONCLUSION This analysis suggests that NT-proBNP has a biphasic association with diabetes in which the risk of incident diabetes decreases within a 'physiological range' of ΔNT-proBNP, and plateaus or increases as NT-proBNP concentrations increase, probably in response to pathophysiological conditions leading to high levels of NT-proBNP.
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Affiliation(s)
- O A Sanchez
- School of Public Health, Division of Epidemiology & Community Health, University of Minnesota, West Bank Office Building 1300 South, Second Street, Suite 300, 55454-1015 Minneapolis, United States.
| | - D A Duprez
- Division of Cardiology, University of Minnesota, United States
| | | | - C A Peralta
- School of Medicine, University of California San Francisco, United States
| | - L B Daniels
- Division of Cardiology, University of California, San Diego, United States
| | - J A Lima
- Division of Cardiology, Johns Hopkins Bayview Medical Center, United States
| | - A Maisel
- School of Medicine, University of California, San Diego, United States
| | - A R Folsom
- School of Public Health, Division of Epidemiology & Community Health, University of Minnesota, West Bank Office Building 1300 South, Second Street, Suite 300, 55454-1015 Minneapolis, United States
| | - D R Jacobs
- School of Public Health, Division of Epidemiology & Community Health, University of Minnesota, West Bank Office Building 1300 South, Second Street, Suite 300, 55454-1015 Minneapolis, United States
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Camargo GC, Rothstein T, Junqueira FP, Fernandes E, Lima RL, Greiser A, Strecker R, Lima JA, Xavier SS, Gottlieb I. Myocardial iron quantification using modified Look-Locker inversion recovery (MOLLI) T1 mapping at 3 Tesla. J Cardiovasc Magn Reson 2013. [PMCID: PMC3560063 DOI: 10.1186/1532-429x-15-s1-w8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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20
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Godoy GK, Vavere A, Miller JM, Chahal H, Niinuma H, Lemos P, Hoe J, Paul N, Clouse ME, Ramos CD, Lima JA, Arbab-Zadeh A. Quantitative coronary arterial stenosis assessment by multidetector CT and invasive coronary angiography for identifying patients with myocardial perfusion abnormalities. J Nucl Cardiol 2012; 19:922-30. [PMID: 22814771 DOI: 10.1007/s12350-012-9598-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Accepted: 07/05/2012] [Indexed: 10/28/2022]
Abstract
BACKGROUND Semi-quantitative stenosis assessment by coronary CT angiography only modestly predicts stress-induced myocardial perfusion abnormalities. The performance of quantitative CT angiography (QCTA) for identifying patients with myocardial perfusion defects remains unclear. METHODS CorE-64 is a multicenter, international study to assess the accuracy of 64-slice QCTA for detecting ≥50% coronary arterial stenoses by quantitative coronary angiography (QCA). Patients referred for cardiac catheterization with suspected or known coronary artery disease were enrolled. Area under the receiver-operating-characteristic curve (AUC) was used to evaluate the diagnostic accuracy of the most severe coronary artery stenosis in a subset of 63 patients assessed by QCTA and QCA for detecting myocardial perfusion abnormalities on exercise or pharmacologic stress SPECT. RESULTS Diagnostic accuracy of QCTA for identifying patients with myocardial perfusion abnormalities by SPECT revealed an AUC of 0.71, compared to 0.72 by QCA (P = .75). AUC did not improve after excluding studies with fixed myocardial perfusion abnormalities and total coronary arterial occlusions. Optimal stenosis threshold for QCTA was 43% yielding a sensitivity of 0.81 and specificity of 0.50, respectively, compared to 0.75 and 0.69 by QCA at a threshold of 59%. Sensitivity and specificity of QCTA to identify patients with both obstructive lesions and myocardial perfusion defects were 0.94 and 0.77, respectively. CONCLUSIONS Coronary artery stenosis assessment by QCTA or QCA only modestly predicts the presence and the absence of myocardial perfusion abnormalities by SPECT. Confounding variables affecting the relationship between coronary anatomy and myocardial perfusion likely account for some of the observed discrepancies between coronary angiography and SPECT results.
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Affiliation(s)
- G K Godoy
- Division of Cardiology, Johns Hopkins University, Baltimore, MD, 21287, USA
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21
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Vogel-Claussen J, Skrok J, Shehata M, Claussen C, Lima JA, Bluemke DA, Hassoun P. Reduzierte Biventriculäre Myokardperfusionsreserve bei Patienten mit Sklerodermie-assoziierter und idiopathischer (IPAH) pulmonaler arterieller Hypertonie (PAH). ROFO-FORTSCHR RONTG 2010. [DOI: 10.1055/s-0030-1252801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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22
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Bastos MF, Lima JA, Vieira PM, Mestnik MJ, Faveri M, Duarte PM. TNF-α and IL-4 levels in generalized aggressive periodontitis subjects. Oral Dis 2009; 15:82-7. [DOI: 10.1111/j.1601-0825.2008.01491.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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23
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Dewey M, Vavere AL, Arbab-Zadeh A, Miller JM, Sara L, Cox C, Lima JA, Clouse M. Prädiktoren für die diagnostische Genauigkeit der 64-Zeilen-CT-Koronarangiographie im Vergleich zur konventionellen Koronarangiographie – Ergebnisse der CorE64-Multicenterstudie. ROFO-FORTSCHR RONTG 2008. [DOI: 10.1055/s-2008-1073759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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24
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Lima JA, Oliveira AS, de Miranda ALP, Rezende CM, Pinto AC. Anti-inflammatory and antinociceptive activities of an acid fraction of the seeds of Carpotroche brasiliensis (Raddi) (Flacourtiaceae). Braz J Med Biol Res 2005; 38:1095-103. [PMID: 16007281 DOI: 10.1590/s0100-879x2005000700013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Carpotroche brasiliensis is a native Brazilian tree belonging to the Oncobeae tribe of Flacourtiaceae. The oil extracted from its seeds contains as major constituents the same cyclopentenyl fatty acids hydnocarpic (40.5%), chaulmoogric (14.0%) and gorlic (16.1%) acids found in the better known chaulmoogra oil prepared from the seeds of various species of Hydnocarpus (Flacourtiaceae). These acids are known to be related to the pharmacological activities of these plants and to their use as anti-leprotic agents. Although C. brasiliensis oil has been used in the treatment of leprosy, a disease that elicits inflammatory responses, the anti-inflammatory and analgesic activities of the oil and its constituents have never been characterized. We describe the anti-inflammatory and antinociceptive activities of C. brasiliensis seed oil in acute and chronic models of inflammation and in peripheral and central nociception. The mixture of acids from C. brasiliensis administered orally by gavage showed dose-dependent (10-500 mg/kg) anti-inflammatory activity in carrageenan-induced rat paw edema, inhibiting both the edema by 30-40% and the associated hyperalgesia. The acid fraction (200 mg/kg) also showed significant antinociceptive activity in acetic acid-induced constrictions (57% inhibition) and formalin-induced pain (55% inhibition of the second phase) in Swiss mice. No effects were observed in the hot-plate (100 mg/kg; N = 10), rota-road (200 mg/kg; N = 9) or adjuvant-induced arthritis (50 mg/kg daily for 7 days; N = 5) tests, the latter a chronic model of inflammation. The acid fraction of the seeds of C. brasiliensis which contains cyclopentenyl fatty acids is now shown to have significant oral anti-inflammatory and peripheral antinociceptive effects.
