INS and type 2 diabetes mellitus: Our study is a randomized, double-blind, parallel controlled study to determine the impact of total intravenous anesthesia and total inhalation anesthesia as the main maintenance general anesthesia approaches on the blood glucose, cortisol, insulin and postoperative complications in patients with type 2 diabetes, in whom few adequate randomized controlled trials on perioperative blood glucose with type 2 diabetes undergoing abdominal surgery has been conducted.