MBP and ileus: Overall, the combination of MBP+OAB was associated with a significant reduction in the incidence of postoperative ileus (RR 0.83, 95% CI 0.73–0.95, P = 0.008, I2 = 0%), mostly determined by the large single cohort study.31 However, no difference was seen when RCTs were considered (RR 1.25, 95% CI 0.68–2.33, P = 0.47, I2 = 0%).