Why is a nasogastric tube (NGT) placed in postoperative patients?

Routine Nasogastric Tube Placement After Surgery Should Be Avoided

Nasogastric tubes should NOT be routinely placed in postoperative patients, as prophylactic use provides no clinical benefit and actually worsens outcomes including delayed return of bowel function, increased pulmonary complications, patient discomfort, and delayed oral intake. 1

Evidence-Based Approach to NGT Use

The Case Against Routine Placement

The most recent and authoritative evidence comes from the 2023 ERAS Society guidelines for emergency laparotomy, which explicitly recommend selective or therapeutic use only rather than routine prophylactic placement 1. This recommendation is supported by:

• A Cochrane review of 33 RCTs (5,240 patients) showing patients WITHOUT routine NGT had:

  • Earlier return of bowel function (p<0.00001)
  • Fewer pulmonary complications (p=0.01)
  • No difference in anastomotic leak rates (p=0.70)
  • Trend toward shorter hospital stays 2

• Meta-analyses demonstrating no benefit for gastrointestinal or pulmonary complications, but increased patient discomfort and delayed return to oral diet 1

When NGT IS Indicated (Therapeutic Use)

Place an NGT only in these specific circumstances:

1. Active ileus - patient presenting with or developing postoperative bowel obstruction
2. Gross intestinal edema identified at the end of the surgical procedure
3. Gastric stasis with aspiration risk - particularly in patients with altered mental status or inability to protect airway
4. Severe PONV unresponsive to antiemetics - as a rescue intervention 3
5. Inability to extubate postoperatively - sedated/intubated patients requiring gastric decompression 4

Daily Reassessment Protocol

If an NGT is placed therapeutically, evaluate DAILY for removal 1. Remove as soon as:

• Patient is alert and protecting airway
• No signs of ongoing ileus or obstruction
• Tolerating small amounts of oral intake
• Gastric output is minimal

Why the Historical Practice Was Wrong

Historically, NGTs were placed to prevent nausea, vomiting, gastric distention, and anastomotic leakage. This rationale has been definitively disproven 1, 2. The evidence shows:

• No reduction in anastomotic leaks - the feared complication does not decrease with prophylactic NGT
• Increased complications - NGT placement itself can cause perforation of gastric conduits or anastomoses (3% complication rate in one series) 5
• Delayed recovery - routine NGT delays time to first oral intake by 1.6 days and time to full feeds by 1.5 days 6

Common Pitfalls to Avoid

1. "Just in case" placement - This outdated practice harms patients. If there's no specific indication, don't place it.

2. Leaving it in "until bowel sounds return" - Bowel sounds are not a reliable indicator. Focus on clinical signs of ileus (distention, inability to tolerate oral intake, high gastric residuals if NGT already present).

3. Placing NGT for PONV prevention - Use multimodal antiemetic prophylaxis instead (ondansetron, dexamethasone, scopolamine). Reserve NGT for severe refractory PONV only 3.

4. Forgetting to reassess daily - Many NGTs remain in place by inertia rather than indication. Daily rounds should include explicit evaluation of continued need.

Special Populations

Emergency surgery patients may have higher rates of ileus and physiologic derangement, but even in this population, the 2023 ERAS guidelines recommend selective rather than routine use 1. The key is individualized assessment of aspiration risk and gut dysfunction rather than blanket protocols.

Pancreaticoduodenectomy patients historically received routine NGT, but selective use reduces delayed gastric emptying (p=0.015), shortens length of stay (p<0.001), and accelerates time to dietary tolerance (p<0.001) 4.