Encontrados 6 documentos, a visualizar página 1 de 1
Effects of Acute Autonomic Modulation on Atrial Conduction Delay and Local Elec...
Oliveira, MM; Nogueira da Silva, M; Cunha, P; Ramos, R; Marques, F; Santos, S; Rocha, I; Silva-Carvalho, L; Cruz Ferreira, RSlowed atrial conduction may contribute to reentry circuits and vulnerability for atrial fibrillation (AF). The autonomic nervous system (ANS) has modulating effects on electrophysiological properties. However, complex interactions of the ANS with the arrhythmogenic substrate make it difficult to understand the mechanisms underlying induction and maintenance of AF. AIM: To determine the effect of acute ANS mod...
Impacto da Estimulação Vagal na Indução e Interrupção de Fibrilhação Auricular ...
Oliveira, MM; Nogueira da Silva, M; Geraldes, V; Postolache, G; Xavier, R; Laranjo, S; Rocha, I; Cruz Ferreira, R; Silva-Carvalho, LINTRODUCTION: Vagal activity is thought to influence atrial electrophysiological properties and play a role in the initiation and maintenance of atrial fibrillation (AF). In this study, we assessed the effects of acute vagal stimulation (vagus_stim) on atrial conduction times, atrial and pulmonary vein (PV) refractoriness, and vulnerability to induction of AF in the rabbit heart with intact autonomic innervatio...
Inducibility of Atrial Fibrillation During Electrophysiologic Evaluation is Ass...
Oliveira, MM; Nogueira da Silva, M; Timóteo, AT; Feliciano, J; Sousa, L; Santos, S; Silva-Carvalho, L; Cruz Ferreira, RThe impact of atrial dispersion of refractoriness (Disp_A) in the inducibility and maintenance of atrial fibrillation (AF) has not been fully resolved. AIM: To study the Disp_A and the vulnerability (A_Vuln) for the induction of self-limited (<60 s) and sustained episodes of AF. METHODS AND RESULTS: Forty-seven patients with paroxysmal AF (PAF): 29 patients without structural heart disease and 18 with hypertens...
Influência da Estimulação e Bloqueio do Sistema Nervoso Autónomo na Refractarie...
Oliveira, MM; Nogueira da Silva, M; Feliciano, J; Timóteo, AT; Marques, F; Santos, S; Rocha, I; Silva-Carvalho, L; Cruz Ferreira, RWith the recent technical improvement in echocardiography imaging (second harmonics) the number of interatrial septum aneurysms (ASA) increased and are easily recognized. We assist to an overdiagnosing number of cases and diagnostic criteria emerged to face this problem. In the great majority of the cases ASA are small and inoffensive, but as ASA is considered a risk factor for cardioembolism when associated wi...
Alterações da Actividade Autonómica Durante o Teste de Inclinação em Doentes co...
Oliveira, MM; Nogueira da Silva, M; Timóteo, AT; Feliciano, J; Silva, S; Xavier, R; Rocha, I; Silva-Carvalho, L; Cruz Ferreira, RThe autonomic nervous system (ANS) is known to be an important modulator in the pathogenesis of paroxysmal atrial fibrillation (PAF). Changes in ANS control of heart rate variability (HRV) occur during orthostatism to maintain cardiovascular homeostasis. Wavelet transform has emerged as a useful tool that provides time-frequency decomposition of the signal under investigation, enabling intermittent components o...
Incidência de "Falsos-Positivos" em Idosos com Fibrilhação Auricular Paroxístic...
Oliveira, MM; Feliciano, J; Timóteo, AT; Nogueira da Silva, M; Antunes, E; Silva, S; Alves, S; Silva-Carvalho, L; Cruz Ferreira, RThe autonomic nervous system (ANS) plays a role as a modulator in the pathogenesis of paroxysmal atrial fibrillation (PAF). The clinical pattern of vagally mediated PAF has been observed mainly in young patients. Neurocardiogenic responses during orthostatic stress are related to autonomic reflexes in which the vagal influence predominates. AIM: To evaluate the susceptibility of elderly patients with PAF to ac...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||