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1.
Rev Neurol (Paris) ; 177(3): 302-311, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32798053

RESUMO

BACKGROUND: Alexithymia, meaning no words for emotions is a common problem that could affect up to 53% of patients in multiple sclerosis (MS). OBJECTIVES: To determine the frequency of alexithymia in MS and investigate MS-related abnormalities in structural magnetic resonance imaging (MRI) and their associations with fatigue and cognitive functions. METHODS: Ninety-five patients at all stages of the disease were examined: 21 with clinically isolated syndromes (CIS), 30 with relapsing-remitting MS (RRMS), 21 with primary (PP) and 23 with secondary progressive MS (SPMS). Alexithymia was measured with the Toronto alexithymia scale (TAS-20) and correlated to cognitive functions, depression, and fatigue. Voxel-based morphometry MRI was analyzed to determine lesion load, cerebral and regional atrophy. RESULTS: Fifty-seven of patients had alexithymia with no significant difference between the clinical phenotypes. Alexithymic patients differed from non-alexithymic patients on fatigue, depression and information processing speed. Compared to non-alexithymic patients, alexithymic patients had decreased volumes of cerebral and cerebellar white matter and there was a significant relationship between alexithymia and decreased brainstem, thalamic and corpus callosum volume. CONCLUSION: Regardless of the phenotype of MS, alexithymia is associated with atrophy of cerebral and cerebellar white matter, brainstem, corpus callosum, and thalami.


Assuntos
Sintomas Afetivos , Esclerose Múltipla , Atrofia , Encéfalo/patologia , Humanos , Imageamento por Ressonância Magnética , Esclerose Múltipla/patologia , Substância Branca
2.
J Neurovirol ; 23(2): 216-225, 2017 04.
Artigo em Inglês | MEDLINE | ID: mdl-27815816

RESUMO

Persistent immune activation is one of the suspected causes of HIV-associated neurocognitive disorders (HAND) in cART era. The CD4/CD8 ratio has been recently showed as a marker of immune activation and HAND. Our aim was to analyze if a decrease in the CD4/CD8 ratio over time could have an impact on neurocognitive deterioration. Randomly selected HIV-infected patients were followed for neuropsychological (NP) testing during a period of almost 2 years. Tests were adjusted for age, gender, and education. Patients were divided into 5 groups: normal tests (NT), neuropsychological deficit (ND, one impaired cognitive domain), asymptomatic neurocognitive disorders (ANI), mild neurocognitive disorders (MND), and HIV-associated dementia (HAD). Risk factors for neurocognitive deterioration were analyzed. Two hundred fifty-six patients underwent NP tests and 94 participated in the follow-up. The groups were comparable. Upon neuropsychological re-testing, six patients showed clinical improvement, 30 had worsened, and 58 were stable, resulting in 42 patients presenting with HAND (45 %). The majority of HAND cases consisted of ANI (26 %) and MND (16 %). In patients whose NP performance worsened, CPE 2010 score was lower at inclusion (7.13 vs 8.00, p = 0.003) and CD4/CD8 decrease more frequent (60 vs 31 %, p = 0.008) than in those who were stable or improved. Multivariate analysis confirmed these results. A decreasing CD4/CD8 ratio during a longitudinal follow-up of randomly selected HIV-infected patients and lower CSF-penetrating regimens were independently associated with cognitive decline. Monitoring trends in CD4/CD8 ratio could contribute to identifying patients at higher risk of neurocognitive deterioration.


Assuntos
Complexo AIDS Demência/imunologia , Antivirais/farmacocinética , Linfócitos T CD4-Positivos/imunologia , Linfócitos T CD8-Positivos/imunologia , Disfunção Cognitiva/imunologia , HIV/fisiologia , Complexo AIDS Demência/diagnóstico , Complexo AIDS Demência/patologia , Complexo AIDS Demência/virologia , Adulto , Terapia Antirretroviral de Alta Atividade , Antivirais/administração & dosagem , Biomarcadores/análise , Contagem de Linfócito CD4 , Relação CD4-CD8 , Linfócitos T CD4-Positivos/virologia , Linfócitos T CD8-Positivos/virologia , Disfunção Cognitiva/diagnóstico , Disfunção Cognitiva/patologia , Disfunção Cognitiva/virologia , Feminino , HIV/patogenicidade , Humanos , Masculino , Pessoa de Meia-Idade , Análise Multivariada , Testes Neuropsicológicos , Permeabilidade , Estudos Retrospectivos , Fatores de Risco , Índice de Gravidade de Doença , Replicação Viral
4.
Rev Neurol (Paris) ; 170(8-9): 527-30, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-24947487

