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Öğe Effect of ATP-dependent channel modulators on ischemia-induced arrhythmia change depending on age and gender(Royal Soc Medicine Press Ltd, 2013) Bozdoğan, Ömer; Kaya, Salih Tunç; Yaşar, Selçuk; Orallar, HayriyeThe 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.Öğe The effect of intermittent fasting and water restriction on myocardial ischemia/reperfusion-induced arrhythmia in rats(Tubitak Scientific & Technical Research Council Turkey, 2012) Kaya, Salih Tunç; Bozdoğan, ÖmerAim: To investigate the effect of intermittent fasting and water restriction on ischemia/reperfusion-induced arrhythmias. Materials and methods: Six minutes of ischemia followed by 6 min of reperfusion was produced by the ligation and then releasing of the left coronary artery. Intermittent fasting and water restriction were applied during 1 month for 12 h/day. The duration, type, and incidence of arrhythmias during reperfusion and the survival rate at the end of reperfusion were determined and compared. Results: The score of arrhythmia that was determined using the type and duration of arrhythmia did not show significant differences among groups. The arrhythmic period was significantly longer in animals subjected to 1 month of intermittent water and food restriction. The risk of ischemic zone was found to be significantly larger in the animals subjected to 1 month of normal feeding after 1 month of food and water restriction. Conclusion: Intermittent fasting and water restriction was not found to be effective in decreasing the arrhythmia that occurred during 6 min of myocardial reperfusion in rats. Since there is no other study compatible with the present study, further research is required on the effect of intermittent fasting and water restriction on ischemia/reperfusion-induced arrhythmia and on the risk of an ischemic zone.Öğe The Effect of Long Termand Acute Administration of Genistein on Ischemia-reperfusion-induced Arrhythmia(Wiley-Blackwell, 2016) Ekşioğlu, Didem; Erim, Firdevs; Bozdoğan, Ömer; Özarslan, Oğulcan Talat; Orallar, Hayriye Soytürk; Kaya, Salih Tunç; Yaşar, Selçuk…Öğe The Effect of Resveratrol and Glibenclamide on Ischemia/Reperfusion Induced Arrhythmias in STZ-induced Diabetic Rats(Wiley-Blackwell, 2016) Kaya, Salih Tunç; Özaslan, Oğulcan Talat; Ekşioğlu, Didem; Erim, Firdevs; Yaşar, Selçuk; Bozdoğan, Ömer…Öğe The effects of ATP-dependent potassium channel opener; pinacidil, and blocker; glibenclamide, on the ischemia induced arrhythmia in partial and complete ligation of coronary artery in rats(Mashhad Univ Med Sciences, 2015) Yaşar, Selçuk; Bozdoğan, Ömer; Kaya, Salih Tunç; Orallar, Hayriye SoytürkObjective(s): Electrical inhomogeneity between ischemic and non ischemic myocardium is the basis of arrhythmia which occurs following coronary artery occlusion. The leakage of potassium from the ischemic region to the non ischemic region is very effective in the generation of these arrhythmias. The aim of this study is to research the effect of ATP-dependent potassium (K-ATP) channel blocker (glibenclamide) and opener (pinacidil) on ischemia induced arrhythmia in the presence of small and large infarct sizes. Materials and Methods: In this study Sprague-Dawley male rats of 8-9 months of age were used. Ischemia was produced by the partial ligation of left coronary artery ramus descending (PL) for smaller infarct and complete ligation of this artery (CL) for larger infarct for 30 min. The arrhythmia score which was calculated from the duration and type of arrhythmia was significantly higher in animals which had a larger infarct area than the animals which had a smaller infarct. Results: Glibenclamide increased the rate of arrhythmia in animals having smaller infarct but not in animals having larger infarct. Pinacidil did not affect the occurrence of arrhythmia in either group. There was a significant difference in the infarct size and risk of infarct zone between animals which had small and large infarct sizes. The effect of glibenclamide and pinacidil on the arrhythmias differed depend on decrease of infarct size. Conclusion: Glibenclamide is not effective to decrease ischemia induced arrhythmia in the presence of small and pinacidil in large ischemic zone.Öğe The protection of resveratrol and its combination with glibenclamide, but not berberine on the diabetic hearts against reperfusion-induced arrhythmias: the role of myocardial K-ATP channel(Taylor & Francis Ltd, 2019) Kaya, Salih Tunç; Bozdoğan, Ömer; Özarslan, Talat O.; Taşkın, Eylem; Eksioğlu, Didem; Erim, Firdevs; Yaşar, SelçukContext: Cardiovascular dysfunctions such as life-threatening arrhythmias are one of the main reasons of mortality and morbidity in diabetic patients Objective: We aimed to investigate the long-term effects of resveratrol, berberine and glibenclamide combinations on the ischemia/reperfusion (I/R) induced arrhythmias in streptozotocin (STZ)-induced diabetic rats and to investigate the role of myocardial K-ATP channel in the possible anti-arrhythmic actions of the treatments. Methods: Two days after induction of diabetes, diabetic rats were treated with resveratrol [5 mg/kg, intraperitoneally (i.p.)], berberine (10 mg/kg, i.p) and glibenclamide (5 mg/kg, i.p) for 6 weeks. On the 43th day, experimental animals were subjected to 6-min ischemia and 6-min reperfusion in vivo. Results: The protein expression of Kir6.2 subunits was downregulated in the diabetic hearts. However, all drug treatments restored the protein expression of Kir6.2 subunits. Resveratrol alone and its combination with glibenclamide decreased the arrhythmia score, the arrhythmic period and the incidence of other types of arrhythmias during the reperfusion period. Conclusions: The combination of resveratrol with glibenclamide may alleviate reperfusion-induced arrhythmias via an underlying mechanism not be only associated with the restoration of the protein expression of Kir6.2 subunits but also associated with the other subunits or ion channels underlying cardiac action potential.Öğe Short-term diabetes decreases ischemia reperfusion-induced arrhythmia: the effect of alpha-2 blocker yohimbine and glibenclamide(Tubitak Scientific & Technical Research Council Turkey, 2016) Bozdoğan, Ömer; Kaya, Salih Tunç; Yaşar, Selçuk; Baş, Erçin Çağdaş; Özarslan, Oğulcan Talat; Ekşioğlu, Didem; Erim, FirdevsThis study examined the effect of yohimbine alone and in combination with glibenclamide on ischemia and reperfusion-induced arrhythmias in diabetes. Six minutes of ischemia were produced in 1-week diabetic rats by ligation of the left coronary artery, and 6 min of reperfusion were produced by releasing the artery. A dose of 5 mg/kg of yohimbine and glibenclamide was administered for 7 days prior to the coronary ligation. The blood pressure, heart rate, and arrhythmia were determined from the recorded ECG during the 6 min of ischemia and reperfusion and then compared using a one-way ANOVA statistical program and the chi-square test. The score of arrhythmia calculated from the type and duration of arrhythmia decreased in the diabetic rats (3.5 +/- 1.69 in control, 1.7 +/- 0.81 in diabetes group). The arrhythmia score returned to the control value in the rats that were given a combination of yohimbine and glibenclamide (3 +/- 1.73). Yohimbine is used in the treatment of erectile dysfunction; glibenclamide is used as an antidiabetic drug in diabetic patients and may be a risk factor in the increase of ischemia reperfusion-induced arrhythmias.
