Lower esophageal sphincter analysis using computerized manometry in patients with chagasic megaesophagus

Area of Science:

• Gastroenterology
• Medical Imaging
• Physiology

Background:

• Computerized axial manometry (CAM) provides 3D pressure imaging of the lower esophageal sphincter (LES).
• CAM is superior to standard manometry for assessing LES function in gastroesophageal reflux disease and idiopathic achalasia.
• Controversy exists regarding LES pressure in Chagas' disease, despite clinical similarities to idiopathic achalasia.

Purpose of the Study:

• To analyze esophageal motor disorders in Chagas' megaesophagus using CAM.
• To investigate the characteristics of the lower esophageal sphincter in patients with Chagas' megaesophagus.

Main Methods:

• Prospective study of 20 patients with Chagas' megaesophagus.
• Utilized a low-complacency perfusion system and an 8-channel manometry probe with radial channels for 3D LES imaging.
• Employed the continuous pull-through technique for probe traction.

Main Results:

• Patients with Chagas' megaesophagus exhibited significantly elevated LES pressure, length, asymmetry, and vector volumes compared to normal volunteers (P < 0.05).
• Aperistalsis of esophageal body waves was observed in all patients.
• Reduced contraction amplitude in the esophageal body was noted compared to normal patients.

Conclusions:

• Patients with Chagas' megaesophagus demonstrate a hypertonic lower esophageal sphincter.
• Esophageal aperistalsis is a characteristic finding in Chagas' megaesophagus.
• CAM provides valuable insights into esophageal motor disorders in Chagas' disease.