尼群地平在体外循环中对红细胞的保护作用

研究体外循环中红细胞钙与损伤的关系及钙拮抗剂对红细胞的保护作用。方法：４０例非紫绀型先天性心脏病病人随机均分为对照组与尼群地平组尼群地平组术前７日口服尼群地平，每次０．５ｍｇ／ｋｇ，每８小时１次，测定围体外循环期红细胞钙，Ｃａ＾２＋，Ｍｇ＾２＋，ＡＴＰａｓｅ与Ｎａ＾＋，Ｋ＾＋－ＡＴＰａｓｅ活性、观察红细胞形态变化。

Protective Effect of Nitrendipine on Erythrocytes during Cardiopulmonary Bypass

Aim:This stady was conducted to evaluate the relationship between erythrocyte injury and calcium,and the protective effect of calcium antagonists on erythrocytes during cardiopulmonary bypass(CPB).Clinical material and method:Forty patients with congenital heart disease underwent surgical repair under CPB.The patients were randomly divided into two groups.Control group(n=30)received no medications before surgery.Nitrendipine group received nitrendipine(0.5mg/kg,t.i.d)orally seven days before surgery.The blood samples were taken at five different time intervals for assessing the content of erythrocytes calcium(E Ca 2 ), activities Ca 2 Mg 2 ATPase,Na K ATPase,index filtration of erythrocytes(IF),mean corpuscular volume(MCV)and plasma free hemoglubin(F HB).Results:In control group,E Ca 2 ,IF,MCV and F Hb were gradually increased and activities Ca 2 Mg 2 ATPase and Na K ATPase were decreased .The reduction of E Ca 2 was closely related to IF,MCV and F Hb.In nitrendipine group,all abovementioned parameters were significantly improved.Conclusion:This study suggests that erythrocyte injury is related to elevation of intracellular calcium during CPB and preoperative treatment with nitrendipine can reduce erythrocyte injury.