Does the Variability of Evoked Tympanic Membrane Displacement Data (V ) Increase as the Magnitude of the Pulse Amplitude Increases?

Objectives: Evoked tympanic membrane displacement (TMD) measurements, quantified by V , record small volume changes in the ear canal following stimulation of the acoustic reflex. V shows a correlation with intracranial pressure (ICP) and has been proposed as an option to non-invasively measure ICP. The spontaneous pulsing of the tympanic membrane, driven by the cardiovascular pulse, may contaminate the recordings and contribute to high measurement variability in some subjects.