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44, 95% CI = 0.88-2.36, I2  = 51%). In the stratified analysis, in the patients who had undergone heart surgery, the average of ejection fraction (EF) in the opium users was significantly lower than those not using opium (mean differences -3.06, CI 95% = -4.40 to -1.71, I2 = 60%) but in the patients with acute myocardial infarction undergoing angiography, the average EF was not significantly different in the opium users compared to non-users (mean difference 0.30, CI -0. 55 to 1.15). The results of this meta-analysis revealed that opium m