Forest plot of major bleeding: the measure of the effect of morphine versus nonmorphine on major bleeding in each study was plotted using OR and 95% CI. The overall results indicate no significant difference between both groups. Forest plot of major bleeding: the measure of the effect of morphine versus nonmorphine on major bleeding in each study was plotted using OR and 95% CI. The overall results indicate no significant difference between both groups. Rugheed Ghadban et al. Heart Asia 2019;11:e011142 Copyright © Asia Pacific Heart Association, British Cardiovascular Society & BMJ Publishing Group Ltd. All rights reserved.