Thursday, September 19, 2019
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Videonystagmography (VNG) and Electronystagmography (ENG)

Videonystagmography (VNG) (Otometrics) and electronystagmography (ENG): Helps determine the cause of dizziness and balance diffi culty so that the treating physician can differentiate between a vestibular (inner ear), sensory (fine) touch, joint position) versus a central (brain) etiology prior to the planning of the patient’s management and treatment.

A VNG/ENG records the various eye movements and jerks known as nystagmus. These eye movements are controlled by neural connections that stretch from the balance mechanism within the inner ear to the eye muscles.

Dizziness or other balance disorders result in nystagmus that can only be detected by a sophisticated computer. VNG utilizes goggles, outfitted with an infrared camera to record nystagmus during a series of tasks. ENG utilizes electrodes that are placed onto the scalp to record electrical activity generated from eye movement.

A VNG/ENG test consists of four parts:

  • Occular Mobility
  • Optokinetic Nystagmus
  • Positional Nystagmus
  • Caloric Testing
VNG/ENG testing is useful for the following conditions:

  • Vertigo due to Benign Paroxysmal Positional Vertigo (BPPV)
  • Stroke & brain injury related dizziness
  • Dizziness due to age related degeneration of the vestibular system
  • Vertigo or dizziness not responsive to normal medical management, whether acute or chronic
  • History of one or more falls due to vertigo or dizziness, especially in the elderly
  • Car accidents and other traumatic events