Effect of ATP-dependent channel modulators on ischemia-induced arrhythmia change depending on age and gender

Abstract

The number of ATP-dependent potassium channels in myocardial cells has been previously shown to change depending on gender and age. Different effects of the ATP-dependent potassium channel blocker, glybenclamide and ATP-dependent potassium channel opener, pinacidil on ischemia or reperfusion-induced arrhythmia observed in various research might depend on different ages and genders of the animals used. The aim of this study is to research the effect of ATP-dependent potassium channel modulators on ischemia-induced arrhythmia in animals of different ages and genders. Sprague-Dawley rats of different ages and genders were used in this study. Ischemia was produced by the ligation of the left coronary artery for 30 min. Electrocardiogram (ECG), blood pressure, infarct area and blood glucose were determined during the 30 min of ischemia. An arrhythmia score from an ECG recorded during 30 min of ischemia was determined by examining the duration and type of arrhythmia. Different effects of glybenclamide and pinacidil on the arrhythmias were observed in male and female young and middle-age rats. Pinacidil decreased the infarct zone in younger female rats, but differences in the type and length of ischemia-induced arrhythmias between females and males disappeared in older age. The results of this study showed that the effect of ATP-dependent potassium channel modulators on ischemia-induced arrhythmia changed due to the age and gender of rats.

Protective effect of propolis on myocardial ischemia/reperfusion injury in males and ovariectomized females but not in intact females

“…In the present study, the arrhythmias score, myocardial infarct size, the duration of total arrhythmias, VPC, VT, and the incidence of VPC were lower in the intact females than in the males, indicating that the female hearts could exert more resistance to mI/R injury than the male hearts. Our results are consistent with data obtained in previous studies (Bozdogan et al, 2013; Brown et al, 2005; Chen et al, 2013). In females, the protective effect against mI/R injury can disappear over time due to estrogen deprivation.…”

A bibliometric analysis of myocardial ischemia/reperfusion injury from 2000 to 2023

“…The underlying cause may be related to the instability of action potential resulting from the inability of mitochondria to recover or maintain their inner membrane potential after prolonged ischemia ( 39 – 41 ). Moreover, this phenomenon is more common and severe in elderly female rats ( 42 ), which may be associated with the decline of estrogen receptors and antioxidant activity in their myocardium, rather than the decrease in serum estrogen levels ( 43 ).…”