Quadratus Lumborum Block Versus Transversus Abdominis Block . Randomized Clinical Trial.

: the sample will be divided into three groups and all participants will receive general anesthesia. Patients in the placebo group (PG) will be referred to the post-anesthesia recovery room after extubation and adequate hemodynamic and respiratory recovery. Patients in the tap block group (TBG) will receive 0.2 ml of 0.25% ropivacaine between the transverse and oblique internal muscles guided by ultrasound (US), on one side and after the other (the same dose), after the end of surgery. Patients in the quadratus lumborum group (LQG) will receive 0.2 ml/kg of 0.25% ropivacaine inside the middle layer of the thoracolumbar fascia guided by US, on one side and after the other (the same dose), after the end of the surgery. In all participants, the monitoring will include cardioscope, oximetry, non-invasive blood pressure and monitor of hypnoses level. After peripheral venous puncture, antibiotic prophylaxis with 2g cefazolin, and pre-anesthetic medication with midazolam 0.05 mg/kg. After 5 min pre-oxygenation, the patients will receive venous anesthetic induction with 2% lidocaine 1mg/kg without vasoconstrictor; fentanyl 4 µ/kg; propofol 2 mg/kg, or even adequate hypnosis guided by proper monitor; cisatracurium 0.15mg/kg, with tracheal intubation and mechanical ventilation after anesthetic plan confirmed with proper monitor and adequate muscle relaxation. Anesthesia will be maintained with propofol in continuous infusion guided by hypnoses monitor and remifentanil in continuous infusion between 0.1 and 0.5 µg/kg/min, according to patient need. All study participants will receive ondansetron 8 mg, dipyrone 2 g, ketoprofen 100 mg, dexamethasone 10 mg and morphine 3 mg. At the end of the surgery, after partial recovery from neuromuscular blockade, patients will receive atropine 0.01 mg/kg and neostigmine: 0.02mg/kg before tracheal extubation.