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Abstract Objective To investigate cardiac changes during the development of 3 rat heart failure models. Methods 90 SD rats were divided into four groups. Heart failure models were established by tail vein injection of Adriamycin (group A, n=20), abdominal aorta deligation (group B, n=20) or gastric gavage of thyroxine (group C, n=20). Echocardiography, brain natriuretic peptide (BNP) and myocardial histology were measured and compared with control group (n=30). Results In group A, left ventricle enlarged, left ventricular ejection fraction(LVEF) decreased and plasma BNP began to rise at 4 weeks, the ventricular wal thinned during 8~12 weeks. Both in group B and C, the ventricular wal thickened at 4 week, left ventricle enlarged and LVEF decreased with BNP being increased during 8~12 weeks. LVEF increased in group B and was not changed in group C at 4 weeks. After 20 weeks, global cardiac enlargement developed, LVFS and LVEF decreased and BNP increased significantly in al three groups with no significant difference among them. Conclusion Echocardiography, BNP and histological examination may be used to evaluate the changes of cardiac morphology, function and myocardial tissues at different periods during the development of 3 different rat heart failure models.
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