顽固性感染性休克相关心功能不全患者的血流动力学研究

目的 分析顽固性感染性休克相关心功能不全患者的血流动力学.方法 北京协和医院加强医疗科收治的70例顽固性感染性休克患者在放置肺动脉导管(PAC)之前均放置了中心静脉导管并进行了复苏治疗,放置PAC后进行血流动力学最佳化治疗,记录放置肺动脉导管即刻的心率、平均动脉压(MAP)、中心静脉压(CVP)、肺动脉压(PAP)、肺动脉阻塞压(PAOP)、心输出量(CO)、心脏指数(CI)、体循环阻力指数(SVRI)、肺循环阻力指数(PVRI)、混合静脉血氧饱和度(S-vO2)、氧输送(DO2I)、氧消耗(VO2I)、氧摄取率(O2ext)、APACHEII评分、动脉血乳酸水平和24h乳酸清除率以及诊断后第28天生存状况.结果 (I)70例顽固性感染性休克患者中,26例(37.1%)患者出现了心功能不全,44例患者未出现心功能不全;出现心功能不全者年龄大于未出现心功能不全者(P=0.038),CVP、PAOP、PAP、SVRI、PVRI、O2ext明显高于未出现心功能不全者,CO、CI、DO:I、S-v O2明显低于未出现心功能不全者,差异有统计学意义.(2)70例顽固性感染性休克患者28 d死亡42例(28 d病死率为60%),存活28例(40%);其中未出现心功能不全者中死亡25例(56.8%),出现心功能不全者中死亡17例(65.4%).(3)未出现心功能不全者中,死亡者动脉血乳酸水平、APACHEII评分、心率高于存活者,24 h乳酸清除率低于存活者(P<0.05).(4)在出现心功能不全者中,死亡者APACHEn评分高于存活者(P<0.01),24 h乳酸清除率、VO:I低于存活者(P<0.05).(5)相关分析:S-v O2与CI呈正相关(r=0.680,P=0.000),CI与D02I呈正相关(r=0.859,P=0.000).结论 (1)顽固性感染性休克合并心功能不全可能是导致患者病死率高的主要因素;(2)顽固性感染性休克合并心功能不全者若CVP或PAOP偏高而S-v O2偏低,结合APACHE II评分高或年龄偏大提示心功能不全,同时,CI下降可能是导致氧输送下降的主要原因;(3)在顽固性感染性休克合并心功能不全患者中,初始动脉血乳酸水平高而24 h乳酸清除率低提示预后差.

The hemodynamic investigation of refractory septic shock-related cardiac dysfunction

Objectlve To research and analyze the hemod)rnamic status of refractory septic shock associated cardiac dysfunction.Methods 70 refractory septic shock patients were studied.In the duration of pulmonary artery catheter(PAC)-directed hemodynamic optimization,the patients were divided into a cardiac dysfunction group and a control group.Hemodynamic parameters,arterial blood lactate concentration and APACHE II scores were obtained instantly after the placement of a PAC,then lactate clearance in 24 hours was surveyed and calculated.Subsequently the two groups of patients were regrouped by nonsurvivor and survivors respectively.All the obtained values were analyzed with statistic methods.Results 37% of the refractory septic shock patients was complicated with cardiac dysfunction.The age of the patients complicated with cardiac dysfunction was significantly higher than that of the patients of the control group.Central venous pressure(CVP),pulmonary artery obstruction pressure(PAOP),pulmonary artery pressure (PAP),systemic vascular resistance index(SVRI),pulmonary vascular resistance index(PVRI)and oxygen extraction ratio(O2ext)in the cardiac dysfunction group were significantly different from those in the control group.Cardiac output(CO),cardiac index(CI),oxygen delivery index(DO2I)and mixed venous oxygensaturation(S-v O2)were significantly lower than those of the patients in the control group.S -v O2 had a strong correlation witIl CI.If the patients were regrouped by nonsurvivors and survivors.in the patients complicated with cardiac dysfunction APACHE II scores were significantly higher in the nonsurvivors than survivors:the lactate clearance in 24 hours(median-25%)of the nonsurvivors was significantly lower than that of nonresponders(median 22%),P＜0.05.Conclusion (1)In refractory septic shock patients,cardiac dysfunction maybe the main reason leading to bad outcome.(2)Higher CVP and PAOP and lower S -v O2 indicate the onset of cardiac dysfunction.(3)The patients with significantly high initial arterial blood lactate level and the low lactate clearance in 24 hours had bad outcome.