Rectal Tubes: Indications, Insertion Technique & Safety

A rectal tube (flatus tube, rectal catheter) is a soft, flexible tube (silicone, PVC, rubber) with a rounded, fenestrated tip, inserted per rectum to decompress gas or stool.

Indications

• Acute constipation / fecal impaction (adjunct to enemas/manual disimpaction).
• Postoperative ileus / abdominal distension (gas decompression).
• Preoperative bowel prep (facilitate enema return).
• Palliative care – comfort for obstructing rectal cancer.
• Diagnostic – redirect effluent in fistula management.

Insertion Procedure (Adult)

1. Explain procedure; privacy; left lateral (Sims) position, knees flexed.
2. Lubricate tube tip (water-soluble gel).
3. Gently advance 10–15 cm (4–6 in) past anal sphincter.
4. Secure to thigh (tape); connect to drainage bag if prolonged.
5. Monitor: vital signs, abdominal distension, output, discomfort.
6. Remove when decompression achieved or per protocol (usually <30 min for gas).

Pediatric

• Shorter insertion (5–8 cm); smaller Fr (10–14 Fr vs 18–24 Fr adult).
• Parental presence, distraction, sucrose for neonates.

Risks & Contraindications

Risk	Mitigation
Rectal perforation	Gentle technique; avoid in recent rectal surgery, known stricture, coagulopathy.
Bleeding	Check platelets/INR; lubricate well.
Vagal response (bradycardia, hypotension)	Monitor vitals; atropine available.
Infection	Sterile/clean technique; single-use tubes.
Mucosal trauma	Rounded tip; limit duration.

Rectal tubes provide temporary relief; address underlying cause (constipation, obstruction, motility disorder).