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Monteiro H, Santiago MM, Machado RS, Barbosa S, Cruz I, Antunes D. Community Intervention Group – a 4 year inter-professional practice in a local health authority. Eur J Public Health 2015. [DOI: 10.1093/eurpub/ckv176.198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Barbosa S, Pilla G, Lacoste DA, Scouflaire P, Ducruix S, Laux CO, Veynante D. Influence of nanosecond repetitively pulsed discharges on the stability of a swirled propane/air burner representative of an aeronautical combustor. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2015; 373:rsta.2014.0335. [PMID: 26170424 PMCID: PMC4528429 DOI: 10.1098/rsta.2014.0335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/06/2015] [Indexed: 06/04/2023]
Abstract
This paper reports on an experimental study of the influence of a nanosecond repetitively pulsed spark discharge on the stability domain of a propane/air flame. This flame is produced in a lean premixed swirled combustor representative of an aeronautical combustion chamber. The lean extinction limits of the flame produced without and with plasma are determined and compared. It appears that only a low mean discharge power is necessary to increase the flame stability domain. Lastly, the effects of several parameters (pulse repetition frequency, global flowrate, electrode location) are studied.
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Barbosa SM, Lopes F, Correia AD, Barbosa S, Pereira AC, Neves LF. Temporal variability of radon in a remediated tailing of uranium ore processing--the case of Urgeiriça (central Portugal). JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2015; 142:14-23. [PMID: 25618233 DOI: 10.1016/j.jenvrad.2014.12.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Revised: 12/10/2014] [Accepted: 12/27/2014] [Indexed: 06/04/2023]
Abstract
Radon monitoring at different levels of the cover of the Urgeiriça tailings shows that the sealing is effective and performing as desired in terms of containing the strongly radioactive waste resulting from uranium ore processing. However, the analysis of the time series of radon concentration shows a very complex temporal structure, particularly at depth, including very large and fast variations from a few tens of kBq m(-3) to more than a million kBq m(-3) in less than one day. The diurnal variability is strongly asymmetric, peaking at 18 h/19 h and decreasing very fast around 21 h/22 h. The analysis is performed for summer and for a period with no rain in order to avoid the potential influence of precipitation and related environmental conditions on the radon variability. Analysis of ancillary measurements of temperature, relative humidity, wind speed and wind direction, as well as atmospheric pressure reanalysis data shows that the daily averaged radon concentration in the taillings material is anti-correlated with the atmospheric pressure and that the diurnal amplitude is associated with the magnitude of atmospheric pressure daily oscillations.
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Barbosa S, Cavaleiro P, Guedes J, Castro S, Granja C. End-of-life decisions: how do patients die in the ICU? Crit Care 2015. [PMCID: PMC4472727 DOI: 10.1186/cc14648] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Villar-Alvarez E, Figueroa-Ochoa E, Barbosa S, Soltero JFA, Taboada P, Mosquera V. Reverse poly(butylene oxide)–poly(ethylene oxide)–poly(butylene oxide) block copolymers with lengthy hydrophilic blocks as efficient single and dual drug-loaded nanocarriers with synergistic toxic effects on cancer cells. RSC Adv 2015. [DOI: 10.1039/c5ra07296d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Reverse triblock copolymer micelles with lengthy polyethylene oxide blocks as efficient sustained dual drug-loaded nanocarriers.
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Cavalcanti PP, Rodrigues LCA, Beijo LA, Barbosa S, Xavier TT, Magalhães F. Contamination from an affluent of Furnas reservoir by trace metals. BRAZ J BIOL 2014; 74:877-85. [DOI: 10.1590/1519-6984.07013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 06/11/2013] [Indexed: 11/22/2022] Open
Abstract
This study aims to determine concentrations and characterize trace metals distribution in an affluent of Furnas reservoir, Alfenas-MG. Water and sediment samples were taken monthly, 2010/10-2011/07 in five sites of Córrego do Pântano for subsequent determination of Pb, Cd and Zn levels by chemical analysis. The stream studied is in disagreement with Brazilian legislation for Class II water bodies (CONAMA 357). The highlights are the unsuitable concentrations of Pb for human consumption, according to Ministry of Health 2914 decree, providing risk for population.
