Utilização do Inventário de Habilidades sociais no diagnóstico do Transtorno de Ansiedade Social

Este estudo objetivou verificar as associações entre as manifestações clínicas e comportamentais do Transtorno de Ansiedade Social (TAS) e aferir a validade discriminativa do Inventário de Habilidades Sociais (IHS-Del-Prette) no diagnóstico deste transtorno. Participaram 1006 estudantes universitários, na faixa etária entre 17 e 35 anos, de ambos os gêneros. Posteriormente, 86 participantes foram randomicamente selecionados desta amostra inicial e agrupados como casos e não-casos de TAS por meio de avaliação clínica sistemática. Os resultados obtidos indicaram que quanto mais elaborado for o repertório de habilidades sociais de um indivíduo, menor será a sua probabilidade de satisfazer os critérios de rastreamento de indicadores diagnósticos para o TAS. Além disso, o IHS-Del-Prette demonstrou distinguir significativamente indivíduos com e sem TAS, evidenciando-se a sua validade discriminativa.

Imagem corporal e hábitos alimentares na anorexia nervosa: uma revisão integrativa da literatura

Revisão integrativa da literatura com objetivo de investigar os construtos da imagem corporal e hábitos alimentares na anorexia nervosa (AN). As bases consultadas foram MedLine, LILACS e PsycINFO, no período de 2005 a 2009. A maioria dos artigos encontrados é constituída de estudos não-experimentais e descritivos, provenientes de fontes internacionais. Os resultados evidenciaram que a personalidade de mulheres com AN é permeada por baixa autoestima, sentimentos de inferioridade, inadequação, insegurança, perfeccionismo e obsessividade, fatores que acarretam acentuada inibição e retraimento social, e que exercem influência na distorção da imagem corporal e na aquisição de hábitos alimentares disfuncionais. Como conclusão ressalta-se a necessidade de tratamento interdisciplinar, e de novos estudos experimentais e nacionais, que busquem compreender a relação entre os construtos.

Effect of simvastatin in the autonomic system is dependent on the increased gain/sensitivity of the baroreceptors

A number of mechanisms have been proposed to explain the pleiotropic effect of statin therapy to reduce sympathetic outflow in cardiovascular disease. We tested the hypothesis that statin treatment could improve baroreflex gain-sensitivity triggered by morphological adaptations in the mechanoreceptor site, thus reducing sympathetic activity, regardless of arterial pressure (AP) level reduction. Male spontaneously hypertensive rats (SHR) were divided into control (SHR, n = 8) and SHR-simvastatin (5 mg/kg/day, for 7 days) (SHR-S, n = 8). After treatment, AP, baroreflex sensitivity (BRS) in response to AP-induced changes, aortic depressor nerve activity, and spectral analyses of pulse interval (PI) and AP variabilities were performed. Internal and external carotids were prepared for morphoquantitative evaluation. Although AP was similar between groups, sympathetic modulation, represented by the low frequency band of PI (SHR: 6.84 ± 3.19 vs. SHR-S: 2.41 ± 0.96 msec2) and from systolic AP variability (SHR: 3.95 ± 0.36 vs. SHR-S: 2.86 ± 0.18 mmHg2), were reduced in treated animals. In parallel, simvastatin induced an increase of 26% and 21% in the number of elastic lamellae as well as a decrease of 9% and 25% in the carotid thickness in both, external and internal carotid, respectively. Moreover, improved baroreceptor function (SHR: 0.78 ± 0.03 vs. SHR-S: 1.06 ± 0.04% mv/mmHg) was observed in addition to a 115% increase in aortic depressor nerve activity in SHR-S rats. Therefore, our data suggest that the reduction of sympathetic outflow in hypertension by simvastatin treatment may be triggered by structural changes in the carotid arteries and increased BRS in response to an improvement of the baroreceptors discharge and consequently of the afferent pathway of the baroreflex arch.

P2Y1 receptors expressed by C1 neurons determine peripheral chemoreceptor modulation of breathing, sympathetic activity, and blood pressure

Catecholaminergic C1 cells of the rostral ventrolateral medulla (RVLM) are key determinants of the sympathoexcitatory response to peripheral chemoreceptor activation. Overactivation of this reflex is thought to contribute to increased sympathetic activity and hypertension; however, molecular mechanisms linking peripheral chemoreceptor drive to hypertension remain poorly understood. We have recently determined that activation of P2Y1 receptors in the RVLM mimicked effects of peripheral chemoreceptor activation. Therefore, we hypothesize that P2Y1 receptors regulate peripheral chemoreceptor drive in this region. Here, we determine whether P2Y1 receptors are expressed by C1 neurons in the RVLM and contribute to peripheral chemoreceptor control of breathing, sympathetic activity, and blood pressure. We found that injection of a specific P2Y1 receptor agonist (MRS2365) into the RVLM of anesthetized adult rats increased phrenic nerve activity (≈55%), sympathetic nerve activity (38±6%), and blood pressure (23±1 mm Hg), whereas application of a specific P2Y1 receptor antagonist (MRS2179) decreased peripheral chemoreceptor–mediated activation of phrenic nerve activity, sympathetic nerve activity, and blood pressure. To establish that P2Y1 receptors are expressed by C1 cells, we determine in the brain slice preparation using cell-attached recording techniques that cells responsive to MRS2365 are immunoreactive for tyrosine hydroxylase (a marker of C1 cells), and we determine in vivo that C1-lesioned animals do not respond to RVLM injection of MRS2365. These data identify P2Y1 receptors as key determinants of peripheral chemoreceptor regulation of breathing, sympathetic nerve activity, and blood pressure.