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Abstract
He purpose of this study was to investigate the correlation of Galvanic Vestibular Stimulation (GVS) evoked response and balance measurements in hemiparetic patients with disequilibrium.
Subjects: Fourty Subjects from both sexes with age ranged from 40 to 60 years old were participated in this study. They were assigned into two groups; the study group consisted of twenty hemiparetic patients with mean age of (50.35±12) years, mean height of (169±0.47) cm, mean weight of (80.2±0.55)kg and mean duration of illness (13.55±0.83) months, while the control group consisted of twenty normal subjects with mean age of (50.5± 1.14) years, mean height of (169.4±0.662)cm, and mean weight of (78.85±.59) kg.
Methods: Changes in H-reflex amplitude and latency following galvanic vestibular stimulation was measured and then correlated with the balance system scores using the Biodex stability system [stability index (static balance) & dynamic limit of stability].
Results: The results of the current study revealed highly significant differences between the two groups in the amplitude of the conditioned H-reflex compared with that of the test H-reflex (P = 0.0001). Conversely, the difference between the two groups in latency was numerical rather than statistical. The percentage of change in H-reflex amplitude of the control group was statistically higher than that of the study group (P < 0.0001). However, the difference between the two groups in the percentage of change in H-reflex latency was non significant. On the other hand there was a highly significant direct proportional correlation between the percentage of change in H-reflex amplitude and the dynamic limit of stability in the study group (P = 0.0001).
Discussion and Conclusion: The finding revealed that the ”disturbed balance” after stroke might be related to an impairment of the corticovestibular modulation of the vestibular function. The results of the present study suggested that GVS-evoked response could provide a unique and valuable diagnostic information regarding the vestibular function after stroke.