Bowel Sounds 

1. Introduction to Bowel Sounds 

Bowel sounds are noises made by the movement of the intestines as they propel contents through peristalsis. Assessment of bowel sounds is a key part of the abdominal exam and postoperative care because it provides clues about gastrointestinal function and complications. 

Key points: 

Normal bowel sounds: clicking or gurgling every 5–15 seconds. 
Hypoactive: infrequent, soft, may indicate ileus or postoperative slowing. 
Hyperactive: loud, frequent, may suggest early obstruction or diarrhoea. 
Absent: no sounds for ≥2 minutes in each quadrant may indicate paralytic ileus or peritonitis (requires urgent assessment). 

Technique (for students and nurses): 

Use a stethoscope diaphragm. 
Patient lying supine, relaxed. 
Listen to all four quadrants for at least 1 minute per quadrant. 
Note frequency, character, and pitch. 

2. Bowel Sounds in Postoperative Patients 

Surgery can affect bowel motility depending on site, type, and extent of operation. 

General Postoperative Considerations 

Ileus: Most common after abdominal surgery. Typically lasts 24–72 hours. 

Return of bowel function is assessed by: 

Bowel sounds 
Passing flatus 
Bowel movement 

3. Specific Surgical Procedures 

A. Hartmann’s Procedure 

Definition: Resection of the rectosigmoid colon with formation of an end colostomy and closure of the distal rectal stump. 

Impact on bowel sounds: 

Initially, bowel sounds may be absent or hypoactive due to general anaesthesia and manipulation. 
Ileus is common for 2–3 days. 
Return of bowel sounds often starts in the small bowel (upper abdomen) before the colon. 

Assessment tips: 
Listen in all quadrants; the stoma may produce audible gurgling if functioning. 
Monitor for high-pitched, tinkling sounds, which may indicate obstruction. 

B. Oesophagectomy 

Definition: Surgical removal of part or all of the oesophagus, often with gastric pull-up. 
Impact on bowel sounds: 
Primarily affects upper GI motility and swallowing. 

Bowel sounds may be slow to return due to: 

Extensive surgery 
Use of opioids 
Altered autonomic function 

Assessment tips: 

Focus on small bowel sounds (upper quadrants). 
Absence of bowel sounds for >24–48 hours may indicate postoperative ileus. 
Early feeding is often delayed until bowel sounds return or confirmed by clinical signs. 

C. Colectomy 

Definition: Resection of part or all of the colon. 

Impact on bowel sounds: 

Small bowel resumes activity first, often within 12–24 hours. 
Colon may take 2–5 days to regain function. 
Postoperative ileus is common, especially after extensive colectomy. 

Assessment tips: 

Listen quadrant by quadrant, starting away from surgical site. 
Watch for gradual progression of sounds from high-pitched (early) to normal. 

4. Documentation & Communication 

When assessing bowel sounds, document: 

Quadrant (e.g., RLQ, LUQ) 
Character: normal, hypoactive, hyperactive, absent 
Duration of absence if relevant 
Any additional findings: stoma activity, abdominal distension, tenderness 

Clinical significance: 

Persistent absent bowel sounds → notify surgical team 
Hyperactive bowel sounds with vomiting → assess for obstruction 
Audible stoma output → indicates colostomy is functioning 

5. Teaching Points for Students & Nurses 

Palpation & auscultation order matters: auscultate before palpation to avoid altering bowel sounds. 
Postoperative changes are normal, but trends are important. 
Compare quadrants; some may be hypoactive while others are active. 
Integrate with other signs: nausea, vomiting, abdominal distension, flatus, stool. 

6. Quick Reference