Ecog Flashcards
1
Q
What is electrocochleography?
A
Measures an auditory evoked potential is obtained in response to sound stimuli by an extratympanic electrode.
2
Q
What is measured?
A
The cochlea microphonic and the summating potetnial are created by hair cells SP and the compund action potential of the auditory nerve is the response of many nerve fibres AP
3
Q
Ratios?
A
The SP compared to AP ratio is calculated. With changes in SP as a result of changes fluid pressure of the scala media and vestibuli. Criteria change according to which ecog system used
4
Q
Results..
A
An enlarged SP to AP ration may be indicative of Menieres disease
