Left-posterior canal benign paroxysmal positional vertigo (BPPV)
The patient is in the left Dix-Hallpike position, and upbeat and left-torsional nystagmus is present. This pattern is consistent with left-posterior canal BPPV. The patient then sits up and is put in the right Dix-Hallpike position, and downbeat and right torsional nystagmus is present. This pattern is compatible with “unwinding” of left-posterior canal BPPV.