Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 6 de 6
Mais filtros

Base de dados
Intervalo de ano de publicação
J Am Acad Child Adolesc Psychiatry ; 55(11): 980-989, 2016 11.
Artigo em Inglês | MEDLINE | ID: mdl-27806866


OBJECTIVE: To examine prefrontal and amygdala activation during emotional processing in youth with or at varying risk for developing mania to identify candidate central prodromal risk biomarkers. METHOD: Four groups of medication-free adolescents (10-20 years old) participated: adolescents with first-episode bipolar I disorder (BP-I; n = 32), adolescents with a parent with bipolar disorder and a depressive disorder (at-risk depressed [ARD]; n = 32), healthy adolescents with a parent with bipolar disorder (at-risk healthy [ARH]; n = 32), and healthy adolescents with no personal or family history of psychiatric illness (healthy comparison [HC]; n = 32). Participants underwent functional magnetic resonance imaging while performing a continuous performance task with emotional and neutral distracters. Region-of-interest analyses were performed for the bilateral amygdala and for subregions of the ventrolateral prefrontal cortex and anterior cingulate cortex. RESULTS: Overall, no group differences in bilateral amygdala and ventrolateral prefrontal cortex (Brodmann area [BA] 45/47) activation during emotional or neutral stimuli were observed. The BP-I group exhibited lower right pregenual anterior cingulate cortex activation compared with the HC group, and activation in the left BA 44 was greater in the ARH and ARD groups compared with the HC group. BP-I and ARD groups exhibited blunted activation in the right BA 10 compared with the ARH group. CONCLUSION: During emotional processing, amygdala and ventrolateral prefrontal cortex (BA 45/47) activation does not differ in youth with or at increasing risk for BP-I. However, blunted pregenual anterior cingulate cortex activation in first-episode mania could represent an illness biomarker, and greater prefrontal BA 10 and BA 44 activations in at-risk youth could represent a biomarker of risk or resilience warranting additional investigation in prospective longitudinal studies.

Tonsila do Cerebelo/fisiopatologia , Transtorno Bipolar/fisiopatologia , Filho de Pais Incapacitados , Córtex Pré-Frontal/fisiopatologia , Adolescente , Adulto , Tonsila do Cerebelo/diagnóstico por imagem , Transtorno Bipolar/diagnóstico por imagem , Criança , Feminino , Humanos , Imagem por Ressonância Magnética , Masculino , Córtex Pré-Frontal/diagnóstico por imagem , Risco , Adulto Jovem
Psychiatry Res ; 223(3): 268-70, 2014 Sep 30.
Artigo em Inglês | MEDLINE | ID: mdl-25035298


This preliminary study investigated the neurofunctional effects of carbamazepine-extended release (XR) treatment in 11 manic youth with bipolar disorder during performance of a sustained attention task, the Continuous Performance Task - Identical Pairs version (CPT-IP), during functional magnetic resonance imaging (fMRI). All patients underwent baseline fMRI, and 10 patients were scanned again at endpoint. Nine demographically matched healthy youth, who were scanned once, served as controls. Carbamazepine-XR treatment was associated with normalization of activation in right Brodmann area 10 (BA). These results suggest that carbamazepine-XR treatment may correct prefrontal dysfunction in adolescent mania.

Antimaníacos/farmacologia , Atenção , Carbamazepina/farmacologia , Córtex Pré-Frontal/efeitos dos fármacos , Córtex Pré-Frontal/fisiopatologia , Análise e Desempenho de Tarefas , Adolescente , Atenção/efeitos dos fármacos , Transtorno Bipolar , Córtex Cerebral/efeitos dos fármacos , Córtex Cerebral/fisiopatologia , Feminino , Humanos , Imagem por Ressonância Magnética , Masculino
Med Sci Educ ; 23(4): 572-577, 2013 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-24634798


Researchers designed learner-directed journal clubs to develop literature evaluation skills in preclinical students. Sessions balanced student-led discussion with structured objectives and faculty support. During the pilot with preclinical MD/PhD students, self-rated mastery improved over all 17 measured objectives. Six exercises have since been incorporated into the full medical school curriculum.

Isr J Psychiatry Relat Sci ; 49(2): 112-20, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22801290


