空气肺复张对食管癌根治术患者单肺通气后肺组织氧化应激损伤的影响

目的 评价空气肺复张对食管癌根治术患者单肺通气后肺组织氧化应激损伤的影响.方法 择期拟行食管癌根治术患者24例,ASA Ⅱ或Ⅲ级,年龄40～60岁,体重44～65 kg,随机分为2组(n=12),纯氧肺复张组(纯氧组):术中单肺通气结束肺复张时以纯氧膨肺;空气肺复张组(空气组):术中单肺通气结束肺复张时以空气膨肺.于单肺通气开始即刻(T_1)、单肺通气转为双肺通气即刻(T_2)和单肺通气转为双肺通气后30 min(T_3)时,抽取肘静脉血样,测定血浆蛋白羰基浓度,血清丙二醛(MDA)浓度和超氧化物歧化酶(SOD)活性.术后2 h时,抽取桡动脉血样,测定肺氧合指数.结果 与T_1和T_2时比较,纯氧组T_3时血浆蛋白羰基浓度和血清MDA浓度升高,血清SOD活性降低(P<0.05),空气组T_3时各指标差异无统计学意义(P>0.05).与纯氧组比较,空气组T_3时血浆蛋白羰基浓度和血清MDA浓度降低,血清SOD活性升高,术后2 h时肺氧合指数升高(P<0.05).结论 空气肺复张可减轻食管癌根治术患者单肺通气后肺组织氧化应激损伤,对术后肺功能具有一定的保护作用.

Re-expansion of the collapsed lung with room air mitigates oxidative stress injury following one-lung ventilation during esophageal cancer resection

Objective To determine whether re-expansion of the collapsed lung with room air can attenuate oxidative stress injury following one-lung ventilation during esophageal cancer resection. Methods Twenty-four ASA Ⅰ or Ⅱ patients aged 40-60 yr weighing 44-65 kg undergoing esophageal cancer resection were randomly divided into 2 groups (n=12 each) : room air group and pure oxygen group. Anesthesia was induced with midazolam, fentanyl, etomidate and atracurium and maintained with propofol and atracurium infusion and intermittent iv boluses of fentanyl. Right or left side double-lumen catheter (Fr 35, 37, 39) was inserted in each patient. Correct placement was verified by fiber-optic bronchoscopy. The patients were mechanically ventilated ( V_T 7-10 ml/kg, RR 12-16 bpm, FiO_2 1.0 during one-lung ventilation). P_(ET)CO_2 was maintained at 35-45 mm Hg. SpO_2 was maintained at 95%-100% during one-lung ventilation. Blood samples were collected at the beginning of one-lung ventilation (T_1 ), immediately before re-expansion of the collapsed lung (T_2) and 30 rain after re-expansion of the collapsed lung (T_3) for determination of serum levels of MDA, SOD and plasma level of protein carbonyl. Arterial blood samples were obtained at 2 h after operation for blood gas analysis. Results The plasma protein carbonyl level and serum MDA level were significantly increased while the serum SOD level was significantly decreased at T_3 as compared with thost at T_1 and T_2 in pure oxygen group. No significant change in serum levels of MDA, SOD and plasma level of protein carbonyl occurred during operation in room air group. The oxygenation index was significantly higher at 2 h after operation in room air group than in pure oxygen group. Conclusion Re-expansion of the collapsed lung with room air can attenuate the oxidative stress injury following one-lung ventilation during esophageal cancer resection.