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Affiliation(s)
- J A Lima
- Departamento de Química Orgânica, Instituto de Química, Universidade Federal do Rio de Janeiro, RJ, Brasil
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25
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Silber HA, Bluemke DA, Ouyang P, Du YP, Post WS, Lima JA. The relationship between vascular wall shear stress and flow-mediated dilation: endothelial function assessed by phase-contrast magnetic resonance angiography. J Am Coll Cardiol 2001; 38:1859-65. [PMID: 11738285 DOI: 10.1016/s0735-1097(01)01649-7] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
OBJECTIVES We sought: 1) to investigate the relationship between vascular wall shear stress and flow-mediated dilation (FMD) in humans, and 2) to investigate whether this relationship could explain why FMD is greater in small arteries. BACKGROUND Arterial wall shear stress (WSS) is considered to be the primary stimulus for the endothelial-dependent FMD response. However, the relationship between WSS and FMD has not been investigated in humans. Furthermore, FMD is greater in small arteries, though the reasons for this phenomenon are unclear. METHODS Using phase-contrast magnetic resonance angiography (PMRCA), we measured hyperemic WSS and FMD in 18 healthy volunteers. Peak systolic WSS was calculated assuming a blunted parabolic velocity profile. Diameter by PCMRA and by ultrasound was compared in nine subjects. RESULTS Flow-mediated dilation was linearly proportional to hyperemic peak systolic WSS (r = 0.79, p = 0.0001). Flow-mediated dilation was inversely related to baseline diameter (r = 0.62, p = 0.006), but the hyperemic peak WSS stimulus was also inversely related to baseline diameter (r = 0.47, p = 0.049). Phase-contrast magnetic resonance angiography and ultrasound diameters were compared in nine subjects and correlated well (r = 0.84, p < 0.0001), but diameter by PCMRA was greater (4.1 +/- 0.7 mm vs. 3.7 +/- 0.5 mm, p = 0.009). CONCLUSION Arterial FMD is linearly proportional to peak hyperemic WSS in normal subjects. Thus, the endothelial response is linearly proportional to the stimulus. Furthermore, the greater FMD response in small arteries is accounted for, at least partially, by a greater hyperemic WSS stimulus in small arteries. By allowing the calculation of vascular WSS, which is the stimulus for FMD, and by imaging a fixed arterial cross-section, thus reducing operator dependence, PCMRA enhances the assessment of vascular endothelial function.
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Affiliation(s)
- H A Silber
- Johns Hopkins Medical Institutions, Baltimore, Maryland 21287, USA
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26
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Kraitchman DL, Hillenbrand HB, Oznur I, Lima JA, McVeigh ER, Zerhouni EA, Bluemke DA. Noninvasive assessment of myocardial stunning from short-term coronary occlusion using tagged magnetic resonance imaging. J Cardiovasc Magn Reson 2001; 2:123-36. [PMID: 11545128 DOI: 10.3109/10976640009148681] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Brief myocardial ischemia of less than 20 min duration, followed by reperfusion, is known to cause transient contractile dysfunction, often termed myocardial stunning. Tagged magnetic resonance imaging offers a noninvasive method that can be used to quantify this regional mechanical dysfunction in stunned myocardium. To this end, a closed-chest canine model of myocardial stunning was created by short-term (approximately 20-min) coronary occlusion, via inflation of an angioplasty balloon placed fluoroscopically in the left anterior descending (LAD) coronary, followed by reperfusion. Changes in myocardial strain before occlusion, during occlusion, and at 15 and 30 min after reperfusion were determined using repeated-measures analysis of variance. After instrumentation but before coronary occlusion, global reductions in myocardial strain were observed relative to animals that did not undergo coronary catheterization procedures. Declines of 46% and 49% in regional myocardial blood flow in the LAD and left circumflex bed, respectively, from preinstrumentation levels occurred due to coronary angiography and placement of a deflated angioplasty balloon in the LAD for 1 hr. During LAD occlusion, maximum myocardial shortening was significantly reduced in the anterior and anteroseptal regions of the left ventricular apex (i.e., ischemic region) but returned to baseline values by 30 min after reperfusion. No augmentation of myocardial function was observed in the nonischemic regions during occlusion or reperfusion. Thus, this noninvasive technique to evaluate myocardial ischemia demonstrated a graded response in myocardial function to ischemia and persistent regional dysfunction or "myocardial stunning" after short-term coronary occlusion.
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Affiliation(s)
- D L Kraitchman
- Department of Radiology, Johns Hopkins University, Baltimore, Maryland, USA
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27
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Hillenbrand HB, Lima JA, Bluemke DA, Beache GM, McVeigh ER. Assessment of myocardial systolic function by tagged magnetic resonance imaging. J Cardiovasc Magn Reson 2001; 2:57-66. [PMID: 11545108 DOI: 10.3109/10976640009148674] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Tagged magnetic resonance imaging (MRI) can assess myocardial function by tracking the motion of the myocardium during the various phases of the cardiac cycle. In contrast to experimental methods, such as implantation of radiopaque markers or sonomicrometry, tagged MRI is noninvasive, carries no risk of radiation exposure, and can be used in the context of clinical routine. For the physician, using tagged MRI to its fullest potential requires an understanding of the technique and the derived parameters of myocardial systolic function. This work describes the tagged MRI technique and explains the quantification of systolic function with respect to the underlying theory of the mechanics of a continuous medium. The advantages of tagged MRI in coronary artery disease are emphasized, and currently available data on tagged MRI in coronary artery disease are reviewed.
