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Published on: August 30, 2019
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Romberg test: Differentiating vestibular from somatosensory ataxia
Sofia Mermelstein1,2, Lucia Joffily3,4, Toby J Ellmers5
1Department of Neurology, Pedro Ernesto University Hospital, Rio de Janeiro, Brazil. sofiamermelstein@gmail.com.
Summary
This study refined the Romberg Test (RT) using gyroscopic sway measurements to better distinguish vestibular from proprioceptive deficits. Differing sway patterns on firm versus foam surfaces proved key for diagnosis.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Clinical Neurology
Background:
- The traditional Romberg Test (RT) has limited diagnostic utility for vestibular dysfunction due to its nonspecific nature.
- Objective and detailed quantitative measures are needed to improve diagnostic accuracy beyond binary outcomes.
- Gyroscopic measurements of trunk sway offer enhanced insights into static balance and postural control.
Purpose of the Study:
- To evaluate if specific sway patterns and perceived instability during RT variants can differentiate individuals with vestibular deficits, proprioceptive deficits, and healthy controls (HC).
- To investigate the diagnostic potential of quantitative sway analysis and subjective instability scores in balance disorders.
Main Methods:
- Assessed 18 patients (unilateral vestibular loss, bilateral vestibular loss, sensory predominant peripheral neuropathy) and 6 HCs.
- Utilized gyroscopic trunk sway measurements, time to fall, and Subjective Instability (SI) scores during eight stance tasks.
- Performed clinical history, physical examinations, and relevant ancillary vestibular and nerve conduction tests.
Main Results:
- Vestibulopathy patients exhibited significantly greater trunk sway with eyes closed on foam compared to neuropathy patients.
- Sensory predominant peripheral neuropathy patients showed greater imbalance on firm ground (eyes closed) and a larger discrepancy between objective and subjective instability.
- Tandem stance tasks provided less group differentiation; no correlation was found between fall direction and VOR hypofunction side.
Conclusions:
- Differing sway patterns on firm versus foam surfaces are the primary distinguishing feature between vestibular and somatosensory ataxia.
- Quantitative sway analysis during modified Romberg Test tasks enhances diagnostic capabilities for balance disorders.
- Objective and subjective measures provide a more nuanced understanding of postural control deficits in neurological conditions.
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