1. Understand the medical history, physical examination, out-of-hospital barium enema film, or previous colonoscopy results.

2. 3 days before the examination, eat a non-slag, low-slag semi-fluid diet, and start fasting the night before (2 hours before the operation, you can eat dry food, but do not drink water).

3. intestinal preparation

① 1 day before the examination at 8 pm oral castor oil 30 ml. (afternoon examination in the morning to take)

② morning examination at 3 in the morning to take 30g of potassium and sodium salts (add 6 pounds of water within 1.5 hours to finish), afternoon examination at 8 am to take 30g of potassium and sodium salts, cardiac and renal insufficiency is prohibited. Or fasting on the night before the examination and oral castor oil 30ml at 18:00, the next morning at 5:00 oral 20% mannitol 250ml plus warm water 250ml, and then every 20min drink warm water 250ml, *** drink 3 times, the effect is better. Or the night before and the next morning each clean enema.

③ Preoperative medication

Atropine 1mgHist or Valium 10mgimst, intraoperative intestinal spasms can be included in the 10mg cardioplegia, or preoperative application of cardioplegia 10mgTid or Spartan 40mgTid × 3 days.

4. Polypectomy patients should be prepared for blood type, PT, and routine blood tests.

The colonoscopist will have to choose for you, do you understand it, thank you for naming it.

The colonoscopist will choose the specifics for you, do you understand?