Videonystagmography (VNG) is a test used to measure the integrity of the vestibular system (balance system) to see if dysfunction of the inner ear may be a contributing factor to loss of balance, lightheadedness, dizziness, and/or vertigo. This test will be ordered by your physician.
It is important to note that certain medical and diet restrictions are to be followed prior to the VNG test. A packet of guidelines and pertinent information will be mailed to the patient’s home address after the test appointment has been scheduled. This information is also available here.
During the VNG evaluation goggles will be placed over the patient’s eyes for the entire test. There is a unique relationship between the eyes and ears; therefore, small cameras within the goggles will be recording eye movements during specific tasks. The patient will be asked to track objects in front of them and will be placed in different body positions while the cameras are recording eye movements. For the final part of the VNG test, the audiologist will stimulate the balance organs with warm and cool air. Test time is approximately one and a half hours.
A Vestibular Evoked Myogenic Potential (VEMP) evaluation is a non-invasive test of the vestibular system, specifically the saccule and inferior portion of the vestibular nerve. VEMP testing is typically used to aid in the diagnosis of superior semicircular canal dehiscence (SSCD). This test will be ordered by your physician.
In preparation for the test, the audiologist will clean the patient’s forehead and the sides of the patient’s neck with a mild exfoliating scrub. Small metal disks will be taped on the patient’s forehead and neck and earphones will be placed in the patient’s ear canals. Clicking sounds will be presented to each ear individually and data will be recorded. During the recording, the patient will be asked to sit in a recliner and flex the muscles in the neck by turning the head to one side. Test time is approximately one hour.