Stress-ECG vs. CT coronary angiography for the diagnosis of coronary artery disease: a “real-world” experience

Purpose

This study aimed to evaluate the diagnostic accuracy of stress electrocardiogram (ECG) and computed tomography coronary angiography (CTCA) for the detection of significant coronary artery stenosis (≥50%) in the real world using conventional CA as the reference standard.

Materials and methods

A total of 236 consecutive patients (159 men, 77 women; mean age 62.8±10.2 years) at moderate risk and with suspected coronary artery disease (CAD) were enrolled in the study and underwent stress ECG, CTCA and CA. The CTCA scan was performed after i.v. administration of a 100-ml bolus of iodinated contrast material. The stress ECG and CTCA reports were used to evaluate diagnostic accuracy compared with CA in the detection of significant stenosis ≥50%.

Results

We excluded 16 patients from the analysis because of the nondiagnostic quality of stress ECG and/or CTCA. The prevalence of disease demonstrated at CA was 62% (n=220), 51% in the population with comparable stress ECG and CTCA (n=147) and 84% in the population with equivocal stress ECG (n=73). Stress ECG was classified as equivocal in 73 cases (33.2%), positive in 69 (31.4%) and negative in 78 (35.5%). In the per-patient analysis, the diagnostic accuracy of stress ECG was sensitivity 47%, specificity 53%, positive predictive value (PPV) 51% and negative predictive value (NPV) 49%. On stress ECG, 40 (27.2%) patients were misclassified as negative, and 34 (23.1%) patients with nonsignificant stenosis were overestimated as positive. The diagnostic accuracy of CTCA was sensitivity 96%, specificity 65%, PPV 74% and NPV 94%. CTCA incorrectly classified three (2%) as negative and 25 (17%) as positive. The difference in diagnostic accuracy between stress ECG and CTCA was significant (p<0.01).

Conclusions

CTCA in the real world has significantly higher diagnostic accuracy compared with stress ECG and could be used as a first-line study in patients at moderate risk.     

Diagnostic accuracy of 64-slice computed tomography coronary angiography in a large population of patients without revascularisation: registry data on the comparison between male and female population

Purpose

This study was undertaken to evaluate the diagnostic accuracy of computed tomography coronary angiography (CTCA) for detecting significant coronary artery stenosis (??50% lumen reduction) compared with conventional coronary angiography (CAG) in a male and female population.

Material and methods

A total of 1,372 patients (882 men, 490 women; mean age 59.3 ± 11.9 years) in sinus rhythm imaged with CTCA (64-slice technology) and CAG were enrolled. Diagnostic accuracy and likelihood ratios (LR+ and LR?) of CTCA were assessed against CAG for the male and female populations.

Results

The prevalence of obstructive disease was 53% (men 58%; women 43%). CAG demonstrated the absence of significant coronary artery disease (CAD) in 47% (men 42%; women 56%), single-vessel disease in 25% (men 36%; women 22%) and multivessel disease in 29% (men 32%; women 23%) of patients. In the per-patient analysis, sensitivity, specificity and positive (PPV) and negative (NPV) predictive values of CTCA were 99% (men 98%; women 100%), 92% (men 92%; women 92%), 94% (men 95%; women 90%) and 99% (men 98%; women 100%), respectively. The per-patient likelihood ratios (LR) in the total population (LR+=12.4 and LR?=0.011), the male (LR+=12.9 and LR?=0.016) and female (LR =11.9 and LR?=0) populations were very good. We observed no significant differences in diagnostic accuracy between male and female populations.

Conclusions

CTCA is a reliable diagnostic modality with high sensitivity and NPV in the female population.     

Diagnostic accuracy of second-generation dual-source computed tomography coronary angiography with iterative reconstructions: a real-world experience

Purpose

The authors evaluated the diagnostic accuracy of second-generation dual-source (DSCT) computed tomography coronary angiography (CTCA) with iterative reconstructions for detecting obstructive coronary artery disease (CAD).

