© 2002 by European Society of Cardiology
Copyright © 2002, European Society of Cardiology
Pharmacological possibilities for protection against myocardial reperfusion injury
aDepartment of Integrative Pharmacology, AstraZeneca R&D, Mölndal, Sweden
bDepartment of Cardiology, Karolinska Hospital, Box 60500, S-171 76 Stockholm, Sweden
* Corresponding author. Tel.: +46-8-5177-5876; fax: +46-8-311-044 john.pernow{at}ks.se
Reperfusion through thrombolysis or percutananeous coronary angioplasty is standard treatment in impending acute myocardial infarction. Although restoration of blood flow to the jeopardised myocardial area is a perquisite for myocardial salvage, reperfusion itself may lead to accelerated and additional myocardial injury beyond that generated by ischemia alone. This is referred to as the "reperfusion injury". Since the reperfusion injury is initiated by the treatment of myocardial infarction, it is of importance to limit the extent of the injury. Several studies aimed at preventing reperfusion injury by means of pharmacological agents have therefore been conducted. The design of such studies is crucial for the results. Factors of importance are the timing of drug administration, animal species used, the degree of collateral flow and the duration of ischemia. A variety of pharmacological compounds have been investigated in different experimental models of myocardial ischemia and reperfusion. These include oxygen free radical scavengers, antioxidants, calcium channel blockers, inhibitors of neutrophils, nitric oxide, adenosine-related agents, inhibitors of the renin-angiotensin system, endothelin receptor antagonists, Na+/H+ exchange inhibitors, and anti-apoptotic agents. All these groups of pharmacological agents have been demonstrated to protect from reperfusion injury determined as limitation of infarct size, improved myocardial and endothelial function, and reduced incidence of arrhythmias. The mechanism behind the protective effect may differ between different groups of compounds, but some compounds may exert cardioprotection via common pathways. Such a pathway may be via maintained bioavailability of nitric oxide.
KEYWORDS Reperfusion; Free radicals; Nitric oxide; Endothelins; Na/H-exchanger; Angiotensin; Leukocytes
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