Abdominal Distention Assessment and Management

Diagnostic Approach

The American Gastroenterological Association recommends using Rome IV criteria to diagnose primary abdominal bloating and distention, which provides standardized diagnostic parameters 3
Differentiate between true abdominal distention (objective increase in abdominal girth) and bloating (subjective sensation of abdominal fullness) 1
Perform a digital rectal examination to identify potential pelvic floor disorders, which frequently present with bloating and distention 4
Assess for APD, which is characterized by paradoxical diaphragmatic contraction (downward movement) and relaxation of anterior abdominal wall muscles 1
Reserve abdominal imaging and upper endoscopy for patients with alarm features, recent worsening symptoms, or abnormal physical examination findings 2
Consider anorectal physiology testing combined with balloon expulsion in patients with suspected pelvic floor disorders 5
Avoid routine gastric emptying studies for isolated bloating and distention; only consider if nausea and vomiting are present 4
Rule out carbohydrate enzyme deficiencies with dietary restriction and/or breath testing 6

Avoid attributing all abdominal distention to gas accumulation, as studies show that even small increases in intraluminal gas (approximately 10%) can trigger significant distention in patients with APD 1
Do not routinely order probiotics for abdominal bloating and distention, as evidence does not support their efficacy 7
Recognize that patients with severe intestinal dysmotility (e.g., intestinal pseudo-obstruction) may present with similar symptoms but without the APD pattern 1
Be aware that bloating and abdominal fullness can be presenting symptoms in women with ovarian cancer, particularly those 50 years or older 5

For confirmed APD, consider diaphragmatic breathing techniques which reduce vagal tone and sympathetic activity 8
For distention associated with constipation, consider medications used to treat constipation 2
Central neuromodulators (e.g., antidepressants) may be effective for treating distention by reducing visceral hypersensitivity 2
When dietary modifications are needed, involve a gastroenterology dietitian to monitor treatment 6