RESUMO

The commonly used test to evaluate naming ability in multiple sclerosis (MS) is the Boston Naming Test (BNT). In previous studies the BNP has not shown any specific deficit in MS patients. The BNT score is obtained by adding spontaneously correct answers to correct answers obtained after semantic and phonological clues are given. Our hypothesis was that due to a lexical access deficit based on executive dysfunction, MS patients would need more clues than control subjects to normalize their performances,. Fifteen relapsing-remitting (RR) and 17 secondary progressive (SP) MS patients, and 32 controls matched for sex, age, and educational level, took the BNT. The 32 MS patients also took the BCCog (Short French battery used in MS to evaluate cognitive functions) in order to evaluate their executive functions. MS patients needed significantly more clues than matched controls to normalize their performances (P<0.001). This lexical access deficit was more frequent in the SP than in the RR group (P<0.05). A lexical access deficit inducing a denomination problem has thus been shown in MS patients. Further research should aim to better evaluate the executive functions of patients with a lexical access deficit.


Assuntos
Transtornos da Linguagem/etiologia , Esclerose Múltipla Recidivante-Remitente/complicações , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Adulto Jovem
5.
Sci Rep ; 14(1): 12198, 2024 05 28.
Artigo em Inglês | MEDLINE | ID: mdl-38806580

RESUMO

The objective of our work was to evaluate the screening of hepatic fibrosis in primary care using the FIB-4 score, automatically calculated. When the FIB-4 was ≥ 1.3, it was defined as positive, and ELF Test was performed. FIB-4 positivity was confirmed when ELF Test was ≥ 9.8 indicating an advanced fibrosis. Among the 3427 patients included, 869 (25%) had a positive FIB-4 score, 784 (22.5%) at intermediate (FIB-4: 1.3-2.67), and 85 (2.5%) at high risk of fibrosis (FIB-4 > 2.67). 509 (59%) of the FIB-4 positive were confirmed by the ELF Test. The percentage of confirmation was significantly higher in patients over 65 years (83 vs. 57%), with FIB-4 > 2.67 (80 vs. 56%), BMI > 25 (47 vs. 37%), and diabetes (24 vs. 14%), p = 0.001). In patients without known liver disease (92%), the practitioner identified a cause of disease in 27% of cases: mainly NAFLD and alcohol. Liver fibrosis was suspected on FIB-4 in 25% of patients in primary care. The ELF Test, performed as a second-line, improves the screening of liver fibrosis, particularly for FIB-4 intermediate results. A positive FIB-4 test allows physicians to recognize a liver disease, providing an opportunity for timely intervention.Clinical trial registration: Comité de protection des personnes du sud-ouest et outre-mer SI18.00832.201865-MS04-IDRCB 2018-A01571-54.


Assuntos
Cirrose Hepática , Atenção Primária à Saúde , Humanos , Feminino , Masculino , Pessoa de Meia-Idade , Cirrose Hepática/diagnóstico , Idoso , Programas de Rastreamento/métodos , Adulto , Hepatopatias/diagnóstico , Hepatopatia Gordurosa não Alcoólica/diagnóstico , Fatores de Risco
6.
Mol Ecol ; 22(4): 1092-104, 2013 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-23189975

RESUMO

Genetic diversity of contemporary domesticated species is shaped by both natural and human-driven processes. However, until now, little is known about how domestication has imprinted the variation of fruit tree species. In this study, we reconstruct the recent evolutionary history of the domesticated almond tree, Prunus dulcis, around the Mediterranean basin, using a combination of nuclear and chloroplast microsatellites [i.e. simple sequence repeat (SSRs)] to investigate patterns of genetic diversity. Whereas conservative chloroplast SSRs show a widespread haplotype and rare locally distributed variants, nuclear SSRs show a pattern of isolation by distance with clines of diversity from the East to the West of the Mediterranean basin, while Bayesian genetic clustering reveals a substantial longitudinal genetic structure. Both kinds of markers thus support a single domestication event, in the eastern side of the Mediterranean basin. In addition, model-based estimation of the timing of genetic divergence among those clusters is estimated sometime during the Holocene, a result that is compatible with human-mediated dispersal of almond tree out of its centre of origin. Still, the detection of region-specific alleles suggests that gene flow from relictual wild preglacial populations (in North Africa) or from wild counterparts (in the Near East) could account for a fraction of the diversity observed.


