Abstract: Objective  To explore the risk factors for left heart failure in patients with acute myocardial infarction and right coronary artery as culprit blood vessel. Methods  From January 2017 to January 2020,  550 patients with acute myocardial infarction and right coronary artery as culprit blood vessel  confirmed by coronary angiography were selected from the First Affiliated Hospital of Henan University of Chinese Medicine. According to whether there was heart failure,  they were divided into heart failure group (n=120) and non heart failure group (n=430). The basic information,  laboratory tests,  medical history,  coronary angiography,  treatment options,  complications and other situations of  two groups were analyzed and compared  to explore the relevant risk factors of left heart failure. Results  The risks factors for the left heart failure in patients with acute myocardial infarction included many factors,  such as age,  the highest value of cTnI and CKMB,  percentage of STsegment resolution of ECG after emergency revascularization,  LAD lesion,  rightdominant type,  number of coronary artery lesions,  selective revascularization,  and the occurrence of arrhythmia and cardiogenic shock (P＜0.05). Conclusion  After the hospital admission of patients with acute myocardial infarction and right coronary artery as culprit blood vessel,  the general data of patients should be mastered in order to timely assess the highest values of cTnI and CKMB,  the percentage of STsegment resolution in ECG after emergency revascularization,  LAD lesions,  whether the artery is rightdominant,  the number of coronary artery lesions,  selective revascularization,  and whether arrhythmia and cardiogenic shock occur. When necessary,  timely response measures should be taken to reduce the risk of left heart failure and improve the prognosis of patients,  which is of great significance in clinical treatment.

Key words: myocardial infarction;culprit blood vessel, right coronary vessel, left heart failure, risk factors