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Affiliation(s)
- H B Hillenbrand
- Department of Radiology, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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28
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Wu KC, Heldman AW, Brinker JA, Hare JM, Lima JA. Microvascular obstruction after nonsurgical septal reduction for the treatment of hypertrophic cardiomyopathy. Circulation 2001; 104:1868. [PMID: 11591628 DOI: 10.1161/hc4001.096355] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- K C Wu
- Department of Medicine, Division of Cardiology, Johns Hopkins Medical Institutions, Baltimore, Md, USA.
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29
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Gerber BL, Rochitte CE, Bluemke DA, Melin JA, Crosille P, Becker LC, Lima JA. Relation between Gd-DTPA contrast enhancement and regional inotropic response in the periphery and center of myocardial infarction. Circulation 2001; 104:998-1004. [PMID: 11524392 DOI: 10.1161/hc3401.095113] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Gd-DTPA contrast-enhanced (CE) MRI identifies patterns of early hypoenhancement and delayed hyperenhancement in acute myocardial infarction, but their clinical significance for the prediction of myocardial viability remains controversial. Therefore, we closely examined the relationship between these CE patterns and regional inotropic response to low-dose dobutamine infusion at a regional level. METHODS AND RESULTS Thirteen dogs underwent CE and tagged MRI at rest and during 5 microg. kg(-1). min(-1) dobutamine 48 hours after MI. CE patterns and 3D regional strains were measured in 96 segments per animal. Segments were categorized as being normofunctional (n=828) if resting circumferential shortening was within the range of remote myocardium, or dysfunctional (n=420) if not. Inotropic response in resting dysfunctional segments was assessed according to CE patterns. Significant improvement of radial thickening (from +12+/-1% [mean+/-SEM] to +22+/-2%, P<0.05) and circumferential shortening (from +1+/-1% to -5+/-1%, P<0.05) strains occurred in dysfunctional myocardium with normal CE pattern but not in myocardium with early hypoenhancement. Delayed hyperenhanced myocardium displayed a more complex behavior. Circumferential stretching improved in the peripheral regions (from +4+/-1% to -2+/-2%, P<0.05), where the infarct was nontransmural (38+/-3% transmurality), but not in centrally hyperenhanced regions (from +4+/-1% to +1+/-1% P=NS), where the infarct was 66+/-3% transmural. CONCLUSIONS Inotropic reserve was confined to dysfunctional myocardium with normal contrast enhancement but not to myocardium with early hypoenhancement. Inotropic response in delayed hyperenhanced myocardium is influenced by transmurality of necrosis. These observations support the use of CE MRI for the clinical detection of myocardial viability.
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Affiliation(s)
- B L Gerber
- Cardiology Division, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA
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30
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Yeon SB, Reichek N, Tallant BA, Lima JA, Calhoun LP, Clark NR, Hoffman EA, Ho KK, Axel L. Validation of in vivo myocardial strain measurement by magnetic resonance tagging with sonomicrometry. J Am Coll Cardiol 2001; 38:555-61. [PMID: 11499752 DOI: 10.1016/s0735-1097(01)01397-3] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
OBJECTIVES This study was designed to validate strain measurements obtained using magnetic resonance tagging with spatial modulation of magnetization (SPAMM). We compared circumferential segment shortening measurements (%S) obtained using SPAMM to sonomicrometry %S in a canine model with (n = 28) and without (n = 3) coronary artery ligation. BACKGROUND Magnetic resonance tagging enables noninvasive measurement of myocardial strain, but such strain measurements have not yet been validated in vivo. METHODS Circumferential sonomicrometry crystal pairs were placed in apical myocardium at ischemic risk in ligation studies and in adjacent and remote myocardium. The %S was obtained from closely juxtaposed sonomicrometry and SPAMM sites. RESULTS Paired data were available from 19 of 31 studies. Both methods distinguished remote from ischemic function effectively (p = 0.014 for SPAMM and p = 0.002 for sonomicrometry). SPAMM %S was similar to sonomicrometry %S in ischemic myocardium (2 +/- 3 vs. 0 +/- 3 p = 0.067) but was slightly higher than sonomicrometry %S in remote myocardium (11 +/- 10 vs. 7 +/- 5, p = 0.033). End-systolic (n = 30) and late systolic (n = 34) SPAMM %S correlated well with sonomicrometry %S (r = 0.84, p < 0.0001 and r = 0.88, p < 0.0001). CONCLUSIONS Magnetic resonance tagging using SPAMM can quantitate myocardial strain in ischemic and remote myocardium. This study validates its application in scientific investigation and clinical assessment of patients with myocardial ischemia.
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Affiliation(s)
- S B Yeon
- Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts 02215, USA.
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31
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Abstract
Important advances in rapid magnetic resonance (MR) imaging technology and its application to cardiovascular imaging have been made during the past decade. High-field-strength clinical magnets, high-performance gradient hardware, and ultrafast pulse sequence technology are rapidly making the vision of a comprehensive "one-stop shop" cardiac MR imaging examination a reality. This examination is poised to have a significant effect on the management of coronary artery disease by means of assessment of wall motion with tagging and pharmacologic stress testing, evaluation of the coronary microvasculature with perfusion imaging, and direct visualization of the coronary arteries with MR coronary angiography. This article reviews current state-of-the-art pulse sequence technology and its application to the evaluation of ischemic heart disease by means of MR tagging with dobutamine stress testing, MR perfusion imaging, and MR coronary angiography. Cutting edge areas of research in coil design and exciting new areas of metabolic and oxygen level-dependent imaging are also explored.
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Affiliation(s)
- S B Reeder
- Department of Radiology, Rm H1306, Stanford University, 300 Pasteur Dr, Stanford, CA 94304, USA.