Materials and methods

Between June 2010 and February 2011, we enrolled 160 patients (85 men; mean age 61.2±11.6 years) with suspected CAD. All patients underwent CTCA and conventional coronary angiography (CCA). For the CTCA scan (Definition Flash, Siemens), we use prospective tube current modulation and 70-100 ml of iodinated contrast material (Iomeprol 400 mgI/ ml, Bracco). Data sets were reconstructed with iterative reconstruction algorithm (IRIS, Siemens). CTCA and CCA reports were used to evaluate accuracy using the threshold for significant stenosis at ??50% and ??70%, respectively.

Results

No patient was excluded from the analysis. Heart rate was 64.3±11.9 bpm and radiation dose was 7.2±2.1 mSv. Disease prevalence was 30% (48/160). Sensitivity, specificity and positive and negative predictive values of CTCA in detecting significant stenosis were 90.1%, 93.3%, 53.2% and 99.1% (per segment), 97.5%, 91.2%, 61.4% and 99.6% (per vessel) and 100%, 83%, 71.6% and 100% (per patient), respectively. Positive and negative likelihood ratios at the per-patient level were 5.89 and 0.0, respectively.

Conclusions

CTCA with second-generation DSCT in the real clinical world shows a diagnostic performance comparable with previously reported validation studies. The excellent negative predictive value and likelihood ratio make CTCA a first-line noninvasive method for diagnosing obstructive CAD.     

64层螺旋CT冠状动脉成像临床应用评价

目的:评价64层螺旋CT冠状动脉成像(64SCTCA)的图像质量和在诊断冠状动脉疾病的临床价值。方法:搜集35例患者64SCTCA的完整资料,并以近期实施的选择性X线冠状动脉成像(SCA)结果为金标准进行对比,对64SCTCA显示的冠状动脉主支及主要分支情况进行分级评估。结果:35例病例可用于评估的冠状动脉共计368支,成功率达95.6%。其中SCA共显示74个节段冠脉有中、重度狭窄(≥50%)。MSCTCA诊断中重度狭窄的敏感性为86.5%,特异性为97.3%,阳性预测值88.9%,阴性预测值96.6%。经配对χ2检验,P>0.05,证明两种检查方法在发现冠状动脉病变方面差异无统计学意义。结论:64层螺旋CT冠状动脉成像是一种无创、快速的成像方法,对诊断冠状动脉≥50%狭窄有较高的敏感性和特异性,适合用于临床怀疑冠心病的患者SCA前的筛选检查。     

Diagnostic accuracy of 64-slice computed tomography coronary angiography in a large population of patients without revascularisation: registry data on the impact of calcium score

Purpose

This study evaluated the diagnostic accuracy of computed tomography coronary angiography (CTCA) for detecting significant coronary artery stenosis (??50% lumen reduction) at different coronary calcium score (CACS) values with conventional coronary angiography (CAG) as the reference standard.

Material and methods

A total of 1,500 patients (928 men, mean age 58.2??12.5 years) in sinus rhythm who underwent CTCA (64-slice technology) and CAG were enrolled. Diagnostic accuracy and likelihood ratios (LR) of CTCA were evaluated against CAG for the total population and in different CACS classes (0; 1?C10; 11?C100; 101?C400; 401?C1,000; >1,000).

Results

The prevalence of obstructive disease was 51% (23.5% single vessel; 27.5% multivessel; progressive increase from 17.9% to 94% through the CACS classes). In the per-patient analysis, sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of CTCA were 99%, 92%, 94% and 99%, respectively. Per-patient analysis showed a worse PPV of CTCA (76?C77%) in classes with low CACS (1?C10/11?C100). Per-patient LR were higher in classes with extreme CACS values (0 = LR+ 18.3 and LR? = 0.0; c1,000 = LR+ 17.0 and LR? = 0.0) with values always >7 for LR+ and <0.033 for LR? for all CACS classes.

Conclusions

CTCA is a reliable diagnostic modality, with high sensitivity and NPV regardless of CACS.     