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Tavares K, Caloto-Oliveira Á, Vicentini D, Melegari S, Matias W, Barbosa S, Kummrow F. Acute toxicity of copper and chromium oxide nanoparticles to Daphnia similis. ACTA ACUST UNITED AC 2014. [DOI: 10.5132/eec.2014.01.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Pereira R, Barbosa S, Carvalho FP. Uranium mining in Portugal: a review of the environmental legacies of the largest mines and environmental and human health impacts. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2014; 36:285-301. [PMID: 24030454 DOI: 10.1007/s10653-013-9563-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2012] [Accepted: 07/17/2013] [Indexed: 06/02/2023]
Abstract
The history of uranium mining in Portugal during almost one century has followed international demand peaks of both radium and uranium, which in turn were driven by medical, military, and civil applications. Nowadays, following price drop in the 1980s, mining activities decreased and ceased in 2001. The current challenge is to deal with environmental legacies left by old uranium mines, mainly located in Viseu and Guarda districts. In 2001, based on several radiological surveys carried out, the Portuguese government assumed the remediation costs of abandoned mine areas for environmental safety and public health protection. Detailed environmental and public health risk assessments were performed under the scope of studies both requested by the government and by funded research projects. It was found that the existing risks, due to radiological and chemical exposures to metals and radionuclide's, were particularly high at the old milling facilities and mines where in situ and heap leaching of low-grade ore occurred. The different studies, involving both humans and non-human species from different trophic levels, demonstrated the existence of effects at different levels of biological organization (molecular, cellular, tissues, individuals, and populations) and on ecosystem services. To mitigate the risks, the environmental rehabilitation works at the Urgeiriça mine complex are almost complete, while at Cunha Baixa mine, they are presently in progress. These works and environmental improvements achieved and expected are described herein.
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Junza A, Barbosa S, Codony MR, Jubert A, Barbosa J, Barrón D. Identification of metabolites and thermal transformation products of quinolones in raw cow's milk by liquid chromatography coupled to high-resolution mass spectrometry. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:2008-2021. [PMID: 24499328 DOI: 10.1021/jf405554z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The presence of residues of antibiotics, metabolites, and thermal transformation products (TPs), produced during thermal treatment to eliminate pathogenic microorganisms in milk, could represent a risk for people. Cow's milk samples spiked with enrofloxacin (ENR), ciprofloxacin (CIP), difloxacin (DIF), and sarafloxacin (SAR) and milk samples from cows medicated with ENR were submitted to several thermal treatments. The milk samples were analyzed by liquid chromatography-mass spectrometry (LC-MS) to find and identify TPs and metabolites. In this work, 27 TPs of 4 quinolones and 24 metabolites of ENR were found. Some of these compounds had been reported previously, but others were characterized for the first time, including lactose-conjugated CIP, the formamidation reaction for CIP and SAR, and hydroxylation or ketone formation to produce three different isomers for all quinolones studied.
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Topete A, Melgar D, Alatorre-Meda M, Iglesias P, Argibay B, Vidawati S, Barbosa S, Costoya JA, Taboada P, Mosquera V. NIR-light active hybrid nanoparticles for combined imaging and bimodal therapy of cancerous cells. J Mater Chem B 2014; 2:6967-6977. [DOI: 10.1039/c4tb01273a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Multifunctional hybrid polymeric-based nanoplatforms for simultaneous fluorescence and magnetic resonance imaging and multimodal chemo- and phothermal therapies.
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Taboada P, Barbosa S, Concheiro A, Alvarez-Lorenzo C. CHAPTER 5. Polymeric Micelles. SOFT NANOPARTICLES FOR BIOMEDICAL APPLICATIONS 2014. [DOI: 10.1039/9781782625216-00157] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Falkner I, Barbosa S, Byrne M. Reproductive biology of four ophiocomid ophiuroids in tropical and temperate Australia – reproductive cycle and oogenic strategies in species with different modes of development. INVERTEBR REPROD DEV 2013. [DOI: 10.1080/07924259.2012.721402] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Cambón A, Brea J, Loza MI, Alvarez-Lorenzo C, Concheiro A, Barbosa S, Taboada P, Mosquera V. Cytocompatibility and P-glycoprotein inhibition of block copolymers: structure-activity relationship. Mol Pharm 2013; 10:3232-41. [PMID: 23763603 DOI: 10.1021/mp4002848] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Amphiphilic polymeric micelles greatly improve the solubilization and sustained release of hydrophobic drugs and provide a protective environment for the cargo molecules in aqueous media, which favors lower drug administration doses, reduces adverse side effects, and increases blood circulation times and passive targeting to specific cells. These capabilities depend, among other variables, on the structure and composition of the polymer chains. Composition and, in particular, block length have been shown to play an important role in the modification of cellular responses such as drug internalization processes or transduction pathways when polymeric unimer/micelles are in close contact with cells. Here we present a detailed study about the role copolymer structure and composition play on cell viability and cellular response of several cell lines. To do that, more than 30 structurally related copolymers with diblock and triblock architectures containing different hydrophobic blocks and poly(ethylene oxide) as the common hydrophilic unit have been analyzed regarding cytocompatibility and potential as "active" cell response modifiers by testing their influence on the P-gp pump efflux mechanism responsible of multidrug resistance in cancerous cells. An empirical threshold for cell viability could be established at a copolymer EO/POeffective value above ca. 1.5 for copolymers with triblock structure, whereas no empirical rule could be observed for diblocks. Moreover, some of the tested copolymers (e.g., BO12EO227BO12 and EO57PO46EO57 that notably increased and C16EO455C16 that decreased the P-gp ATPase activity) were observed to act as efficient inhibitors of the P-gp efflux pump promoting an enhanced doxorubicin (DOXO) accumulation inside multidrug resistant (MDR) NCI-ADR-RES cells.
