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Difficulty: HardPhysical Examination Findings

An independent 62-year-old gentleman is brought to the emergency department by his daughter due to an abrupt onset of a severe room-spinning sensation that began 6 hours ago. He reports intense nausea and an inability to walk without assistance. His past medical history is significant for essential hypertension and hyperlipidemia. Vital signs show a blood pressure of 165/95 mmHg, heart rate of 88/min, and respiratory rate of 16/min. The patient is alert and fully oriented. Cardiopulmonary examination is unremarkable. During the neurological evaluation, the physician performs a provocative positioning test by rapidly moving the patient from a sitting to a supine position with his head turned 45 degrees. This maneuver immediately elicits purely vertical, down-beating nystagmus that persists continuously for over 2 minutes without diminishing in intensity. The patient's hearing is intact bilaterally to finger rub. Based on these physical examination findings, which of the following is the most appropriate next step in the management of this patient?

  1. Magnetic resonance imaging of the brainAnswer
  2. B
    Repositioning of canalith particles via the Epley maneuver
  3. C
    Discharge home with a prescription for oral meclizine
  4. D
    Non-contrast computed tomography of the temporal bone
  5. E
    Administration of intravenous alteplase

Answer

Magnetic resonance imaging of the brain
The correct action is to obtain magnetic resonance imaging (MRI) of the brain. The physician performed the Dix-Hallpike maneuver, a provocative physical examination test. The patient exhibited purely vertical, down-beating nystagmus that occurred immediately (no latency period) and persisted without fatiguing. These physical examination findings are highly specific for a central nervous system etiology, such as a cerebellar or brainstem infarction. In a patient with vascular risk factors presenting with acute central vertigo, neuroimaging is paramount. MRI of the brain is the most appropriate next step because it is significantly more sensitive than computed tomography (CT) for detecting acute ischemia in the posterior fossa.

Step-by-Step Solution

1
Analyze the patient's presentation and provocative physical examination findings.
The patient has acute vertigo with purely vertical, non-fatiguing nystagmus that lacks a latency period during a positioning maneuver.
Accurate interpretation of nystagmus characteristics is required to distinguish between peripheral and central causes of vertigo.
2
Correlate the physical examination findings with the underlying pathophysiology.
These specific nystagmus characteristics strongly indicate a central nervous system lesion, such as a posterior circulation stroke.
Purely vertical nystagmus is a red flag for central pathology, whereas peripheral nystagmus is typically mixed horizontal-torsional, fatigable, and has a latency period before onset.
3
Determine the most appropriate next step in management based on the diagnostic deduction.
Urgent neuroimaging with an MRI of the brain is required.
MRI is the most sensitive imaging modality for evaluating ischemic strokes in the posterior fossa (brainstem and cerebellum).

Key Concept

Differentiating central from peripheral vertigo based on physical examination findings (nystagmus characteristics).
Estimated Time:1m 30s
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Topics

Physical Examination Findings

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