64层螺旋CT冠状动脉造影对冠状动脉狭窄的诊断价值

目的：评价64层螺旋CT冠状动脉造影（64-slice CTCA）诊断冠状动脉狭窄的临床应用价值。方法：对120例临床怀疑冠状动脉疾病及支架置入术、冠脉搭桥术后的患者进行64层螺旋CT冠状动脉成像。采用回顾性心电门控扫描,并采用曲面重建、多平面重组,容积再现及最大密度投影技术显示冠状动脉主干及分支,其中30例患者近期行传统冠状动脉造影（CCA）。结果：120例患者可评价冠脉节段1377个,可满足诊断的冠脉节段1341个,占97．39％。30例患者近期行CCA检查,MSCTCA诊断冠脉狭窄节段103个与CCA相符,占88．03％,显示轻、中、重度狭窄及血管闭塞与CCA符合率分别为77．8％、93．3％、91．6％、77．8％,得出64SCTCA诊断冠脉狭窄敏感性97．52％,特异性96．02％,阳性预测值95．16％,阴性预测值96．01％。结论：64层螺旋CT冠状动脉造影在诊断冠状动脉疾病方面有很高的诊断价值,可以成为筛查、排除冠状动脉病变及支架、搭桥术后随访的常规检查方法。     

Diagnostic accuracy of 64-slice computed tomography coronary angiography in a large population of patients without revascularisation: registry data in NSTEMI acute coronary syndrome and influence of gender and risk factors

Purpose

This study sought to evaluate the diagnostic accuracy of computed tomography coronary angiography (CTCA) for detecting significant coronary artery stenosis (??50% lumen reduction) compared with conventional coronary angiography (CAG) in non-ST-elevation myocardial infarction-acute coronary syndrome (NSTEMI-ACS) and in subgroups selected by gender and number of risk factors (RF).

Materials and methods

We selected from a population of 1,500 patients in a multicentre registry with NSTEMI-ACS who had undergone CTCA and CAG, (n=237; 187 men, mean age 63±10 years). Diagnostic accuracy and likelihood ratios (LR) of CTCA were assessed against CAG in the total population and subgroups (men, women: 0 RF = absence of RF, 1?C2 RF = presence of one or two RF, >2 RF = presence of more than two RF).

Results

The prevalence of obstructive disease was 53%. In the per-patient analysis, sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of CTCA were 100% (men 100%; women 100%; 0 RF 100%; 1?C2 RF 100%; >2 RF 100%), 95% (men 98%; women 50%; 0 RF NA% (NA, not assessable); 1?C2 RF 96%; >2 RF 96%), 95% (men 98%; women 91%; 0 RF 91%; 1?C2 RF 96%; >2 RF 96%), 100% (men 100%; women 100%; 0 RF NV%; 1?C2 RF 100%; >2 RF 100%), respectively. The per-segment analysis showed a reduction in PPV (ranging between 56% and 67%). The per-patient LR+ ranged between 18 and 27, whereas LR-were always 0. We observed no significant differences in diagnostic accuracy between subgroups.

Conclusions

CTCA is a reliable diagnostic modality with high sensitivity and NPV in NSTEMI-ACS patients who are not candidates for early revascularisation, regardless of gender and number of risk factors.     

Coronary artery disease: Which degree of coronary artery stenosis is indicative of ischemia?

Purpose

To prospectively determine the best cut-off value of stenosis degree for low-dose computed tomography coronary angiography (CTCA) to predict the hemodynamic significance of coronary artery stenoses compared to catheter angiography (CA) using a cardiac magnetic resonance based approach as standard of reference.

Materials and methods

Fifty-two patients (mean age, 64 ± 10 years) scheduled for CA underwent cardiac magnetic resonance (CMR) at 1.5-T and dual-source CTCA using prospective ECG-triggering the same day. Diagnostic performance of CTCA and CA to detect myocardial ischemia was evaluated with CMR as the standard of reference. The diagnostic performance and best cut-off values to predict the hemodynamic significance of coronary were determined from receiver operating characteristics analysis (ROC).

