Calcium channel blocker-associated small bowel angioedema

Area of Science:

• Gastroenterology
• Pharmacology
• Internal Medicine

Background:

• Isolated angioedema of the small intestine is uncommon, typically linked to ACE inhibitors, ARBs, or C1 esterase inhibitor deficiency.
• This study investigates a rare case of small intestine angioedema attributed to calcium channel blockers (CCBs).

Observation:

• A 56-year-old woman experienced recurrent episodes of abdominal pain, nausea, vomiting, and diarrhea over two years.
• Extensive workup, including imaging and serological tests, was largely unremarkable, but CT scans revealed mural thickening in the ileum.
• Endoscopy showed edematous, violaceous duodenal folds and a markedly edematous, erythematous distal ileum.

Findings:

• The patient's symptoms resolved upon discontinuation of CCBs and recurred upon accidental reintroduction, establishing a causal link.
• Calcium channel blockers (CCBs) are identified as a potential cause of isolated intestinal angioedema.
• Distinctive endoscopic findings, including mural thickening and edematous, violaceous folds, are associated with CCB-induced angioedema.

Implications:

• This case highlights CCBs as a potential etiology for isolated intestinal angioedema, expanding the differential diagnosis.
• Discontinuation of the offending CCB is the primary diagnostic and therapeutic strategy.
• Recognizing these specific endoscopic findings can aid in the timely diagnosis and management of this rare condition.