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Barbosa S, de Sá RAM, Coca Velarde LG. Diastasis of rectus abdominis in the immediate puerperium: correlation between imaging diagnosis and clinical examination. Arch Gynecol Obstet 2013; 288:299-303. [PMID: 23435798 DOI: 10.1007/s00404-013-2725-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Accepted: 01/15/2013] [Indexed: 10/27/2022]
Abstract
AIM Diastasis of rectus abdominis is a condition defined as a separation between this muscle and the linea alba, which leads to weakness in the abdominal muscles. Later, such weakness will influence the biomechanical posture causing back pain in women. In the present study, our aim was to assess the accuracy of clinical examination in measuring diastasis of rectus abdominis in the postpartum period. METHOD Puerperal women (n=106) were selected for this study, including caesarean delivery (62 %) and vaginal delivery (38 %). Diastasis of rectus abdominis was measured in the postpartum period using clinical examination and ultrasonography, at four levels of the anterior sheath of the rectus abdominis, in the region above the umbilical scar. RESULTS At each level of measurement, the results were statistically analyzed using the Student's t and Pearson tests (confidence interval 95 %), Bland-Altman plot, and Kappa test. The Student t test showed no significant difference between clinical examination and ultrasonography. The Pearson test showed correlation with positive coefficients; moderate correlation (r > 0.5) in the first levels (3, 6, and 9 cm) and a strong correlation (r > 0.75) in the last level (12 cm). In the Kappa test, 65 % of diagnoses given in the clinical examination were confirmed by ultrasonography. CONCLUSIONS These results show a good agreement between both forms of examination, allowing clinical examination to be used in the diagnosis of rectus muscle diastasis, when ultrasonography is not available.
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Cambón A, Rey-Rico A, Mistry D, Brea J, Loza MI, Attwood D, Barbosa S, Alvarez-Lorenzo C, Concheiro A, Taboada P, Mosquera V. Doxorubicin-loaded micelles of reverse poly(butylene oxide)-poly(ethylene oxide)-poly(butylene oxide) block copolymers as efficient "active" chemotherapeutic agents. Int J Pharm 2013; 445:47-57. [PMID: 23380628 DOI: 10.1016/j.ijpharm.2013.01.056] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Accepted: 01/24/2013] [Indexed: 12/31/2022]
Abstract
Five reverse poly(butylene oxide)-poly(ethylene oxide)-poly(butylene oxide) block copolymers, BOnEOmBOn, with BO ranging from 8 to 21 units and EO from 90 to 411 were synthesized and evaluated as efficient chemotherapeutic drug delivery nanocarriers and inhibitors of the P-glycoprotein (P-gp) efflux pump in a multidrug resistant (MDR) cell line. The copolymers were obtained by reverse polymerization of poly(butylene oxide), which avoids transfer reaction and widening of the EO block distribution, commonly found in commercial poly(ethylene oxide)-poly(propylene oxide) block copolymers (poloxamers). BOnEOmBOn copolymers formed spherical micelles of 10-40 nm diameter at lower concentrations (one order of magnitude) than those of equivalent poloxamers. The influence of copolymer block lengths and BO/EO ratios on the solubilization capacity and protective environment for doxorubicin (DOXO) was investigated. Micelles showed drug loading capacity ranging from ca. 0.04% to 1.5%, more than 150 times the aqueous solubility of DOXO, and protected the cargo from hydrolysis for more than a month due to their greater colloidal stability in solution. Drug release profiles at various pHs, and the cytocompatibility and cytotoxicity of the DOXO-loaded micelles were assessed in vitro. DOXO loaded in the polymeric micelles accumulated more slowly inside the cells than free DOXO due to its sustained release. All copolymers were found to be cytocompatible, with viability extents larger than 95%. In addition, the cytotoxicity of DOXO-loaded micelles was higher than that observed for free drug solutions in a MDR ovarian NCI-ADR-RES cell line which overexpressed P-gp. The inhibition of the P-gp efflux pump by some BOnEOmBOn copolymers, similar to that measured for the common P-gp inhibitor verapamil, favored the retention of DOXO inside the cell increasing its cytotoxic activity. Therefore, poly(butylene oxide)-poly(ethylene oxide) block copolymers offer interesting features as cell response modifiers to complement their role as efficient nanocarriers for cancer chemotherapy.
