ESD - Endoscopic Submucosal Dissection (Colon)

This is a procedure that uses an endoscope (a flexible tube) to remove lesions confined to the mucous membrane. In the past, such lesions were removed surgically. With this new technique, the lesions can be safely removed without scarring and without surgery, resulting in a shorter hospital stay.

These are usually lesions that (if left untreated) could become malignant or are already superficially malignant but have not yet invaded deeper than the mucosa. Sometimes, an endoscopic ultrasound examination is performed beforehand to confirm the depth. This technique is used to remove larger lesions so that they can be excised in one piece.

Please report the following during the preliminary consultation and also before the start of the investigation:

• any allergies.
• heart and/or lung problems, pacemaker, defibrillator, neurostimulator, ...
• Taking blood-thinning medication, such as aspirin-containing preparations like Plavix, Marcoumar, Clopidogrel, Ticlid, Xarelto, Pradaxa, Eliquis, Brilique, Marevan, Sintrom… Blood-thinning medication may need to be discontinued in a timely manner, always in consultation with your doctor.
• taking anti-inflammatory medications.

• An IV will be inserted in your room, and you will be asked to remove your glasses, contact lenses, and dentures. A patient gown will be provided for you to put on.
• Female patients will be asked to remove their bras.
• You must fast for at least 6 hours before the test. This means you should not eat, drink, or smoke.
• Just as with a colonoscopy, your bowel must be completely empty. You will therefore need to drink a specific laxative solution beforehand. (See also the information about colonoscopies.)

• This procedure is performed in the endoscopy unit under general anesthesia. If this has not already been done in the patient’s room, the nurse will insert an IV into a vein in the arm so that the anesthesiologist can administer the anesthesia through it.
• The anesthesiologist sometimes inserts a tube into the airway to take over breathing.
• During the exam, you will lie on your left side or on your back.
• During the test, the oxygen level in your blood is measured continuously. This is done using a small device placed on your finger. You will also be given a pair of oxygen goggles to wear over your nose.
• In some cases, a dose of antibiotics is administered as a preventive measure during the procedure.

The Treatment

The endoscope is used to clearly delineate the lesion, which is then marked all around so it can be completely removed with a wide margin. Next, a thin needle is used to inject fluid between the muscle layer and the layer to be removed, allowing for safe operation. An incision is made around the lesion using a very fine electric scalpel. The lesion to be removed is then completely detached from the muscle layer using the fine scalpel. Finally, the wound is carefully inspected, and all blood vessels are cauterized with an electric current to prevent bleeding. The duration of the treatment varies depending on the size and location of the lesion: between 60 and 180 minutes. The removed lesion is collected and sent for subsequent microscopic examination.

• After the procedure, the patient is taken to the recovery room of the endoscopy unit. There, the oxygen level in the blood is monitored further.
• You may also experience bloating due to the carbon dioxide that was introduced during the exam. Burping or passing gas can provide quick relief.
• After this procedure, patients are usually hospitalized for one or two nights.
• After the procedure, you can usually start a low-residue diet right away, which is often expanded to a normal diet fairly quickly.
• If you have a high fever, unbearable pain, or rectal bleeding, you should contact the department or the doctor who treated you.

Bleeding

The procedure may cause a small blood vessel to be damaged. This is normal during the procedure and can almost always be stopped. Delayed bleeding between the first and 14th day is possible; this manifests as blood in the stool. If this occurs, a new endoscopy must be performed to stop the bleeding. Delayed bleeding can occur in about 5 percent of procedures.

Perforation

This creates a small hole in the muscle layer, resulting in an open passage between the treated organ and the abdominal cavity. This complication is rare and can occur in about 4 percent of procedures. In this case, antibiotics must be administered, and an attempt is usually made to close the hole endoscopically.

Stenosis

During the healing process, this causes a narrowing of the treated organ, preventing stool from passing through properly. This complication is very rare and can almost always be resolved by dilating the narrowing with a small balloon.