CT Scan Reliability in Detecting Internal Hernia after Gastric Bypass

Area of Science:

• Bariatric Surgery
• Gastrointestinal Surgery
• Surgical Complications

Background:

• Internal hernia (IH) is a dangerous complication following gastric bypass surgery.
• Symptoms include abdominal pain, nausea, and vomiting, often presenting as acute or relapsing obstruction.
• Early diagnosis and surgical exploration are crucial for reducing morbidity and mortality.

Purpose of the Study:

• To evaluate the sensitivity and specificity of computed tomography (CT) in identifying internal hernias (IH) post-gastric bypass.
• To assess the diagnostic accuracy of CT scans in patients presenting with signs of small bowel obstruction (SBO) after LRYGB.

Main Methods:

• Retrospective review of 550 laparoscopic Roux-en-Y gastric bypass (LRYGB) patient records from 2010-2014.
• Study included patients with obstruction symptoms who underwent CT imaging and subsequent laparoscopic exploration.
• Analysis focused on CT findings compared to operative results for IH detection.

Main Results:

• CT identified obstruction in 34 patients; only 6 (17.7%) were diagnosed with IH preoperatively.
• CT demonstrated a sensitivity of 28.6% and a specificity of 90.0% for IH detection.
• Other SBO causes included adhesions (17), IH (14), jejunojejunostomy stenosis (2), and phytobezoar (1).

Conclusions:

• Internal hernia (IH) after LRYGB is challenging to diagnose using CT imaging.
• CT scans exhibit low sensitivity but high specificity for detecting IH.
• Laparoscopic exploration is the definitive diagnostic and therapeutic intervention for suspected IH post-gastric bypass.