Episodic vertigo with fluctuating hearing and aural fullness
A 47-year-old describes recurrent attacks of spinning lasting hours, each preceded by a sense of fullness and a drop in low-frequency hearing in one ear, with a roaring tinnitus. Between attacks, examination is near-normal.
Affected earContralateral ear
Affected-ear cVEMP shows a reduced amplitude; serial testing across frequencies shows the tuning peak shifted away from 500 Hz.
Which VEMP feature is most characteristic of endolymphatic hydrops?