心脏磁共振在低危急性冠状动脉综合征中的诊断价值

目的 探讨心脏磁共振(CMR)负荷心肌灌注显像在低危急性冠状动脉综合征(ACS)中的早期诊断价值.方法 前瞻性入选22例怀疑或确诊低危ACS患者,均行CMR与单光子发射计算机断层(SPECT)负荷心肌灌注显像及冠状动脉造影(CAG).以CAG作为参考标准,分析CMR诊断效能,并与SPECT结果作对比.结果 以患者为基础分析,CMR诊断ACS敏感性和特异性分别为93%,75%;SPECT相应值分别为79%,63%.CMR诊断效能为0.897, 略高于SPECT 0.723 (P=0.19).以血管为基础分析,CMR诊断ACS敏感性和特异性分别为89%,87%;SPECT相应值分别为68%, 83%.CMR诊断效能0.923, 高于SPECT 0.774 (P<0.05).在左前降支(LAD)供血区,CMR诊断效能明显高于SPECT(0.900,0.553,P=0.009 6).结论 CMR负荷心肌灌注显像能准确探测低危ACS患者心肌缺血,诊断效能好于SPECT负荷心肌灌注显像.

The clinical value of cardiac magnetic resonance in low risk patients with symptoms concerning for acute coronary syndrome

Objective To investigate the diagnostic performance of stress cardiac magnetic resonance(CMR) for evaluating low-risk patients with suspected acute coronary syndrome(ACS).Methods Twenty-two patients with low risk of suspected ACS were prospectively and consecutively enrolled in this study.Diagnostic performance of stress CMR was compared with single-photon emission computed tomography(SPECT) for diagnosis of myocardial ischemia with coronary angiography (CAG) as the reference method.Results On the patient-based level analysis,the diagnostic performance of CMR for detection of ACS was sensitivity 93% and specificity 75%.The corresponding value of SPECT was 79%,63%.The area under the ROC (AUC) of CMR was 0.897, which was slightly superior to that of SPECT at 0.723 (P=0.19).On the per-vessel assessment, the diagnostic value of CMR was sensitivity 89%,specificity 87%, while the corresponding value of SPECT was 68%,83%.The AUC of CMR was 0.923,which was significantly higher than that of SPECT at 0.774 (P<0.05).Furthermore, the AUC of CMR was significantly superior to that of SPECT with AUC being 0.900 and 0.553 in the left anterior descending (LAD) vessels (P=0.009 6).Conclusion Stress perfusion CMR has excellent diagnostic performance in low risk ACS patients.Compared with SPECT,stress perfusion CMR performed better in the low-risk ACS populations.