腺苷脱氨酶诊断结核性胸腔积液的性能验证

目的验证腺苷脱氨酶(ADA)诊断结核性胸腔积液的性能。方法连续收集结核性胸腔积液43例、非结核性胸腔积液163例,用酶动力学法检测胸腔积液中ADA浓度。以非结核性胸腔积液组为对照,用ROC曲线计算ADA诊断结核性胸腔积液的临界值,并与既往文献报道的ADA诊断的敏感性和特异性进行比较。结果结核性胸腔积液组ADA浓度(中位数52.5 U/L)高于对照组(中位数9.8和10.6 U/L)(P<0.05)。临界值为25.0 U/L时,诊断结核性胸腔积液的敏感性和特异性分别为88.0%和91.0%。分析17篇QUADAS评分≥10分的文献发现,ADA诊断结核性胸腔积液的临界值为(28.1±12.8)U/L(10.2~55.8 U/L),Meta分析合并的诊断敏感性为89.0%(95%CI:87%~91%),合并的特异性为89.0%(95%CI:88%~91%)。结论 ADA诊断结核性胸腔积液的敏感性和特异性可达85%以上,但不同文献报告的诊断临界值有所差异。

Diagnostic performance of adenosine deaminase for tuberculous pleural effusion.

Objective To verify the diagnostic value of adenosine deaminase(ADA) for tuberculous pleural effusion. Methods Forty-three cases with tuberculous pleural effusion and 163 cases with non-tuberculous pleural effusion were consecutively collected. The concentration of ADA in pleural effusion was determined by enzyme kinetics. The receiver operating characteristic(ROC) analysis curve was used to calculate the optimal cut-off value of ADA for diagnosing tuberculous pleural effusion based on the control groups with non-tuberculous pleural effusion. Meanwhile, the specificity and sensitivity of ADA level for diagnosis of tuberculous pleural effusion were compared with previous reports. Results The concentration of ADA in tuberculous pleural effusion(median 52.5 U/L) was significantly higher than that in non-tuberculous pleural effusion(median 9.8 and 10.6 U/L)(P<0.05). With a cut-off level for ADA of 25 U/L, the diagnostic sensitivity and specificity was 88.0% and 91.0%, respectively. A system review analyzed data from 17 studies with QUADAS score ≥10 points and revealed the cut-off value of ADA to be(28.1±12.8) U/L(range 10.2 to 55.8 U/L) with a sensitivity of 89%(95%CI: 87% to 91%) and a specificity of 89%(95%CI: 88% to 91%). Conclusion The specificity and sensitivity of ADA for diagnosis of tuberculous pleural effusions should be up to over 85%, while the cut-off value of ADA from different literature reports were diverse.