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Esophageal motor function in patients with myotonic dystrophy
M Costantini1, G Zaninotto, M Anselmino
1Department of Surgery, University of Padua, Italy.
Digestive Diseases and Sciences
|October 1, 1996
Summary
Myotonic dystrophy (MD) impairs pharyngeal and esophageal motor function, affecting swallowing and increasing reflux risk. Compensatory mechanisms exist, but dysphagia links to pharyngeal manometry findings.
Area of Science:
- Gastroenterology
- Neuromuscular Disorders
Background:
- Myotonic dystrophy (MD) is a multisystem disorder with potential effects on swallowing and esophageal function.
- Understanding the specific pharyngeal and esophageal motor deficits in MD is crucial for managing patient symptoms.
Purpose of the Study:
- To investigate pharyngeal and esophageal motor function in myotonic dystrophy (MD) patients.
- To determine the relationship between these motor functions and the presence of esophageal symptoms, particularly dysphagia.
Main Methods:
- Utilized low-compliance, high-fidelity esophageal manometry and videofluorography.
- Evaluated a cohort of 14 consecutive myotonic dystrophy patients.
Main Results:
- Observed a consistent motor pattern in MD patients: reduced resting tone in upper and lower esophageal sphincters, and decreased pharyngeal and esophageal contraction pressures.
- Radiology revealed hypotonic pharynx with stasis and hypo- or amotile, dilated esophagus.
- Dysphagia correlated specifically with pharyngeal manometry impairment, suggesting compensatory mechanisms for esophageal dysfunction.
Conclusions:
- Myotonic dystrophy affects both the striated (proximal) and smooth muscle (distal) portions of the esophagus.
- Impairment of the lower esophageal sphincter (LES) resting tone and competence increases the risk of gastroesophageal reflux disease (GERD) in MD patients.
- Pharyngeal motor impairment is the primary manometric correlate of dysphagia in MD.