OBJECTIVES This study sought to delineate salvage-dependent from salvage-independent coronary reperfusion in acute myocardial infarction and the effects on spontaneously occurring arrhythmias and arrhythmic death in rats. BACKGROUND Reperfusion of the infarct-related artery might increase electrical stability independently of salvage of ischemic myocardium. METHODS In 98 conscious rats the ...

genesis of ischemia and reperfusion injury in the myocardium. Recent studies have suggested that a massive Ca influx may occur as a consequence of Na –Ca exchange via the sodium–calcium exchanger (NCX) during reperfusion which, in turn, may be caused by an accumulation of Na via the sodium–hydrogen exchanger (NHE) during ischemia. This results in an intracellular Ca overload, the detrimental ef...

Losartan, a selective angiotensin II (AII) type I receptor antagonist, may protect against myocardial stunning and arrhythmia in ischemia and reperfusion. To examine the cellular basis for these protective actions, we studied effects of losartan and AII on contractile and electrical activity of ventricular myocytes exposed to simulated ischemia and reperfusion. Ionic currents were measured with...

During myocardial ischemia and reperfusion, nitric oxide ((.)NO) was shown to exert either beneficial or detrimental effects. Uncoupled (.)NO synthases (NOS) can generate superoxide anion under suboptimal concentrations of substrate and cofactors. The aim of our study was to investigate the role of NOS modulation on 1) the evolution of functional parameters and 2) the amount of free radicals re...

A six new analogs of MG-1(S), 1-[2-hydroxy-3-(4-phenyl-1-piperazinyl)propyl]-pyrrolidin-2-one, with adrenolytic properties were tested for electrocardiographic and antiarrhythmic activity in model ventricular arrhythmias associated with coronary artery occlusion and reperfusion in the non-working isolated perfused rat heart and additionally in barium chloride-induced arrhythmia in vivo. All tes...

Despite the advance in treatment of acute myocardial infarction (MI) with timely reperfusion of ischemic myocardium, coronary artery disease remains a leading cause of morbidity and mortality worldwide. In patients who have survived acute MI, the heart undergoes a remodeling process characterized by changing in size, shape, structure, and function. The progressive ventricular dilation, wall thi...

Ischemic preconditioning (IP) was originally defined as the enhancement of myocardial tolerance against infarction induced by a brief sublethal episode of ischemia in experimental animals (1,2). Subsequently, the concept of IP was expanded and currently includes protection against myocardial stunning, arrhythmia, and vascular dysfunction after ischemia/reperfusion injury (3–6). Results of clini...

Background and Objective: Acute myocardial infarction (MI) is caused due to coronary artery occlusion and divided into two forms of ST-elevation (STEMI) and non-ST-elevation (NSTEMI) myocardial infarction. This study aimed to determine the success rate of treatment with primary PCI (percutaneous coronary intervention) versus thrombolysis in the establishment of perfusion and to evaluate the sho...