MBP and ileus: Five studies31,43,51,53,54 were included in the comparison of MBP+OAB versus MBP; 2 RCTs51,53 (879 patients) and 3 cohort studies (33,119 patients).31,43,54 Only 1 study43 provided a definition of ileus, with the other 4 studies31,43,53,54 not providing a definition.