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32
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Shunk KA, Garot J, Atalar E, Lima JA. Transesophageal magnetic resonance imaging of the aortic arch and descending thoracic aorta in patients with aortic atherosclerosis. J Am Coll Cardiol 2001; 37:2031-5. [PMID: 11419883 DOI: 10.1016/s0735-1097(01)01340-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
OBJECTIVES We sought to determine the feasibility and potential of transesophageal magnetic resonance imaging (TEMRI) for quantifying atherosclerotic plaque burden in the aortic arch and descending thoracic aorta in comparison with transesophageal echocardiography (TEE). BACKGROUND Improved morphologic assessment of atherosclerotic plaque features in vivo is of interest because of the potential for improved understanding of the pathophysiology of plaque vulnerability to rupture and progression to clinical events. Magnetic resonance imaging (MRI) is well suited for atherosclerotic plaque imaging. Performing MRI using a radio frequency (RF) receiver probe placed near the region of interest improves the signal-to-noise ratio (SNR). METHODS High-resolution images of the thoracic aortic wall were obtained by TEMRI in 22 subjects (8 normals, 14 with aortic atherosclerosis). In nine subjects, we compared aortic wall thickness and circumferential extent of atherosclerotic plaque measured by TEMRI versus TEE using a Bland-Altman analysis. Additional studies were performed in a human cadaver with pathology as an independent gold standard for assessment of atherosclerosis. RESULTS In clinical and experimental studies, we found similar measurements for aortic plaque thickness but a relative underestimation of circumferential extent of atherosclerosis by TEE (p = 0.001), due in large part to the lower SNR in the near field. CONCLUSIONS Using TEMRI allows for quantitative assessment of thoracic aortic atherosclerotic plaque burden. This technique provides good SNR in the near field, which makes it a promising approach for detailed characterization of aortic plaque burden.
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Affiliation(s)
- K A Shunk
- Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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Tatani SB, Fukujima MM, Lima JA, Ferreira LD, Ghefter CG, Prado GF, Babayan Z, Azevedo LA. Clinical impact of transesophageal echocardiography in patients with stroke without clinical evidence of cardiovascular sources of emboli. Arq Bras Cardiol 2001; 76:453-61. [PMID: 11449291 DOI: 10.1590/s0066-782x2001000600003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVE The purpose of this study is to evaluate the impact of transeophageal echocardiography on management of patients at low-risk for cardiogenic embolism to prevent new potential cardiovascular sources of emboli. METHODS We studied 69 patients with ischemic stroke at low-risk for cardiogenic embolism. Transeophageal echocardiography was performed to access: left atrium enlargement; communication or aneurysm of the interatrial septum; patent foramen ovale; spontaneous echo contrast or intracavitary thrombi; the presence of intraaortic atherosclerotic plaques or thrombi; significant valvar morphologic alteration or dysfunction; left ventricle enlargement, hypertrophy, or contractile abnormality. Transesophageal echocardiography altered clinical management, and we adopted anticoagulant therapy or another procedure apart from the use of acetylsalicylic acid. RESULTS Transeophageal echocardiography detected at least one abnormality in 40 cases (58%). Clinical conduct was adjusted after the performance of transesophageal echocardiography in 11 patients (15.9%); anticoagulation was added in 10 cases and surgical correction in one patient. CONCLUSION Transeophageal echocardiography was a very useful tool in the secondary prevention for stroke in patients at low risk for cardiogenic embolism.
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Affiliation(s)
- S B Tatani
- OMNI, Centro de Cardiologia Não Invasiva UNIPESP-Escola Paulista de Medicina, São Paulo, Brazil
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34
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Abstract
The thoracic aortic wall is a common site of atherosclerotic plaque in humans. Tools for serial, non-invasive assessment of these plaques are of value for addressing gaps in our basic understanding of the biology of plaque rupture and its relationship to atherosclerotic disease progression as well as for monitoring response to anti-atherosclerotic interventions in therapeutic clinical trials. Common approaches to assessment of the wall of the thoracic aorta in vivo are limited. Here we discuss some of the challenges and limitations encountered by conventional techniques and review a novel approach, transesophageal MRI (TEMRI). Initial experiences in applying the TEMRI approach to assessment of aortic morphology and pathology are discussed.
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Affiliation(s)
- K A Shunk
- Division of Cardiology, Johns Hopkins University, Baltimore, Maryland, USA.
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35
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Gardin JM, McClelland R, Kitzman D, Lima JA, Bommer W, Klopfenstein HS, Wong ND, Smith VE, Gottdiener J. M-Mode echocardiographic predictors of six- to seven-year incidence of coronary heart disease, stroke, congestive heart failure, and mortality in an elderly cohort (the cardiovascular health study). Am J Cardiol 2001; 87:1051-7. [PMID: 11348601 DOI: 10.1016/s0002-9149(01)01460-6] [Citation(s) in RCA: 345] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Previous studies have identified a number of echocardiographic variables that predict cardiovascular disease (CVD) events and mortality, but have not focused on a large elderly cohort. The purpose of this study was to determine whether M-mode echocardiographic variables predicted all-cause mortality, incident coronary heart disease (CHD), congestive heart failure (CHF), and stroke in a large prospective, multicenter, population-based study. In the Cardiovascular Health Study, a biracial cohort of 5,888 men and women (mean age 73 years) underwent 2-dimensional M-mode echocardiographic measurements of left ventricular (LV) internal dimensions, wall thickness, mass and geometry, as well as measurement of left atrial dimension and assessment for mitral annular calcium. Participants were followed for 6 to 7 years for incident events; analyses excluded subjects with prevalent disease. One or more echocardiographic measurements were independent predictors of all-cause mortality and incident CHD, CHF, and stroke. After adjustment for anthropometric and traditional CVD risk factors, LV mass was significantly related to incident CHD, CHF, and stroke. The highest quartile of LV mass conferred a hazards ratio of 3.36, compared with the lowest quartile, for incident CHF. Furthermore, incident CHF-free survival was significantly lower for participants with LV mass in the highest versus the 2 lowest quartiles (86% vs 97%, respectively, at 2,500 days). Eccentric and concentric LV hypertrophy, respectively, conferred adjusted hazards ratios, compared with normal LV geometry, of 2.05 and 1.61 for incident CHD, and 2.95 and 3.32 for incident CHF. Thus, in an elderly biracial population, selected 2-dimensional M-mode echocardiographic measurements were important markers of subclinical disease and conferred independent prognostic information for incident CVD events, especially CHF and CHD.
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Affiliation(s)
- J M Gardin
- Division of Cardiology, Department of Medicine, University of California, Irvine, California, USA.
