Unilateral vestibulotoxicity due to systemic gentamicin therapy

Area of Science:

• Ototoxic effects of antibiotics
• Neuroscience
• Vestibular system disorders

Background:

• Systemic gentamicin is known to cause bilateral vestibular dysfunction.
• Symptoms include chronic vestibular insufficiency, such as ataxia and oscillopsia.
• Vertigo is a common symptom associated with vestibular loss.

Purpose of the Study:

• To investigate cases of vestibular dysfunction following gentamicin exposure.
• To explore the mechanisms behind the absence of vertigo in affected patients.
• To understand the presentation of gentamicin-induced vestibular injury.

Main Methods:

• Case report of 6 patients with ataxia and oscillopsia.
• Caloric testing to assess vestibular function.
• Analysis of patient history for vertigo and gentamicin exposure.

Main Results:

• All 6 patients presented with ataxia and oscillopsia.
• No history of vertigo was reported in these patients.
• Caloric testing revealed severe unilateral loss of vestibular function.

Conclusions:

• The absence of vertigo may indicate subacute unilateral vestibular loss allowing for compensation.
• Alternatively, asymmetrical recovery following bilateral vestibular loss is a possible explanation.
• Vestibular hair cell regeneration after aminoglycoside damage may contribute to asymmetrical recovery.