Assuntos
Evolução Molecular , Variação Genética , Prunus/genética , Teorema de Bayes , Análise por Conglomerados , DNA de Cloroplastos/genética , DNA de Plantas/genética , Haplótipos , Região do Mediterrâneo , Repetições de Microssatélites , Modelos Genéticos , Filogeografia , Análise de Sequência de DNA
7.
Mol Phylogenet Evol ; 69(1): 4-16, 2013 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-23707702

RESUMO

S100 proteins are calcium-binding proteins involved in controlling diverse intracellular and extracellular processes such as cell growth, differentiation, and antimicrobial function. We recently identified a S100-like cDNA from the tammar wallaby (Macropus eugenii) stomach. Phylogentic analysis shows wallaby S100A19 forms a new clade with other marsupial and monotreme S100A19, while this group shows similarity to eutherian S100A7 and S100A15 genes. This is also supported by amino acid and domain comparisons. We show S100A19 is developmentally-regulated in the tammar wallaby gut by demonstrating the gene is expressed in the forestomach of young animals at a time when the diet consists of only milk, but is absent in older animals when the diet is supplemented with herbage. During this transition the forestomach phenotype changes from a gastric stomach into a fermentation sac and intestinal flora changes with diet. We also show that S100A19 is expressed in the mammary gland of the tammar wallaby only during specific stages of lactation; the gene is up-regulated during pregnancy and involution and not expressed during the milk production phase of lactation. Comparison of the tammar wallaby S100A19 protein sequence with S100 protein sequences from eutherian, monotreme and other marsupial species suggest the marsupial S100A19 has two functional EF hand domains, and an extended His tail. An evolutionary analysis of S100 family proteins was carried out to gain a better understanding of the relationship between the S100 family member functions. We propose that S100A19 gene/protein is the ancestor of the eutherian S100A7 gene/protein, which has subsequently modified its original function in eutherians. This modified function may have arisen due to differentiation of evolutionary pressures placed on gut and mammary gland developmental during mammal evolution. The highly regulated differential expression patterns of S100A19 in the tammar wallaby suggests that S100A19 may play a role in gut development, which differs between metatherians and eutherians, and/or include a potential antibacterial role in order to establish the correct flora and protect against spiral bacteria in the immature forestomach. In the mammary gland it may protect the tissue from infection at times of vulnerability during the lactation cycle.


Assuntos
Evolução Molecular , Marsupiais/genética , Filogenia , Isoformas de Proteínas/genética , Proteínas S100/genética , Sequência de Aminoácidos , Animais , Sequência de Bases , DNA Complementar/genética , DNA Complementar/metabolismo , Feminino , Mucosa Gástrica/metabolismo , Regulação da Expressão Gênica no Desenvolvimento , Humanos , Lactação/fisiologia , Macropodidae/classificação , Macropodidae/genética , Macropodidae/metabolismo , Glândulas Mamárias Humanas/crescimento & desenvolvimento , Glândulas Mamárias Humanas/metabolismo , Marsupiais/classificação , Marsupiais/metabolismo , Dados de Sequência Molecular , Gravidez , Isoformas de Proteínas/classificação , Isoformas de Proteínas/metabolismo , Estrutura Terciária de Proteína , Proteínas S100/classificação , Proteínas S100/metabolismo , Análise de Sequência de DNA , Estômago/crescimento & desenvolvimento
8.
Br J Anaesth ; 106(6): 856-64, 2011 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-21525016