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36
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Abstract
The kinetic foundations of Tsallis' nonextensive thermostatistics are investigated through Boltzmann's transport equation approach. Our analysis follows from a nonextensive generalization of the "molecular chaos hypothesis." For q>0, the q-transport equation satisfies an H theorem based on Tsallis entropy. It is also proved that the collisional equilibrium is given by Tsallis' q-nonextensive velocity distribution.
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Affiliation(s)
- J A Lima
- Departamentode Fisica Teórica e Experimental, Universidade Federal do Rio Grande do Norte, Natal-RN, Brazil
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37
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Abstract
Magnetic resonance imaging offers the unique opportunity to directly visualize the size and location of myocardial infarcts (MIs) with excellent spatial resolution. Because infarct size is the most important determinant of postinfarct outcome, precise determination of infarct size may be valuable to risk stratify patients after acute MI. In addition, infarct imaging may provide direct information on the amount of irreversibly injured myocardium and thus can be used to identify myocardial viability in dysfunctional regions. Acute infarcts can be recognized as hyperintense signal on T2-weighted spin-echo images. This technique, however, does not identify chronic infarcts and may overestimate infarct size by including area at risk. Also, T2-weighted images often have a low signal-to-noise ratio. Contrast-enhanced perfusion imaging provides better-quality images. Extravascular contrast agents such as (Gd-DTPA) gadolinium diethyletriamine-pentaacetic acid identify infarcts as hyperenhanced regions on images acquired late after contrast injection. In addition, these tracers can examine the integrity and permeability of infarct microvasculature on first-pass perfusion images. Necrosis avid tracers and 23Na imaging are other new exciting approaches to identify infarcted myocardium acutely after MI. These techniques, are still investigational, and their value for clinical imaging remains to be established.
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Affiliation(s)
- B L Gerber
- Department of Medicine, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
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Abstract
OBJECTIVES The goal of this study was to characterize detailed transmural left ventricular (LV) function at rest and during dobutamine stimulation in subendocardial and transmural experimental infarcts. BACKGROUND The relation between segmental LV function and the transmural extent of myocardial necrosis is complex. However, its detailed understanding is crucial for the diagnosis of myocardial viability as assessed by inotropic stimulation. METHODS Short-axis tagged magnetic resonance images were acquired at five to seven levels encompassing the LV from base to apex in seven dogs 2 days after a 90-min closed-chest left anterior descending coronary occlusion, followed by reflow. Myocardial strains were measured transmurally in the entire LV by harmonic phase imaging at rest and 5 ig x kg(-1) x min(-1) dobutamine. Risk regions were assessed by radioactive microspheres, and the transmural extent of the infarct was assessed by 2,3,5 triphenyltetrazolium chloride staining. RESULTS Circumferential shortening (Ecc), radial thickening (Err) and maximal shortening at rest were greater in segments with subendocardial versus transmural infarcts, both in subepicardium (-1.1+/-1.0 vs. 2.5+/-0.6% for Ecc, -0.5+/-1.9 vs. -1.8+/-1.0% for Err, p < 0.05) and subendocardium (-2.0+/-1.4 vs. 2.8+/-0.8%, 2.4+/-1.7 vs. 0.0+/-0.9%, respectively, p < 0.05). Under inotropic stimulation, risk regions retained maximal contractile reserve. Recruitable deformation was found in outer layers of subendocardial infarcts (p < 0.01 for Ecc and Err) but also in inner layers (p < 0.01). Conversely, no contractile reserve was observed in segments with transmural infarcts. CONCLUSIONS Under dobutamine challenge, recruitment of myofiber shortening and thickening was observed in inner layers of segments with subendocardial infarcts. These results may have important clinical implications for the detection of myocardial viability.
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Affiliation(s)
- J Garot
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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Abstract
Loss of membrane permeability caused by ischemia leads to cellular sodium accumulation and myocardial edema. This phenomenon has important implications to left ventricular structure and function in the first hours after myocardial infarction. We hypothesized that during this period of time, after prolonged coronary occlusion and complete reflow, the rate of myocardial sodium accumulation is governed by microvascular integrity. We used 3-dimensional (23)Na MRI to monitor myocardial sodium content changes over time in an in vivo closed-chest canine model (n=13) of myocardial infarction and reperfusion. Infarcts with microvascular obstruction (MO) defined by both radioactive microspheres and contrast-enhanced (1)H MRI showed a slower rate of sodium accumulation as well as lower blood flow at 20 minutes and 6 hours after reperfusion. Conversely, the absence of MO was associated with faster rates of sodium accumulation and greater blood flow restoration. In addition, infarct size by (23)Na MRI correlated best with infarct size by triphenyltetrazolium chloride and contrast-enhanced (1)H MRI at 9 hours after reperfusion. We conclude that in reperfused myocardial infarction, sodium accumulation is dependent on microvascular integrity and is slower in regions of MO compared with those with patent microvasculature. Finally, (23)Na MRI can be a useful tool for monitoring in vivo myocardial sodium content in acute myocardial infarction.
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Affiliation(s)
- C E Rochitte
- Cardiology Division, Department of Medicine, Johns Hopkins University, Baltimore, MD, USA
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40
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Gerber BL, Rochitte CE, Melin JA, McVeigh ER, Bluemke DA, Wu KC, Becker LC, Lima JA. Microvascular obstruction and left ventricular remodeling early after acute myocardial infarction. Circulation 2000; 101:2734-41. [PMID: 10851212 DOI: 10.1161/01.cir.101.23.2734] [Citation(s) in RCA: 210] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND The presence of microvascular obstruction (MO) within infarcted regions may adversely influence left ventricular (LV) remodeling after acute myocardial infarction. This study examined whether the extent of MO directly alters the mechanical properties of the infarcted myocardium. METHODS AND RESULTS Seventeen dogs underwent 90 minutes of balloon occlusion of the left anterior descending coronary artery, followed by reperfusion. Gadolinium-enhanced perfusion MRI and 3D-tagging were performed 4 to 6 and 48 hours (8 animals) and 10 days (9 animals) after reperfusion. Early increase in LV end-diastolic volume (from 42+/-9 to 54+/-14 mL, P<0.05) between 4 to 6 and 48 hours after reperfusion was predicted by both extent of MO (r=0.89, P<0.01) and infarct size (r=0.83, P<0.01), defined as MRI hypoenhanced and hyperenhanced regions, respectively. Multivariate analysis demonstrated that extent of MO had better and independent value to predict LV volume than overall infarct size. A strong inverse relationship existed between magnitude of first principal strain (r=-0.80, P<0.001) and relative extent of MO within infarcted myocardium. Also, infarcted myocardium involved by extensive areas of MO demonstrated reductions of circumferential (r=-0.61, P<0.01) and longitudinal (r=-0.53, P<0. 05) stretching. Furthermore, significant reductions of radial thickening (9+/-6% versus 14+/-3%, P<0.01) occurred in noninfarcted regions adjacent to infarcts that had increased (>35%) amounts of MO. CONCLUSIONS In the early healing phase of acute myocardial infarction, the extent of MO in infarcted tissue relates to reduced local myocardial deformation and dysfunction of noninfarcted adjacent myocardium. Such strain alterations might explain the increased remodeling observed in patients with large regions of MO.