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Barbosa S, Pauperio J, Searle JB, Alves PC. Genetic identification of Iberian rodent species using both mitochondrial and nuclear loci: application to noninvasive sampling. Mol Ecol Resour 2012; 13:43-56. [PMID: 23095787 DOI: 10.1111/1755-0998.12024] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 08/10/2012] [Accepted: 08/16/2012] [Indexed: 11/29/2022]
Abstract
Species identification through noninvasive sampling is increasingly used in animal conservation genetics, given that it obviates the need to handle free-living individuals. Noninvasive sampling is particularly valuable for elusive and small species such as rodents. Although rodents are not usually assumed to be the most obvious target for conservation, of the 21 species or near-species present in Iberia, three are considered endangered and declining, while several others are poorly studied. Here, we develop a genetic tool for identifying all rodent species in Iberia by noninvasive genetic sampling. To achieve this purpose, we selected one mitochondrial gene [cytochrome b (cyt-b)] and one nuclear gene [interphotoreceptor retinoid-binding protein (IRBP)], which we first sequenced using tissue samples. Both genes allow for the phylogenetic distinction of all species except the sibling species Microtus lusitanicus and Microtus duodecimcostatus. Overall, cyt-b showed higher resolution than IRBP, revealing a clear barcoding gap. To allow these markers to be applied to noninvasive samples, we selected a short highly diagnostic fragment from each gene, which we used to obtain sequences from faeces and bones from owl pellets. Amplification success for the cyt-b and IRBP fragment was 85% and 43% in faecal and 88% and 64% in owl-pellet DNA extractions, respectively. The method allows the unambiguous identification of the great majority of Iberian rodent species from noninvasive samples, with application in studies of distribution, spatial ecology and population dynamics, and for conservation.
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Gomes L, Silva F, Barbosa S, Kummrow F. Ecotoxicity of Sludges Generated by Textile Industries: a Review. ACTA ACUST UNITED AC 2012. [DOI: 10.5132/jbse.2012.01.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Fernández-Blanco JA, Barbosa S, Sánchez de Medina F, Martínez V, Vergara P. Persistent epithelial barrier alterations in a rat model of postinfectious gut dysfunction. Neurogastroenterol Motil 2011; 23:e523-33. [PMID: 21895877 DOI: 10.1111/j.1365-2982.2011.01777.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
BACKGROUND Mucosal mast cells (MMCs), epithelial barrier function (EBF) and the enteric nervous system (ENS) are interactive factors in the pathophysiology of functional gastrointestinal disorders. We characterized postinfectious EBF alterations in the Trichinella spiralis infection model of MMC-dependent intestinal dysfunction in rats. METHODS Sprague-Dawley rats were infected with T. spiralis. 30 ± 2 days postinfection, jejunal EBF (electrophysiological parameters, fluorescein isothiocyanate-dextran fluxes and responses to secretagogues and MMC degranulators) was evaluated (Ussing chamber). In some experiments, participation of secretomotor neurons was examined by tetrodotoxin (TTX) pretreatment. Jejunal histology and MMC count and activity were also assessed. KEY RESULTS 30 ± 2 days postinfection, when only a low grade inflammation was observed, increased MMC number and activity were associated with altered EBF. EBF alterations were characterized by increased mucosal permeability and ion secretion. In T. spiralis-infected animals, secretory responses to serotonin (5-HT) and immunoglobulin E (IgE)-dependent activation of MMCs were reduced. In contrast, responses to substance P (SP) and capsaicin were similar in infected and noninfected animals. Neuronal blockade with TTX altered secretory responses to SP and capsaicin only in infected rats. CONCLUSIONS & INFERENCES Trichinella spiralis infection in rats, at late stages, results in persistent postinfectious intestinal barrier dysfunctions and mucosal mastocytosis, with other signs suggestive of a low grade inflammation. The altered permeability and the TTX-independent hyporesponsiveness to 5-HT and IgE indicate epithelial alterations. Changes in responses to SP and capsaicin after neuronal blockade suggest an ENS remodeling during this phase. Similar long-lasting neuro-epithelial alterations might contribute to the pathophysiology of functional and postinfectious gastrointestinal disorders.
