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Captopril cardioplegia on myocardial protection in the hypertrophied rat hearts.

Abstract：

:Hearts with pressure-overload hypertrophy show an increased intracardiac activation of the renin-angiotensin system (RAS) which may contribute to myocardial ischemia and reperfusion injury. This study investigates whether the hypertrophied myocardium is more vulnerable to ischemia and reperfusion injury and whether the specific inhibition of the cardiac RAS by captopril would modify ischemia and reperfusion injury in the hypertrophied myocardium. By using the isolated working rat heart model, hypertrophied hearts, induced by abdominal aortic banding for 6 weeks, were subjected to 120 min of hypothermic ischemic arrest followed by 30 min of reperfusion. The postischemic cardiac function recovery was measured in both the untreated (n = 10) and the captopril-treated (n = 11) groups and was compared with that of the sham-operated non-hypertrophied control hearts (n = 10). Captopril (23.0 microM) was given to one group with the hypertrophied hearts from the beginning of ischemia to the end of reperfusion. In comparison with the normal control hearts, the cardiac function recovery after 30 min reperfusion was poorer in the hypertrophied hearts, which was associated with a lower recovery of coronary flow (CF), a higher myocardial lactate content and a retarded peak myocardial creatinkinase (CK) release. Captopril significantly improved the cardiac function recovery, which was associated with an increased CF recovery and a lower myocardial lactate content, and a rapid peak CK release. In conclusion, this study shows that the hypertrophied myocardium leads to an increased susceptibility to ischemia and reperfusion injury. Captopril, most likely by its inhibition of the cardiac RAS, is effective in preventing the ischemia and reperfusion injury in the hypertrophied heart.

journal_name

Int J Cardiol

journal_title

International journal of cardiology

authors

Zhang YH,Xu SC

doi

10.1016/0167-5273(94)90179-1

subject

Has Abstract

pub_date

1994-12-01 00:00:00

pages

131-7

issue

2

eissn

0167-5273

issn

1874-1754

pii

0167-5273(94)90179-1

journal_volume

47

pub_type

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