RESUMO

BACKGROUND: Dynamic variables are accurate predictors of fluid responsiveness in adults undergoing mechanical ventilation. They can be determined using respiratory variation in aortic flow peak velocity (▵Vpeak), arterial pulse pressure [▵PP and pulse pressure variation (PPV)], or plethysmographic waveform amplitude [▵POP and pleth variability index (PVI)]. These indices have not been validated in children. We studied the ability of these variables to predict fluid responsiveness in mechanically ventilated children. METHODS: All results are expressed as median [median absolute deviation (MAD)]. Thirty mechanically ventilated children were studied after undergoing general anaesthesia. Mechanical ventilation was maintained with a tidal volume of 10 ml kg(-1) of body weight. ▵PP, PPV, ▵POP, PVI, ▵Vpeak, and aortic velocity-time integral were recorded before and after volume expansion (VE). Patients were considered to be responders to VE when the aortic velocity-time integral increased more than 15% after VE. RESULTS: VE induced significant changes in ▵PP [13 (MAD 4) to 9 (5)%], PPV [15 (5) to 9 (5)%], ▵POP [15 (10) to 10 (6)%], PVI [13 (6) to 8 (5)%], and ▵Vpeak [16 (9) to 8 (3)%] (P<0.05 for all). Differences in ▵PP, ▵POP, PPV, and PVI did not reach statistical significance. Only ▵Vpeak was significantly different between responders (R) and non-responders (NR) to VE [22 (3) vs 7 (1)%, respectively; P<0.001]. The threshold ▵Vpeak value of 10% allowed discrimination between R and NR. CONCLUSIONS: In this study, ▵Vpeak was the most appropriate variable to predict fluid responsiveness.


Assuntos
Anestesia Geral/métodos , Hidratação/métodos , Monitorização Intraoperatória/métodos , Respiração Artificial/métodos , Adolescente , Aorta/diagnóstico por imagem , Aorta/fisiopatologia , Velocidade do Fluxo Sanguíneo/fisiologia , Pressão Sanguínea/fisiologia , Criança , Pré-Escolar , Feminino , Hemodinâmica/fisiologia , Humanos , Lactente , Recém-Nascido , Cuidados Intraoperatórios/métodos , Masculino , Pletismografia/métodos , Ultrassonografia
9.
Neurochirurgie ; 67(5): 420-426, 2021 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-33845115

RESUMO

OBJECTIVES: We investigated changes of impulsivity after deep brain stimulation (DBS) of the subthalamic nucleus (STN) in Parkinson's disease (PD) patients, distinguishing functional from dysfunctional impulsivity and their contributing factors. METHODS: Data of 33 PD patients treated by STN-DBS were studied before and 6 months after surgery: motor impairment, medication (dose and dopaminergic agonists), cognition, mood and occurrence of impulse control disorders. Impulsivity was assessed by the Dickman Impulsivity Inventory, which distinguishes functional impulsivity (FI), reflecting the potential for reasoning and rapid action when the situation requires it, and dysfunctional impulsivity (DI), reflecting the lack of prior reasoning, even when the situation demands it. The location of DBS leads was studied on postoperative MRI using a deformable histological atlas and by compartmentalization of the STN. RESULTS: After STN-DBS, DI was significantly increased (mean pre- and postoperative DI scores 1.9±1.6 and 3.5±2.4, P<0.001) although FI was not modified (mean pre- and postoperative FI scores 6.2±2.7 and 5.8±2.6). Factors associated with a DI score's increase≥2 (multivariable logistic regression model) were: low preoperative Frontal Assessment Battery score and location of the left active contact in the ventral part of the STN. CONCLUSION: Our study suggests that STN-DBS may have a different impact on both dimensions of impulsivity, worsening pathological impulsivity without altering physiological impulsivity. The increase in dysfunctional impulsivity may be favoured by the location of the electrode in the ventral part of the STN.


Assuntos
Estimulação Encefálica Profunda , Transtornos Disruptivos, de Controle do Impulso e da Conduta , Doença de Parkinson , Núcleo Subtalâmico , Humanos , Comportamento Impulsivo , Doença de Parkinson/terapia
10.
Mult Scler Relat Disord ; 44: 102374, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32652509

