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Preventive Administration of Melatonin Attenuates Electrophysiological Consequences of Myocardial Ischemia
O G Bernikova1, M A Vaykshnorayte2, A O Ovechkin2,3
1Institute of Physiology, Federal Research Center Komi Scientific Centre, Ural Division of Russian Academy of Sciences, Moscow, Russia. bernikovaog@gmail.com.
Abstract:
The effect of preventive administration of melatonin on the arrhythmogenic substrate in the myocardium was studied in the rabbit model of acute ischemia/reperfusion in vivo. The animals treated with melatonin 60 min before ischemia induction had shorter median activation time compared to the control group (p=0.039), less pronounced shortening of repolarization durations in the ischemic zone during coronary occlusion (p=0.008), and more complete recovery of repolarization during reperfusion (p=0.027). In the melatonin group, the dispersion of repolarization was less than in the control group during both ischemic period (p=0.043) and reperfusion (p=0.038). Thus, preventive administration of melatonin mitigated the arrhythmogenic substrate in the heart under conditions of ischemia/reperfusion.
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