1.Peripheral vs Central
Peripheral: vestibular neuritis, BPPV, Meniere's. Central: stroke (AICA/PICA), MS, mass. HINTS helps distinguish.[+]
2.HINTS
Head impulse normal → peripheral; abnormal → central. Nystagmus direction-changing or vertical → central. Skew → central. Plus: hearing loss + vascular risk → stroke. One central finding: image.[+]
3.Imaging and Workup
MRI brain with DWI for stroke; CT insufficient. Audiometry if hearing loss. Dix-Hallpike for BPPV.[+]
4.BPPV
BPPV: brief, positional. Dix-Hallpike; Epley for posterior canal. Horizontal: roll.[+]