Diagnostic Techniques for Vertigo
Introduction to Vertigo
- Vertigo is a sensation of rotational or spinning movement, often brief (seconds to minutes) for Benign Paroxysmal Positional Vertigo (BPPV) and hours to days for other causes, with triggers including positional changes, and associated symptoms such as hearing loss, tinnitus, and nystagmus 1, 2
- The clinical presentation of various vestibular disorders includes BPPV, vestibular neuritis, stroke/ischemia, vestibular migraine, and labyrinthitis, each with distinct characteristics and durations of vertigo, as described by the American Academy of Otolaryngology-Head and Neck Surgery 1
Diagnostic Techniques
- The Dix-Hallpike test is a diagnostic maneuver for vertigo, performed by positioning the patient seated upright, rotating the patient's head 45 degrees to the side being tested, quickly moving the patient from seated to supine position with head hanging 20 degrees below horizontal, and observing for nystagmus and vertigo, with a positive test characterized by nystagmus and vertigo that increases and resolves within 60 seconds 3, 2
- A structured approach to evaluating dizziness is recommended, focusing on timing, triggers, and associated symptoms, utilizing specific diagnostic maneuvers like the Dix-Hallpike test for vertigo, as suggested by the American Geriatrics Society 4
- The following table outlines the differences in clinical presentation between vertigo and non-vertiginous dizziness:
| Feature | Vertigo | Dizziness (Non-vertiginous) |
|---|---|---|
| Sensation | Rotational or spinning | Lightheadedness, floating, imbalance |
| Duration | Usually brief (seconds to minutes) for BPPV; hours to days for other causes | Variable |
| Triggers | Often positional changes (BPPV) | Often standing, exertion, medications |
| Nystagmus | Present with peripheral causes | Usually absent |
| Associated symptoms | May have hearing loss, tinnitus (Ménière's) | May have palpitations, visual changes |
Cardiovascular Evaluation
- A comprehensive cardiovascular examination should include checking heart rate and rhythm, as well as examining for carotid bruits and signs of heart failure, as recommended by the European Society of Cardiology 5
- Orthostatic vital signs should be checked for blood pressure drops when changing positions, as recommended by the European Society of Cardiology 5
- Orthostatic hypotension is diagnosed by a blood pressure drop of ≥20 mmHg systolic or ≥10 mmHg diastolic within 3 minutes of standing, treated with medication adjustment, hydration, compression stockings, and gradual position changes, according to the European Society of Cardiology 6
Treatment and Management
- Benign Paroxysmal Positional Vertigo (BPPV) is characterized by brief vertigo with position changes, diagnosed with a positive Dix-Hallpike test, and treated with the Canalith Repositioning Procedure (Epley maneuver), which has an 80% success rate, as recommended by the American Academy of Otolaryngology 4, 2, 3, 7
- Acute vestibular syndrome presents with sudden severe vertigo lasting days, diagnosed by unidirectional horizontal nystagmus and a normal HINTS exam, and treated with early corticosteroid therapy, with caution to rule out stroke, as advised by the American Neurological Association 4, 1
- Vestibular rehabilitation is effective for persistent dizziness after BPPV resolution and can be self-administered or clinician-directed, accelerating central compensation for vestibular imbalance, as suggested by the American Physical Therapy Association and the American Academy of Otolaryngology-Head and Neck Surgery 4, 7, 2
Patient Education and Safety
- Patients should be advised to remove tripping hazards, improve lighting, and install grab bars to ensure home safety, according to the American Academy of Otolaryngology-Head and Neck Surgery 2
- Patients should be educated on practicing fall prevention by implementing home safety measures and avoiding risky activities during dizzy episodes, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 2
- Validated assessment tools such as the Activities-Specific Balance Confidence Scale, Dizziness Handicap Inventory, Dynamic Gait Index, and Timed Up & Go test are recommended for evaluating balance and dizziness, according to the American Geriatrics Society and the American Occupational Therapy Association 4, 2, 8
Imaging and Special Considerations
- The American College of Radiology suggests that CT scans of the head are not routinely indicated for patients with isolated vertigo without focal neurological deficits, but should be performed when vertigo is accompanied by severe headache, age >60 years, vomiting, drug/alcohol intoxication, short-term memory deficits, trauma above the clavicle, seizures, or focal neurological deficits 9, 10
- The following imaging modalities may be indicated in certain cases:
| Indication | Imaging Modality |
|---|---|
| Acute Vestibular Syndrome (AVS) with abnormal HINTS examination | MRI brain (without contrast) |
| AVS with neurological deficits | MRI brain (without contrast) |
| High vascular risk patients with AVS even with normal examination | MRI brain (without contrast) |
| Chronic undiagnosed dizziness not responding to treatment | MRI brain (without contrast) |
Common Pitfalls to Avoid
- Common pitfalls to avoid include focusing on the quality of dizziness rather than timing and triggers, failing to perform the Dix-Hallpike maneuver in patients with positional vertigo, and routinely prescribing vestibular suppressants for BPPV, as advised by the American Academy of Otolaryngology 4, 2
- Missing central causes of vertigo by not performing the HINTS examination and ordering unnecessary imaging studies in patients with clear peripheral vertigo should also be avoided, according to the American Neurological Association and the American Academy of Otolaryngology-Head and Neck Surgery 4, 2