Swallow Impairment in Parkinson's Disease: Revelations from High-Resolution Videomanometry

Area of Science:

• Neuroscience
• Gastroenterology
• Speech-Language Pathology

Background:

• Parkinson's disease (PD) is a neurodegenerative disorder affecting motor control.
• Dysphagia (swallowing difficulties) and dysphonia (voice disorders) are common symptoms in PD.
• Understanding upper esophageal sphincter (UES) function is crucial for managing these symptoms.

Purpose of the Study:

• To investigate upper esophageal sphincter (UES) function in Parkinson's disease (PD) patients.
• To evaluate the impact of vocal tests on UES function using high-resolution videomanometry (HRVM).
• To correlate videofluoroscopy swallow study (VFSS) and HRVM findings with PD severity.

Main Methods:

• Employed high-resolution videomanometry (HRVM) synchronized with acoustic recording.
• Assessed swallowing (5ml and 10ml) and vocal tasks in 20 PD patients and 10 healthy controls.
• Utilized videofluoroscopy swallow study (VFSS) for complementary analysis of laryngeal and UES kinematics.

Main Results:

• PD patients exhibited significantly reduced laryngeal elevation during swallowing.
• Higher intrabolus pressure and altered UES relaxation pressures were observed in PD patients.
• Vocal tests, particularly high-pitched phonations, influenced UES function and laryngeal movement in PD.

Conclusions:

• Early and moderate stage Parkinson's disease is associated with reduced UES compliance and subtle functional changes.
• HRVM is a valuable tool for assessing the interplay between phonation and deglutition in PD.
• Findings suggest potential targets for dysphagia and dysphonia rehabilitation in PD patients.