Hallpike test is done for –
**Core Concept**
The Hallpike test, also known as the Dix-Hallpike maneuver, is a clinical examination used to assess patients with suspected benign paroxysmal positional vertigo (BPPV). BPPV is a condition characterized by brief, intense episodes of vertigo triggered by specific head movements.
**Why the Correct Answer is Right**
The Hallpike test involves rapidly moving the patient's head from a sitting to a supine position while their eyes are closed. This maneuver is designed to elicit a response in the posterior semicircular canal, which is often affected in BPPV. The test is based on the principle that the otolith organs (utricle and saccule) are involved in detecting linear acceleration, whereas the semicircular canals are involved in detecting rotational acceleration. In BPPV, the otolith debris enters the semicircular canal, leading to abnormal stimulation of the vestibular nerve and resulting in vertigo.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the Hallpike test is not used to assess patients with Meniere's disease, which is a different vestibular disorder.
**Option B:** This option is incorrect because the Hallpike test is not a diagnostic tool for acute vestibular neuronitis.
**Option C:** This option is incorrect because the Hallpike test is not used to assess patients with labyrinthitis.
**Clinical Pearl / High-Yield Fact**
The Hallpike test is a critical examination for diagnosing BPPV, and it is essential to note that the patient may experience a brief episode of vertigo during the test. The test can be repeated several times to confirm the diagnosis.
**Correct Answer:** C.