Results

CA revealed >50% stenoses in 131/832 segments (15.7%) in 78/156 (50.0%) coronary arteries in 32/52 (62%) patients. CTCA revealed >50% stenoses in 148/807 (18.3%) segments, corresponding to 83/156 (53.2%) coronary arteries in 34/52 (65.4%) patients. CMR revealed ischemia in 118/832 (14.2%) myocardial segments corresponding to the territories of 60/156 (38.5%) coronary arteries in 29/52 (56%) patients. ROC analysis showed equal diagnostic performance for low-dose CTCA and CA with areas under the curve (AUC) of 0.82 and 0.83 (P = 0.64). The optimal cut-off value was determined at stenosis of >60% for the prediction of hemodynamically significant coronary stenosis by CTCA. Using this cut-off value, sensitivity, specificity, NPV and PPV to predict hemodynamic significance by CTCA were 100%, 83%, 100%, and 88% on a per-patient basis and 88%, 73%, 83% and 81% on a per-artery analysis, respectively.

Conclusion

By considering coronary stenosis >60%, diagnostic performance for predicting the hemodynamic significance of coronary stenosis by CTCA is optimal and equals that of CA.     

Diagnostic accuracy of 64-slice computed tomography coronary angiography in a large population of patients without revascularisation: registry data and review of multicentre trials

Purpose

This study was undertaken to evaluate the diagnostic accuracy of computed tomography coronary angiography (CT-CA) for the detection of significant coronary artery stenosis (≥50% lumen reduction) compared with conventional coronary angiography (CCA) in a registry and to review major multicentre trials.

Materials and methods

A total of 1,372 patients (882 men, 490 women; mean age 59.3±11.9 years) in sinus rhythm were studied with CT-CA (64-slice technology) and CCA. The diagnostic accuracy of CT-CA was evaluated against quantitative CCA as a reference standard for coronary artery stenosis. Positive and negative likelihood ratios and inter- and intraobserver agreement were calculated.

Results

The prevalence of disease was 53%. CCA demonstrated the absence of significant coronary artery disease in 46.6% (639/1372), single-vessel disease in 24.7% (337/1372) and multivessel disease in 28.9% (396/1372) of patients. In per-patient analysis sensitivity, specificity and positive and negative predictive value of CT-CA were 99% [confidence interval (CI) 97–99], 92% (CI 89–94), 94% (CI 91–95) and 99% (CI 97–99), respectively. Per-patient and per-segment likelihood ratios (LR+=12.4 and LR?=0.011; LR+=18.3 and LR?=0.064, respectively), were good. Inter- and intraobserver variability was 0.78 and 0.85, respectively.

Conclusions

CT-CA is a reliable diagnostic modality both in terms of sensitivity and negative predictive value. Differences in trial results are also due to the different parameters used for patient inclusion.     

64MDCT冠状动脉成像在冠心病诊断中的应用价值

目的探讨64层螺旋CT冠状动脉成像在冠心病诊断中的应用价值。方法随机选择我院2010年10月～2011年12月46例由于胸痛、胸闷就诊的患者,分别给予64层螺旋CT冠状动脉成像与选择性冠状动脉造影,以选择性冠状动脉造影检查的结果为“金标准”,分析64层螺旋CT冠状动脉成像在冠心病诊断中的敏感性、特异性及准确率。结果MDCTCA共检查节段586个,直径在1．5mm以上有504个,检出狭窄程度≥50％的28例,漏诊1例,误诊2例。与冠状动脉造影检查结果相比,64层螺旋CT冠状动脉成像检查的敏感性为96．3％（26／27例）,特异性为89．5％（17／19例）,准确性为93．5％（43／46例）,阳性预测值为92．9％（26／28）,阴性预测值为94．4％（17／18）,差异无统计学意义（P〉0．05）。结论64层螺旋CTCA具有无创、安全、经济且操作简便的优点,对冠状动脉病变诊断具有良好的敏感度和特异性,是一种可广泛应用于冠心病的筛选和诊断的检查方法。     

