General data
Organic heart disease, coronary arteriovenous fistula
A total of 4,866 patients who underwent CCTA at Cangzhou Central Hospital from January 1, 2021, to September 1, 2021, were selected, and from that group, 1,202 patients were reported to have an RI through the picture archiving and communication system report. After excluding patients according to the exclusion criteria, 100 patients were randomly selected by the computer random number method. The average age of the selected patients was 61.90 ± 10.43 years. In terms of gender, 57 were males and 43 were females. Another 500 patients were randomly selected from 3,664 non-RI cases during the same time period by the computer random number method. After excluding patients according to the exclusion criteria, 100 patients were randomly selected as the no-RI group (the sample size thus met the statistical requirements). The average age of the selected patients was 58.11 ± 11.53 years. In terms of gender, 44 were males and 56 were females. Exclusion criteria: (1) Metal implants (stents, pacemakers, etc.); (2) A history of coronary artery bypass surgery; (3) Organic heart disease (including heart valve implantation); (4) Coronary artery variation (such as anomalous origin of the coronary artery and coronary arteriovenous fistula); (5) Poor CCTA image quality (images missing, etc.); (6) Branches: ≥1 of the LAD, the LCX, and the RI were mural coronary arteries; (7) Non-dominant right coronary artery; (8) Non-single RI (Except for in the non-RI group); and (9) Incomplete clinical data.