VNG Testing

Pure Tone Audiometry

Vestibular neuritis (VN) is a condition characterized by inflammation of the vestibular nerve, which connects the inner ear to the brainstem and is responsible for transmitting signals related to balance and spatial orientation. VNG testing, or Videonystagmography testing, is a diagnostic tool used to assess the function of the vestibular system and identify any abnormalities that may be contributing to symptoms such as vertigo, dizziness, and imbalance.
During VNG testing, the patient undergoes a series of assessments that evaluate different aspects of vestibular function. These tests are typically conducted in a specialized clinic or office equipped with the necessary equipment and trained personnel.
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  1. Oculomotor Testing: This involves tracking the movement of the eyes using infrared goggles or cameras. The patient may be asked to follow a moving target with their eyes, such as a light or patterned image displayed on a screen. This helps evaluate the coordination of eye movements, which is closely linked to vestibular function.

  2. Caloric Testing: This test assesses the response of the vestibular system to changes in temperature. It involves irrigating the ear canals with warm and cool water or air while monitoring the resulting nystagmus, which is an involuntary rhythmic movement of the eyes. The direction and intensity of nystagmus provide valuable information about the function of each inner ear.

  3. Positional Testing: Positional testing evaluates how changes in head position affect the vestibular system. The patient is placed in various positions, such as lying down or turning the head to the side, while the eye movements are monitored. This helps detect conditions like benign paroxysmal positional vertigo (BPPV), where specific head movements trigger vertigo due to displaced inner ear crystals.

  4. Spontaneous Nystagmus Evaluation: Spontaneous nystagmus refers to involuntary eye movements that occur without any external stimulation. By observing the patient’s eye movements in different positions and conditions, clinicians can identify the presence and characteristics of spontaneous nystagmus, which can provide clues about underlying vestibular dysfunction.

  5. Rotational Chair Testing: In this test, the patient sits in a motorized chair that rotates at different speeds and directions. By measuring the eye movements during rotation, clinicians can assess the vestibulo-ocular reflex (VOR), which is crucial for stabilizing vision during head movements. Abnormal responses may indicate dysfunction within the vestibular system.

Overall, VNG testing plays a crucial role in diagnosing vestibular disorders and guiding appropriate management strategies. By providing objective data about vestibular function, it helps healthcare providers formulate tailored treatment plans aimed at relieving symptoms and improving quality of life for patients affected by vestibular conditions.

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