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Sadighi M, Kara D, Mai D, Nguyen K, Chen S, Kwon D, Nguyen C. Cardiac DTI using short-axis PROPELLER: A feasibility study. Magn Reson Med 2024; 91:2546-2558. [PMID: 38376096 DOI: 10.1002/mrm.30020] [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: 09/15/2023] [Revised: 12/06/2023] [Accepted: 01/08/2024] [Indexed: 02/21/2024]
Abstract
PURPOSE We aimed to develop a free-breathing (FB) cardiac DTI (cDTI) method based on short-axis PROPELLER (SAP) and M2 motion compensated spin-echo EPI (SAP-M2-EPI) to mitigate geometric distortion and eliminate aliasing in acquired diffusion-weighted (DW) images, particularly in patients with a higher body mass index (BMI). THEORY AND METHODS The study involved 10 healthy volunteers whose BMI values fell into specific categories: BMI <25 (4 volunteers), 25< BMI <28 (5 volunteers), and BMI >30 (1 volunteer). We compared DTI parameters, including fractional anisotropy (FA), mean diffusivity (MD), and helix angle transmurality (HAT), between SAP-M2-EPI and M2-ssEPI. To evaluate the performance of SAP-M2-EPI in reducing geometric distortions in the left ventricle (LV) compared to CINE and M2-ssEPI, we utilized the DICE similarity coefficient (DSC) and assessed misregistration area. RESULTS In all volunteers, SAP-M2-EPI yielded high-quality LV DWIs without aliasing, demonstrating significantly reduced geometric distortion (with an average DSC of 0.92 and average misregistration area of 90 mm2) and diminished signal loss due to bulk motion when compared to M2-ssEPI. DTI parameter maps exhibited consistent patterns across slices without motion related artifacts. CONCLUSION SAP-M2-EPI facilitates free-breathing cDTI of the entire LV, effectively eliminating aliasing and minimizing geometric distortion compared to M2-ssEPI. Furthermore, it preserves accurate quantification of myocardial microstructure.
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Affiliation(s)
- Mehdi Sadighi
- Cardiovascular Innovation Research Center (CIRC), Heart, Vascular, and Thoracic Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Danielle Kara
- Cardiovascular Innovation Research Center (CIRC), Heart, Vascular, and Thoracic Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Dingheng Mai
- Cardiovascular Innovation Research Center (CIRC), Heart, Vascular, and Thoracic Institute, Cleveland Clinic, Cleveland, Ohio, USA
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Case Western Reserve University, Cleveland, Ohio, USA
| | - Khoi Nguyen
- Cardiovascular Innovation Research Center (CIRC), Heart, Vascular, and Thoracic Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Shi Chen
- Cardiovascular Innovation Research Center (CIRC), Heart, Vascular, and Thoracic Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Deborah Kwon
- Cardiovascular Innovation Research Center (CIRC), Heart, Vascular, and Thoracic Institute, Cleveland Clinic, Cleveland, Ohio, USA
- Imaging Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Christopher Nguyen
- Cardiovascular Innovation Research Center (CIRC), Heart, Vascular, and Thoracic Institute, Cleveland Clinic, Cleveland, Ohio, USA
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Case Western Reserve University, Cleveland, Ohio, USA
- Imaging Institute, Cleveland Clinic, Cleveland, Ohio, USA
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Oguchi Y, Rolle M, Mai D, Tsai-Brown C, Rott KH, Caviedes-Vidal E, Karasov WH. Macronutrient signals for adaptive modulation of intestinal digestive enzymes in two omnivorous Galliformes. Comp Biochem Physiol A Mol Integr Physiol 2022; 271:111243. [PMID: 35609804 DOI: 10.1016/j.cbpa.2022.111243] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Revised: 05/13/2022] [Accepted: 05/16/2022] [Indexed: 11/18/2022]
Abstract
