Data/hora: 12/06/2024 15:14:33

Provedor de dados: | 56
País: | Brazil
Título: | Heart rate changes during the Valsalva maneuver in patients with isolated aortic insufficiency
Autores: | Navarro,A.E.; Dávila,D.F.; Torres,A.; Bellabarba,G.; Donis,J.H.; Casado,J.
Data: | 1997-09-01
Ano: | 1997
Palavras-chave: | Valsalva maneuver; Parasympathetic nervous system; Left ventricular systolic function; Chronic aortic insufficiency; Ejection fraction.
Resumo: | To determine the possible relationship between left ventricular dilatation and heart rate changes provoked by the Valsalva maneuver (Valsalva ratio), we studied 9 patients with isolated chronic aortic insufficiency. Left ventricular systolic function was assessed by two-dimensional echocardiography and cardiac catheterization. All patients were asymptomatic (functional class I of the New York Heart Association). The left ventricular internal diameters and volumes were significantly increased in all patients. The asymptomatic patients had either normal or slightly depressed ejection fraction (EF&amp;gt;0.40). The Valsalva ratio of these asymptomatic patients showed no significant correlation with the left ventricular volumes or with the left ventricular ejection fraction. In other words, parasympathetic heart rate control, as expressed by the Valsalva ratio, was normal in the asymptomatic patients with left ventricular dilatation and preserved left ventricular ejection fraction. Therefore, left ventricular dilatation may not be the major mechanism responsible for the abnormal parasympathetic heart rate control of patients with acquired heart disease
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000900005
Editor: | Associação Brasileira de Divulgação Científica
Relação: | 10.1590/S0100-879X1997000900005
Formato: | text/html
Fonte: | Brazilian Journal of Medical and Biological Research  v.30 n.9 1997
Fonte: | info:eu-repo/semantics/openAccess