Data/hora: 03/06/2024 02:26:32

Provedor de dados: 	56	
País: 	Brazil	
Título: 	Rats with high left ventricular end-diastolic pressure can be identified by Doppler echocardiography one week after myocardial infarction	
Autores: 	Saraiva,R.M.; Kanashiro-Takeuchi,R.M.; Antonio,E.L.; Campos,O.; Tucci,P.J.F.; Moisés,V.A.	
Data: 	2007-11-01	
Ano: 	2007	
Palavras-chave: 	Heart failure; Myocardial infarction; Echocardiography; Hemodynamics.	
Resumo: 	The severity of left ventricular (LV) dysfunction in rats with myocardial infarction (MI) varies widely. Because homogeneity in baseline parameters is essential for experimental investigations, a study was conducted to establish whether Doppler echocardiography (DE) could accurately identify animals with high LV end-diastolic pressure as a marker of LV dysfunction soon after MI. Direct measurements of LV end-diastolic pressure were made and DE was performed simultaneously 1 week after surgically induced MI (N = 16) or sham-operation (N = 17) in female Wistar rats (200 to 250 g). The ratio of peak early (E) to late (A) diastolic LV filling velocities and the ratio of E velocity to peak early (Em) diastolic myocardial velocity were the best predictors of high LV end-diastolic pressure (&gt;12 mmHg) soon after MI. Cut-off values of 1.77 for the E/A ratio (P = 0.001) identified rats with elevated LV end-diastolic pressure with 90% sensitivity and 80% specificity. Cut-off values of 20.4 for the E/Em ratio (P = 0.0001) identified rats with elevated LV end-diastolic pressure with 81.8% sensitivity and 80% specificity. Moreover, E/A and E/Em ratios were the only echocardiographic parameters independently associated with LV end-diastolic pressure in multiple linear regression analysis. Therefore, DE identifies rats with high LV end-diastolic pressure soon after MI. These findings have implications for using serial DE in animal selection and in the assessment of their response to experimental therapies.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007001100016	
Editor: 	Associação Brasileira de Divulgação Científica	
Relação: 	10.1590/S0100-879X2006005000178	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Medical and Biological Research  v.40 n.11 2007	
Fonte: 	info:eu-repo/semantics/openAccess