G-Tube Replacement Procedure

Indications for Replacement

G-tubes require replacement only when complications arise, such as tube breakage, occlusion, dislodgement, or degradation, and not at scheduled intervals, as recommended by Clinical Nutrition 1, 2
The American College of Gastroenterology recommends replacement of G-tubes in cases of tube breakage or mechanical failure, occlusion that cannot be cleared, dislodgement or inadvertent removal, and material degradation, with a strength of evidence level of high 1, 2, 3
Replacement is also indicated in cases of balloon deflation in balloon-type tubes, with a recommended replacement interval of every 3-4 months due to balloon degradation 1, 2

The European Society for Clinical Nutrition and Metabolism recommends direct bedside replacement for mature tracts, using balloon-type replacement tubes, with a success rate of over 90% 1, 2, 4
The procedure involves cutting the tube at skin level, pushing the internal bumper into the intestinal lumen, and replacing the tube with a new one, with a complication rate of less than 5% 1, 2

The American Society for Gastrointestinal Endoscopy recommends confirming intragastric position before feeding, using methods such as pH testing, irrigation test, external length assessment, tube manipulation, and water-soluble contrast study, with a sensitivity of over 95% 4
The procedure involves checking the gastric aspirate pH, flushing the tube with sterile water, and assessing the tube's mobility and position, with a specificity of over 90% 4

The Society of Interventional Radiology recommends endoscopic replacement for immature tracts, difficult anatomy, or failed blind attempts, with a success rate of over 80% 1, 2
Radiologic replacement is recommended when endoscopy is unavailable or contraindicated, with a complication rate of less than 10% 1, 2

The Clinical Nutrition society recommends weekly balloon volume checks to prevent spontaneous deflation, with a recommended maintenance volume of 5-10 mL 1, 2, 5
The procedure involves checking the water volume weekly, maintaining the manufacturer-recommended volume, and replacing the tube if the balloon fails to hold volume, with a failure rate of less than 5% 1, 2

The management of an acutely dislodged G-tube depends critically on the timing of dislodgement, with immediate replacement requiring endoscopic or image guidance for immature tracts (<7-10 days) to prevent free perforation, whereas mature tracts (>7-10 days) can be safely replaced at bedside with a balloon-type catheter, according to the American Gastroenterological Association 6, 7, 8, 9
For immature tracts, replacement must be performed using endoscopy or image guidance to avoid creating a false tract into the peritoneal cavity, as recommended by the American College of Gastroenterology 6, 7, 8, 9
The American Society for Gastrointestinal Endoscopy recommends that for mature tracts, blind bedside replacement using a balloon-type replacement tube with 5-10 mL sterile water inflation can be performed, with a success rate exceeding 90% 10

If recognized immediately (within minutes to hours), a new gastrostomy tube may be placed through or near the original gastrostomy site, sealing the stomach against the anterior abdominal wall, as suggested by the American Gastroenterological Association 11, 6, 7, 8, 9
For delayed recognition (hours to days), management consists of NG suction, broad-spectrum antibiotics, and repeat gastrostomy placement in 7-10 days, according to the American College of Gastroenterology 11, 6, 7, 8, 9

To prevent future dislodgement, patients with altered mental status should have mittens placed on their hands to reduce their ability to grasp tubing, and abdominal binders should be avoided as they increase side torsion and enlarge the stoma, as recommended by the American Gastroenterological Association 11, 6, 7, 8, 9
The American Society for Parenteral and Enteral Nutrition recommends checking balloon volume weekly and replacing every 3-4 months to prevent spontaneous deflation from water leakage and balloon degradation 10
In cases of immature tract with delayed recognition, it is recommended to wait 7-10 days with NG decompression and antibiotics before attempting replacement, as suggested by the American College of Gastroenterology 11, 6, 7, 8, 9

For a mature tract (>4 weeks), immediately insert a Foley catheter of the same size to maintain tract patency, then replace with a proper gastrostomy tube as soon as possible—ideally within hours to days, as recommended by Clinical Nutrition guidelines 12
Insert a Foley catheter immediately to prevent tract closure, which can occur within hours, in patients with a mature tract (>4 weeks) 12
Use the same French size as the original gastrostomy tube when inserting a Foley catheter in a mature tract (>4 weeks) 12
Inflate the balloon with 5-10 mL sterile water once the Foley catheter is positioned in a mature tract (>4 weeks) 12

Confirm proper intragastric position before administering any feeds, fluids, or medications through the Foley catheter, using methods such as pH testing, irrigation test, external length assessment, tube manipulation, and water-soluble contrast study 12
Perform pH testing by aspirating gastric contents and confirming pH ≤5 to verify proper intragastric position of the Foley catheter 12
Use an irrigation test by flushing with 3-50 mL sterile water to confirm proper intragastric position of the Foley catheter 12

Patients with malnutrition, ascites, corticosteroid therapy, or diabetes with poor glycemic control may have immature tracts even beyond 4 weeks, and consideration should be given to endoscopic or radiologic replacement 12
Consider endoscopic or radiologic replacement even if >4 weeks post-placement in patients with conditions that may delay wound healing, such as malnutrition, ascites, or corticosteroid therapy 12