钙化积分、CTCA以及两者联合对冠状动脉狭窄的诊断价值

目的:探讨冠状动脉钙化积分(CS)、CT冠状动脉成像(CTCA)以及两者联合对诊断冠状动脉狭窄病变的价值.方法:189例患者均行冠状动脉钙化积分扫描、CT冠状动脉成像以及传统冠状动脉造影(CAG)检查.计算CS、CT-CA以及两者联合诊断冠状动脉病变的符合率,并记录有效X线剂量.结果:189例患者中临床诊断为冠心病156例(82.5％),经冠状动脉造影检测出至少有1支冠状动脉狭窄≥50％.采用钙化积分250分作为诊断阈值,检测冠状动脉狭窄≥50％的敏感度和特异度分别为42.9％(67/156)和96.9％(32/33).CTCA检测冠状动脉狭窄≥50％的敏感度和特异度分别为98.1％(153/156)和72.7％(24/33).CS和CTCA联合时,检测冠状动脉狭窄≥50％的敏感度和特异度分别为96.2％(150/156)和87.9％(29/33).结论:钙化积分对诊断冠状动脉狭窄有着很高的特异度;CTCA对诊断冠状动脉狭窄有着很高的敏感度;CTCA联合钙化积分扫描可提高冠状动脉狭窄的诊断符合率.     

平均心率、心率变异性和钙化负荷对双源CT冠状动脉成像诊断准确性的影响

目的 与常规冠状动脉造影(CAG)对照,评价双源CT冠状动脉血管成像(CTCA)诊断冠状动脉狭窄性病变的准确性以及平均心率、心率变异性和钙化负荷对CTCA诊断准确性的影响.资料与方法 2006年12月至2008年9月,113例患者同时进行了CTCA与CAG.以CAG为参照,评价CTCA诊断≥50%和>75%冠状动脉狭窄性病变的准确性.按心率、心率变异性和钙化积分将患者分组,评价不同亚组CTCA的诊断准确性,对敏感性和特异性数据进行χ~2检验.结果 以患者为分析单位,CTCA诊断≥50%和>75%冠状动脉狭窄性病变的敏感性和特异性分别为94%、93.3%;88.5%、96.2%;以血管为分析单位,CTCA诊断≥50%和>75%冠状动脉狭窄性病变的敏感性和特异性分别为90.0%、98.0%;84.8%、98.5%;而以节段为分析单位,CTCA诊断≥50%和>75%冠状动脉狭窄性病变的敏感性和特异性分别为89.9%、99.5%;83.0%、99.7%.平均心率对CTCA诊断冠状动脉狭窄无明显影响,而心率变异性和钙化积分对CTCA诊断冠状动脉狭窄有影响.结论 无论是以患者、血管还是节段为分析单位,CTCA在诊断冠状动脉狭窄方面均有较高的敏感性和特异性,平均心率对CTCA诊断冠状动脉狭窄的准确性无明显影响,而心率变异性和钙化积分对CTCA诊断冠状动脉狭窄的准确性有影响.     

Diagnostic accuracy of MDCT coronary angiography in patients referred for heart valve surgery

Purpose

The aim of our study was to evaluate the role of multidetector-row computed tomography (MDCT) in patients referred for heart valve surgery. We studied the diagnostic performance of CT coronary angiography (CTCA) compared with conventional coronary angiography (CCA) before valve surgery.

Materials and methods

During a 13-month period, 55 consecutive patients under evaluation for aortic (40/55) or mitral valve (15/55) disease before potential valve replacement underwent CTCA using a 64-detector-row scanner within 2 months of CCA for comparative purposes. All 17 major coronary artery segments were evaluated by one observer and compared with the reference standard. Patient-based, vessel-based and segment-based analyses of the data were performed.

Results

Prevalence of significant coronary artery disease, defined as having at least one stenosis ≥50% per patient, was 36%. On a patient-based analysis, sensitivity, specificity and positive and negative predictive values were 100%, 91%, 83% and 100%, respectively.

Conclusions

The diagnostic accuracy of 64-row CTCA for ruling out the presence of significant coronary stenoses in patients undergoing valve surgery is excellent and allows CTCA to be used as a gatekeeper for invasive CCA in these patients. MDCT is a necessary preoperative examination that provides useful information for identifying potential operative complications of surgical procedures.     

