Association between Functional Variables and Heart Failure after Myocardial Infarction in Rats.
Arq Bras Cardiol
; 106(2): 105-12, 2016 Feb.
Article
em En, Pt
| MEDLINE
| ID: mdl-26815462
ABSTRACT
BACKGROUND:
Heart failure prediction after acute myocardial infarction may have important clinical implications.OBJECTIVE:
To analyze the functional echocardiographic variables associated with heart failure in an infarction model in rats.METHODS:
The animals were divided into two groups control and infarction. Subsequently, the infarcted animals were divided into groups with and without heart failure. The predictive values were assessed by logistic regression. The cutoff values predictive of heart failure were determined using ROC curves.RESULTS:
Six months after surgery, 88 infarcted animals and 43 control animals were included in the study. Myocardial infarction increased left cavity diameters and the mass and wall thickness of the left ventricle. Additionally, myocardial infarction resulted in systolic and diastolic dysfunction, characterized by lower area variation fraction values, posterior wall shortening velocity, E-wave deceleration time, associated with higher values of E / A ratio and isovolumic relaxation time adjusted by heart rate. Among the infarcted animals, 54 (61%) developed heart failure. Rats with heart failure have higher left cavity mass index and diameter, associated with worsening of functional variables. The area variation fraction, the E/A ratio, E-wave deceleration time and isovolumic relaxation time adjusted by heart rate were functional variables predictors of heart failure. The cutoff values of functional variables associated with heart failure were area variation fraction < 31.18%; E / A > 3.077; E-wave deceleration time < 42.11 and isovolumic relaxation time adjusted by heart rate < 69.08.CONCLUSION:
In rats followed for 6 months after myocardial infarction, the area variation fraction, E/A ratio, E-wave deceleration time and isovolumic relaxation time adjusted by heart rate are predictors of heart failure onset.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Insuficiência Cardíaca
/
Infarto do Miocárdio
Tipo de estudo:
Diagnostic_studies
/
Etiology_studies
/
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Limite:
Animals
Idioma:
En
/
Pt
Revista:
Arq Bras Cardiol
Ano de publicação:
2016
Tipo de documento:
Article