The factors afecting the outcome of severe pneumonia patients treated with venovenous extracorporeal membrane oxygenation
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摘要: 目的:分析重症肺炎患者的病例资料,探讨静脉-静脉体外膜肺氧合(VV-ECMO)治疗的影响因素。方法:采用回顾性病例分析方法。收集我院2018年5月-2020年12月期间行VV-ECMO治疗的全部58例重症肺炎患者的病历资料,按治疗结局,分为存活组和死亡组。记录并比较两组的基线资料、治疗参数和结局,分析启动时机和临床因素对预后的影响。计量资料组间比较采用t检验或非参数检验,计数资料采用χ2检验。结果:30例存活,28例死亡,病死率48.3%。病因学方面,细菌性肺炎占40(69%)例次,流感病毒性肺炎11(19%)例次,其他7(12%)例次。两组差异无统计学意义(P>0.05)。VV-ECMO启动前,存活组和死亡组机械通气的中位数时间分别为(1 vs.2) d(P<0.05);启动前6 h内,两组的PaO2/FiO2分别为(60.54±16.69) mmHg(1 mmHg=0.133 kPa)和(69.22±18.95) mmHg(P>0.05);启动前24 h内,两组的APACHEⅡ评分分别为(28.43±7.77)分和(33.04±7.84)分(P<0.05)。统计显示,存活组从发病到ECMO启动的中位数时间显著低于死亡组,分别为(2 vs.5.5) d(P<0.05)。VV-ECMO治疗期间,两组的平均液体入量分别为(2118.53.0±386.04)和(2642.50±1251.02) mL/d,液体净平衡分别为(-802.20±530.08)和(265.94±2055.66) mL/d(均P<0.05)。存活组的血浆白蛋白水平、血红蛋白浓度、血小板计数,以及右美托咪定和舒芬太尼用量均高于死亡组(P<0.05)。预后方面,存活组和死亡组入住重症监护室(ICU)天数、住院天数均差异有统计学意义(P<0.05),但住院总费用差异无统计学意义(P>0.05)。结论:VV-ECMO启动指征除了参考前期的机械通气时间和氧合指数外,病程和疾病严重程度对预后也有显著性影响。准确把握启动时机有望进一步降低重症肺炎患者的病死率。优化液体管理、合理镇痛镇静、维持正常的血浆白蛋白和血红蛋白浓度可提高治疗的效果。Abstract: Objective:To explore the factors of venoveneous extracorporeal membrane oxygenation(VV-ECMO) therapy in patients with severe pneumonia.Methods:Medical records were reviewed retrospectively in 58 patients with severe pneumonia caused by a variety of etiologies who were treated with VV-ECMO in a tertiary teaching hospital from May 2018 to December2020. Patients were designated into survivor or non-survivor group according to their outcomes. Data of the demographic characteristics, clinical parameters and outcomes were collected and analyzed. Comparison of difference for quanlitative data was performed by using the Student t test or nonparametric test, and categorical data by the Chi-square test. P<0.05 was defined as statistical significance.Results:Thirty patients were survival and 28 died(48.3%). Forty-two cases were confirmed with bacterial pneumonia and 12 influenza viral lung infection, and no significant difference was found in etiological spectrum between the two groups(P>0.05). Prior to VV-ECMO, the median days were 1 day and 2 days from mechanical ventilation to ECMO initiation in the survivor and non-survior groups(P<0.05), respectively. Within 6 and 24 hours to VV-ECMO, the PaO2/FiO2were 60.54±16.69) and(69.22±18.95) mmHg(P>0.05) and the APACHE Ⅱ scores were(28.43±7.77) and(33.04±7.84) points in the two groups(P<0.05), respectively. Moreover, data shown that the median days were 2 days and 5.5 days from attack of disease to VV-ECMO onset in the two groups(P<0.05), and the optimal timing of point was 4 days for VV-ECMO initiation, with more cumulative survival cases. During the period of VV-ECMO therapy, the averaged amount of fluid infusion was 2119 mL/d and 2643 mL/d, and the net fluid balance was-802.2 mL/d and 265.9 mL/d in the survivor and non-survivor groups, respectively(P<0.05). The blood platelet count, hemoglobin and plasma protein concentrations were higher, and the total dosages of sufentanil and dexmedetomidine were larger in the survivor group than in the non-survivor group(P<0.05). Finally, the time spent on VV-ECMO and on ventilator, length of ICU and hospital stay shown indifference between the two groups(P>0.05), but there was no significant difference in the total medical expenses(P>0.05).Conclusion:The indications for VV-ECMO initiation for rescue of patient with severe pneumonia might not only focus on the duration of mechanical ventilation and oxygenation index prior to VV-ECMO, but take into account of the degree of severity and course of the primary illness, prompt initiation of VV-ECMO might have mortality benefit. Optimal fluid management, prudent use of analgesics or sedatives, maintaining normal plasma hemoglobin and albumin levels during VV-ECMO might improve patient outcome.
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