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Vestibular function and vasopressin.

A Horii¹, T Kitahara, A Uno

¹Department of Otolaryngology, Osaka University Medical School, Suita, Osaka, Japan. ahorii@ent.med.osaka-u.ac.jp

Acta Oto-Laryngologica. Supplementum

|July 28, 2004

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Vestibular stimulation increases vasopressin (AVP) levels in rats. Treatments for Ménière

Area of Science:

Neuroscience
Endocrinology

Background:

The vestibular system plays a crucial role in balance and spatial orientation.
Vasopressin (AVP) is a hormone involved in regulating blood pressure and fluid balance.
Dysregulation of AVP has been implicated in various physiological and pathological conditions.

Purpose of the Study:

To elucidate the relationship between vestibular system activity and plasma vasopressin (AVP) levels.
To investigate the impact of vestibular stimulation and inhibition on AVP concentrations.

Main Methods:

Examined the effects of electrical and caloric vestibular stimulation on plasma AVP in anesthetized rats.
Measured plasma AVP levels in patients with Ménière's disease before and after endolymphatic drainage and steroid instillation surgery (EDSS) or intratympanic gentamicin (GM) injection.

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Main Results:

Electrical vestibular stimulation dose-dependently increased plasma AVP levels in rats.
Caloric stimulation with cold water also elevated plasma AVP levels.
EDSS and intratympanic GM injection led to a rapid and sustained decrease in plasma AVP levels in patients.

Conclusions:

Vestibular system activation or inhibition influences plasma AVP levels.
Vestibular disorders may increase AVP, potentially exacerbating endolymphatic hydrops.
EDSS and intratympanic GM injection effectively reduce AVP levels, likely by mitigating stress responses and inhibiting hydrops formation, thereby preventing vertigo spells.