Understanding Dizziness and Vertigo

1. Types of Dizziness

  • Mal de Debarquement Syndrome

    • Defined as an inadequate readaptation of the vestibular system following return to land (e.g., from a boat or plane).

    • Symptoms can include persistent orillatory movement (e.g., vertigo, rocking sensations, or imbalance), often experienced throughout the day.

    • Onset typically occurs 48 hours after exposure to the initial triggering event (e.g., a boat ride).

    • Symptoms worsen with active motion and may occur more than once a month.

2. Benign Paroxysmal Positional Vertigo (BPPV)

  • Causes and Risk Factors

    • Potential triggers include:

    • Head trauma

    • Prolonged immobility in one position

    • Demographic factors (more common in females)

    • Osteoporosis

    • Vitamin D deficiency

  • Symptoms of BPPV

    • Experience of vertigo lasting less than 2 minutes.

    • Intense sensations resembling room spinning episodes, known as "artunes".

    • Symptoms exacerbated by head movement.

2.1 Mechanisms of BPPV

  • Canalithiasis:

    • Dislodged otoconia (calcium carbonate crystals) in the semicircular canals lead to vertigo lasting less than 60 seconds, paired with nystagmus (involuntary eye movement).

  • Cupulolithiasis:

    • Otoconia adhered to the cupula causes vertigo lasting longer than 60 seconds, also associated with nystagmus.

3. Tests for BPPV

3.1 Dix-Hallpike Maneuver

  • Assessment Outcomes:

    1. Upbeating Nystagmus: posterior canal involvement

    • Left-sided upbeating nystagmus indicates left posterior canal.

    1. Downbeating Nystagmus: anterior canal involvement

    • Left-sided downbeating nystagmus indicates left anterior canal.

3.2 Supine Roll Test

  • Geotropic Nystagmus:

    • Right down-beating is indicative of geotropic behavior (ear affected is the dependent side).

    • Left down-beating indicates left geotropic behavior.

  • Apogeotropic Nystagmus:

    • Right beating suggests right apogeotropic behavior.

    • Left suggests left apogeotropic behavior.

4. Vestibular Exam Considerations

  • Assessment of vestibular hypofunction based on reported symptoms involves several tests:

    • Saccades - examining eye movement accuracy.

    • Smooth Pursuit - assessing the ability to follow a moving object smoothly.

    • Head Impulse Test - involves rapid head turns while maintaining visual fixation.

    • Dynamic Visual Acuity Test - typically assessed using a chart, where findings like a 23 line loss in the Snellen chart indicate impairment.

4.1 Dizziness/Vertigo Symptoms

  • Motion sensitivity can present with dizziness and vertigo that may lead to imbalance and fall risks.

  • A modified motion sensitivity test can differentiate between types of dizziness and vertigo.

5. Cervicogenic Dizziness

  • Characteristics

    • Often accompanied by neck pain and a sensation of disequilibrium or imbalance.

    • Symptoms may not include true vertigo but rather general dizziness associated with cervical issues.

5.1 Testing for Cervicogenic Dizziness

  • A combination of neck tests, including head-neck rotation and side-lying tests, may aid in establishing the origin of symptoms.

  • If both cervical and vestibular symptoms manifest, a treatment approach may focus on habituation therapies.

Conclusion

  • Comprehensive evaluation of dizziness and vertigo encompasses various vestibular tests, symptom assessment, and diagnostics, necessary for appropriate treatment interventions.

  • Differentiation between BPPV and cervicogenic dizziness is crucial for effective management.