A fifty-year-old man, presents to his local physician complaining that he often feels as if the room is spinning when he gets up from a recumbent position or turns his head. He has not lost consciousness and has had no chest pain. He has no cardiac history and a recent treadmill test showed no abnormalities. On examination, the sensation can be produced by rapidly turning the head. It can be reproduced many times, but it eventually ceases. Nystagmus is elicited. Hearing is normal. Which of the following is the most likely mechanism for this patient’s symptoms?
A fifty-year-old man, presents to his local physician complaining that he often feels as if the room is spinning when he gets up from a recumbent position or turns his head. He has not lost consciousness and has had no chest pain. He has no cardiac history and a recent treadmill test showed no abnormalities. On examination, the sensation can be produced by rapidly turning the head. It can be reproduced many times, but it eventually ceases. Nystagmus is elicited. Hearing is normal. Which of the following is the most likely mechanism for this patient’s symptoms?
💡 Explanation
## **Core Concept**
The patient's symptoms suggest a vestibular disorder, specifically one that is related to the inner ear. The presentation of vertigo triggered by head movements, absence of hearing loss, and the presence of nystagmus point towards a peripheral vestibular issue.
## **Why the Correct Answer is Right**
The symptoms described are classic for **Benign Paroxysmal Positional Vertigo (BPPV)**. BPPV is caused by the movement of otoconia (calcium carbonate crystals) within the inner ear, specifically within the semicircular canals or the otolith organs (utricle and saccule). When these crystals move, they can stimulate the hair cells in the canals, leading to abnormal signals being sent to the brain, which interprets these signals as movement, causing vertigo. The vertigo is typically triggered by specific head movements and is associated with nystagmus. The fact that the symptoms can be reproduced multiple times but eventually cease also supports this diagnosis.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, incorrect options might include other causes of vertigo such as Meniere's disease, vestibular neuritis, or central causes of vertigo.
- Meniere's disease is incorrect because it is associated with hearing loss, tinnitus, and ear fullness, none of which are mentioned in the scenario.
- Vestibular neuritis is incorrect because it presents with acute onset of vertigo that lasts for days, not triggered by specific head movements.
- Central causes of vertigo (e.g., stroke, multiple sclerosis) are incorrect because they often have additional neurological deficits and the vertigo may not be as clearly provoked by head movements.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl for BPPV is the **Dix-Hallpike maneuver**, which is a diagnostic test for BPPV. The patient is moved from a sitting position to a supine position with the head turned to one side and extended slightly. A positive test reproduces the patient's symptoms and elicits nystagmus. This maneuver can help confirm the diagnosis of BPPV and guide treatment, such as the Epley maneuver, a series of movements used to treat BPPV by relocating the otoconia.
## **Correct Answer:** .
✓ Correct Answer: A. Aberrant stimulation of hair cells
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