Spectral Composition of Body Sway in Persistent Postural-Perceptual Dizziness
| Autor: | Evangelia Kararizou, Athena Zachou, Evangelos Anagnostou, Georgia Stavropoulou |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
medicine.medical_specialty
business.industry Middle frequency Persistent postural perceptual dizziness Audiology Dizziness Sensory Systems Standard deviation Body sway Cross-Sectional Studies Otorhinolaryngology Frequency domain Vertigo medicine Humans Prospective Studies Neurology (clinical) business Prospective cohort study Postural Balance Physical Therapy Modalities Spectral composition Balance (ability) |
| Zdroj: | Otology & Neurotology. 42:e1318-e1326 |
| ISSN: | 1537-4505 1531-7129 |
| DOI: | 10.1097/mao.0000000000003252 |
| Popis: | OBJECTIVE Previous studies in phobic postural vertigo patients showed characteristic frequency changes in body sway fluctuations, raising the question whether similar spectral changes can be also observed in the recently defined syndrome of persistent postural-perceptual dizziness (PPPD). STUDY DESIGN Cross-sectional prospective study. SETTING Tertiary referral center. SUBJECTS Sixty-one PPPD patients and 41 healthy controls. INTERVENTIONS Static balance was assessed while standing on firm surface with eyes open or closed (conditions 1 and 2) and while standing on foam with eyes open or closed (conditions 3 and 4). Postural sway was analyzed by means of time (sway area and standard deviation) and frequency domain metrics. The latter was based on comparisons of the percentage of energy in each of three frequency bands: low (0-0.5 Hz), middle (0.05-2 Hz), and high frequency (2-20 Hz). MAIN OUTCOME MEASURE Stabilometric time and frequency domain parameters. RESULTS Time domain metrics deteriorated significantly from conditions 1 through condition 4 in patients and controls. Spectral changes, however, were more abundant in PPPD subjects than in controls. Patients showed increased low frequency, but decreased high frequency spectral power in condition 3 as compared to condition 2. Dizziness Handicap Inventory score was positively correlated with middle frequency and negatively correlated with low frequency fluctuations. CONCLUSIONS We conclude that PPPD patients exhibit a time domain sway pattern in different conditions which is grossly similar to that of controls. However, sensory feedback conditions with equal sway area show unique differences in their spectral content in PPPD patients. Moreover, perceived severity of dizziness is associated with greater body oscillations in the middle frequency band. |
| Databáze: | OpenAIRE |
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