PPPD and Reliance on Visual Cues: A Study Review
In a recent article review at Vestibular Disorders Association, or VeDA, Dr. Danielle Beatty, PT, explored the article’s connection between persistent postural-perceptual dizziness (PPPD) and an over-reliance on visual cues for balance. The article she reviewed by Ichijo et al., 2024, investigated postural sway in PPPD patients compared to healthy individuals.
PPPD: An Overview
PPPD is characterized by chronic dizziness, unsteadiness, or a floating sensation, often triggered by conditions that affect balance. Individuals with PPPD frequently experience heightened symptoms when standing or moving, and visual stimuli can exacerbate their dizziness.
The Role of Visual Cues in Balance
The brain relies on a complex interplay of visual, vestibular (inner ear), and somatosensory (touch) information to maintain balance and spatial orientation. When one of these systems is impaired, the brain may compensate by relying more heavily on the remaining systems. The study hypothesized that individuals with PPPD may have increased reliance on visual cues due to potential vestibular or somatosensory systems disruptions.
Study Methodology
The study involved 53 PPPD patients and 53 age- and sex-matched healthy controls. The PPPD patients underwent various tests to assess their vestibular function, including otolith function tests, video head impulse tests (vHIT), and cervical and ocular vestibular evoked myogenic potentials (VEMPs).
Postural sway was measured using foam posturography and the mCTSIB protocol, which evaluates balance under four different conditions:
Fixed/Open: Eyes open, standing on a hard surface.
Fixed/Closed: Eyes closed, standing on a hard surface.
Foam/Open: Eyes open, standing on a foam mat.
Foam/Closed: Eyes closed, standing on a foam mat.
Key Findings
The study's significant findings revealed that PPPD patients exhibited significantly higher sway velocity and area compared to healthy controls in most conditions, particularly when visual cues were limited (eyes closed or standing on foam). This suggests a greater dependence on visual input for balance in individuals with PPPD, a crucial insight for healthcare professionals and researchers in the field of vestibular rehabilitation and balance disorders.
Furthermore, PPPD patients demonstrated a decreased reliance on somatosensory cues (information from the feet) compared to healthy controls, indicating potential challenges in integrating sensory information from multiple systems. This understanding can foster empathy and a deeper connection with the patients among healthcare professionals and researchers.
Implications for Rehabilitation
These findings underscore the importance of addressing visual dependence and enhancing somatosensory integration in the rehabilitation of individuals with PPPD. Physical therapy interventions may focus on the following:
Vestibular rehabilitation: Improving balance and gaze stability through exercises that challenge the vestibular system
Sensory reweighting: Training the brain to rely less on visual cues and more on somatosensory and vestibular information
Balance training: Enhancing overall balance and coordination through targeted exercises
Conclusion
This study highlights the complex interplay of sensory systems in PPPD and emphasizes the role of visual dependence in postural instability. By understanding these factors, physical therapists can develop more effective rehabilitation strategies to help individuals with PPPD regain balance and improve their quality of life.
References
Beatty, D. (2024). https://vestibular.org/blog/analysis-of-postural-stability-using-foam-posturography-in-patients-with-pppd/
Ichijo, Kentaro et al. 'Analysis of Postural Stability Using Foam Posturography in Patients with Persistent Postural-perceptual Dizziness'. 1 Jan. 2024 : 133 – 144.
Disclaimer: This Substack post is based on a review article by Danielle Beatty, DPT, and summarizes the findings of a study by Ichijo et al. It is intended for informational purposes only and should not be considered a substitute for professional medical advice. Please consult a qualified healthcare provider for personalized PPPD guidance or balance-related concerns.