What is the esophagogastroduodenoscopy (EGD) technique for percutaneous endoscopic gastrostomy (PEG) tube placement?

Updated: Dec 13, 2018
  • Author: Gaurav Arora, MD, MS; Chief Editor: Danny A Sherwinter, MD  more...
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Answer

The authors' approach is as follows. Esophagogastroduodenoscopy (EGD) is performed with a standard upper endoscope. Suction stomach contents to prevent aspiration. If the PEG tube is being placed for feeding, the physician should rule out obstruction in the gastric outlet and duodenum through direct examination during EGD.

The stomach is insufflated generously via the air channel on the endoscope.

At this time, the room lights should be dimmed. Next, the abdominal wall is transilluminated using the endoscope light. This is visible externally as a bright red or orange light on the abdominal wall. If necessary, the endoscope's light intensity can be increased from the base controls.

Finger pressure is applied at the point of maximal transillumination, and a focal indentation of the anterior gastric wall is visible endoscopically. This area should be at least 2.5 cm below the costal margin and away from the xiphoid process.

Once a good point on the abdominal wall is selected by using the above maneuvers, a surgical pen is used to mark the site.

The skin at this site is cleansed using the swab sticks containing povidone-iodine solution (provided in the PEG kit). This should be completed sequentially and in a concentric centrifugal fashion, moving away from the center.

The skin person changes into sterile gloves.

A sterile drape is placed over the abdomen, with the fenestrated center over the chosen site.

The site is anesthetized with lidocaine delivered via the 5-mL syringe and the longer needle included in the kit. The same needle can then be used as a "sounding" needle to ensure a safe tract for PEG tube placement. This is completed by passing this needle from the abdominal wall into the stomach (confirmed by endoscopic visualization) and noting its angle of entry.

After the needle passes through the skin, continuous suction should be maintained on it; if air bubbles are seen in the syringe before the needle enters inside the stomach, as assessed endoscopically, it may have entered the colon. If this happens, another entry tract should be sought.

Next, the scalpel is used to make a horizontal incision (0.5-1.0 cm wide, 2-3 mm deep) at the marked site.

The catheter-over-needle is then passed through this incision into the stomach. This maneuver should not be a slow deliberate push, which may allow the needle to push the stomach away; rather, it should be a rapid poke.

The needle-catheter should be visible inside the stomach cavity at this time. The endoscopist takes the snare from the kit and passes it through the working channel of the endoscope into the stomach.

The skin person removes the needle, leaving the plastic outer sheath of the needle-catheter assembly in place. The looped guide wire is then passed through this catheter into the stomach, where it is caught by the snare. This is then pulled out of the mouth along with the endoscope and is released from the snare and held by the endoscopist.

The catheter is then removed by threading it back over the guide wire.

The PEG tube is then secured to the looped end of the guide wire coming out from the mouth. This is performed by passing the guide wire loop through the PEG tube loop and then passing the other end of the PEG tube through the guide wire loop and then pulling the entire tube through it. This forms a square knot.

The PEG tube should then be lubricated.

The skin person now pulls the guide wire on the abdominal wall end so that the whole PEG tube goes through the mouth, esophagus, and stomach and emerges out of the incision site. This should be done in such a way that the internal bumper sits snugly against the gastric mucosa, with care taken to ensure that excessive tension is avoided.

The endoscopist then inserts the endoscope into the stomach to confirm adequate placement.

The external bumper is then passed over the external portion of the PEG tube, after the wire loop on the tube has been cut with the scissors and the tube has been lubricated again to facilitate the passage of the bumper over it. The external bumper should be placed about 1-2 cm away from the abdominal wall.

The excess portion of the tube, including the terminal dilator, is then cut away with the scissors, leaving approximately 15-20 cm of the tube behind.

The feeding adaptor provided in the kit is then pushed into the cut end.

Split gauze dressings are then applied over the external bumper (and not between the bumper and abdominal wall, so as to prevent excessive tension on the tissues), and the tube is then looped back and taped to the abdominal wall. The PEG tube can be safely used for feeding 4 hours after the procedure. [16, 17]

If transillumination, finger indentation, and adequate gastric insufflation are not achieved, consider aborting the procedure and assess for alternate access.

Antibiotic prophylaxis should be given to every patient (unless already on antibiotics) before this procedure is done so as to prevent peristomal infection. [15, 18]

The internal bumper should not be pulled too tightly against the gastric mucosa.

The external bumper should be 1-2 cm away from the abdominal wall.

The tube should be flushed and aspirated prior to completion of the procedure to ensure patency while the patient is still sedated.

The PEG tube insertion site should be cleaned daily. This can be completed with soap and water.


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