D-二聚体在急性主动脉夹层中的诊断价值

目的 探讨血浆D-二聚体水平在急性主动脉夹层(acute aortic dissection,AAD)早期诊断中的价值.方法 选取2006年1月至2009年3月因胸痛就诊于复旦大学中山医院患者共80例,其中40例经动脉三维CT血管成像(CTA)检查确诊为急性主动脉夹层病例作为ADD组,同期以类似症状就诊但最终排除急性主动脉夹层的40例为对照组,所有患者胸痛发生12 h内检测血浆 D-二聚体,比较ADD组与对照组血浆 D-二聚体水平,分析D-二聚体诊断急性主动脉夹层的敏感性、特异性、阳性预测值、阴性预测值,并绘制D-二聚体诊断急性主动脉夹层的受试者工作曲线(receiver operating char-acteristic curve,ROC曲线).所有数据用SPSS 11.5统计软件分析处理,计量资料采用均数±标准差(χ±s)表示,两组间均数比较采用Mann-Whitney检验,以P<0.05为差异具有统计学意义.结果 ADD组血浆在D-二聚体水平明显高于对照组(5.48±7.95)vs.(0.64±0.75),P<0.01];D-二聚体(>0.5 μg/mL)诊断急性主动脉夹层的敏感性、特异性、阳性预测值和阴性预测值分别为87.5%,62.5%,70%和83.3%,受试者工作曲线下面积为0.848±0.042,95%CI为0.766-0.930.结论 D-二聚体可作为急性主动脉夹层早期诊断有效的筛选指标.

Diagnostic value of plasma D-dimer in acute aortic dissection

Objective To investigate the early diagnostic value of plasma D-dimer level in acute aortic dissection (AAD) . Method A total of 80 patients with chest pain were enrolled from January 2006 to March 2009, and 40 patients of them were confirmed to be AAD with computerized tomographic angiography (CTA), and these patients were matched with 40 controls presenting suspected dissection, which were ruled out later. The D-dimer test was performed in all patients within 12 hours after onset of chest pain,and plasma D-dimer concentrations were compared between two groups. Sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of D-dimer used for diagnosing AAD were analyzed. The receiver operating characteristic (ROC) curve was also established. The statistical analysis of data was carried out by using Mann-Whitney test with SPSS 11.5 software. Results The plasma D-dimer oncentrations in AAD were significantly higher than those in controls (5.48±7.95) vs. (0.64±0.75), P <0.0l]. Receiver operating characteristic curve analysis showed that D-dimer ( > 0.5 μg/mL) was predictive in the diagnosis of AAD, and the area under ROC curve was 0.848 ± 0.042, (95% CI: 0.766-0.930) with 87.5% sensitivity, 62.5% specificity,70% PPV and 83.3% NPV. Conclu-sions D-dimer may be a valuable biomarker in early diagnosis of AAD.