Vertigo Quiz

Understanding Vertigo: A Core Concepts Guide for Health Professionals

Vertigo is a specific and often distressing symptom, not a diagnosis in itself. Mastering the nuances of its causes, classifications, and clinical features is crucial for exam success and safe clinical practice. This guide breaks down the essential concepts you need to know.

Differentiating Vertigo, Dizziness, and Presyncope

One of the most common exam traps is confusing the terms for balance issues. Vertigo is a distinct sensation of rotational movement (spinning) of either the patient or their surroundings. This is different from general dizziness (a vague sense of unsteadiness), or presyncope (the feeling of about to faint or “blacking out”).

Peripheral vs. Central Vertigo: The Critical Distinction

This is the primary branch point in any vertigo workup. Peripheral vertigo arises from the inner ear (vestibular system) or the vestibular nerve, while central vertigo stems from a problem in the brainstem or cerebellum. Peripheral causes are far more common and generally less ominous than central causes.

• Sudden, intense onset: Episodes are often severe and abrupt.
• Nausea and vomiting: Typically prominent due to the intensity of the sensation.
• Worsened by head movement: Patients often lie still to minimize symptoms.
• Auditory symptoms: Tinnitus or hearing loss may be present (e.g., Meniere’s, Labyrinthitis).
• Fatigable Nystagmus: Eye twitching that lessens with repeated testing.

Benign Paroxysmal Positional Vertigo (BPPV): The “Crystal” Problem

BPPV is the most common cause of peripheral vertigo. It’s a mechanical issue caused by dislodged calcium carbonate crystals (otoconia or canaliths) in the semicircular canals of the inner ear. These misplaced crystals create false signals of movement, triggered by specific changes in head position.

Meniere’s Disease: The Triad of Symptoms

Meniere’s is characterized by an excess of endolymph fluid in the inner ear. Remember the classic triad of symptoms for exam questions: episodic vertigo (lasting minutes to hours), fluctuating sensorineural hearing loss (usually low-frequency), and tinnitus. Patients often report a sense of aural fullness or pressure.

Vestibular Neuronitis vs. Labyrinthitis

These two conditions are often confused. Both involve inflammation, typically post-viral, causing severe, constant vertigo that can last for days. The key difference is that labyrinthitis also affects the cochlear nerve, causing hearing loss and tinnitus, while vestibular neuronitis spares hearing.

Key Diagnostic Maneuvers: Dix-Hallpike and Epley

The Dix-Hallpike maneuver is the gold standard for diagnosing BPPV. It involves positioning the patient to provoke the characteristic vertigo and torsional nystagmus. The Epley maneuver is not a diagnostic test but a therapeutic repositioning procedure used to guide the loose crystals out of the canal.

Understanding Nystagmus Patterns

The direction and type of nystagmus (involuntary eye movement) are critical clues. Peripheral vertigo typically causes a horizontal or horizontal-torsional nystagmus that is unidirectional (always beats in the same direction regardless of gaze). In contrast, purely vertical, purely torsional, or direction-changing nystagmus is a major red flag for a central cause.

Central Vertigo Red Flags

Always be vigilant for signs suggesting a central etiology, which requires urgent neurologic evaluation. Memorize these red flags:

• The “5 D’s”: Dysarthria, Dysphagia, Diplopia, Dysmetria, Dysesthesia.
• New, severe headache: Especially a “thunderclap” headache.
• Focal neurologic deficits: Weakness, numbness, or facial droop.
• Vertical or direction-changing nystagmus.
• Severe gait ataxia: Patient is unable to stand or walk unassisted.

Key Takeaways

• Vertigo is a specific illusion of movement; it is not synonymous with dizziness.
• The primary diagnostic goal is to differentiate between common peripheral causes and dangerous central causes.
• BPPV is the most frequent cause and is diagnosed with the Dix-Hallpike test and treated with the Epley maneuver.
• Nystagmus characteristics (direction, type) are invaluable for localizing the lesion to the peripheral or central nervous system.
• The presence of the “5 D’s” or other focal neurological signs with vertigo constitutes a medical emergency.

This content provides a general overview of vertigo for educational and informational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment from a qualified healthcare provider.