 240 patients will be randomly assigned to one of four groups Upon completion of surgery, the patient is placed in the Trendelenburg position 30 degrees, and one of four procedures is followed. For group A control, 50 ml of normal saline is instilled under the diaphragm and CO2 is removed by manual deflation of the abdominal cavity through the cannula; For group B, a mixture of 50ml solution 20ml of 0.5 bupivacaine 30ml normal saline is instilled under the diaphragm and CO2 is removed by manual deflation of the abdominal cavity through the cannula; For group C, 50 ml of normal saline is instilled under diaphragm and CO2 was removed by means of a pulmonary recruitment maneuver consisting of five manual inflations of the lung with a maximum pressure of 30 cm H2O. The anesthesiologist holds the fifth positive pressure inflation for approximately 5 seconds. During these maneuvers, the surgeon will be instructed to ensure that the trocar sleeve valve is fully open to allow the CO2 gas to escape. For group D, patients receive an instillation of a mixture of 50ml solution in combination with the clinical maneuver. 