Shambaugh's criteria to identify sensorinueral deafness due to otosclerosis

Shambaugh's criteria to identify patients suffering from Sensorineural hearing loss due to otosclerosis:

1. Schwartze sign in either ear

2. Family history of otosclerosis

3. Unilateral conductive hearing loss consistent with otosclerosis and bilateral symmetric snhl

4. audiogram with a flat / "cookie - bite" curve with excellent speech discrimination

5. Progressive pure cochlear loss beginning at the usual age of onset for otosclerosis

6. CT scan showing demineralization of the cochlea typical for otosclerosis

7. Stapedial reflex demonstrating the biphasic "on-off effect" seen before stapedial fixation