menu Contact Us Dizzy Patients Health Care Providers Research BPPV DVD Tai Chi DVD Understanding Dizziness Acknowledgements Disclaimer Quoting

Unilateral Vestibular Loss -- example case

 

This patient had an acoustic neuroma resected on the right side 30 years ago. They show findings typical of complete unilateral vestibular loss, accompanied by unilateral deafness.

This patient is very instructive. Caloric testing, vibration testing are very sensitive to unilateral loss. HSN is erratic. Rotatory chair testing just barely picks up unilateral loss. CDP testing can be close to normal in a person with bilateral loss.

audiogram
Complete deafness on the right side.
caloric
Complete vestibular loss on the right side.
VEMP
Absent VEMP on the right side (notice the large crossed response on the left though).

 

CDP
Nearly normal CDP, in spite of complete vestibular loss on the right side.
HSN
No head-shaking nystagmus is seen in spite of complete vestibular loss.
vibration
Powerful and enduring vibration induced nystagmus
VOR
Mildly low gain and increased phase at low frequency -- consistent with unilateral loss of vestibular function

 

 

step
Step responses suggesting no remaining velocity storage (consistent with sinusoidal testing).

 

 

Copyright August 3, 2016 , Timothy C. Hain, M.D. All rights reserved. Last saved on August 3, 2016