RESUMO

BACKGROUND: Recent studies highlight the central role of thalamic atrophy in Multiple Sclerosis (MS) related disorders. Behavioural aspects of (MS) are rarely explored but their investigation is of high interest. Dickman's Impulsiveness Inventory (DII) allows distinguishing functional impulsivity (FI) which is the ability to react fast and properly when necessary, from dysfunctional impulsivity (DI) which is a behavioural symptom corresponding to the tendency to miss forethought before acting. OBJECTIVE: This paper aims to explore whether MS patients show significantly high and pathological DI, and to evaluate the impulsivity frequency in the different forms of MS including at the early stage of the Clinically Isolated Syndrome. Furthermore, this study focused on the factors that may induce abnormal impulsivity, and the link between thalamic atrophy and dysfunctional impulsivity in patients with MS. METHODS: 95 patients with demyelinating diseases including 21 Clinically Isolated Syndrome (CIS), 30 Relapsing-Remitting MS (RRMS), 23 Secondary Progressive MS (SPMS) and 21 Primary Progressive MS (PPMS) were prospectively recruited, and covered by extensive cognitive evaluation including the BCCogSEP (French version of the Brief Repeatable Battery for Neurological disease), the CSCT (Computerized Speed Cognitive Test) for processing speed of information (PSI), the DII to measure FI and DI, the Fast BDI to evaluate depression, and the EMIF-SEP scale to study physical, cognitive and social fatigues. 3D T2-FLAIR and 3D T1-weighted MRI were analyzed using automatic segmentation tools to quantify the T2 lesion load and to measure the whole and regional brain atrophy. RESULTS: 7% showed a pathologically high DI. The level of DI tended to differ significantly depending on the MS phenotype. There was no significant difference between RRMS, SPMS and PPMS, but RRMS showed significantly higher DI than CIS patients. Cognitive fatigue (r:-0.27, p<.01), depression (r:-0.21, p=.04) but mainly PSI (r:.33, p<.001) showed a significant correlation with DI. Among the brain regions of interest, the strongest significant correlation with DI was with thalamic atrophy (r:.33, p<.001). CONCLUSION: Some MS patients show a pathologically high DI, mainly RRMS compared to CIS. Previous study highlighted impulsive traits in MS patients only in relation with the presence of depression. The present study demonstrates that depression tends to correlate with DI, but that cognitive fatigue, and mainly slowing of PSI, which is the most early and severe cognitive impairment in MS, have a stronger impact on the rise of pathological impulsive behaviour. DI in MS is linked to frontal regions but even more strongly to thalamus atrophy. This is in line with the hypothesis of a disconnection syndrome in MS that causes cognitive impairment to trigger and could have the same impact on behaviour. Hence, impulsive behaviour should be evaluated and taken into account in the care of patients with MS.


Assuntos
Transtornos Cognitivos , Esclerose Múltipla Crônica Progressiva , Esclerose Múltipla Recidivante-Remitente , Esclerose Múltipla , Atrofia , Humanos , Comportamento Impulsivo , Imageamento por Ressonância Magnética , Esclerose Múltipla/complicações , Esclerose Múltipla/diagnóstico por imagem , Esclerose Múltipla Crônica Progressiva/complicações , Esclerose Múltipla Crônica Progressiva/diagnóstico por imagem , Esclerose Múltipla Recidivante-Remitente/complicações , Esclerose Múltipla Recidivante-Remitente/diagnóstico por imagem
11.
Mult Scler Relat Disord ; 40: 101969, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32028119

RESUMO

BACKGROUND: Eye movement abnormalities (EMA) are common in multiple sclerosis (MS). However, type and severity according to the MS stage are poorly known, especially in Radiologically Isolated Syndrome (RIS) and in Clinically Isolated Syndrome (CIS). Although MRI has been included in the MS diagnostic criteria, there may be clinical-radiological dissociation. OBJECTIVE: To analyze by video-oculography (VOG) prevalence of EMA in different MS phenotypes and study correlations with brain and cervical cord MRI T2 lesions location. METHODS: 76 participants were prospectively recruited (12 RIS, 10 CIS, 11 relapsing-remitting-MS, 10 secondary progressive-MS, 10 primary progressive MS and 23 gender and age-matched healthy controls). We analyzed fixations, anti-saccades, horizontal and vertical reflex saccades and smooth pursuit. RESULTS: EMA were frequent and of gradual severity from RIS to progressive forms. Internuclear ophthalmoplegia (INO) and centripetal hypermetria were strong arguments for the diagnosis of a demyelinating disorder versus a control population. Some EMA were linked to infratentorial T2 lesion location, but others like INO were not. CONCLUSION: This study confirm that EMA are common in all MS phenotypes, even at the earliest stages. VOG can be useful to detect demyelinating process at preclinical stage by highlighting subclinical EMA even in absence of characteristic lesions visible on MRI.


