Have we just found the smoking gun, @turnitaround?
All of those tests I listed above were performed in March, 2016. At the visit where the doctor went over all of the results with us, we just remember him saying that all of my results were fine. He said that there's nothing wrong with my vestibular system, so it's probably vestibular migraine. And sent me on my way.
Click here for my normal test results
- Audiological Analysis: Excellent hearing
- OAE (Evoked Otoacoustic Emissions): normal
- BAER (Brainstem Auditory Evoked Response): normal
- CDP (Computerized Dynamic Posturography): normal
- VEMP (Vestibular-Evoked Myogenic Potentials): normal
- V/ENG (Video/Electronystagmography): normal
- MRI of the brain, with and without contrast: normal
BUT, last night when I was making that list of tests, I noticed the ECoG (Electrocochleography) results. And they weren't quite "normal:"
Right ear SP was evident at normal negative values.
Left ear SP was evident at elevated negative values.
Right ear SP/AP ratio was 38% (SP = .13, AP = .33)
Left ear SP/AP ratio was 64% (SP = .17, AP = .26)
I looked up "SP/AP ratio" on Dr. Hain's website and found this:
ECOG results are reported as an SP/AP ratio. A very conservative criterion for abnormality is a ratio of 0.5 or greater is considered abnormal. When attempting to diagnose Meniere's, a criterion of 0.41 might be a better choice.
That quote is from his page on ECoG testing.
Now, there is a lot of discussion on his page about the limitations of the ECoG test, and it sounds like that test alone is not enough to determine someone's diagnosis.
But, in my case, doesn't it appear to show that there might be something going on, at least with my left ear?
Here are my actual ECoG test results: