缺血修饰白蛋白在急性冠状动脉综合征早期诊断中的价值

目的 探讨缺血修饰白蛋白(IMA)对急性冠状动脉综合征(ACS)的早期诊断价值.方法 103例疑似ACS患者[非心肌缺血性胸痛(NICP)45例(NICP组),ACS 58例(ACS组)]在胸痛发作5 h内取血测定IMA、肌钙蛋白I(cTnI)、肌酸激酶同工酶MB(CK-MB)并在入院后即刻描记12导联心电图(ECG),同时选择30例健康对照(对照组)进行检测,经ROC曲线分析获得区分NICP与ACS最佳,临界值点(Cut-off值).IMA、cTnI、CK-MB及ECG结果分别与最终诊断结果(NICP,ACS)进行综合分析,评价其诊断ACS的敏感性.结果 ACS组与NICP组IMA值分别是(89.66±25.82)、(46.79±17.20)U/ml,2组间比较IMA值差异有统计学意义(P＜0.05);ROC曲线下面积0.935,最佳临界值为71.6 U/ml,此时IMA检测的敏感性、特异性、阳性预测值和阴性预测值分别为90.6%、71.4%、82.8%和83.3%.而同步测定cTnI、CK-MB、ECG诊断ACS的阳性率分别为29.3%、27.6%、48.3%.结论 IMA是诊断急性心肌缺血早期灵敏指标,可明显提高ACS早期诊断的敏感性.

Value of ischemia modified albumin detection method in the early diagnosis of acute coronary syndrome.

Objective To discuss the value of ischemia modified albumin (IMA) in the early diagnosis of acute coronary syndrome (ACS). Methods The IMA,cTnI, CK-MB and ECG were detected in 103 patients with suspected ACS (45 cases of NICP and 58 cases of ACS) within 5 hours of acute chest pain onset respectively. 30 healthy subjects were served as normal controls. Receiver operating characteristic (ROC) analysis was used to determine the optimal cutoff of this assay for identifying individuals with ACS from non-ischemic individuals (nonischemic chest pain, NICP). Results of IMA,cTnI,CK-MB and ECG were correlated with the final diagnosis and their diagnostic sensitivities for ACS were evaluated. Results The results suggested that acute phase IMA values between those with ACS and NICP were (89.66 ± 25.82) U/ml, (46.79 ± 17.20) U/ml respectively and showed significant difference. Area under the curve (AUC) of the ROC was 0.935. As the Cut-off point was 71.6 U/ml, the sensitivity, specificity, PPV and NPV of IMA were 90.6%, 71.4% , 82.8% and 83.3%, respectively. The simutanious positive rate of IMA for ischemia origin were 29.3% of cTnI,27.6% of CK-MB and 48.3% of ECG(P＜ 0.01). Conclusions Plasma IMA assessment is valuable for early diagnosis of acute coronary ischemia, and will improve the early diagnostic sensitivity of ACS significantly.