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Important to note that the 9 studies included for meta-analysis (524 patients in total) were quite heterogenous: 7 performed under spinal anaesthesia and 2 under general; TAP performed using anatomical landmarks in 3 and ultrasound in 6; spinals used various doses of fentanyl and/or morphine; and the TAP blocks used ropivacaine (4), bupivacaine (4) or levobupivacaine (1). Post-operative analgesic regimes also varied.
Thus these findings should be cautiously applied to your local setting.