婴儿深低温体外循环术后肺表面活性物质的变化

目的 比较婴儿先天性心脏病在深低温停循环(DHCA)或深低温低流量(DHLF)下行心内直视手术后肺表面活性物质(PS)活性水平的变化. 方法 根据采用的体外循环(CPB)方法不同,将20例室间隔缺损伴肺动脉高压的婴儿分为DHCA组和DHLF组,每组10例.测定CPB前,CPB结束5分钟和2小时时PS活性水平的饱和卵磷脂/总磷脂(SatPC/TPL)和饱和卵磷脂/总蛋白(SatPC/TP)值和肺静态顺应性. 结果 DHLF组术后住ICU时间明显长于DHCA组(P<0.05), DHLF组术后SatPC/TPL、SatPC/TP和肺静态顺应性下降的幅度均明显大于DHCA组(P<0.01). 结论 DHLF较DHCA更能引起PS活性水平的降低,从而引起更严重的肺损伤.

Changes of pulmonary surfactant activity after deep hypothermic cardiopulmonary bypass in infants

Objective To compare the changes between deep hypothermic circulatory arrest (DHCA) with deep hypothermic low flow (DHLF) cardiopulmonary bypass (CPB) on pulmonary surfactant (PS) activity in infants with congenital heart disease. Methods Twenty infants with ventricular septum defect and pulmonary hypertension were assigned to either DHCA group or DHLF group according to the CPB methods respectively. Measurements of saturated phosphatidylcholine /total phospholipids (SatPC /TPL), saturated phosphatidylcholine/ total protein (SatPC/TP) and static pulmonary compliance were performed before institution of CPB, 5 minutes after cessation of CPB and 2 hours. Results The length of ICU stay in DHLA group was significantly longer ( P <0 05) than that in DHCA group. SatPC/TPL, SatPC/TP and static pulmonary compliance in DHLF group were significantly lower compared with DHCA group ( P <0.01). Conclusion DHLF could lower the PS activity level significantly as compared with DHCA in infants with congenital heart disease.