Assuntos
Encéfalo/diagnóstico por imagem , Medula Cervical/diagnóstico por imagem , Medições dos Movimentos Oculares , Esclerose Múltipla/diagnóstico , Transtornos da Motilidade Ocular/diagnóstico , Adulto , Feminino , Humanos , Imageamento por Ressonância Magnética , Masculino , Pessoa de Meia-Idade , Esclerose Múltipla/diagnóstico por imagem , Esclerose Múltipla/etiologia , Transtornos da Motilidade Ocular/complicações , Gravação em Vídeo
12.
Biochim Biophys Acta ; 1770(1): 48-54, 2007 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-16949758

RESUMO

Lipids in tammar milk are predominantly triacylglycerols, and the fatty acid composition varies during the lactation cycle. Little is known about the regulation of their synthesis. This study investigates the endocrine regulation of lipid synthesis in mammary explants from pregnant tammars. Treatment of mammary explants with insulin resulted in a high level of lipid synthesis, but the lipids accumulated in the cytosol. Culture with prolactin resulted in a small increase in lipid synthesis, but electron microscopy showed lipid globules were synthesized in the mammary epithelial cells and secreted into the lumen. Culture with both insulin and prolactin demonstrated elevated levels of synthesis and secretion of lipid. Analysis of the type of fatty acids synthesized in these mammary explants showed that the initiation of synthesis of C(16:0), which also occurs in the first week of lactation, could be reproduced in the pregnant explants cultured with prolactin alone. However, treatment of mammary explants with hydrocortisone did not show a significant effect on lipid synthesis, secretion or the fatty acid synthesized. These results provide new information identifying the role of insulin and prolactin in regulating milk lipid synthesis and secretion in the tammar.


Assuntos
Glândulas Endócrinas/fisiologia , Lipídeos/biossíntese , Leite , Animais , Hidrocortisona/fisiologia , Insulina/fisiologia , Macropodidae , Glândulas Mamárias Animais/fisiologia , Glândulas Mamárias Animais/ultraestrutura , Microscopia Eletrônica de Transmissão , Prolactina/fisiologia
13.
Rheumatology (Oxford) ; 47(8): 1203-7, 2008 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-18524805

RESUMO

OBJECTIVES: Increased incidence of cardiovascular disease (CVD) has been observed in AS. The reasons of this increase are not fully understood (greater prevalence of traditional cardiovascular risks, consequences of treatment (NSAID) or biological inflammation). The objectives of this study are to assess intima-media thickness (IMT) and arterial stiffness (i.e augmentation index AIx), markers of sub-clinical atherosclerosis in AS patients and to examine the effects of TNF-alpha inhibitors on arterial stiffness in active AS patients. METHODS: Sixty AS patients were enrolled with 60 healthy controls. Their BASDAI (Bath Ankylosing Spondylitis Disease Activity Index) and BASFI (Bath Ankylosing Spondylitis Functional Index) scores, ESR and CRP levels were recorded. Subclinical atherosclerosis was assessed by measurement of AIx by pulse wave analysis and IMT by carotid echography. RESULTS: We found significantly increased IMT in the AS group compared with healthy controls. After adjustment for confounding factors, an underlying trend towards increased IMT was still present (P = 0.06). No difference was found in arterial stiffness between the two groups. AS patients, treated or not with anti-TNF-alpha at baseline, had significantly increased IMT and AIx or a trend towards increase. IMT was positively correlated with tobacco use, WHR and blood pressure but not correlated with CRP level. Despite improvement in markers of disease activity, arterial stiffness was unchanged after 14 weeks of treatment with TNF antagonists. CONCLUSION: This study shows a trend towards increased subclinical atherosclerosis in AS patients. TNF-alpha blockade does not seem to improve arterial stiffness in AS patients, but our results lack statistical power.


Assuntos
Espondilite Anquilosante/fisiopatologia , Túnica Íntima/patologia , Túnica Média/patologia , Resistência Vascular , Adulto , Anti-Inflamatórios não Esteroides/uso terapêutico , Antirreumáticos/uso terapêutico , Artérias/fisiopatologia , Aterosclerose/etiologia , Proteína C-Reativa/metabolismo , Artéria Carótida Primitiva/patologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Índice de Gravidade de Doença , Espondilite Anquilosante/complicações , Espondilite Anquilosante/tratamento farmacológico , Espondilite Anquilosante/patologia , Fator de Necrose Tumoral alfa/antagonistas & inibidores , Resistência Vascular/efeitos dos fármacos
14.
Heredity (Edinb) ; 101(5): 445-52, 2008 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-18685567

