Comparison of electronystagmography results with dynamic posturography findings in patients with vestibular schwannoma

Conclusion. Condition-5-score (C5S) and condition-6-score (C6S) of computerized dynamic platform posturography (CDPP) can detect the presence of a functional deficit of the lateral semicircular canal (and the superior vestibular nerve), irrespective of the central vestibular compensatory status, in vestibular schwannoma (VS) patients. Objectives. To test whether CDPP findings differ between VS patients with and without asymmetry on caloric and/or rotational ENG studies. Patients and methods. This was a retrospective review of 216 consecutive patients with VS. C5S and C6S of CDPP (Equitest((R))) were compared among patients with normal caloric and rotational studies, patients with asymmetry on caloric studies and normal rotational studies, and patients with asymmetric caloric and rotational studies using the Wilcoxon-Mann-Whitney test. Results. C5S and C6S of VS patients with normal caloric and rotational studies were significantly higher than in VS patients with either asymmetry on both rotational and caloric test results (p < 0.001 for both C5S and C6S) or normal rotational studies and asymmetry on caloric testing (p <0.001 for both C5S and C6S). Neither C5S nor C6S were significantly different between patients with asymmetry on caloric testing and normal rotational studies and patients with asymmetry on both rotational and caloric testing.