Cardioprotection exerted by intravenous statin at index myocardial infarction event attenuates cardiac damage upon recurrent infarction.

Aims: Recurrent acute myocardial infarction (RE-AMI) is a frequent complication after STEMI, and its association with stent thrombosis can be life-threatening. Intravenous atorvastatin (IV-atorva) administration during AMI has been shown to limit infarct size and adverse cardiac remodeling. We determined by cardiac magnetic resonance (CMR) whether the cardioprotection exerted by IV-atorva at the index AMI event translates into a better prognosis upon RE-AMI in dyslipidemic pigs.

Methods And Results: Hypercholesterolemic pigs underwent a first AMI (90-minute coronary balloon occlusion). During ongoing ischemia, animals received IV-atorva or vehicle. Forty days later, animals underwent RE-AMI and were sacrificed on day43. All animals remained on p.o. atorvastatin and a high-cholesterol diet from the first AMI until sacrifice. Serial CMR analysis was performed on day3 post-AMI, prior- (day40) and post-RE-AMI (day43). No differences were detected in edema formation in both animal groups during AMI and RE-AMI. Gadolinium DE-CMR revealed smaller infarcts in IV-atorva-treated animals at index event at 3days and 40days post-AMI compared to vehicle-administered pigs (p<0.05). CMR analyses post-RE-AMI revealed smaller infarcts in the animals treated with IV-atorva at index event than in the vehicle-administered pigs. These IV-atorva at index event benefits were associated with higher LVEF and normal LV wall motion in the jeopardized myocardium at RE-AMI (p<0.05 vs. vehicle). The scar region of RE-AMI of animals treated with IV-atorva at index event showed reduced cardiac inflammatory infiltrate, apoptosis and senescence activation, and increased reparative fibrosis and neovessel formation vs. vehicle-administered pigs. Animals treated with IV-atorva at index event also showed lower CRP and higher IL-10 plasma levels in the setting of RE-AMI.

Conclusions: The cardioprotection afforded by IV-atorva administration during an index-AMI event shows a legacy effect attenuating myocardial damage and preserving cardiac contractile function upon RE-AMI. The potential benefits of this intravenous approach should be tested in the clinical setting.