RESUMO

The effect of mating system on genetic diversity is a major theme in plant evolutionary genetics, because gene flow plays a large role in structuring the genetic variability within and among populations. Understanding crop mating systems and their consequences for gene flow can aid in managing agricultural systems and conserving genetic resources. We evaluated the extent of pollen flow, its links with farming practices and its impact on the dynamics of diversity of sorghum in fields of Duupa farmers in Cameroon. Duupa farmers grow numerous landraces mixed in a field, a practice that favours extensive pollen flow. We estimated parameters of the mating system of five landraces representative of the genetic diversity cultivated in the study site, using a direct method based on progeny array. The multilocus outcrossing rate calculated from all progenies was 18% and ranged from 0 to 73% among progenies. Outcrossing rates varied greatly among landraces, from 5 to 40%. Our results also showed that individual maternal plants were usually pollinated by more than eight pollen donors, except for one landrace (three pollen donors). Although the biological traits of sorghum (inflorescence morphology, floral traits, phenology) and the spatial planting practices of Duupa farmers led to extensive pollen flow among landraces, selection exerted by farmers appears to be a key parameter affecting the fate of new genetic combinations from outcrossing events. Because both natural and human-mediated factors shape evolution in crop populations, understanding evolutionary processes and designing in situ conservation measures requires that biologists and anthropologists work together.


Assuntos
Cruzamentos Genéticos , Ecossistema , Sorghum/genética , Evolução Biológica , Camarões , Fluxo Gênico , Variação Genética , Humanos , Polinização , Sorghum/fisiologia
15.
Arch Mal Coeur Vaiss ; 99(5): 507-10, 2006 May.
Artigo em Francês | MEDLINE | ID: mdl-16802743

RESUMO

The authors report the case of a 39 years old woman operated for tetralogy of Fallot at the age of 6. Multiple complications due to postoperative atrioventricular block and a poor surgical result on the pulmonary outflow tract led to several reoperations. Right ventricular dysfunction with pulmonary regurgitation and mitral tricuspid valve disease in a context of endocarditis on the pacing catheter led to double pulmonary and tricuspid valve replacement with mechanical prostheses. The outcome at follow-up at 3 years is good. To the authors' knowledge, this is the first reported case of double mechanical valve replacement of the right heart after complete repair of tetralogy of Fallot.


Assuntos
Complicações Pós-Operatórias/cirurgia , Implantação de Prótese , Insuficiência da Valva Pulmonar/cirurgia , Tetralogia de Fallot/cirurgia , Insuficiência da Valva Tricúspide/cirurgia , Adulto , Feminino , Humanos , Insuficiência da Valva Pulmonar/etiologia , Reoperação , Tetralogia de Fallot/complicações , Resultado do Tratamento , Insuficiência da Valva Tricúspide/etiologia
16.
Genetics ; 148(2): 905-19, 1998 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-9504936

RESUMO

This paper presents the first theoretical study of spatial genetic structure within nonuniformly distributed continuous plant populations. A novel individual-based model of isolation by distance was constructed to simulate genetic evolution within such populations. We found larger values of spatial genetic autocorrelations in highly clumped populations than in uniformly distributed populations. Most of this difference was caused by differences in mean dispersal distances, but aggregation probably also produced a slight increase in spatial genetic structure. Using an appropriate level of approximation of the continuous distribution of individuals in space, we assessed the potential effects of density, seed and pollen dispersal, generation overlapping, and overdominance selection at an independent locus, on fine-scale genetic structure, by varying them separately in a few particular cases with extreme clumping. When selfing was allowed, all these input variables influenced both aggregation and spatial genetic structure. Most variations in spatial genetic structure were closely linked to variations in clumping and/or local density. When selfing was not allowed, spatial genetic structure was lower in most cases.


Assuntos
Plantas/genética , Evolução Biológica , Simulação por Computador , Genética Populacional , Genótipo , Modelos Genéticos , Pólen/genética , Sementes/genética , Estatística como Assunto
17.
Arch Mal Coeur Vaiss ; 98(5): 586-9, 2005 May.
Artigo em Francês | MEDLINE | ID: mdl-15966615

RESUMO

The authors report the case of a 64 year old woman with typical valvular pulmonary stenosis in whom spontaneous and sudden reopening of the foramen ovale resulted in cyanosis. Transthoracic echocardiography with injection of contrast provides a complete diagnosis: valvular pulmonary stenosis with a mean pressure gradient of 83 mmHg and massive right-to-left interatrial shunt. The malformation was treated by interventional catheterisation in a two-stage procedure: pulmonary valvuloplasty followed by closure of the foramen ovale because of the persistence of a right-to-left interatrial shunt. The functional improvement was followed by the appearance of effort angina. Coronary angiography showed single vessel disease of the left anterior descending artery treated by stenting. The long-term outcome was satisfactory.


