How many hours should adults fast before elective surgery anesthesia? How many hours are you forbidden to drink?

Adult elective surgery, preoperative fasting should be 65438 02 hours, 4 hours; Before elective surgery, children should fast (breastfeed) for 4 ~ 8 hours and drink water for 2 ~ 3 hours. In fact, many documents now show that fasting and drinking in many operations is not that long. Excessive time will increase the risk of dehydration of patients. For example, adults generally fast for 6-8 hours (non-gastrointestinal surgery), drink water for 2 hours, children fast for 4-8 hours (milk), and drink water for 65,438+0-2 hours respectively.