Bittar RSM, Mezzalira R, Ramos ACM, Risso GH, Real DM, Grasel SS. Vestibular recruitment: new application for an old concept.
Braz J Otorhinolaryngol 2021;
88 Suppl 1:S91-S96. [PMID:
34016567 PMCID:
PMC9734265 DOI:
10.1016/j.bjorl.2021.04.006]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 04/06/2021] [Accepted: 04/11/2021] [Indexed: 12/16/2022] Open
Abstract
INTRODUCTION
Vestibular recruitment is a sign of hyperexcitability of central vestibular neurons and may be characteristic of peripheral vestibular damage.
OBJECTIVE
To define the post-caloric recruitment index and its ability to predict the stage of vestibular compensation and peripheral lesion.
METHODS
First of all, we demonstrated that larger values in the cold post-caloric stimulation compared to warm stimulation were equivalent to vestibular recruitment observed during the sinusoidal harmonic acceleration test. In the next step, patients with vestibular complaints and asymptomatic controls were submitted to the caloric test. We calculated post-caloric recruitment index for the control group. Among the study group, we analyzed the relation between post-caloric recruitment and unilateral weakness as well as the types of vestibular diagnoses.
RESULTS
Mean post-caloric recruitment was 17.06% and 33.37% among the control and study group, respectively. The ratio between post-caloric recruitment and unilateral weakness was 1.3 in the study group. Among recruiting subjects, no significant difference of unilateral weakness from the lesioned or healthy side was observed. We found no differences in vestibular diagnoses between recruiting and non-recruiting subjects.
CONCLUSION
Post-caloric recruitment index identified asymmetric vestibular tonus and central compensation. The normal value was established at 17.06%.
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