10.3 Percutaneous Tube Complications: Dislodgement, Blockage, Leakage & Hypertrophic Tissue
Key Takeaways
- Dislodgement of a tube from an immature tract, less than roughly four to six weeks old, is an emergency: the tube is not blindly reinserted because the viscus may have separated from the abdominal wall, risking free perforation and peritonitis.
- A mature gastrostomy tract can begin to narrow within hours of dislodgement, so preserving tract patency — with a same-size replacement tube or a Foley catheter if permitted by protocol — is time-critical.
- Buried bumper syndrome presents as the triad of resistance to infusion, peritubular pain, and a tube that cannot be rotated or advanced, and is prevented by correct bolster clearance and routine rotation of bumper-retained PEGs.
- Peritubular hypertrophic (granulation) tissue is friable, bleeds on contact, and is driven by movement and moisture; treatment combines improved stabilisation with silver nitrate cautery or a topical corticosteroid, not with more absorptive dressing alone.
- New leakage around a previously dry tube is a symptom, not a diagnosis: look for raised intragastric pressure, a deflated retention balloon, a migrated tube, or an enlarged tract before treating the skin.
Percutaneous Tube Complications: Dislodgement, Blockage, Leakage & Hypertrophic Tissue
Quick Summary: The blueprint names the complication set explicitly — "dislodgement, hypertrophic tissue, blockage, leakage." Exam items in this area are almost always triage questions: given a described complication, is this something the nurse manages, or something that must be escalated within minutes?
Dislodgement: The Tract Maturity Rule
Everything turns on how old the tract is.
| Immature tract (< ~4–6 weeks) | Mature tract (> ~4–6 weeks) | |
|---|---|---|
| Anatomy | Viscus not yet fused to abdominal wall | Fibrous channel joins viscus to skin |
| Risk on blind reinsertion | Tube enters peritoneum; feeding causes chemical peritonitis | Tube follows the established channel |
| Nursing action | Do not reinsert. Cover site, keep patient nil by mouth, notify provider urgently | Preserve patency promptly; replace per institutional protocol |
| Confirmation before use | Imaging with contrast, mandatory | Per protocol; confirm placement before feeding |
The reason blind reinsertion is forbidden in an immature tract is anatomic: the stomach or jejunum has not yet adhered to the anterior abdominal wall, so the tube can pass into the peritoneal cavity while appearing to be correctly sited. Instilling feed through such a tube delivers formula directly into the peritoneum.
In a mature tract the risk inverts. Gastrostomy tracts can narrow appreciably within a few hours and may become impassable within 24 hours. Where institutional protocol permits, a same-size replacement tube — or a Foley catheter of comparable French size used solely as a tract-preserving placeholder — is inserted promptly, secured, and left to drain while imaging confirmation is arranged. A placeholder is never used for feeding until placement is confirmed.
Blockage
Blockage in a feeding tube usually reflects inadequate flushing, crushed solid medication, or acidic fluid precipitating formula protein. Management was covered in the previous section: warm water, a 60 mL syringe, gentle push-pull, and an ordered enzyme-based declogging agent if needed.
Blockage in a drainage device presents differently and more dangerously, because the first sign is often not resistance but a fall in output:
- A nephrostomy whose output stops while flank pain and fever develop is obstructed or dislodged until proven otherwise.
- A biliary drain whose output turns serous or ceases while bilirubin climbs is occluded.
- A closed suction drain whose output ceases while the abdomen distends or the incision begins to leak has failed, and the fluid is going somewhere else.
Because occlusion and dislodgement produce the same output picture, both are provider escalations, not bedside flush attempts, unless an explicit irrigation order exists.
Buried Bumper Syndrome
This is the classic complication of a bumper-retained PEG and appears frequently on examinations because it has a clean triad:
- Resistance to infusion — the feed will not run.
- Peritubular pain, often with leakage.
- Loss of tube mobility — the tube cannot be rotated or advanced.
The mechanism is chronic compression of the gastric wall between an internal bumper and an over-tightened external bolster. Ischaemia allows the mucosa to grow over and eventually encase the internal bumper. Prevention is entirely nursing-controlled: maintain 0.5 to 1 cm of bolster clearance and rotate bumper-retained PEGs during routine care. Once buried, the device requires endoscopic or surgical removal — it is never pulled.
Hypertrophic and Granulation Tissue
Peritubular granulation tissue appears as a moist, red, friable, glistening collar at the exit site that bleeds with minimal contact and may weep serous fluid. Two forces produce it: repetitive movement of the tube within the tract, and persistent moisture at the exit site.
Treatment is therefore two-part, and the first part is the one candidates omit:
- Eliminate the stimulus. Improve securement, correct bolster clearance, and dry the site. Cauterising granulation tissue while leaving the tube unsecured guarantees recurrence.
- Reduce the tissue. Options include silver nitrate cautery applied precisely to the granulation and not to intact surrounding skin, a topical corticosteroid such as triamcinolone for a short defined course, or a foam dressing that applies light pressure.
Warning: Granulation tissue that is hard, irregular, ulcerated, or fails to respond to appropriate therapy is not assumed to be granulation. Malignancy can seed a gastrostomy tract in patients with head-and-neck or oesophageal cancer, and persistent atypical tissue warrants biopsy rather than repeated cautery.
Leakage
New leakage around a previously dry tube is a symptom with a differential, and treating the skin without diagnosing the cause is the most common error:
| Cause | Clue | Action |
|---|---|---|
| Deflated retention balloon | Tube slides in and out easily; balloon volume low on check | Check and reinflate balloon volume per manufacturer instructions |
| Tube migration | External length markings changed | Reassess placement; escalate |
| Raised intragastric pressure | Constipation, ileus, retching, coughing, large boluses | Treat the pressure source |
| Enlarged tract | Long-dwelling tube, chronic movement | Stabilise, contain; do not upsize |
| Delayed gastric emptying | High residuals, bloating | Review feeding regimen and prokinetic therapy with the team |
COMPLICATION TRIAGE
Dislodged, tract IMMATURE ......... EMERGENCY - do not reinsert, NPO, notify now
Dislodged, tract MATURE ........... URGENT - preserve tract, replace per protocol
Cannot rotate + pain + resistance .. Buried bumper - endoscopic referral
Drain output suddenly stops ....... Occlusion vs dislodgement - escalate
Friable red collar at exit site ... Granulation - stabilise, then cauterise
New leakage ....................... Find the cause before dressing the skin
A gastrostomy tube placed 10 days ago is found on the bed linen. The patient is comfortable and the site is intact. What is the correct nursing action?
A patient with a PEG tube placed two years ago reports pain during feeding. The nurse finds that formula will not infuse, the tube cannot be rotated, and there is leakage at the exit site. What complication is most likely, and what is the appropriate action?
An ostomy nurse is asked to treat a moist, red, friable collar of tissue that bleeds easily at a long-standing gastrostomy exit site. Which plan is most appropriate?
A nephrostomy tube that has been draining 700 mL of urine daily suddenly produces almost no output. The patient develops flank pain and a temperature of 38.6°C. What is the priority interpretation?