Endoscopy is a nonsurgical procedure used to examine a person's digestive tract. Using an endoscope, a flexible tube with a light and camera attached to it, your doctor can view pictures of your digestive tract on a color TV monitor.
During an
upper endoscopy, an endoscope is easily passed through the
mouth and throat and into the
esophagus, allowing the doctor to view the esophagus,
stomach, and upper part of the small intestine.
Similarly, endoscopes can be passed into the large intestine (
colon) through the rectum to examine this area of the intestine. This procedure is called
sigmoidoscopy or
colonoscopy depending on how far up the colon is examined.
A special form of endoscopy called endoscopic retrograde cholangiopancreaticography, or
ERCP, allows pictures of the
pancreas,
gallbladder, and related structures to be taken.
Endoscopic
ultrasound or
EUS combines upper endoscopy and
ultrasound examination to obtain images and information about various parts of the digestive tract.
Why Do I Need an Endoscopy?
Doctors will often recommend endoscopy to evaluate:
In addition, your doctor may use an endoscope to take a
biopsy (removal of tissue) to look for the presence of disease.
Endoscopy may also be used to treat a digestive tract problem. For example, the endoscope might not only detect active bleeding from an ulcer, but devices can be passed through the endoscope that can stop the bleeding. In the colon, polyps can be removed through the scope to prevent the development of
colon cancer.
Also, using ERCP,
gallstones that have passed outside the gallbladder and into the bile duct can often be removed.
Is Endoscopy Safe?
Overall, endoscopy is very safe; however, the procedure does have a few potential complications, which may include:
- Perforation (tear in the gut wall)
- Reaction to sedation
- Infection
- Bleeding
- Pancreatitis as a result of ERCP
Who Performs Endoscopy?
Your internist or family doctor may perform sigmoidoscopy in their office. However, all of the other endoscopy procedures are usually performed by gastroenterology specialists (gastroenterologists). Other specialists such as gastrointestinal surgeons also can perform many of these procedures.
How Do I Prepare for Endoscopy?
Gut Preparation. Examining the upper digestive tract (upper endoscopy or ERCP) requires nothing more than
fasting for 6-8 hours prior to the procedure. To examine the colon, it must be cleared of stool. Therefore, a laxative or group of
laxatives is given on the day before the procedure.
Sedation. For most examinations with an endoscope, a sedative is provided. This increases the comfort of the individual undergoing the examination. The sedative, which is administered via an injection into the vein, produces relaxation and light
sleep. There are usually few if any recollections of the procedure. Patients wake up within an hour, but the effects of the medicines are more prolonged, so it is not safe to drive until the next day.
General anesthesia (puts you totally asleep for a period of time) is given in only very special circumstances (in young children, and when very complex procedures are planned).
