Mask acceptance: Induction of anesthesia, or the beginning of the process for the patient to fall asleep and lose consciousness, involves placing a mask over there face, specifically the nose and mouth. The mask is connected to their anesthesia machine via tubing, or a circuit, through which their anesthetic gases flow. Some children fight the mask as it can be seen as new and frightening. Other children, sometimes depending on how sedated they are after receiving a premedication, do not fear the mask on their face and do not resist induction. How well or easily this happens can be described as "mask acceptance." Postoperative delirium can be seen in patients of any age or after any surgery and can be better defined as a mental disturbance during the recovery from general anesthesia consisting of hallucinations, delusions, and confusion manifested by moaning, restlessness, involuntary physical activity, and thrashing about in bed. It has been considered a common postanesthetic problem in children and adults since 1960.