Dysphagia and Dysphonia in Parkinson's Disease: Pathophysiological Mechanisms, Treatment Approaches, and Clinical Implications.

Abstract

Background: Parkinson's disease (PD) is a progressive neurodegenerative disorder characterized by the degeneration of dopamine-producing neurons, leading to a wide range of symptoms that significantly impact patients' quality of life. Among these, dysphagia (difficulty swallowing) and dysphonia (voice impairments) are particularly prevalent, affecting a majority of individuals with PD and contributing to serious health risks and social challenges.

Summary: Dysphagia affects up to 80% of individuals with PD, posing risks such as aspiration pneumonia, malnutrition, and dehydration. These clinical manifestations can lead to increased morbidity and mortality, making early detection and intervention essential. Current treatment approaches for dysphagia include compensatory strategies, such as posture adjustments, swallowing exercises, and dietary modifications, as well as pharmacological interventions. However, given the progressive nature of PD, individualized treatment plans are necessary to effectively manage symptoms and prevent life-threatening clinical manifestations. Similarly, dysphonia affects approximately 70-90% of PD patients and results in vocal impairments, including reduced volume, breathy or hoarse speech, and monotone voice, which hinder communication and contribute to social isolation. The loss of vocal strength and clarity can lead to frustration, withdrawal from conversations, and diminished overall well-being. The Lee Silverman Voice Treatment (LSVT) has emerged as one of the most effective therapeutic interventions for dysphonia, aiming to improve vocal loudness and clarity. While LSVT has shown promising results, research on dysphonia remains less extensive than dysphagia, indicating a need for further investigation into optimized treatment strategies.

Key messages: Given the profound impact of both dysphagia and dysphonia, a multidisciplinary approach integrating speech-language therapy, medical interventions, and tailored rehabilitation programs is crucial. Addressing these symptoms proactively can help improve communication, reduce health risks, and ultimately enhance the overall quality of life for individuals living with PD.