The SHA test in vestibular diagnosis

Anatomic specificity of central vestibular signs in posterior fossa lesions

The reliability of central vestibular signs such as decruitment in signifying retrolabyrinthine lesions has been well established. This study was initiated to determine if this and other central vestibular signs, individually or collectively, indicate involvement of specific anatomic structures in the posterior fossa. Forty-six patients with morphologic lesions defined by computerized tomography (CT), pneumo-CT autopsy were studied. Oculomotor signs showed a statistically significant correlation with lesions of the archicerebellum. The other central vestibular signs did not show any correlation.

Harmonic acceleration tests as a measure of vestibular compensation

The material presented in excerpted from patient evaluations. The study was performed with the use of the Contraves rotary chair. This testing modality was used at each patient visit. All other conventional auditory and ENG tests were also performed. These patients have been selected to illustrate the value of the harmonic acceleration (HA) test as a modality for monitoring patient progress. The HA graphs produced were a result of the presence or absence of central vestibular compensation. The findings on these investigations further confirm that HA test provide an objective monitor for vestibular abnormality.