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; 1-10; 11-100; 101-400; 401-1,000; >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 (76-77%) in classes with low CACS (1-10/11-100). 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.

Additional Metadata
Keywords CT coronary angiography, Conventional coronary angiography, Coronary artery calcium score, Diagnostic accuracy, Registry
Persistent URL dx.doi.org/10.1007/s11547-011-0662-0, hdl.handle.net/1765/33270
Maffei, E, Martini, C, Tedeschi, C, Spagnolo, P, Zuccarelli, A, Arcadi, T, … Cademartiri, F. (2011). 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. La Radiologia Medica, 116(7), 1000–1013. doi:10.1007/s11547-011-0662-0