The paradoxes of reperfusion in the ischemic heart
نویسندگان
چکیده
Although reperfusion is essential for salvage of the ischemic heart, reperfusion beyond a certain period of ischemia may cause injury to the myocardium. Dramatic changes in contractile function, arrhythmias, and ultrastructure occur in the ischemic-reperfused heart as a consequence of the generation of oxyradicals, loss of cation homeostasis, depletion of energy stores, and changes in subcellular activities. These acute effects of reperfusion appear to be the result of the occurrence of oxidative stress and intracellular Ca2þ overload in the heart. Alterations in cardiac gene expression may account for delayed recovery of subcellular organelles in the ischemic myocardium. Heart Metab. 2007;37:31–34.
منابع مشابه
The Effect of Verapamil Administred before the Reperfusion Insult in Isolated Preconditioned Rat Heart on the Microsomal ATPase and Mitochondrial Enzyme Activities
Background: Calcium overload and free radical mediated damage in the mitochondria is the most important pathological changes associated with myocardial ischemic-reperfusion injury. The verapamil post-treatment has been previously reported to prevent reperfusion-induced myocardial injury but functional recovery may be delayed due to the drug's inherent direct myocardial depression effect. In the...
متن کاملIncrease of uncoupling protein-2 expression in the ischemic rat heart
Introduction: Reactive oxygen species (ROS) have been suggested to play an important role in the myocardial damage induced by ischemia – reperfusion. One element believed to be activated by ROS and to contribute to the reduction of ROS production, is the uncoupling protein-2 (UCP2). The objective of this investigation was to explore the effect of myocardial ischemia reperfusion on cardiac UC...
متن کاملThe effect of asafoetida essential oil on myocardial ischemic-reperfusion injury in isolated rat hearts
Objective: Previous studies reported that asafetida from Ferula assa-foetida Linn. species and its essential oil (AEO) have antioxidant effects. In the present study, the effect of AEO was evaluated on ischemic-reperfusion injury in isolated rat hearts. Materials and Methods: Forty-eight male Wistar rats were divided into 6 groups: 1) control group, 2) vehicle group, 3-5) AEO groups and, 6) car...
متن کاملLiver ischemia preconditions the heart against ischemia-reperfusion arrhythmias
Objective(s):This study aimed to examine the hypothesis that an antiarrhythmic effect might be obtained by ischemic preconditioning of the liver, and also to characterize the potential underlying mechanisms. Materials and Methods: Male Wistar rats were anesthetized by thiopental sodium (50 mg/kg, IP) followed by IV injection of heparin (250 IU). Remote ischemic preconditioning (RIPC) was induce...
متن کاملEffect of endogenous nitric oxide on cardiac ischemic preconditioning in rat
Introduction: Ischemic Preconditioning (IPC) is the phenomen that happens on the heart by one or several short periods of ischemia followed by reperfusion that improve the postischemic recovery of mechanical function. Ischemic preconditioning (IPC) may protect the heart from ischemia reperfusion injury by nitric oxide formation. This study investigated the effect of ischemic preconditioni...
متن کاملCardioprotective Effect of Garlic Juice on the Isolated Rat Heart in Ischemia- Reperfusion
Background: It has been reported that the chronic oral administration of garlic homogenate protected the rat heart from in vitro ischemic reperfusion injury. However, the biological effects of garlic juice on the heart are expected to be different from oral administration of it. Objective: the present study was designed to investigate the effect of garlic juice on the isolated rat heart in is...
متن کامل