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Affiliation(s)
- B L Gerber
- Cardiology Division, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD 21287-6568, USA
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Garot J, Bluemke DA, Osman NF, Rochitte CE, McVeigh ER, Zerhouni EA, Prince JL, Lima JA. Fast determination of regional myocardial strain fields from tagged cardiac images using harmonic phase MRI. Circulation 2000; 101:981-8. [PMID: 10704164 DOI: 10.1161/01.cir.101.9.981] [Citation(s) in RCA: 159] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Tagged MRI of the heart is difficult to implement clinically because of the lack of fast analytical techniques. We investigated the accuracy of harmonic phase (HARP) imaging for rapid quantification of myocardial strains and for detailed analysis of left ventricular (LV) function during dobutamine stimulation. METHODS AND RESULTS Tagged MRI was performed in 10 volunteers at rest and during 5 to 20 microg(-1). kg(-1). min(-1) dobutamine and in 9 postinfarct patients at rest. We compared 2D myocardial strains (circumferential shortening, Ecc; maximal shortening, E(2); and E(2), direction) as assessed by a conventional technique and by HARP. Full quantitative analysis of the data was 10 times faster with HARP. For pooled data, the regression coefficient was r=0.93 for each strain (P<0.001). In volunteers, Ecc and E(2) were greater in the free wall than in the septum (P<0.01), but recruitable myocardial strain at peak dobutamine was greater in the LV septum (P<0.01). E(2) orientation shifted away from the circumferential direction at peak dobutamine (P<0.01). HARP accurately detected subtle changes in myocardial strain fields under increasing doses of dobutamine. In patients, HARP-determined Ecc and E(2) values were dramatically reduced in the asynergic segments as compared with remote (P<0.001), and E(2) direction shifted away from the circumferential direction (P<0.001). CONCLUSIONS HARP MRI provides fast, accurate assessment of myocardial strains from tagged MR images in normal subjects and in patients with coronary artery disease with wall motion abnormalities. HARP correctly indexes dobutamine-induced changes in strains and has the potential for on-line quantitative monitoring of LV function during stress testing.
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Affiliation(s)
- J Garot
- Cardiology Division of the Department of Medicine, Johns Hopkins University, Baltimore, MD 21287-6568, USA.
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Abstract
Advances in magnetic resonance imaging (MRI) have led to more widespread utilization of this diagnostic imaging modality in the diagnosis of coronary artery disease. With MRI, the complexity and heterogeneity of myocardial infarcts can be demonstrated. By using this technique, much insight has been gained into the pathophysiologic mechanisms of acute coronary thrombosis and reperfusion. MRI has significant diagnostic potential, particularly if one can combine studies of myocardial function, perfusion, and sodium metabolism with the noninvasive assessment of coronary anatomy and epicardial coronary artery blood flow.
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Affiliation(s)
- K C Wu
- Division of Cardiology, Johns Hopkins University Hospital, Baltimore, Maryland 21287, USA
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Kass DA, Chen CH, Talbot MW, Rochitte CE, Lima JA, Berger RD, Calkins H. Ventricular pacing with premature excitation for treatment of hypertensive-cardiac hypertrophy with cavity-obliteration. Circulation 1999; 100:807-12. [PMID: 10458715 DOI: 10.1161/01.cir.100.8.807] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Hypertensive left ventricular hypertrophy with supranormal systolic ejection and distal cavity obliteration (HHCO) can result in debilitating exertional fatigue and dyspnea. Dual-chamber pacing with ventricular preactivation generates discoordinate contraction, which can limit cavity obliteration and thereby increase potential ejection reserve. Accordingly, we hypothesized that pacing may improve exercise tolerance long-term in this syndrome. METHODS AND RESULTS Dual-chamber pacemakers were implanted in 9 patients with exertional dyspnea caused by HHCO. Intrinsic atrial rate was sensed, and ventricular preactivation was achieved by shortening the atrial-ventricular delay. Pacing was on or off for successive 3-month periods (randomized, double-blind, crossover design), followed by 6 additional pacing-on months. Metabolic exercise testing, quality-of-life assessment, and rest and dobutamine-stress echocardiographic/Doppler data were obtained. After 3 months of pacing-on, exercise duration rose from 324+/-133 to 588+/-238 s (mean+/-SD; P=0.001, with 7 of 9 patients improving >/=30%), and maximal oxygen consumption increased from 13.6+/-2.9 to 16.7+/-3.3 mL of O(2). min(-1). kg(-1) (P<0.02). Both parameters were little changed from baseline during the pacing-off period. Improved exercise capacity persisted at 1-year follow-up. Clinical symptoms and activities of daily living improved during the pacing-on period and stayed improved at 1 year, but they were little changed during the pacing-off period. Despite similar basal values, stroke volume (P<0.001) and cardiac output (P<0.02) increased with dobutamine stimulation 2 to 3 times more after 1 year of follow-up as compared with baseline. CONCLUSIONS Long-term dual-chamber pacing can improve exercise capacity, cardiac reserve, clinical symptoms, and activities of daily living in patients with HHCO. This therapy may provide a novel alternative for patients in whom traditional pharmacological treatment proves inadequate.
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Affiliation(s)
- D A Kass
- Division of Cardiology, Department of Medicine, The Johns Hopkins Medical Institutions, Baltimore, Maryland, USA.
