Objective: To investigate the electrophysiological changes of autonomic cells in left ventricular outflow tract in guinea pigs with iron deficiency anemia complicated with chronic heart failure.Methods: Guinea pigs mo...Objective: To investigate the electrophysiological changes of autonomic cells in left ventricular outflow tract in guinea pigs with iron deficiency anemia complicated with chronic heart failure.Methods: Guinea pigs model of iron deficiency anemia complicated with chronic heart failure in 10 guinea pigs of the experimental group was made by feeding a low iron diet,pure water and subcutaneous injection of isoproterenol. The control group consisting of 11 guinea pigs was given normal food, normal water and injected with normal saline. The left ventricular outflow tract model specimen was also prepared. The standard microelectrode technique was used to observe electrophysiological changes of autonomic cells in the outflow tract of left ventricular heart failure complicated with iron deficiency anemia in guinea pig model. The indicators of observation were maximal diastolic potential, action potential amplitude, 0 phase maximal depolarization velocity, 4 phase automatic depolarization velocity, repolarization 50% and 90%, and spontaneous discharge frequency.Results: Compared with the control group, 4 phase automatic depolarization velocity,spontaneous discharge frequency and 0 phase maximal depolarization velocity decreased significantly(P < 0.01) and action potential amplitude reduced(P < 0.01) in model group. Moreover, repolarization 50% and 90% increased(P < 0.01).Conclusions: There are electrophysiological abnormalities of the left ventricular outflow tract in guinea pigs with iron deficiency anemia complicated with heart failure.展开更多
钙/钙调蛋白依赖性蛋白激酶Ⅱ(Calcium/Calmodulin-dependent protein kinase Ⅱ,CaMKⅡ)是一种主要表达于心脏中的细胞信号分子,氧化激活的CaMKⅡ与多种致心律失常心脏疾病密切相关。为了分析氧化CaMKⅡ对于细胞电生理的影响,结合CaMK...钙/钙调蛋白依赖性蛋白激酶Ⅱ(Calcium/Calmodulin-dependent protein kinase Ⅱ,CaMKⅡ)是一种主要表达于心脏中的细胞信号分子,氧化激活的CaMKⅡ与多种致心律失常心脏疾病密切相关。为了分析氧化CaMKⅡ对于细胞电生理的影响,结合CaMKⅡ激活的生物化学动力学特征,开发了氧化CaMKⅡ人类心室细胞模型,模拟仿真研究活性氧(Reactive oxygen species,ROS)增强情况下,离子电流、细胞内钙循环和细胞膜动作电位的变化。仿真结果发现,当ROS的浓度升高时,CaMKⅡ的激活量增加,细胞质和肌浆网钙离子浓度升高,动作电位缩短。本模型为研究CaMKⅡ致心律失常提供了量化分析手段,构建了微观分子功能改变与宏观细胞动作电位变化之间的定量关系,具有重要的理论和应用价值。展开更多
基金supported by Zhangjiakou Project of Science and Technology Studies and Development Planning(Grand No.1321078D)
文摘Objective: To investigate the electrophysiological changes of autonomic cells in left ventricular outflow tract in guinea pigs with iron deficiency anemia complicated with chronic heart failure.Methods: Guinea pigs model of iron deficiency anemia complicated with chronic heart failure in 10 guinea pigs of the experimental group was made by feeding a low iron diet,pure water and subcutaneous injection of isoproterenol. The control group consisting of 11 guinea pigs was given normal food, normal water and injected with normal saline. The left ventricular outflow tract model specimen was also prepared. The standard microelectrode technique was used to observe electrophysiological changes of autonomic cells in the outflow tract of left ventricular heart failure complicated with iron deficiency anemia in guinea pig model. The indicators of observation were maximal diastolic potential, action potential amplitude, 0 phase maximal depolarization velocity, 4 phase automatic depolarization velocity, repolarization 50% and 90%, and spontaneous discharge frequency.Results: Compared with the control group, 4 phase automatic depolarization velocity,spontaneous discharge frequency and 0 phase maximal depolarization velocity decreased significantly(P < 0.01) and action potential amplitude reduced(P < 0.01) in model group. Moreover, repolarization 50% and 90% increased(P < 0.01).Conclusions: There are electrophysiological abnormalities of the left ventricular outflow tract in guinea pigs with iron deficiency anemia complicated with heart failure.
