Positional vertigo — but the maneuver isn't working
A 67-year-old man presents for a third opinion. Three weeks of brief positional vertigo provoked by rolling in bed, particularly toward the right. A previous clinician diagnosed posterior-canal BPPV and performed two right-sided Epley maneuvers without benefit. He is frustrated and asks if there is something more serious going on.
A 67-year-old man presents for a third opinion. Three weeks of brief positional vertigo provoked by rolling in bed, particularly toward the right. A previous clinician diagnosed posterior-canal BPPV and performed two right-sided Epley maneuvers without benefit. He is frustrated and asks if there is something more serious going on.
Dix-Hallpike to the right: no nystagmus. Dix-Hallpike to the left: no nystagmus. You proceed to the supine roll test. With the head turned 90° to the right (right ear down), a horizontal nystagmus appears beating to the LEFT (apogeotropic) of moderate intensity, lasting ~50 seconds. With the head turned 90° to the left (left ear down), a similar horizontal nystagmus appears beating to the RIGHT (apogeotropic) — but is more intense.
"Horizontal nystagmus beats AWAY from the ground (apogeotropic) on supine roll. WEAKER side identifies the affected ear."
Which canal and which mechanism does this pattern indicate?
What is the most appropriate treatment maneuver?
Right horizontal canal BPPV — apogeotropic (cupulolithiasis) variant
- 1.Horizontal-canal BPPV is ~10-15% of BPPV cases. Posterior-canal BPPV is much more common, which is why so many clinicians first reach for Epley.
- 2.Geotropic (canalithiasis) vs apogeotropic (cupulolithiasis) determines the maneuver: the geotropic variant resolves with a barbecue roll AWAY from the affected ear; the apogeotropic variant requires first converting cupulolithiasis to canalithiasis (Gufoni or Appiani maneuver) then a barbecue roll.
- 3.Identifying the affected side in horizontal-canal BPPV: in geotropic, the STRONGER side is the AFFECTED side; in apogeotropic, the WEAKER (less intense) side is the affected side.
- 4.When repeated maneuvers fail, expand the differential: incorrect canal localization, central positional vertigo (especially downbeat in head-hanging position), and short-arm BPPV variants are the main reasons.
- 5.Diagnosis here required a supine roll test because Dix-Hallpike was negative — always test both maneuvers when positional vertigo is suspected and one is unrevealing.