Abstract:〔Abstract〕 Objective To analyze the effects of metoprolol combined with amiodarone on oxidative stress and inflammation in patients with acute myocardial infarction complicated with arrhythmia. Methods A total of 76 patients with acute myocardial infarction complicated with arrhythmia admitted to Nanyang Central Hospital from February 2022 to November 2022 were randomly divided into a control group and an observation group, with 38 patients in each group. The control group was treated with metoprolol, and the observation group was treated with metoprolol combined with amiodarone. The levels of inflammatory factors, oxidative stress indexes, cardiac function and adverse reactions were compared between the two groups. Results After treatment, The left ventricular end-diastolic volume (LVEDV), left ventricular end-systolic volume (LVESV), the levels of serum interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), C-reactive protein (CRP), superoxide dismutase (SOD), malondialdehyde (MDA) and lipid peroxidase (LPO) in the observation group were lower than those in the control group, the left ventricular ejection fraction (LVEF) in the observation group was higher than that in the control group, and the differences were statistically significant (P < 0.05). There was no significant difference in the incidence of adverse reactions between the two groups (P > 0.05). Conclusion Metoprolol combined with amiodarone can effectively treat arrhythmia in patients with acute myocardial infarction, improve cardiac function, relieve oxidative stress and reduce the level of inflammatory factors, with high safety.