Which symptom is more characteristic of BPPV onset?

Which symptom is more characteristic of BPPV onset?

• A. Hearing loss
• B. Nystagmus
• C. Photophobia
• D. Tinnitus

Answer: (B)

The main idea is that BPPV causes vertigo that starts with a change in head position and is accompanied by characteristic eye movements. When the head is moved, displaced otoconia in the semicircular canals provoke a brief, spinning vertigo, and you see nystagmus—rapid, involuntary eye movement—during evaluation or with the head-position changes. This ocular sign is a direct reflection of the abnormal vestibular input from the affected canal and is the hallmark of BPPV onset. Hearing loss, photophobia, and tinnitus are not typical features that define the onset of BPPV. Hearing loss points to cochlear or vestibulocochlear pathology, photophobia to migraine or intracranial issues, and tinnitus can occur with various inner-ear disorders but is not specifically characteristic of BPPV onset. So, nystagmus is the best indicator of BPPV onset because it directly demonstrates the vestibular disturbance caused by positional vertigo.

The main idea is that BPPV causes vertigo that starts with a change in head position and is accompanied by characteristic eye movements. When the head is moved, displaced otoconia in the semicircular canals provoke a brief, spinning vertigo, and you see nystagmus—rapid, involuntary eye movement—during evaluation or with the head-position changes. This ocular sign is a direct reflection of the abnormal vestibular input from the affected canal and is the hallmark of BPPV onset.

Hearing loss, photophobia, and tinnitus are not typical features that define the onset of BPPV. Hearing loss points to cochlear or vestibulocochlear pathology, photophobia to migraine or intracranial issues, and tinnitus can occur with various inner-ear disorders but is not specifically characteristic of BPPV onset.

So, nystagmus is the best indicator of BPPV onset because it directly demonstrates the vestibular disturbance caused by positional vertigo.