Different Maneuvers for Reducing Post-laparoscopic Pain

* Laparoscopic surgeries are becoming more attractive because of early recovery. However, post-laparoscopic shoulder and upper abdominal pain may cause more discomfort to the patient than the pain at the incision site * Many strategies have been attempted, such as the use of nonsteroidal anti-inflammatory drugs; however, the effect is limited, and there are no reliable methods available yet. * Recently, some techniques are introduced that can potentially alleviate various types of pain through different mechanisms in patients after laparoscopic surgery such as low-pressure pneumoperitoneum, intraperitoneal normal saline infusion, and pulmonary recruitment maneuvers. * the investigators conduct this randomized controlled trial to evaluate the effectiveness of different strategies on reducing the intensity of post-laparoscopic shoulder and abdominal pain in patients undergoing laparoscopic gynecologic surgeries.