Comparison of intrathecal morphine, lateral quadratus lumborum block, and their combination for analgesia and quality of recovery after Caesarean delivery: a randomised, double-blind, two-centre clinical trial.

Noninferiority testing for quality of recovery-40 at 24 h between intrathecal morphine and quadratus lumborum block was inconclusive (mean difference -0.9; 90% confidence interval [CI] -0.9 to 13.5).

Compared with intrathecal morphine alone, intrathecal morphine+quadratus lumborum block reduced the resting pain at 6 h (mean difference 3.3 [1.9, 4.8]; P<0.001), coughing pain at 6 h (3.0 [1.4, 4.7]; P<0.001), and worst pain at 24 h (1.8 [0.6, 3.1]; P=0.006).

Oxycodone consumption and nausea or vomiting did not differ between groups.