Why is Colonoscopy performed | Pre-operative Preparations | Procedures | Post-operative Instructions | Possible Risks and Complications
Colonoscopy is a procedure that enables the examiner to view the inside of the large bowel. This is accomplished by passing a flexible video-endoscope through the anus into the rectum, then advancing slowly through sigmond colon, descending colon, transverse colon, ascending colon and lastly to the caecum. The examiner can have direct vision of the colon or pathological changes inside the colon, such as tumor, ulceration or polyps. Doctor may take biopsy for pathological examination, perform polypectomy and therapeutic haemostasis when necessary.
Why is Colonoscopy performed?
Bowel Preparation Video
Bowel preparation can be carried out at home or in the hospital.
The day before colonoscopy, Only fluid diet is allowed, such as clear meat soup and thin congee. Please do not consume too much dairy products.
Two days before colonoscopy, The client can only consume low residue diet (avoid food which is rich in fiber, e.g. vegetable, fruit, cereal etc).
No oral intake is allowed six hours before colonoscopy.
Change into a surgical gown after removing all belongings.
Colonoscopy takes about 30 minutes
Stay in bed until the sedative effect of drug has been completely worn off
Possible Risks and Complications
- Laxative for bowel preparation may cause nausea, vomiting, abdominal pain or distension, etc.
- Injection of sedation may cause hypotension, respiratory difficulties. For severe cases, anaphylaxis and anaphylactic shock may be developed. The probability of developing such symptoms is higher for the elderly.
- Perforation (2:1000); the probability of developing major complications is higher for those clients who need to have therapeutic procedure (e.g. polypectomy, endoscopic haemostasis, dilatation and insertion of stent).
- Perforation of bowel leading to peritonitis. Laparotomy under general anaesthesia may be required or repair or resection of bowel. The death rate is 5 in 100.
- May experience abdominal pain or distension etc. It will improve about one hour after examination.
- Bleeding may occur after polypectomy (1:1000), which usually happens within 24 hours of examination