title: The effect of captopril and losartan on the electrophysiology of myocardial cells of myocardial ischemia rats.
abstract: OBJECTIVE
  This study aims to investigate the effect of captopril and losartan on the electrophysiology of myocardial cells parameters in ventricular vulnerable period and effective refractory period of myocardial ischemia rats.
  
  
  METHODS
  96 wistar rats were enrolled in the study and divided into six groups: Captopril myocardial ischemia group, losartan myocardial ischemia group, myocardial ischemia control group, captopril normal group, losartan normal group and normal control group (n=16). We observed morphological changes of myocardial tissue in each group. The cardiac electrophysiological parameters in effective refractory period of each group were measured. Creatine kinase (CK), alanine aminotransferase (GOT), lactate dehydrogenase (LDH), the expression of Cardiotrophin 1 (CT-1) and malonaldehyde (MDA) were detected.
  
  
  RESULTS
  Compared the losartan and captopril group with the control group, (P<0.05). Losartan and captopril can shorten the ventricular vulnerable period of the normal group and ischemic group. There was no interaction effect between losartan and captopril group and the acute myocardial ischemia group. The effect of losartan and captopril on time window in ventricular vulnerable period showed that compared with the control group (P<0.05). Losartan and captopril had a significant effect on prolonged effective refractory period of normal and ischemic rats. There was no interaction effect between losartan and captopril group and the acute myocardial ischemia group. Compared with the myocardial ischemia control group, CK, GOT, LDH and MDA decreased in captopril and losartan myocardial ischemia groups (P<0.05).
  
  
  CONCLUSIONS
  Losartan and captopril had a significant effect on prolonged effective refractory period and shorten ventricular vulnerable period, they can also effectively prevent arrhythmias.
authors: Department of Cardiology, Chinese PLA General Hospital 28 Fuxing Road, Haidian District, Beijing 100853, P.R. China.
authors: Xiangmin
authors: X
authors: Shi
authors: Department of Cardiology, Chinese PLA General Hospital 28 Fuxing Road, Haidian District, Beijing 100853, P.R. China.
authors: Zhaoling
authors: Z
authors: Shan
authors: Department of Cardiology, Chinese PLA General Hospital 28 Fuxing Road, Haidian District, Beijing 100853, P.R. China.
authors: Hongtao
authors: H
authors: Yuan
authors: Department of Cardiology, Chinese PLA General Hospital 28 Fuxing Road, Haidian District, Beijing 100853, P.R. China.
authors: Hongyang
authors: H
authors: Guo
authors: Department of Cardiology, Chinese PLA General Hospital 28 Fuxing Road, Haidian District, Beijing 100853, P.R. China.
authors: Yutang
authors: Y
authors: Wang
keywords: Losartan; captopril; myocardial ischemia; rats