According to the adaptive modulation hypothesis, digestive enzyme activities are matched to their respective dietary substrate level so that ingested nutrients are not wasted in excreta due to insufficient digestive capacity, and so membrane space or expenditures building/maintaining the intestinal hydrolytic machinery are not wasted when substrate levels are low. We tested predictions in juvenile northern bobwhites (Colinus virginianus) and juvenile and adult domestic chickens (Gallus gallus domesticus) by feeding them on diets varying in starch, protein, and lipid composition for 7-9 d (bobwhites) or 15 d (chickens). Birds were euthanized, intestinal tissue harvested, and enzyme activities measured in tissue homogenates from proximal, medial and distal small intestine. We found that (1) α-glucosidase (AG; maltase and sucrase) activities were induced by dietary starch in both juvenile and adult chickens but not in northern bobwhites; (2) aminopeptidase-N (APN) activities were induced by dietary protein in both bobwhites and juvenile but not adult chickens; (3) AG activities were suppressed by an increase in dietary lipid in both bobwhites and juvenile but not adult chickens; and (4) APN activities were not suppressed by high dietary lipid in any birds. We review findings from 35 analogous trials in 16 avian species. 100% of avian omnivores modulate at least one enzyme in response to change in dietary substrate level. AG induction by dietary carbohydrate occurs in more members of Galloanserae than in Neoaves, and all omnivorous members of Neoaves tested so far increase APN activity on high dietary protein, whereas fewer of the Galloanserae do.
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Affiliation(s)
- Y Oguchi
- University of Wisconsin-Madison, Department of Forest and Wildlife Ecology, Madison, WI 53706, United States.
| | - M Rolle
- University of Wisconsin-Madison, Department of Forest and Wildlife Ecology, Madison, WI 53706, United States.
| | - D Mai
- University of Wisconsin-Madison, Department of Forest and Wildlife Ecology, Madison, WI 53706, United States.
| | - C Tsai-Brown
- University of Wisconsin-Madison, Department of Forest and Wildlife Ecology, Madison, WI 53706, United States
| | - K H Rott
- University of Wisconsin-Madison, Department of Forest and Wildlife Ecology, Madison, WI 53706, United States
| | - E Caviedes-Vidal
- University of Wisconsin-Madison, Department of Forest and Wildlife Ecology, Madison, WI 53706, United States; Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto Multidisciplinario de Investigaciones Biológicas de San Luis, Consejo Nacional de Investigaciones Científicas y Técnicas, San Luis, 5700 San Luis, Argentina; Universidad de San Luis, Departamento de Biología, San Luis, 5700 San Luis, Argentina
| | - W H Karasov
- University of Wisconsin-Madison, Department of Forest and Wildlife Ecology, Madison, WI 53706, United States.
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Mai D, East S, Barandiaran J, Maude K, Peter M. Preventing unnecessary blood tests in general surgery patients in a district general hospital: A closed loop audit. Int J Surg 2018. [DOI: 10.1016/j.ijsu.2018.05.155] [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: 10/28/2022]
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Lee Ching C, Donath E, Sergeyenko Y, Mai D, Desai T, Shah A, Patel C, Kothadia S, Morrison R, Lee CC, Tappy E, Kumar S. THU0125 Drug Retention and Reasons for Drug Discontinuation of anti-TNF Therapy in Patients with Rheumatoid Arthritis. A Network Meta-Analysis. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2029] [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: 11/03/2022]
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Bräunlich J, Beyer D, Mai D, Seyfarth HJ, Hammerschmidt S, Wirtz H. Wirkung eines nasalen high-flow Systems (HFNC) auf die Atemdruckamplitude, den Atemmitteldruck, das Tidalvolumen und den pCO2 bei Patienten mit Lungenfibrose und COPD. Pneumologie 2011. [DOI: 10.1055/s-0031-1272276] [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: 10/18/2022]
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Affiliation(s)
- D Mai
- Unité de néonatologie, Rigshospitalet, Copenhague, Danemark
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Liu P, Henkelman M, Joshi J, Hardy P, Butany J, Iwanochko M, Clauberg M, Dhar M, Mai D, Waien S, Olivieri N. Quantification of cardiac and tissue iron by nuclear magnetic resonance relaxometry in a novel murine thalassemia-cardiac iron overload model. Can J Cardiol 1996; 12:155-64. [PMID: 8605637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
