双源CT前瞻性心电门控对较高心率患者冠状动脉成像的准确性研究

目的 评价双源CT(DSCT)前瞻性心电门控对较高心率(HR)冠状动脉成像图像质量及诊断冠心病(CAD)的准确性.方法 回顾性分析103例连续患者的有创冠状动脉造影(ICA)和DSCT前瞻性心电门控冠状动脉成像资料,根据患者DSCT扫描时的心率分成3组,低心率组<60次/min(bpm)]34例、中等心率组(60-70 bpm)36例和较高心率组(HR>70 bpm)33例.分析各组DSCT冠状动脉成像的图像质量(1～4分),以ICA为金标准,评价不同心率下DSCT前瞻性心电门控诊断CAD(狭窄≥50%)的敏感度和特异度,差异性用x2检验.结果 共1648个冠状动脉节段中的1580个(95.9%)能够满足诊断的图像质量要求,低、中、较高心率3组图像质量评分分别为(3.1±0.3)、(3.1±0.3)和(3.0±0.4)分(x2=2.80,P>0.05).各组诊断CAD的敏感度、特异度分别为82.8%(77/93)和98.4%(428/435),88.3%(91/103)和98.7%(442/448),80.3%(57/71)和98.6%(424/430)(x2值分别为0.69和0.13,P值均>0.05).总体ROC曲线下面积为0.94(95%可信区间为0.92～0.96),平均有效辐射剂量为(3.60±1.60)mSv.结论 DSCT前瞻性心电门控能够用于较高心率患者的冠状动脉成像,与较低心率组在诊断CAD时差异无统计学意义.

Abstract：

Objective To evaluate the diagnostic accuracy of dual-source CT(DSCT)prospective ECG-triggering coronary angiography in patients with different heart rate(HR).Methods One hundred and three patients with suspected coronary artery disease underwent DSCT prospective ECG-triggered coronary angiography and invasive coronary angiography(ICA).The patients were grouped by HR during CT scans:low HR(<60 bpm,n=34),medium HR(60-70 bpm,n=36)and high HR(>70 bpm,n=33).Image quality was scored using a 4-point scale.The sensitivity and specificity of DSCT in detecting≥50%stenosis were compared among subgroups where ICA was the gold standard.The differences were compared by using the X2 test of contingency on a per-segment and per-vessel basis.Results Image quality of 1580 coronary artery segments in 1648(95.9%)met the requirements for diagnosis.The image quality scores were(3.1±0.3),(3.1±0.3)and(3.0±0.4)point for subgroups(X2=2.80,P>0.05).Sensitivity and specificity were 82.8%(77/93)and 98.4%(428/435),88.3%(91/103)and 98.7%(442/448),and 80.3%(57/71)and 98.6%(424/430)for different subgroups(X2 were 0.69 and 0.13,all P>0.05).The overall area under the receiver operating characteristic(ROC)curve was 0.94(95%CI=0.92-0.96).The average effective radiation dose was(3.60±1.60)mSv.Conclusion DSCT coronary angiography with prospective ECG-triggering could be used for patients with high HR.And the diagnostic accuracy was not statistical significant between the patients with low HR and patients with medium to high HR.

Diagnostic accuracy of dual-source CT coronary angiography with prospective electrocardiography triggering in patients with higher heart rate

Objective To evaluate the diagnostic accuracy of dual-source CT(DSCT)prospective ECG-triggering coronary angiography in patients with different heart rate(HR).Methods One hundred and three patients with suspected coronary artery disease underwent DSCT prospective ECG-triggered coronary angiography and invasive coronary angiography(ICA).The patients were grouped by HR during CT scans:low HR(<60 bpm,n=34),medium HR(60-70 bpm,n=36)and high HR(>70 bpm,n=33).Image quality was scored using a 4-point scale.The sensitivity and specificity of DSCT in detecting≥50%stenosis were compared among subgroups where ICA was the gold standard.The differences were compared by using the X2 test of contingency on a per-segment and per-vessel basis.Results Image quality of 1580 coronary artery segments in 1648(95.9%)met the requirements for diagnosis.The image quality scores were(3.1±0.3),(3.1±0.3)and(3.0±0.4)point for subgroups(X2=2.80,P>0.05).Sensitivity and specificity were 82.8%(77/93)and 98.4%(428/435),88.3%(91/103)and 98.7%(442/448),and 80.3%(57/71)and 98.6%(424/430)for different subgroups(X2 were 0.69 and 0.13,all P>0.05).The overall area under the receiver operating characteristic(ROC)curve was 0.94(95%CI=0.92-0.96).The average effective radiation dose was(3.60±1.60)mSv.Conclusion DSCT coronary angiography with prospective ECG-triggering could be used for patients with high HR.And the diagnostic accuracy was not statistical significant between the patients with low HR and patients with medium to high HR.