Assuntos
Cateterismo Cardíaco , Estenose da Valva Pulmonar/complicações , Trilogia de Fallot/etiologia , Trilogia de Fallot/patologia , Ecocardiografia , Feminino , Humanos , Pessoa de Meia-Idade , Stents , Resultado do Tratamento
18.
Neurophysiol Clin ; 23(5): 434-46, 1993 Oct.
Artigo em Francês | MEDLINE | ID: mdl-8413120

RESUMO

Normative data of ulnar motor and orthodromic sensitive conduction velocities are performed at different levels on 68 (19 to 49 year old) adult population which included 35 men and 33 women. In fact, 102 ulnar nerves are tested, 51 nerves for female population and male population respectively. For motor conduction velocities, the ulnar nerve is stimulated at five levels: at the wrist level, below elbow, at the elbow, above elbow, and at the axillary point; the motor responses were picked up on the hypothenar muscles (surface electrodes). For orthodromic sensitive conduction velocities, the fifth finger is stimulated and the electrical activities are picked up by surface electrodes which are placed at the same points. The difference between the conduction velocities values measured on the below elbow/wrist segment and the above elbow/wrist segment proved to be satisfactory for the possible detection of a compression of the ulnar nerve at the elbow.


Assuntos
Condução Nervosa/fisiologia , Nervo Ulnar/fisiologia , Adulto , Estimulação Elétrica , Potenciais Evocados/fisiologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Músculos/inervação , Tempo de Reação/fisiologia , Valores de Referência , Sensação/fisiologia
19.
Neurophysiol Clin ; 22(3): 207-24, 1992 Jul.
Artigo em Francês | MEDLINE | ID: mdl-1528176

RESUMO

The percutaneous electrical stimulation of the brain and spinal cord has been used to study the central motor pathways in 19 healthy full-term newborns and in 19 infants. The evoked compound muscle action potential were recorded by bipolar surface electrodes fixed on the skin overlying the thenar eminence muscles and the tibialis anterior muscle. In full-term newborns, the responses of lower limb muscles to cortical stimulation are more difficult to obtain that those of upper limb muscles. At birth, the conduction velocity of central motor fibres along the spinal cord are around 10 m/s, 4 or 5 times lower that the lowest values published for adult subjects. Thus, as has been demonstrated in animals, there seems to exist in man a very clear dissociation between myelination of central motor pathways and that of peripheral motor fibres.


Assuntos
Encéfalo/fisiologia , Medula Espinal/fisiologia , Potenciais de Ação/fisiologia , Encéfalo/crescimento & desenvolvimento , Criança , Eletroencefalografia , Feminino , Humanos , Lactente , Recém-Nascido , Masculino , Músculos/fisiologia , Condução Nervosa/fisiologia , Vias Neurais/crescimento & desenvolvimento , Vias Neurais/fisiologia , Tempo de Reação/fisiologia , Medula Espinal/crescimento & desenvolvimento , Estimulação Elétrica Nervosa Transcutânea
20.
Tumori ; 86(5): 428-30, 2000.
Artigo em Inglês | MEDLINE | ID: mdl-11130576

RESUMO

A 36-year-old man with testicular cancer had an acute myocardial infarction during the first course of chemotherapy with bleomycin, etoposide and cisplatin. Since the patient had no significant risk factors for coronary heart disease, the infarction was likely to be attributable to the chemotherapy regimen. The physiopathological mechanisms of this causal relationship are discussed here.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/efeitos adversos , Sistema de Condução Cardíaco/efeitos dos fármacos , Infarto do Miocárdio/induzido quimicamente , Neoplasias Testiculares/tratamento farmacológico , Adulto , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Bleomicina/efeitos adversos , Carcinoma Embrionário/tratamento farmacológico , Cisplatino/efeitos adversos , Eletrocardiografia/efeitos dos fármacos , Etoposídeo/efeitos adversos , Humanos , Masculino , Infarto do Miocárdio/diagnóstico , Infarto do Miocárdio/enzimologia , Infarto do Miocárdio/fisiopatologia , Teratoma/tratamento farmacológico
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