64层螺旋CT CA对冠状动脉狭窄的误诊原因（附76例分析）

目的分析64层螺旋CTCA评价冠状动脉狭窄的误诊原因,以期提高其诊断的准确性。方法收集76例疑诊冠心病患者64层螺旋CT冠状动脉成像（64SCTCA）的完整资料,并与常规冠状动脉造影（CCA）结果为金标准对比,分析误诊原因。结果76例64-SCTCA共评价852个冠状动脉节段,其中53个节段与CCA结果不一致,误诊率为6．2％。冠脉主干与分支的误诊率存在显著差异（P〈0．05）;左前降支中段、回旋支远段和右冠中段的误诊率显著高于其他节段（P〈0．05）。血管闭塞、钙化和呼吸伪影是导致误诊最常见的原因。结论了解64-SCTCA对冠脉狭窄误诊的原因,可以针对性地完善检查前准备和提高对狭窄的认识能力,并最终提高放射医师的诊断能力。     

Diagnostic accuracy of 64-slice computed tomography coronary angiography in patients with low-to-intermediate risk

PURPOSE: Our aim was to evaluate the diagnostic accuracy of 64-slice computed tomography coronary angiography (MSCT-CA) for detecting significant stenosis (>or=50% lumen reduction) in a population of patients at low to intermediate risk. MATERIALS AND METHODS: We studied 72 patients (38 men, 34 women, mean age 53.9+/-8.0 years) with atypical or typical chest pain and stratified in the low-to intermediate risk category. MSCT-CA (Sensation 64 Cardiac, Siemens, Germany) was performed after IV administration of 100 ml of iodinated contrast material (Iomeprol 400 mgI/ml, Bracco, Italy). Two observers, blinded to the results of conventional coronary angiography (CAG), assessed the MSCT-CA scans in consensus. Diagnostic accuracy for detecting significant stenosis was calculated. RESULTS: CAG demonstrated the absence of significant disease in 70.1% of patients (51/72). No patient was excluded from MSCT-CA. There were 37 significant lesions on 1,098 available coronary segments. Sensitivity, specificity and positive and negative predictive value of MSCT-CA for detecting significant coronary artery on a per-segment basis were 100%, 98.6%, 71.2% and 100%, respectively. All patients with at least one significant lesion were correctly identified by MSCT-CA. MSCT-CA scored 15 false positives on a per-segment base, which affected only marginally the per-patient performance (only one false positive). CONCLUSIONS: We concluded that 64-slice CT-CA is a diagnostic modality with high sensitivity and negative predictive value in patients at low to intermediate risk.     

Low-dose CT coronary angiography for the prediction of myocardial ischaemia

The purpose of this study was to prospectively determine the accuracy of low-dose computed tomography coronary angiography (CTCA) for the diagnosis of functionally relevant coronary artery disease (CAD) using cardiac magnetic resonance (CMR) as a standard of reference. Forty-one consecutive patients (age 64?±?10 years) underwent k-space and time broad-use linear acquisition speed-up technique accelerated CMR (1.5 T) and dual-source CTCA using prospective electrocardiography gating within 1 day. CTCA lesions were analysed and diameter stenoses of more than 50% and more than 75% were compared with CMR findings taken as the reference standard for assessing the functional relevance of CAD. CMR revealed perfusion defects in 21/41 patients (51%). A total of 569 coronary segments were analysed with low-dose CTCA. The image quality of low-dose CTCA was diagnostic in 566/569 segments (99.5%) in 39/41 patients (95%). Low-dose CTCA revealed stenoses of more than 50% in 58/123 coronary arteries (47.2%) in 24/41 patients (59%) and more than 75% stenoses in 46/123 coronary arteries (37.4%) in 23/41 patients (56%). Using a greater than 50% diameter stenosis, low-dose CTCA yielded the following per artery sensitivity, specificity, positive and negative predictive values, and accuracy for the detection of perfusion defects: 89%, 79%, 72%, 92% and 83%, respectively. Low-dose CTCA is reliable for ruling out functionally relevant CAD, but is a poor predictor of myocardial ischaemia.     

