Case 15 · foundation
Bouncing vision while walking after IV antibiotics
Vignette
A 60-year-old man finished a 4-week course of intravenous gentamicin two months ago for endocarditis. He now reports that signs at the railway station 'bounce' as he walks, and he cannot read his phone in a moving car. He has no rotational vertigo. Examination: head impulse test is positive in both directions with bilateral corrective saccades. Bucket SVV is 0.0° with a normal SD. Caloric responses are bilaterally absent.
SVV trace
Symmetrically absent input gives a normal SVV