Abstract: ObjectiveTo explore the impact of hypokalemia on longterm prognosis of  patients with acute myocardial infarction and establish COX multiple prognostic risk factors model for these patients.  MethodsA total of 446 AMI inpatients undergoing percutaneous coronary intervention were consecutively enrolled in this study and divided into two groups: hypokalemia(K)＜3.5  mmol/L (n=123) and normal control，3.5≤K＜5.5 mmol/L (n=233). All the demographic and clinical data were collected by the physicians and master degree students in the departemnt， and then the prognosis of these patients were assessed  after regular followup.  ResultsThe rates of MACE of the patients with hypokalemia were significantly higher than  those  in normal control group (17.1% vs 9.9%，P＜0.05). Hypokalemia group had higher mortality than normal control group，but the difference was not significant (3.4% vs 1.3%，P＞0.05).  The Cox proportional regression model of multiple prognostic risk factors showed that hypokalemia， ST elevation myocardial infarction， and hidden chest pain were all independent risk factors poor longterm prognosis of AMI patients(all  P＜0.05).  ConclusionHypokalemia is an independent risk factor  of  the poor longterm prognosis of AMI patients.

Key words: hypokalemia, angioplasty, transluminal, percutaneous coronary; , myocardial infarction, risk factors, prognosis