目的 探讨反比通气对单肺通气老年患者肺功能和脑氧饱和度的影响.方法 选取择期拟行食管癌根治术的老年患者60例,随机分为试验组(A组)和对照组(B组),每组30例,两组双肺通气期间VT 7 mL/kg,I:E=1:2.单肺通气期间调整A组I:E为1.5:1,B组不变,于双肺通气15 min(T1)、单肺通气20 min(T2)、单肺通气60 min(T3)、恢复双肺通气15 min(T4)进行血气分析,记录血流动力学、呼吸力学指标和脑组织氧饱和度(rSO2).结果 与B组比较,A组T2~T4时PaO2、Pmean和Cdyn升高,Ppeak、VD/VT降低(P<0.05);单肺通气期间,A组rSO2<50%或rSO2降低>20%的发生率低于B组(P<0.05);与T1时比较,两组在T2~T4时点PaO2、Cdyn、rSO2降低(P<0.05),Ppeak、Pmean、PaCO2、VD/VT升高(P<0.05).结论 老年患者单肺通气期间采用反比通气可以降低术中气道峰压,改善氧合,增加肺顺应性,减轻rSO2的下降程度.%Objective To investigate the effects of inverse ratio ventilation on pulmonary function and ce-rebral oxygen saturation in elderly patients with single lung ventilation.Methods Sixty patients scheduled for elec-tive radical resection of esophageal cancer were divided into 2 groups(n=30 for each group)using a random num-ber table:the experiment group(group A)and the control group(group B). During the two lung ventilation,the ventilator parameters were set as tidal volume(VT)7 mL/kg,inspiratory to expiratory ratio 1:2. During one lung ventilation,the I:E ratio was 1.5:1 in the group A and 1:2 in the group B. At 15 min after two lung ventilation (T1),20 min after one lung ventilation(T2),60 min after one lung ventilation(T3)and 15 min after restarting two-lung ventilation(T4),the blood gas analysis was measured and recorded for the hemodynamics,respiratory me-chanics index and cerebral oxygen saturation respectively. Results Compared with the B group,the Ppeak and VD/VT at T2~T4in the group A were lower while PaO2,Pmean and Cdyn were higher(P<0.05).During one lung ventilation,the incidence of rSO2< 50% or rSO2decreased more than 20% in the group A was lower than that in the group B(P<0.05).The PaO2,Cdyn and rSO2of the two groups at T2~T4were significantly lower and Ppeak, Pmean,PaCO2,VD/VT were significantly higher than the baseline(T1)(P < 0.05). Conclusion During one-lung ventilation,prolonged inspiratory time can improve pulmonary function and lung compliance without increas-ing peak airway pressure,reduce the decline of rSO2 at the same time.
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