The Vertigo And Dizziness Program™ By Christian Goodman Vertigo and Dizziness Program is a designed to help stop vertigo and dizziness once and for all. Medical practitioner don’t know the exact cure for this condition but this program will show you exactly what you need to make this painful condition a thing of the past. This program has recommended a set of simple head exercises that help cure this condition.
Video head impulse test (vHIT)
The Video Head Impulse Test (vHIT) is a modern diagnostic tool used to evaluate the function of the vestibulo-ocular reflex (VOR) and assess the integrity of the vestibular system. This test is particularly valuable for diagnosing vestibular disorders that can cause vertigo and balance problems. Here’s an overview of vHIT:
Purpose
- Assess VOR Function: The primary aim is to measure how well the eyes stabilize during rapid head movements, which is crucial for maintaining clear vision and balance.
- Differentiate Vestibular Disorders: Helps differentiate between peripheral and central vestibular dysfunctions.
Procedure
- Setup:
- The patient wears lightweight video goggles equipped with high-speed cameras that track eye movements.
- The clinician ensures that the patient’s head and eye positions are calibrated.
- Head Impulse Testing:
- The clinician instructs the patient to fixate on a target (e.g., a dot on the wall) while they perform quick, unpredictable head turns to one side and then the other.
- The head movements are typically rapid and of short duration (approximately 20-30 degrees).
- The video goggles record the eye movements during these head impulses.
- Analysis:
- The recorded data is analyzed to assess the eye movements in relation to the head movements.
- The ratio of eye movement to head movement is measured, indicating how well the VOR is functioning.
Interpretation of Results
- Normal Response: In healthy individuals, the eyes will remain focused on the target despite the head movement, showing a compensatory eye movement (the eyes move in the opposite direction to the head).
- Abnormal Response:
- Reduced or Absent VOR: Indicates vestibular dysfunction, such as vestibular neuritis or labyrinthitis, where the inner ear is not providing adequate signals for eye stabilization.
- Catch-Up Saccades: If the eyes do not maintain fixation and instead exhibit corrective saccadic movements (quick, simultaneous movements of both eyes), it suggests impaired VOR function.
Advantages
- Quick and Non-invasive: The vHIT test is relatively quick to perform and does not require any invasive procedures.
- Real-time Analysis: Provides immediate feedback on vestibular function and can differentiate between various vestibular disorders.
- High Sensitivity: More sensitive in detecting subtle vestibular dysfunction compared to some traditional tests.
Limitations
- Patient Cooperation: The test requires the patient to remain focused on a target, and any difficulties with fixation can affect results.
- Limited Scope: While vHIT assesses the VOR, it may not provide a complete picture of all vestibular functions, so it is often used in conjunction with other tests.
Conclusion
The Video Head Impulse Test (vHIT) is an essential tool in the evaluation of vestibular function, particularly for diagnosing conditions that cause vertigo and balance disorders. By assessing how well the eyes stabilize during head movements, healthcare providers can gain valuable insights into the integrity of the vestibular system and guide further diagnostic and therapeutic approaches.
The Vertigo And Dizziness Program™ By Christian Goodman Vertigo and Dizziness Program is a designed to help stop vertigo and dizziness once and for all. Medical practitioner don’t know the exact cure for this condition but this program will show you exactly what you need to make this painful condition a thing of the past. This program has recommended a set of simple head exercises that help cure this condition.