64排螺旋CT冠脉成像在冠心病诊断中的应用

目的 评价64排螺旋CT冠状动脉(冠脉)成像(CTA)在冠心病诊断中的应用价值.方法 以选择性冠脉造影(SCA)结果为金标准,采用64排螺旋CT对68例疑诊冠心病患者的冠脉主干及主要分支272节段进行重建和分析,评价其诊断冠心病的灵敏度和特异度.结果 CTA能够清晰显示冠脉主干及其分支狭窄、钙化、开口起源异常及桥血管病变,CTA发现钙化病变52节段,SCA仅发现钙化病变35节段.CTA诊断冠脉病变的灵敏度96.33%,特异度98.16%,阳性预测值97.22%,阴性预测值97.56%.其中对左主干、左前降支病变及＞75%的病变灵敏度最高,分别达到100%和94.4%.结论 CTA对冠脉狭窄病变、桥血管、开口畸形、支架管腔均显影良好,对冠心病诊断有较高的准确性,对钙化病变诊断率优于冠脉造影,可以作为冠心病高危人群无创性筛选检查及冠脉支架术后随访手段.     

Coronary calcium score as gatekeeper for 64-slice computed tomography coronary angiography in patients with chest pain: per-segment and per-patient analysis

We sought to investigate the performance of 64-slice CT in symptomatic patients with different coronary calcium scores. Two hundred patients undergoing 64-slice CT coronary angiography for suspected coronary artery disease were enrolled into five groups based on Agatston calcium score using the Mayo Clinic risk stratification: group 1: score 0, group 2: score 1–10, group 3: score 11–100, group 4: score 101–400, and group 5: score > 401. Diagnostic accuracy for the detection of significant (≥50% lumen reduction) coronary artery stenosis was assessed on a per-segment and per-patient base using quantitative coronary angiography as the gold standard. For groups 1 through 5, sensitivity was 97, 96, 91, 90, 92%, and specificity was 99, 98, 96, 88, 90%, respectively, on a per-segment basis. On a per-patient basis, the best diagnostic performance was obtained in group 1 (sensitivity 100% and specificity 100%) and group 5 (sensitivity 95% and specificity 100%). Progressively higher coronary calcium levels affect diagnostic accuracy of CT coronary angiography, decreasing sensitivity and specificity on a per-segment base. On a per-patient base, the best results in terms of diagnostic accuracy were obtained in the populations with very low and very high cardiovascular risk. Authors have no financial conflict of interest. Neither this paper nor any of its content has not been submitted to other journals.     

64层螺旋CT冠状动脉成像与冠状动脉造影的对比研究

目的评价64层螺旋CT冠状动脉成像诊断冠状动脉狭窄的准确性。方法 50例患者先后进行64层螺旋CT冠状动脉成像和冠状动脉造影检查,以冠状动脉造影为诊断冠状动脉疾病的"金标准",比较CT冠状动脉成像的符合率,评价64层螺旋CT冠状动脉成像诊断冠心病的准确性。结果 64层螺旋CT冠状动脉成像评价冠状动脉狭窄程度大于或等于50%的敏感性为98.6%,诊断狭窄程度小于50%的敏感性为87.0%,诊断冠状动脉狭窄的特异性为92.5%,阴性预测值为97.7%。结论 64层螺旋CT冠脉成像诊断冠状动脉狭窄有很高的准确率。     

64层螺旋CT评价冠状动脉狭窄的敏感性和准确性研究

目的评价64层螺旋CT冠状动脉成像（64SCTCA）对探测冠状动脉狭窄的敏感性和准确性。方法搜集36例患者64SCTCA的完整资料,并以近期实施的冠状动脉成像（CAG）结果为金标准进行对比,对64层螺旋CT冠状动脉主干及分支进行分析评估。结果所有病例可用于评估的342支中,共显示病变166支,其中134支得到证实;32支64SCTCA诊断存在病变而CAG显示正常;10支CAG确诊的病变在64SCTCA未能显示。64SCTCA显示冠状动脉病变的敏感性为80.7%,特异性94.3%,准确性为87.7%,阳性预测值93.0%,阴性预测值83.8%。采用成组配对χ2检验,P=0.05,证明64SCTCA和CAG两种检查方法在确诊冠状动脉病变上差异没有统计学意义。在对不同程度病变的评估上,轻度狭窄的敏感性为85.7%,准确性为83.0%;中度狭窄的敏感性为96.9%,准确性为98.5%;重度狭窄的敏感性为91.4%,准确性为95.9%。结论 64SCTCA在评价不同程度的冠状动脉狭窄时,具有较高的敏感性和准确性,因而它适用于冠心病的前期筛查及诊断。