[Diagnostic accuracy of noninvasive coronary artery angiography using 64 multi-slice computed tomography on coronary atherosclerosis].

OBJECTIVE

To evaluate the diagnostic accuracy of 64 multislice computed tomography (MSCT) coronary angiography on the coronary atherosclerosis.

METHODS

Sixty one (52 male, 9 female, averaged 58 +/- 11 yrs ) patients underwent conventional coronary angiography and 64-MSCT angiography for suspected coronary artery disease within 5 to 20 days. Coronary artery image quality was scored from 1 to 4 (image quality score, 1: poor; 2: good -; 3: good +, and 4: excellent) on RCA, LM, LAD and LCX, respectively. The coronary artery stenosis were divided into two groups by over than 50% and less than 50% and diagnostic accuracy was analyzed. The coronary plaques were divided as calcified and noncalcified plaque according to its density. The stenosis result from calcified and noncalcified plaque were analyzed.

RESULTS

Mean score of image quality on RCA, LM, LAD and LCX was 3.57 +/- 0.18 with heart beats 50 - 104 bpm (mean 70 +/- 11 bpm). Compared with CAG, the sensitivity and specificity of 64-MSCT in evaluating stenosis are 94.45% and 96.15%, the false positive and false negative value are 3.85% and 4.55%. The sensitivity and specificity were 85.71% in evaluating stenosis result from noncalcified plaque and they were 83.33% and 31.57% result from calcified plaque.

CONCLUSION

64-MSCT is an accurate and feasible method in evaluating coronary artery stenosis compared to conventional coronary angiography. However the specificity was poor in evaluating calcified plaque.