BACKGROUND: Prior research has found that manic adolescents with bipolar disorder exhibit neurofunctional changes in the amygdala and prefrontal cortex following treatment with some pharmacological agents. We examined the neurofunctional effects of ziprasidone in manic adolescents. METHOD: Manic adolescents with bipolar disorder (n=23) participated in a placebo-controlled study of ziprasidone and underwent a functional magnetic resonance imaging scanning session while performing a task of sustained attention at baseline, prior to treatment as well as on days 7 and 28 (or early termination) of treatment. A comparison group of healthy adolescents (n=10) participated in a single scanning session. Region of interest analyses were performed to assess activation changes associated with treatment in Brodmann Areas (BA) 10, 11 and 47 and in the amygdala. RESULTS: Compared with placebo, treatment with ziprasidone was associated with greater increases over time in right BA 11 and 47 activation. These effects were not associated with differences in symptom improvement between the treatment groups. Patients who subsequently responded to ziprasidone showed significantly greater deactivation in the right Brodmann area 47 at baseline than those who did not respond to ziprasidone. Similarly, among the bipolar adolescents who were treated with ziprasidone, baseline activation in right BA 47 was negatively correlated with improvement in Young Mania Rating Scale (YMRS) score. LIMITATIONS: The small sample size limits the ability to detect significant group differences in other regions of interest. Healthy comparison subjects were scanned only at a single timepoint, which limits the interpretation of the results. Ziprasidone is not currently approved by the United States Food and Drug Administration for the treatment of adolescents with mania, and, therefore, the clinical relevance of these results is limited. CONCLUSIONS: The increases in right BA 11 and 47 activation observed during sustained attention tasks following ziprasidone treatment and the association identified between lower baseline BA 47 activation and ziprasidone treatment response suggests that ziprasidone may correct prefrontal dysfunction in manic adolescents with bipolar disorder.

Tonsila do Cerebelo/efeitos dos fármacos , Antipsicóticos/farmacologia , Transtorno Bipolar/tratamento farmacológico , Piperazinas/farmacologia , Córtex Pré-Frontal/efeitos dos fármacos , Tiazóis/farmacologia , Adolescente , Antipsicóticos/administração & dosagem , Criança , Feminino , Humanos , Imagem por Ressonância Magnética , Masculino , Piperazinas/administração & dosagem , Tiazóis/administração & dosagem
Psychiatry Res ; 202(3): 239-44, 2012 Jun 30.
Artigo em Inglês | MEDLINE | ID: mdl-22819939


Youths with conduct disorder or oppositional defiant disorder and psychopathic traits (CD/ODD+PT) are at high risk of adult antisocial behavior and psychopathy. Neuroimaging studies demonstrate functional abnormalities in orbitofrontal cortex and the amygdala in both youths and adults with psychopathic traits. Diffusion tensor imaging in psychopathic adults demonstrates disrupted structural connectivity between these regions (uncinate fasiculus). The current study examined whether functional neural abnormalities present in youths with CD/ODD+PT are associated with similar white matter abnormalities. Youths with CD/ODD+PT and comparison participants completed 3.0 T diffusion tensor scans and functional magnetic resonance imaging scans. Diffusion tensor imaging did not reveal disruption in structural connections within the uncinate fasiculus or other white matter tracts in youths with CD/ODD+PT, despite the demonstration of disrupted amygdala-prefrontal functional connectivity in these youths. These results suggest that disrupted amygdala-frontal white matter connectivity as measured by fractional anisotropy is less sensitive than imaging measurements of functional perturbations in youths with psychopathic traits. If white matter tracts are intact in youths with this disorder, childhood may provide a critical window for intervention and treatment, before significant structural brain abnormalities solidify.

Transtornos de Deficit da Atenção e do Comportamento Disruptivo/patologia , Mapeamento Encefálico , Transtorno da Conduta/patologia , Sistema Límbico/patologia , Fibras Nervosas Mielinizadas/patologia , Adolescente , Análise de Variância , Anisotropia , Transtorno da Personalidade Antissocial/complicações , Transtorno da Personalidade Antissocial/patologia , Transtornos de Deficit da Atenção e do Comportamento Disruptivo/complicações , Estudos de Casos e Controles , Criança , Transtorno da Conduta/complicações , Imagem de Tensor de Difusão , Feminino , Humanos , Processamento de Imagem Assistida por Computador , Masculino , Escalas de Graduação Psiquiátrica
Bipolar Disord ; 14(4): 356-74, 2012 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-22631620


OBJECTIVE: Recent theories regarding the neuropathology of bipolar disorder suggest that both neurodevelopmental and neurodegenerative processes may play a role. While magnetic resonance imaging has provided significant insight into the structural, functional, and connectivity abnormalities associated with bipolar disorder, research assessing longitudinal changes has been more limited. However, such research is essential to elucidate the pathophysiology of the disorder. The aim of our review is to examine the extant literature for developmental and progressive structural and functional changes in individuals with and at risk for bipolar disorder. METHODS: We conducted a literature review using MEDLINE and the following search terms: bipolar disorder, risk, child, adolescent, bipolar offspring, MRI, fMRI, DTI, PET, SPECT, cross-sectional, longitudinal, progressive, and developmental. Further relevant articles were identified by cross-referencing with identified manuscripts. CONCLUSIONS: There is some evidence for developmental and progressive neurophysiological alterations in bipolar disorder, but the interpretation of correlations between neuroimaging findings and measures of illness exposure or age in cross-sectional studies must be performed with care. Prospective longitudinal studies placed in the context of normative developmental and atrophic changes in neural structures and pathways thought to be involved in bipolar disorder are needed to improve our understanding of the neurodevelopmental underpinnings and progressive changes associated with bipolar disorder.

Transtorno Bipolar/fisiopatologia , Encéfalo/fisiopatologia , Transtorno Bipolar/patologia , Encéfalo/crescimento & desenvolvimento , Encéfalo/patologia , Progressão da Doença , Neuroimagem Funcional , Humanos