How many hours should adults fast before anesthesia for elective surgery? How many hours should you abstain from drinking?

For elective surgery in adults, one should fast for 12 hours and drink for 4 hours before surgery; for elective surgery in children, one should fast for 4 to 8 hours and water for 2 to 3 hours before surgery. In fact, many documents now indicate that fasting and drinking times should not be so long in many surgeries. Too long will increase the risk of dehydration for patients. For example, adults generally fast for 6-8 hours (non-gastrointestinal surgery) and fast for 2 hours for children. They are fasting (milk) for 4 to 8 hours and water fasting for 1 to 2 hours.