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Smith NL, Psaty BM, Furberg CD, White R, Lima JA, Newman AB, Manolio TA. Temporal trends in the use of anticoagulants among older adults with atrial fibrillation. Arch Intern Med 1999; 159:1574-8. [PMID: 10421280 DOI: 10.1001/archinte.159.14.1574] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
BACKGROUND Several recent randomized clinical trials have demonstrated that warfarin sodium treatment, and to a lesser extent aspirin, reduces risk of stroke and death compared with placebo in persons with atrial fibrillation. Insufficient documentation exists on the extent to which the use of these therapies following trial publications has continued to increase in the elderly with atrial fibrillation. METHODS We used data from the Cardiovascular Health Study, a study of 5888 community-dwelling adults aged 65 years or older, to determine the prevalence of warfarin and aspirin use in persons with electrocardiogram-identified atrial fibrillation. Electrocardiogram examinations were conducted at baseline from 1989 through 1990, and at 6 subsequent annual examinations through 1995-1996. Medication data were collected by inventory methods at each examination. Temporal change in use of anticoagulants was analyzed by comparing percentage use in 1990 to use in each year through 1996. RESULTS The use of warfarin increased 4-fold from 13% in 1990 to 50% in 1996 among participants with prevalent atrial fibrillation (P<.001). Daily use of aspirin did not increase over time. Participants younger than 80 years were 4 times more likely to use warfarin in 1996 (P<.001) than those 80 years and older. Use of aspirin did not vary significantly with age. CONCLUSIONS Warfarin use in community-dwelling elderly persons with electrocardiogram-documented atrial fibrillation increased steadily following the first publication of its treatment benefit, reaching 50% by 1996. In contrast, use of aspirin was unchanged during this same period. Continued efforts to promote appropriate anticoagulation therapy to physicians and their patients may still be needed.
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Affiliation(s)
- N L Smith
- Department of Medicine, University of Washington, Seattle, USA.
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Kim RJ, Judd RM, Chen EL, Fieno DS, Parrish TB, Lima JA. Relationship of elevated 23Na magnetic resonance image intensity to infarct size after acute reperfused myocardial infarction. Circulation 1999; 100:185-92. [PMID: 10402449 DOI: 10.1161/01.cir.100.2.185] [Citation(s) in RCA: 96] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Elevated 23Na MR image intensity after acute myocardial infarction has previously been shown to correspond to high tissue [Na+] and loss of myocardial viability. In this study, we explored the potential of in vivo 23Na MRI to assess infarct size and investigated possible mechanisms for elevated 23Na image intensity. METHODS AND RESULTS Thirteen dogs and 8 rabbits underwent in situ coronary artery occlusion and reperfusion and were imaged by 23Na MRI. For anatomically matched left ventricular short-axis cross sections (n=46), infarct size measured by in vivo 23Na MRI correlated well with triphenyltetrazolium chloride staining (r=0.87, y=0.92x+3.37, P<0.001). Elevated 23Na image intensity was observed in infarcted myocardium (206+/-37% of remote in dogs, P<0.001; 215+/-58% in rabbits, P<0.002) but was not observed after severe but reversible ischemic injury (101+/-11% of baseline, P=NS). High-resolution ex vivo imaging revealed that regions of elevated 23Na image intensity appeared to be identical to those of infarcted regions (r=0.97, y=0.92x+1.52, P<0.001). In infarcted regions, total tissue [Na+] was elevated (89+/-12 versus 37+/-9 mmol/L in control tissue, 156+/-60% increase, P<0.001) and was associated with increased intracellular sodium (254+/-68% of control, P<0.005) and an increased intracellular sodium/potassium ratio (868+/-512% of control, P<0.002). Morphometric analysis demonstrated only a minor increase in extracellular volume (17+/-8% versus 14+/-5%, P<0.05) in the infarcted territory. CONCLUSIONS Elevated 23Na MR image intensity in vivo measures infarct size after reperfused infarction in both a large and a small animal model. The mechanism of elevated 23Na image intensity is probably intracellular sodium accumulation secondary to loss of myocyte ionic homeostasis.
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Affiliation(s)
- R J Kim
- Northwestern University Medical School, Chicago, IL, USA
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Abstract
The purpose of this study was to develop a non-invasive method of imaging the thoracic aorta that would provide both morphological detail within the aortic wall and information about regional aortic wall motion. An esophageal probe is described that allows transesophageal MR imaging (TEMRI) of the thoracic aorta and has several potential advantages over the competing non-vasculoinvasive techniques of transesophageal echocardiography (TEE) or standard MRI. The probe consists of a loopless antenna housed inside a modified Levin gastric tube, with external matching and tuning circuitry. Using this probe, the thoracic aorta has been imaged in longitudinal and cross-sectional views. Details of the aortic wall were readily seen. Tissue tagging for measurement of focal stress/strain relationships was demonstrated to be feasible. TEMRI avoids the risks inherent in intravascular MRI yet provides comparable image quality. Potential applications of the device are discussed.
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Affiliation(s)
- K A Shunk
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287-0845, USA
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Lugo-Olivieri CH, Schwartzman GJ, Beall DP, Lima JA, Fishman EK. Intrapericardial bronchogenic cyst: assessment with magnetic resonance imaging and transesophageal echocardiography. Clin Imaging 1999; 23:81-4. [PMID: 10416081 DOI: 10.1016/s0899-7071(98)00101-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- C H Lugo-Olivieri
- Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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Croisille P, Moore CC, Judd RM, Lima JA, Arai M, McVeigh ER, Becker LC, Zerhouni EA. Differentiation of viable and nonviable myocardium by the use of three-dimensional tagged MRI in 2-day-old reperfused canine infarcts. Circulation 1999; 99:284-91. [PMID: 9892596 DOI: 10.1161/01.cir.99.2.284] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND To limit ischemic myocardial injury, it is important to differentiate viable from infarcted myocardium. Three dimensional (3D) tagged MRI has the ability to quantify myocardial 3D deformation and strain (noninvasively and precisely), and can achieve a true comparison of contraction not only from region to region, but also at different levels of function. In this study, we investigated whether regional strain mapping obtained by 3D-tagged MRI can differentiate between viable but stunned myocardium and nonviable myocardium. METHODS AND RESULTS We examined 7 dogs 2 days after a 90-minute closed-chest left anterior descending coronary artery occlusion followed by 48 hours of reperfusion. 3D-tagged MR images spanning the entire left ventricle were acquired both at rest and during dobutamine infusion (5 microg. kg-1. min-1 IV). Regional blood flow was measured with radioactive microspheres and used to define risk regions. Infarcted regions were defined as 2,3,5 triphenyltetrazolium chloride negative regions. Strains in infarcted regions were greatly impaired compared with remote regions (P<0.001) and remained unchanged during dobutamine stress. Risk regions showed a dysfunction at rest, with improved function during dobutamine infusion. Receiver operating characteristics analysis showed that radial strain was more accurate for identifying viable regions. CONCLUSIONS When coupled with a stress test, 3D strain mapping by the use of tagged MRI is a sensitive and noninvasive method for characterizing ischemic injury. Regional strain can be used to differentiate between viable but stunned and nonviable myocardium within the postischemic injured myocardium.