OBJECTIVE To determine whether nuclear magnetic resonance (NMR) relaxation parameters can be used to quantify iron in tissues, the relationship between NMR spectrometric T2 relaxation measurements and tissue iron concentration were verified in a novel murine cardiac iron overload model. METHODS Congenital heterozygous thalassemic mice and controls were injected with intraperitoneal iron or saline and were sacrificed at three weeks. Samples of liver, heart and peripheral muscle were subjected to NMR relaxation measurements and continuous distribution analysis. Tissue ferritin levels were determined with immunoadsorbance techniques, and elemental iron was assayed by flame atomic absorption. Tissues were analyzed pathologically with hematoxylin and eosin and Prussian blue staining to confirm the localization of iron. RESULTS This murine iron loading model was uniquely successful in loading iron into the major organs, especially the heart, and produced significant reductions in T1 and T2 NMR relaxation values. There was a good correlation between soluble ferritin and total iron levels (r=0.92), indicating that there is a constant and significant fraction of total iron present in ferritin irrespective of absolute iron concentrations. Regression analysis between total iron content and T2 relaxivity showed a linear relationship (r=0.96), suggesting that the T2 relaxation parameter is related to tissue iron concentration. The regression relationship suggested that NMR can detect iron levels as low as 0.1 mg/g of tissue. CONCLUSIONS Parenteral iron loading in mice produces unique iron overload in major organs, including the heart. Local iron deposition is detectable by NMR relaxometry at 0.1 mg/g or higher. There is a linear relationship between iron concentration and T2 relaxivity. Thus, NMR may be an important and useful clinical tool to quantify iron excess in various pathobiological states of human disease due to iron overload, including heart disease.
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Affiliation(s)
- P Liu
- Centre for Cardiovascular Research, Toronto Hospital, Ontario, Canada
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Schulof RS, Lloyd MJ, Stallings JJ, Mai D, Phillips TM, Jones GJ, Schechter GP. Recombinant leukocyte A interferon in B-cell chronic lymphocytic leukemia: in vivo effects on autologous antitumor immunity. J Biol Response Mod 1985; 4:310-23. [PMID: 3874930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Eight previously treated and four untreated patients with B cell chronic lymphocytic leukemia (CLL) received 20 X 10(6) U/m2 recombinant leukocyte interferon clone A (rIFN-alpha A) intramuscularly three times a week for 8 weeks. None of the eight patients who had received prior chemotherapy exhibited objective evidence of tumor regression. Two of the four previously untreated patients responded with transient (90%) decreases in absolute lymphocyte counts lasting for 2 and 7 months. Toxicity was moderate, with all patients experiencing a flu-like syndrome requiring a 50% dose reduction. Half of the patients exhibited anorexia, weight loss, and a drop in performance status. The two responders had normal serum immunoglobulin levels prior to treatment, whereas 80% of non-responders had depressed levels. Treatment with rIFN-alpha A was associated with a depression of nonspecific and specific humoral immunity in assays employing cryopreserved autologous pretherapy CLL cells. No consistent effects were demonstrable in cytolytic assays with purified peripheral blood T cells as effector cells, including one that utilized autologous CLL target cells. rIFN-alpha A has limited antitumor activity in B cell CLL which is restricted to untreated patients with an early stage of disease. With the assays employed it was not possible to demonstrate that rIFN-alpha A could augment autologous antitumor immunity.
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Mewe L, Jaring T, Mai D. [Investigations into the importance of the statutory accident insurance scheme for children and students in North-Rhine Westphalia on the basis of 2917 analyzed cases (author's transl)]. Klin Monbl Augenheilkd 1981; 178:399-407. [PMID: 7253533 DOI: 10.1055/s-2008-1057232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A review of the eye injuries recorded by a major statutory insurance corporation showed that eye injuries are the third most common type of injury, following surgical and neurosurgical cases. It was found that eye injuries have the lowest tendency to improve as expressed in terms of a modification of compensatory annuities.
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