(ENG) market accounts for about $15,000,000 annually of the $700,000,000 total medical neurological diagnostic market.
The rotation test was delayed compared with electronystagmography
in demonstrating a vestibular abnormality, and the rotation test findings remained abnormal even as the patient's symptoms abated.
Based on a minimal history of vestibular symptoms, the findings of a peripheral vestibular disorder on electronystagmography
and no abnormal symmetry on sinusoidal vertical-axis rotation testing indicate a longstanding inner ear disorder.
This review of electronystagmography
based on class 3 evidence.
Phillips said, "This strong gain in 1998 revenues was primarily due to: (1) continuing growth in unit volume of our principal product, the House InfraRed/Video Electronystagmography
system; (2) a marketing structure revision in July 1998, involving both an altered commission arrangement with our Special Instrument Dealer group and the appointment of industry veteran Charlie Anderson as Marketing Manager for the Company; and (3) the addition of a new private label health-care customer.
The reliability of electronystagmography
in detecting a PLF is doubtful in patients with canal paresis; electronystagmography
has been reported as positive for fistula in 39% of patients with PLF and in 33% of those without it.
My first step was to look for objective evidence of a vestibular disorder with electronystagmography