Does Inferior Oblique Muscle Overaction Affect Ocular Vestibular Evoked Myogenic Potentials?

İsmail Demir; Muhammed Zeki Yalcin; Deniz Uğur Cengiz; Şükrü Aydın; Cem Çankaya; Ahmet Mahmut Tekin

doi:10.58600/eurjther.20232902-451.y

Authors

İsmail Demir Department of Otorhinolaryngology, Inonu University, Turgut Özal Medical Center, Malatya, Turkey https://orcid.org/0000-0002-4362-795X
Muhammed Zeki Yalcin Department of Otolaryngology, Sungurlu State Hospital, Corum, Turkey https://orcid.org/0000-0002-4943-4577
Deniz Uğur Cengiz Department of Audiology, Inonu University, Faculty of Health Sciences, Malatya, Turkey https://orcid.org/0000-0001-9002-6818
Şükrü Aydın Department of Otorhinolaryngology, Inonu University, Turgut Özal Medical Center, Malatya, Turkey https://orcid.org/0000-0003-1105-3338
Cem Çankaya Department of Ophtalmology, Inonu University, Turgut Özal Medical Center, Malatya, Turkey https://orcid.org/0000-0002-7716-0438
Ahmet Mahmut Tekin Department of Otolaryngology and Head & Neck Surgery, Vrije Universiteit Brussel, University Hospital UZ Brussel, Brussel Health Campus, Belgium https://orcid.org/0000-0003-1604-3382

DOI:

https://doi.org/10.58600/eurjther.20232902-451.y

Keywords:

o-Vemp, strabismus, inferior oblique muscle hyperfunction, balance, vertigo

Abstract

Objectives: Inferior oblique muscle overaction (IOOA) is a common ocular motility disorder. Ocular Vestibular Evoked Myogenic Potentials (oVEMP) are tests that evaluate the reflex pathway between the utricular macula and the inferior oblique muscle to detect vestibular diseases. Our study is of great importance as it is the first study in the literature to evaluate the effect of inferior oblique muscle overaction on oVEMP parameters.

Methods: Thirty-five patients with unilateral inferior oblique muscle overaction (IOOA group) and 18 healthy volunteers without any neurological or vestibulocochlear disease were included in this study. All patients and healthy volunteers were evaluated with oVEMP.

Results: No statistically significant difference was found between the n1 latency, p1 latency, n1-p1 latency measurement values of the participants included in the study (p>0,05). A statistically significant difference was found between the n1-p1 amplitude measurement values of the participants in patient groups (non-squint eyes, squint eyes) and control groups (p-value was 0.038).

Conclusion: In IOOA patients, vestibulo-ocular reflex pathway may be affected, vestibular symptoms may develop thus o-VEMP responses may be affected. A careful anamnesis should be taken in IOOA patients, and it should be kept in mind that n1-p1 amplitudes and asymmetries may be significantly higher when o-VEMP is performed

Keywords: o-VEMP, Strabismus, Inferior oblique muscle overaction, Balance, Vertigo

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