doi: 10.1161/hq1201.099509
© 2001 American Heart Association, Inc.
Atherosclerosis and Lipoproteins |
Pretreatment With Simvastatin Attenuates Myocardial Dysfunction After Ischemia and Chronic Reperfusion
From the Department of Molecular and Cellular Physiology, LSU Health Sciences Center, Shreveport, La.
Reprint requests to David J. Lefer, PhD, Department of Molecular and Cellular Physiology, LSU Health Sciences Center, 1501 Kings Hwy, Shreveport, LA 71130. E-mail dlefer{at}lsuhsc.edu
We have previously demonstrated that simvastatin attenuates myocardial cell necrosis after acute myocardial ischemia and reperfusion via induction of endothelial cell NO synthase. However, it remains unknown whether the cardioprotective effects of statins can persist after extended periods of reperfusion. Furthermore, it is unknown whether simvastatin therapy can attenuate postischemic cardiac dysfunction. Pretreatment with simvastatin attenuated myocardial injury after 30 minutes of myocardial ischemia and 24 hours of reperfusion. However, the protective effects are not recognized unless simvastatin is given at least 3 hours before myocardial ischemia. Subsequently, we pretreated mice with vehicle or simvastatin and subjected the mice to 30 minutes of myocardial ischemia and 6 months of reperfusion. Myocardial infarct size (percentage of left ventricle) was significantly reduced by 51% in the simvastatin-treated group compared with the vehicle-treated group. Left ventricular diastolic and systolic dilatation was significantly (P<0.05) reduced in simvastatin-treated mice compared with vehicle-treated mice. Additionally, the decrement in fractional shortening after 6 months of reperfusion was minimized in simvastatin-treated mice (P=NS versus baseline) compared with vehicle-treated mice (P<0.05 versus baseline). Left ventricular end-diastolic pressure was significantly (P<0.01) elevated in vehicle-treated mice (21±4 mm Hg) but not simvastatin-treated mice (5±2 mm Hg) compared with baseline values. These data demonstrate that simvastatin treatment before myocardial ischemia attenuates infarct size and preserves myocardial function after chronic reperfusion in mice.
Key Words: inflammation • nitric oxide • infarct • contractile function
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