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Anglade I, Fabre N, Tapia E, Bielsa C, Nadal T, Barbosa S, Vergara P, Vericat J. Effects on gastrointestinal tract after the short-term administration of an iron chelating compound. Toxicol Lett 2011. [DOI: 10.1016/j.toxlet.2011.05.824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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La Tegola S, Terenzi A, Martini R, Barbosa S, Torre L, Kenny J. Processing and Final Properties Improvement of Polyolefin-Sepiolite and Carbon Nanofibre Nanocomposites. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.201150316] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Benito J, Barbosa S, Cabello F, Vergara P, Fabre N, Nadal T, Vericat J, Montero OM, Moreno MPDLC, Cantó J, Martinez V. Characterization of exacerbated anticholinesterasic-related pharmacological effects in female rats treated with NP0361. An activity of the Melius project. Toxicol Lett 2010. [DOI: 10.1016/j.toxlet.2010.03.888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Silva O, Barbosa S, Diniz A, Valdeira ML, Gomes E. Plant Extracts Antiviral Activity against Herpes simplex Virus Type 1 and African Swine Fever Virus. ACTA ACUST UNITED AC 2008. [DOI: 10.1076/phbi.35.1.12.13264] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Cheema§ MA, Taboada P, Barbosa S, Siddiq M, Mosquera V. Effect of molecular structure on the hydration of structurally related antidepressant drugs. Mol Phys 2006. [DOI: 10.1080/00268970601070460] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Padilla W, Newton HB, Barbosa S. Weber's syndrome and sixth nerve palsy secondary to decompression illness: a case report. Undersea Hyperb Med 2005; 32:95-101. [PMID: 15926301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
We describe the first case of Weber's Syndrome to present as a manifestation of decompression illness in a recreational scuba diver. Weber's Syndrome is characterized by the presence of an oculomotor nerve palsy and contralateral hemiparesis. The patient was a 55 year-old male with a past medical history of a pulmonary cyst, in whom symptoms developed after a multilevel drift dive to a depth of 89 feet for 53 minutes, exceeding no-decompression limits. Symptom onset was within 30 minutes of surfacing and included the Weber's Syndrome, a sixth nerve palsy, dizziness, nausea, sensory loss, and ataxia. The patient received four U.S. Navy Treatment Tables with complete resolution of all neurological signs and symptoms. The mechanism of injury remains unclear, but may involve aspects of both air gas embolism and decompression sickness. Individuals with pre-existing pulmonary cysts may be at increased risk for dive-related complications.
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Redmond IT, Barbosa S, Blumhardt LD, Roberts N. Short-term ventricular volume changes on serial MRI in multiple sclerosis. Acta Neurol Scand 2000; 102:99-105. [PMID: 10949526 DOI: 10.1034/j.1600-0404.2000.102002099.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Axonal loss is likely to be an important component of atrophy and the pathological substrate for the fixed disability of MS. To estimate the rate of central white matter reduction we investigated ventricular volume change and disease activity on monthly MRI in 19 patients over 6 months. At baseline, ventricular volumes were largest in primary progressive MS and smallest in relapsing-remitting MS. Over the study period ventricular volumes increased overall by 0.2% (F= 2.75, P = 0.02), but the percentage changes in relapsing-remitting MS were much larger (median increase 14.9%). Lesion volumes were also highest at baseline in relapsing-remitting MS, but serial changes in ventricular volumes were not correlated with serial changes in lesions. This study shows that ventricular enlargement in MS may occur over short epochs, particularly in relapsing-remitting cases. However, the loss of central white matter volume observed in any brief period may be related to inflammatory activity that occurred in a preceding or earlier epoch, a delayed post-inflammatory degenerative process, or most likely, a combination of both.
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