ENG検査時の角膜網膜電位の変化について Studies on Corneo-Retinal Potentials during ENG Test
Changes of Corneo-Retinal Potentials (CRP) were studied during routine equilibrium function tests and various visual conditions in healthy subjects. The changes in CRP were measured by amplitudes of horizontal 10° calibration.<BR>1. In routine examinations, CRPs showed increased or decreased responses after each examination.<BR>2. CRPs mostly increased after OKP tests during routine equilibrium function tests. However, in the examinations of OKN of 30°/sec, 60°/sec, and 90°/sec, CRPs showed similar increases for each OKN velocity.<BR>In the younger group (21-39 years), the CRPs were more increased than those in the older group (65- years) after OKP test. When OKP test was performed two times, there were no significant differences between the CRPs caused by the first examination and the second one.<BR>3. CRPs showed a response decline after caloric test.<BR>4. CRPs were examined every two minutes after electrodes were placed on the subjects, in an illuminated room with eyes open. The CRPs increased gradually until 8 minutes later. With eyes closed in an illuminated room, and with eyes open and closed in a dark room, CRPs decreased until 8 minutes later.<BR>5. CRPs during equilibrium function tests were changed by visual conditions (light or dark). However they were not changed by eye movements.
- Equilibrium research
Equilibrium research 58(6), 626-631, 1999-12-01
Japan Society for Equilibrium Research