Ineffective oesophageal motility: manometric subsets exhibit different symptom profiles

Area of Science:

• Gastroenterology
• Esophageal Physiology
• Clinical Diagnostics

Background:

• Ineffective esophageal motility (IOM) is diagnosed when > or = 30% of wet swallows show distal contractile amplitude < 30 mmHg.
• Subtyping IOM based on manometric patterns may reveal distinct clinical features and pathophysiological mechanisms.
• Understanding these differences is crucial for accurate diagnosis and targeted treatment of esophageal motility disorders.

Purpose of the Study:

• To compare demographic and clinical features across different manometric subsets of ineffective esophageal motility (IOM).
• To investigate whether the prevalence of gastro-oesophageal reflux differs among IOM manometric subsets.
• To explore potential variations in underlying pathophysiological mechanisms within IOM.

Main Methods:

• A cohort of 100 IOM patients was classified into manometric subsets: low-amplitude simultaneous contractions (LASC), low-amplitude propagated contractions (LAP), and non-transmitted sequences (NT).
• Demographic data, clinical symptoms (heartburn, dysphagia, chest pain), and manometric findings were collected.
• Ambulatory 24-hour pH monitoring was used to assess gastro-oesophageal reflux (GER) and acid exposure time (AET).
• IOM subsets were compared to each other and to 100 age- and gender-matched controls with esophageal symptoms but normal manometry.

Main Results:

• Patients with LASC reported significantly less heartburn (26%) but more dysphagia (57%) compared to LAP patients (heartburn 70%, dysphagia 24%; P <= 0.01).
• LASC patients also showed less heartburn (26% vs 68%) and more dysphagia (57% vs 11%) than patient controls (P < 0.001).
• The non-transmitted (NT) subset had heartburn prevalence of 54% and dysphagia of 36% compared to LASC and controls.
• No significant differences were found in age, gender, chest pain, AET, or symptom/reflux association between IOM subsets or controls.

Conclusions:

• Ineffective esophageal motility (IOM) patients with LASC demonstrate a distinct symptom profile compared to those with LAP, characterized by increased dysphagia and reduced heartburn.
• Despite differing symptom profiles, the prevalence of gastro-oesophageal reflux does not vary significantly between LASC and LAP subsets.
• These findings suggest potentially distinct pathophysiological mechanisms underlying different IOM manometric subsets, necessitating further research.