Is it normal for a percutaneous endoscopic gastrostomy (PEG) tube site to produce a hissing sound when the abdomen is palpated?

Medical Advisory BoardAll articles are reviewed for accuracy by our Medical Advisory Board
Educational purpose only • Exercise caution as content is pending human review
Article Review Status
Submitted
Under Review
Approved

Last updated: May 29, 2026 • View editorial policy

Have a follow-up question?

Our Medical A.I. is used by practicing medical doctors at top research institutions around the world. Ask any follow up question and get world-class guideline-backed answers instantly.

Ask Question

A Hissing Sound at a PEG Tube Site is NOT Normal and Requires Immediate Evaluation

A hissing sound on palpation of the abdomen near a PEG tube site is abnormal and suggests air leakage, which may indicate serious complications including pneumoperitoneum, tube displacement, or tract disruption that could lead to peritonitis.

Understanding the Clinical Significance

While pneumoperitoneum (air in the peritoneal cavity) is radiologically common after PEG placement—occurring in more than 50% of cases—it is typically asymptomatic and not associated with audible sounds 1. The presence of an audible hissing sound suggests:

  • Active air movement through an abnormal pathway
  • Potential tract disruption between the stomach and abdominal wall
  • Tube malposition or displacement
  • Gastrocutaneous fistula with air leakage

Immediate Assessment Required

When encountering a hissing sound at a PEG site, evaluate for:

Red Flag Signs (Require Urgent Intervention)

  • Abdominal pain or peritoneal signs
  • Fever or systemic signs of infection
  • Resistance to feeding or inability to infuse formula
  • Leakage of gastric contents around the tube site
  • Recent tube manipulation or replacement

Timing Considerations

The gastrocutaneous tract typically matures within 7-10 days but may take up to 4 weeks in patients with malnutrition, ascites, or corticosteroid use 2. A hissing sound during this early period is particularly concerning as the tract is immature and the stomach can separate from the abdominal wall, causing free perforation 2.

Differential Diagnosis and Management Algorithm

1. Tube Displacement or Malposition

  • The tube may have migrated partially out of the stomach
  • Action: Stop all feeding immediately, obtain contrast study or endoscopy to confirm tube position
  • If confirmed displaced and patient has peritoneal signs: surgical consultation required 2

2. Tract Disruption

  • More likely if tube was recently replaced or manipulated
  • The gastrocutaneous tract in PEG is more friable than surgical gastrostomy (no suture fixation) 3
  • Action: Imaging with contrast to assess tract integrity; if disrupted with intraperitoneal placement, surgical intervention usually required 3

3. Buried Bumper with Air Tracking

  • Occurs in 0.3-2.4% of patients when gastric mucosa grows over the internal bumper 2
  • May present with peritubal leakage, immobile tube, and resistance to feeding
  • Action: Endoscopic or radiographic confirmation; endoscopic removal and replacement typically needed 2

4. Colocutaneous Fistula

  • Uncommon but serious complication where colon is inadvertently involved
  • May present with stool leaking around tube or diarrhea during feeding 2
  • Action: Radiographic identification; usually managed by tube removal, but surgery may be required if peritonitis develops 2

Conservative vs. Aggressive Management

The guidelines emphasize that even with pneumoperitoneum and abdominal pain, initial conservative treatment is appropriate since severe cases are rare 1. However, this applies to asymptomatic radiologic findings, not audible air leakage.

For a hissing sound specifically:

  • Stop feeding immediately until tube position confirmed
  • Obtain imaging (contrast study or CT) to assess for:
    • Tube position
    • Tract integrity
    • Free air or fluid in peritoneum
    • Involvement of other organs
  • Monitor closely for development of peritonitis

When to Escalate to Surgery

  • Signs of peritonitis or hemodynamic instability
  • Confirmed intraperitoneal tube placement with feeding
  • Colocutaneous fistula that fails to heal after tube removal
  • Patient decompensation despite conservative measures 2

Common Pitfalls to Avoid

  1. Assuming benign pneumoperitoneum: While common radiologically, an audible hiss suggests active pathology
  2. Continuing feeds without confirmation: Can lead to chemical peritonitis if tube is malpositioned
  3. Blind tube replacement: Never replace a tube without confirming tract maturity and integrity, especially if there are concerning signs
  4. Delaying imaging: Early identification of complications prevents progression to life-threatening peritonitis

Bottom Line

The hissing sound represents abnormal air movement that warrants immediate cessation of feeding and diagnostic evaluation to rule out serious complications that could progress to peritonitis and death if unrecognized.

References

3
Research

Percutaneous endoscopic gastrostomy tube replacement: A simple procedure?

World journal of gastrointestinal endoscopy, 2013

Related Questions

What is the first step in evaluating a patient with a percutaneous endoscopic gastrostomy (PEG) tube who has experienced vomiting?
How should I evaluate and manage an 80-year-old man with difficulty falling asleep, chest and head tremor sensations, and frequent awakenings?
What is the recommended evaluation and management for a 3-year-old who refuses to bear weight on a leg without pain?
In a 6‑week gestation, can a transvaginal ultrasound show only a yolk sac with no fetal pole?
What is the cause of a 7‑month‑old infant who has hiccup‑type respirations, no fever, periods of inconsolable crying that worsen when lying flat, a tense abdomen on palpation, normal stools today, adequate feeding, and normal breath sounds?
What does an elevated IgA level with increased free kappa light chains and a high kappa-to-lambda ratio indicate, and what initial hematologic evaluation is recommended?
How often should high-sensitivity troponin be repeated when there is a large increase on the third measurement?
What is the appropriate treatment protocol after administering glucagon to a patient with severe hypoglycemia (blood glucose 20 mg/dL)?
Is torsemide superior to furosemide (Lasix)?
Does torsemide have a longer half-life than furosemide?
In pre‑diabetes, which is preferred as primary therapy: metformin or myo‑inositol?

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.