Visible peristaltic waves occur when intestinal contractions become strong and frequent, usually in response to obstruction. These waves may roll across the abdomen and are often sudden and transient as the intestine attempts to overcome the blockage. They are best observed with the patient in a supine position, while stooping at the patient’s side.

In thin or malnourished patients with abdominal muscle atrophy, visible peristaltic waves may reflect normal gastrointestinal contractions.

History and Physical Examination

After observing peristaltic waves, collect a detailed history:

• Ask about a history of pyloric ulcer, stomach cancer, chronic gastritis, or other conditions that can cause pyloric obstruction.

• Explore potential causes of intestinal obstruction, such as intestinal tumors or polyps, gallstones, chronic constipation, or hernias.

• Obtain history of recent abdominal surgery and drug use.

Determine associated symptoms:

• Spasmodic abdominal pain (small-bowel obstruction) or colicky pain (pyloric obstruction).

• Nausea and vomiting: ask about amount, color, and content (undigested food, bile, fecal matter).

• Appetite and weight changes.

Physical examination:

• Inspect abdomen in supine position for distention, surgical scars, adhesions, or visible bowel loops.

• Auscultate for hyperactive, high-pitched bowel sounds.

• Jar the patient’s bed or roll him side to side to detect succussion splash (indicative of pyloric obstruction).

• Palpate for rigidity and tenderness.

• Percuss for tympany.

• Check skin and mucous membranes for dryness and poor turgor, indicating dehydration.

• Take vital signs, noting tachycardia and hypotension, which suggest hypovolemia.

Medical causes

Special considerations

• Visible peristaltic waves are an early sign of intestinal obstruction; monitor patient closely.

• Withhold food and fluids until diagnosis is confirmed.

• Prepare for abdominal X-rays or barium studies.

• If obstruction is confirmed, nasogastric suction may be required.

• Monitor hydration status, vital signs, and intake/output.

• Maintain oral hygiene for patients with nasogastric tubes.

Patient counseling

• Discuss dietary and fluid management.

• Encourage stool softeners and increased intake of high-fiber foods for chronic constipation.

• Explain the need for diagnostic tests and possible interventions.

Pediatric pointers

• In infants, visible peristaltic waves may indicate pyloric stenosis.

• In small children, waves may be normal or suggest congenital anomalies, volvulus, or swallowed foreign body.

Geriatric pointers

• Always check for fecal impaction in elderly patients presenting with visible waves.

• Review drug history, as antidepressants and antipsychotics may predispose to constipation and obstruction.

References

1. Buttaro, T. M., Tybulski, J., Bailey, P. P., & Sandberg-Cook, J. (2008). Primary care: A collaborative practice (pp. 444–447). St. Louis, MO: Mosby Elsevier.

2. Colyar, M. R. (2003). Well-child assessment for primary care providers. Philadelphia, PA: F.A. Davis.

3. McCance, K. L., Huether, S. E., Brashers, V. L., & Rote, N. S. (2010). Pathophysiology: The biologic basis for disease in adults and children. Maryland Heights, MO: Mosby Elsevier.

4. Sommers, M. S., & Brunner, L. S. (2012). Pocket diseases. Philadelphia, PA: F.A. Davis.