Background
pain, Cancer
GASTROINTESTINAL CANCER, CANCER
More than two million people die of gastrointestinal cancer, accounting for approximately 60% of new cases, based on Global Cancer Statistics 2018 [Propofol is widely used in endoscopy due to its fast onset of action, short action time, and quick and complete postoperative recovery [Butorphanol is a mixed opioid receptor agonist and antagonist that acts on κ receptors [In this randomized controlled study, we intended to confirm that butorphanol can significantly improve postoperative visceral pain, reduce the dosage of propofol needed and improve quality in patients undergoing gastroscopy and colonoscopy.