This function allows the systematic collection and recording of a patient‘s dizziness history. This step can thus be delegated.
Here you can document and supplement findings from ear exams, vestibulospinal tests, vision exams, blood tests and other exams.
Often, images are taken during the vertigo diagnosis process. Such images include photos of the eardrum taken during otoscopic examinations or images of the fundus of the eye taken with an ophthalmoscope, or X-ray films. These images and of course PDF files can be saved to the patient database and printed as part of the report.
Dizziness Handicap Inventory
When this well-known questionnaire is used with VertiPACS®, the program calculates the score and subscores and instantly generates a result. Using VertiQuest®, a patient can even do this test independently of a doctor.
This test is used to calibrate the distance between the
patient‘s eye and the beam splitter mirror of the video goggles.
The Head Impulse test (HIMP) enables a sidedependent evaluation of all six semi-circular canals. In the test result the head trace can be superimposed on or mir-rored with the eye trace. It is also possi-ble to mirror the diagram for the left ear. The playback function allows simultan-eous playback of the eye video and the head and eye traces in the position and velocity domain.
The SHIMP (Suppression Head Impulse test) is a new variant of the Head Impulse test. It lets you see whether and to what degree any residual function remains on the affected side. The patient‘s task is to stare at a built-in LED which is used as a fixation target during the test to prevent covert saccades (“saccade-killer”). The completely light-proof and magnetically held eye cover facilitates the test.
Dizziness caused by a malfunctioning of the optokinetic system is indicative of a central nervous system disorder. This test allows an examination of the optokinetic system using various stimuli in the horizontal and vertical planes.
Disorders of the pursuit system can be detected with this test. It enables an examination of the pursuit system with horizontal and vertical stimuli at four velocities. The horizontal and vertical stimuli have a fixed amplitude of ±15° and ±10°, respectively.
The test allows the assessment of the saccade system via horizontal and vertical stimuli with an amplitude of between ±5° and ±30°. They alternate directions and are equal in number. Speed, precision and latency are assessed, along with the number of trials, error saccades, valid saccades and express saccades.
This test is performed to detect gaze dependent nystagmus. The duration of the measurement, the step duration and step amplitude horizontal and vertical can be set by the user.
During the presentation of the horizontal gaze target, the fixation target at zero position remains for a short time. The direction of the horizontal gaze target is random, with an amplitude of either ±10° or ±20°.
This test is used for the separate asses-sment of reflexive saccades (prosacca-des) and voluntary saccades (antisacca-des). When the visual stimulus is presented, the patient is asked to look at a point mirroring the position of the stimulus. The stimulus is horizontal with a random direction and amplitudes of ±10° and ±20°.
This are saccades generated in antici-pation of the appearance of a target at a particular location. In this test, the ampli-tude of the visual target is always ±20°, and the horizontal target jumps in a regular sequence. After a short period of getting used to the stimulus, the patient can perform the saccade even before the new visual target appears, due to the internal image of the saccade (efference copy).
This test assesses the patient’s ability to generate a saccade to a location in which a target has been previously present. The direction and amplitude of the horizontal stimulus are random. The amplitudes are ±10° and ±20°.
Subjective Visual Vertical
VertiSVV® enables the determination of both the Subjective Visual Vertical and the Subjective Visual Horizontal. In ad-dition to the classic protocol, which has the patient in a fully upright position, tests can be performed in up to 12 tilt positions per side to assess the func-tioning of the utricle and saccule at the same time. The test results are displayed as a graph and in a table with the mean value and standard deviation computed.
The test result can be displayed either in a relative diagram alone or as a combi-nation of relative and absolute diagrams.
VertiChair® is a multi-purpose rotary chair system for the diagnosis and treat-ment of vestibular disorders. Its powerful step engines allow the subject to be turned in the pitch and yaw plane at the same time, providing a unique range of motion. Its motor-driven sled can even move the subject out of the yaw axis to enable eccentric rotations.
The chair is controlled by VertiPACS®, the integrated software for all ZEHNIT vesti-bular products.
The system can be position-driven and velocity-driven. It lets the user perform all major vestibular procedures and tests, including standard and user-defined pro-cedures for the diagnosis and treatment of BPPV. The preset procedures are:
Classical Rotary Chair Tests
» Impulse Acceleration Test
» Constant Acceleration Test
» Sinusoidal Acceleration Test
» Sinusoidal Harmonic Acceleration Test
» Velocity Step Test
Unilateral Centrifugation (VertiSVV®)
This test is performed to assess the function of each utricle separately. First, the seated patient is rotated on the vertical axis until the chair reaches its final velocity. Then the chair is moved a few centimetres to the side, just enough to bring one utricle into the centre of the rotation. Now the function of the other utricle can be assessed, either through a Subjective Visual Vertical (SVV) test or by means of 3D oculography. Acceleration, velocity, offset and number of repetitions can be set.
This test offers the same test parameters as the test described above. The eye mo-vements are tracked via the VertiGog-gles®.
BPPV Chair test
This is a rotary chair test for the diagnosis of BPPV. In addition to diagnostic uses, it allows the treatment of all kinds of BPPV. Predefined and user-defined procedures can be performed to determine and utilize the most effective treatments.
The multi-purpose rotary chair system VertiChair® is currently only available in countries that accept CFDA approval.