Interventional, comparative, randomized, controlled study versus reference therapeutic strategy, in 2 parallel groups, double-blind (patient and evaluator), single-center, aiming to demonstrate the superiority of ropivacaine in square lumbar block versus intrathecal morphine, on the efficacy of post-operative analgesia, following a scheduled caesarean.
To demonstrate the superiority of square lumbar block to ropivacaine compared to intrathecal morphine in the efficacy of postoperative analgesia following scheduled caesarean.