VNG full test (static, calorimetry and rotational)

• The patient should not take any medications that affect the central nervous system (e.g. sedatives, some medications used to treat dizziness) for 48 hours before the examination.
• You should not drink alcohol the day before the test.
• The examination should be performed at least 4 hours after a meal, because stimulation of the labyrinths during the VNG examination triggers symptoms such as dizziness, nystagmus, nausea, and sometimes vomiting.
• Women should not wear eye makeup (especially eyelashes).
• The result is available within 7 working days of the test.

The VNG test assesses the most important parameters of nystagmus – an objective symptom associated with vertigo. The test involves observing spontaneous nystagmus using a video camera placed in goggles. Its speed, direction, form, amplitude, and intensity are assessed. Based on this data, damage to parts of the balance system, either peripheral or central, can be assessed. The presence of spontaneous nystagmus is significant when performing other VNG tests.
Spontaneous nystagmus is recorded in various situations: spontaneous nystagmus, gaze nystagmus, positional nystagmus - during a change of position, fixation nystagmus.

Calorimetry:
This test involves stimulating the labyrinth (lateral semicircular canals) bilaterally by injecting cold and warm air into the ear canal, followed by observation of the nystagmus using goggles with a video camera, particularly its symmetry after bilateral stimulation, as well as its activity and duration. The test assesses each labyrinth separately. This is a nonphysiological stimulus-induced test.

Rotation Tests
: The diagnosis of vertigo utilizes the most physiological stimulation of the vestibular system, which is a change in position through rotational movement with appropriately selected angular acceleration parameters. The test consists of several rotational and pendulum tests. NIR – rotation-induced nystagmus (bilateral stimulation of the labyrinth). BURST tests assess the vestibulo-oculomotor reflex without and with visual fixation, the vestibular-ocular reflex (with a diaphragm over the eyes) during pendulum movements, and the cervico-ocular reflex, which allows for the assessment of stimulation from the cervical receptors. These tests simultaneously examine both vestibules and allow for the detection of balance system dysfunction and the diagnosis of peripheral, central, or mixed impairments.

A complete VNG test allows for the diagnosis of disorders such as:

• direct damage to the labyrinth (loss of function),
• benign positional vertigo,
• Menier's disease,
• vestibular neuron inflammation,
• complications after otitis media,
• motion sickness.