2.5. Modified Gensini score calculation

According to the results of quantitative coronary angiography, we utilized the modified Gensini Score to assess the severity of coronary artery. The modified Gensini Score assigns different scores based on the degree of stenosis of the coronary artery (1 for 0%–25% stenosis, 2 for 26%–50%, 4 for 51%–75%, 8 for 76%–90%, 16 for 91%–99%, and 32 for 100%). If the lesion was ≥99%, the score was adjusted based on the presence of collateral supplying arteries and the degree of narrowing of the supplying arteries. Additionally, different multiplier factors were assigned based on the specific positions of the coronary artery tree where the lesions were located (5 for the left main coronary artery, 2.5 for the proximal left anterior descending branch and the proximal left circumflex branch, 1.5 for the midsegment of left anterior descending artery, 0.5 for the second diagonal branch and the posterolateral branch, and 1 for other branches) (12, 13). The modified Gensini score for each enrolled patient was the total of all lesion severity scores. The higher the score is, the more severe the coronary is.