Abstract： Background:Coronary computed tomographic angiography (CCTA) has been widely used in patients who are at intermediate risk for having stable coronary artery disease (SCAD),and 2013 European Society of Cardiology Guidelines on the Management of SCAD (2013G) recommended the appropriate application of CCTA.However,2013G has not been subjected to systematic analyses for subsequent impact on clinical practice.Methods:A total of 5320 patients suspected with SCAD were enrolled and scheduled for CCTA from March 2013 to September 2014.For each patient,pretest probability of SCAD was calculated according to updated Diamond-Forrester model (UDFM).Appropriate CCTA or appropriate stress test was determined as described in the 2013G.A generalized estimating equation model was used to determine the trends in the half-monthly rate of appropriate CCTA.Results:Overall,only 61.37％ of patients received appropriate CCTA,and there was insignificant change over time (P =0.8701).The application of CCTA in patients who should have had a stress test accounted for most of the inappropriate CCTA before (22.29％) or after (19.98％) the publication of the 2013G.In all patients or any subgroup,no significant change in the adjusted half-monthly rate of appropriate CCTA was found after the publication of the 2013G (odds ratio,1.002;95％ confidence interval,0.982-1.021;P =0.8678).Conclusions:These findings suggest that the 2013G have not,to date,been fully incorporated into clinical practice,and the clinical utilization of CCTA remains unreasonable to some extent.