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Affiliation(s)
- P Croisille
- Departments of Radiology and Medicine of Biomedical Engineering, Johns Hopkins University, School of Medicine, Baltimore, MD, USA.
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Wu KC, Kim RJ, Bluemke DA, Rochitte CE, Zerhouni EA, Becker LC, Lima JA. Quantification and time course of microvascular obstruction by contrast-enhanced echocardiography and magnetic resonance imaging following acute myocardial infarction and reperfusion. J Am Coll Cardiol 1998; 32:1756-64. [PMID: 9822106 DOI: 10.1016/s0735-1097(98)00429-x] [Citation(s) in RCA: 245] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
OBJECTIVES We aimed to validate contrast-enhanced echocardiography (CE) in the quantification of microvascular obstruction (MO) against magnetic resonance imaging (MRI) and the histopathologic standards of radioactive microspheres and thioflavin-S staining. We also determined the time course of MO at days 2 and 9 after infarction and reperfusion. BACKGROUND Postinfarction MO occurs because prolonged ischemia produces microvessel occlusion at the infarct core, preventing adequate reperfusion. Microvascular obstruction expands up to 48 h after reperfusion; the time course beyond 2 days is unknown. Though used to study MO, CE has not been compared with MRI and thioflavin-S, which yield precise visual maps of MO. METHODS Ten closed-chest dogs underwent 90-min coronary artery occlusion and reperfusion. Both CE and MRI were performed at 2 and 9 days after reperfusion. The MO regions by both methods were quantified as percent left ventricular (% LV) mass. Radioactive microspheres were injected for blood flow determination. Postmortem, the myocardium was stained with thioflavin-S and 2,3,5-triphenyltetrazolium chloride. RESULTS Expressed as % total LV, MO by MRI matched in size MO by microspheres using a flow threshold of <40% remote (4.96+/-3.52% vs. 5.32+/-3.98%, p=NS). For matched LV cross sections, MO by CE matched in size MO by microspheres using a flow threshold of <60% remote (13.27+/-4.31% vs. 13.5+/-4.94%, p=NS). Both noninvasive techniques correlated well with microspheres (MRI vs. CE, r=0.87 vs. 0.74; p=NS). Microvascular obstruction by CE corresponded spatially to MRI-hypoenhanced regions and thioflavin-negative regions. For matched LV slices at 9 days after reperfusion, MO measured 12.94+/-4.51% by CE, 7.11+/-3.68% by MRI and 9.18+/-4.32% by thioflavin-S. Compared to thioflavin-S, both noninvasive techniques correlated well (CE vs. MRI, r=0.79 vs. 0.91; p=NS). Microvascular obstruction size was unchanged at 2 and 9 days (CE: 13.23+/-4.11% vs. 12.69+/-4.97%; MRI: 5.53+/-4.94% vs. 4.68+/-3.44%; p=NS for both). CONCLUSIONS Both CE and MRI can quantify MO. Both correlate well with the histopathologic standards. While MRI can detect regions of MO with blood flow <40% of remote, the threshold for MO by CE is <60% remote. The extent of MO is unchanged at 2 and 9 days after reperfusion.
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Affiliation(s)
- K C Wu
- Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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Rochitte CE, Lima JA, Bluemke DA, Reeder SB, McVeigh ER, Furuta T, Becker LC, Melin JA. Magnitude and time course of microvascular obstruction and tissue injury after acute myocardial infarction. Circulation 1998; 98:1006-14. [PMID: 9737521 DOI: 10.1161/01.cir.98.10.1006] [Citation(s) in RCA: 362] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Microvascular obstruction within an area of myocardial infarction indicates worse functional recovery and a higher risk of postinfarction complications. After prolonged coronary occlusion, contrast-enhanced MRI identifies myocardial infarction as a hyperenhanced region containing a hypoenhanced core. Because the time course of microvascular obstruction after infarction/reperfusion is unknown, we examined whether microvascular obstruction reaches its full extent shortly after reperfusion or shows significant progression over the following 2 days. METHODS AND RESULTS Seven dogs underwent 90-minute balloon occlusion of the left anterior descending coronary artery (LAD) followed by reflow. Gadolinium-DTPA-enhanced MRI performed at 2, 6, and 48 hours after reperfusion was compared with radioactive microsphere blood flow (MBF) measurements and myocardial staining to define microvascular obstruction (thioflavin S) and infarct size (triphenyltetrazolium chloride, TTC). The MRI hypoenhanced region increased 3-fold during 48 hours after reperfusion (3.2+/-1.8%, 6.7+/-4.4%, and 9.9+/-3.2% of left ventricular mass at 2, 6, and 48 hours, respectively, P<0.03) and correlated well with microvascular obstruction (MBF <50% of remote region, r=0.99 and thioflavin S, r=0.93). MRI hyperenhancement also increased (21.7+/-4.0%, 24.3+/-4.6%, and 28.8+/-5.1% at 2, 6, and 48 hours, P<0.006) and correlated well with infarct size by TTC (r=0.92). The microvascular obstruction/infarct size ratio increased from 13.0+/-4.8% to 22.6+/-8.9% and to 30.4+/-4.2% over 48 hours (P=0.024). CONCLUSION The extent of microvascular obstruction and the infarct size increase significantly over the first 48 hours after myocardial infarction. These results are consistent with progressive microvascular and myocardial injury well beyond coronary occlusion and reflow.
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Affiliation(s)
- C E Rochitte
- Department of Medicine, Johns Hopkins University, Baltimore, MD, USA
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