摘要 : With interest we read the recently published letter by Andrea K.Y. Lee et aL, entitled "Normalcy rate of computed tomographic coronary angiography" [1]. The authors assessed the normalcy rate (NR) of computed tomographic coronary ... 展开 With interest we read the recently published letter by Andrea K.Y. Lee et aL, entitled "Normalcy rate of computed tomographic coronary angiography" [1]. The authors assessed the normalcy rate (NR) of computed tomographic coronary angiography (CTCA) in a clinical population of patients with a very low pretest probability (<=4%) for coronary artery disease (CAD). A total of 601 patients (mean pretest probability 2.7%) were analyzed for the presence and severity of CAD. Using thresholds of >= 50% and >= 70% coronary artery diameter stenoses, the NR of CTCA were 94% and 97%, respectively. We agree with the authors that these percentages are as expected, since statistics dictate there will be some patients with obstructive CAD despite of their very low pretest probability. 收起