Protective Effects of Estradiol on Myocardial Contractile Function Following Hemorrhagic Shock and Resuscitation in Rats

作     者：Mona Soliman Soliman Mona

作者机构：Department of Physiology Colrege of Medicine King Saud University Riyadh 11461 Saudi Arabia 

出 版 物：《Chinese Medical Journal》 (中华医学杂志（英文版）)

年 卷 期：2015年第128卷第17期

页      面：2360-2364页

核心收录：

学科分类：0710[理学-生物学] 1002[医学-临床医学] 07[理学] 071002[理学-动物学] 071003[理学-生理学] 

基　　金：supported by a grant from the Research Groups at Deanship of Scientific Research at King Saud University  Riyadh  Saudi Arabia 

主　　题：Contractility Heart Hemorrhage Rats Resuscitation 

摘      要：Background： Hemorrhagic shock （HS） results in myocardial contractile dysfunction. Studies showed that 17β-estradiol protects the myocardium against contractile dysfunction. The study investigated the cardioprotective effects of treatment with 17β-estradiol before resuscitation following 1 h of HS and resuscitation. Methods： Male Sprague-Dawley rats were assigned to 2 sets of experimental protocols： Ex vivo and in vivo treatment and resuscitation. Each set had three experimental groups （n = 6 per group）： Normotensive （N）, HS and resuscitation （HS-R） and HS rats treated with 17β-estradiol （E） and resuscitated （HS-E-R）. Rats were hemorrhaged over 60-rain to reach a mean arterial blood pressure of 40 mmHg. In the ex vivo group, hearts were resuscitated by perfusion in the Langendorff system. In the 17β-estradiol treated group, 17β-estradiol 280 μg/kg was added for the first 5 min. Cardiac function was measured. Left ventricular generated pressure （LVGP） and ＋dP/dt were calculated. In the in vivo group, rats were treated with 17β-estradiol 280 ±g/kg s.c. after 60-rain HS. Resuscitation was performed in vivo by the reinfusion of the shed blood for 30-min to restore normotension. Results： Treatment with 17β-estradiol before resuscitation in ex vivo treated and resuscitated isolated hearts and in the in vivo treated and resuscitated rats following HS improved myocardial contractile function. In the in vivo treated group, LVGP and ＋dP/dt max were significantly higher in 17β-estradiol treated rats compared to the untreated group （LVGP 136.40 ± 6.61 compared to 47.58 ± 17.55, and ＋dP/dt 661.85 ± 49.88 compared to 88.18 ± 0.85）. Treatment with 17β-estradiol improved LVGP following HS. Conclusions： The results indicate that treatment with 17β-estradiol before resuscitation following HS protects the myocardium against dysfunction.