血清胱抑素C水平对老年冠状动脉介入术后患者造影剂诱导急性肾损伤发生及其远期预后的影响

目的探讨胱抑素C(CysC)水平对老年冠状动脉介入治疗(PCI)患者术后造影剂诱导的急性肾损伤(CI-AKI)发生及其远期预后的影响。方法前瞻性连续入选2015年3月至2017年12月间在我院心内科接受PCI治疗的老年患者848例,CI-AKI定义为应用碘造影剂48~72 h内血清肌酐升高≥44.2μmol/L,或较基础水平升高25%以上。采用受试者工作特征曲线分析评价CysC预测PCI术后CI-AKI发生的最佳截断值,根据最佳截断值(CysC=1.3 mg/L)分为高CysC组(CysC≥1.3 mg/L,178例)和对照组(CysC<1.3 mg/L,670例),比较两组患者PCI术后CI-AKI发生及随访1年主要心脏不良事件(MACE)发生率的差异,并进一步采用Cox回归模型分析PCI术后远期预后的预测因素。结果848例患者PCI术后发生CI-AKI的比例为9.4%。根据CysC水平,发现高CysC组PCI术后1年MACE发生率高于对照组15.7%比9.3%,χ²=6.524,(P=0.011)];Cox回归分析显示高CysC(≥1.3 mg/L)水平是PCI术后1年MACE发生的最强预测因素(HR=16.244,P<0.001)。结论基线高CysC水平(≥1.3 mg/L)是老年患者PCI术后CI-AKI的独立危险因素,也是老年患者PCI术后远期MACE发生的最重要预测因素。

Effects of serum cystatin C level on the occurrence and its long-term prognosis of contrast agent-induced acute kidney injury after coronary intervention in elderly patients

Objective To investigate the effect of serum cystatin C level on the occurrence and its long-term prognosis of contrast agent-induced acute kidney injury(CI-AKI)after percutaneous coronary intervention(PCI)in elderly patients.Methods A total of 848 elderly patients(≥60 years)undergoing PCI in our department between Mar 2015 and Dec 2017 were enrolled in a prospective cohort.The CI-AKI was defined as the increase of serum creatinine≥44.2μmol/L within 48-72 h after using iodine contrast agent or more than 25%higher than base level within 48-72 h after PCI.A receiver operating characteristic curve was used to analyze the optimal cut-off value of Cystatin C for predicting CI-AKI after PCI.Patients were divided into 2 groups based on the optimal cut-off value of Cystatin C:the high Cystatin C group(Cystatin C≥1.3 mg/L,n=178)and the control group(Cystatin C<1.3 mg/L,n=670).The differences in the incidence of CI-AKI after PCI and major adverse cardiac events(MACE)at 1 year follow-up were compared between the two groups.The Cox regression model was further used to analyze the predictors of the long-term prognosis after PCI.Results Of 848 patients receiving PCI,the incidence of CI-AKI was 9.4%.The incidence of MACE at 1 year after PCI was higher in the high Cystatin C group than in the control group(15.7%vs.9.3%,χ2=6.524,P=0.011).Cox regression analysis confirmed that the high baseline level of Cystatin C was the most independent predictive factor for MACE at 1 year of follow-up(HR=16.244,P<0.001).Conclusions The high baseline level of Cystatin C(≥1.3 mg/L)is an independent risk factor for CI-AKI and is also the most important predictor for the occurrence of long-term MACE in elderly patients undergoing PCI.