title: Dynamic tympanometry.
abstract: Tympanometry was performed under the contraction of the middle ear muscles (dynamic tympanometry). A tympanogram of lesser compliance was observed under a stapedius reflex which was produced by contralateral acoustic stimulation. In patients with reversed (downward) stapedius reflex, the dynamic tympanogram showed either a higher peak amplitude or a shift of conventional tympanogram to the negative pressure side. Voluntary contraction of the tensor tympani produced a lesser compliance with positive pressure, whereas there was an apparent increase of compliance with negative pressure in the external auditory meatus. A shift of the dynamic tympanogram to the negative pressure side was interpreted as being due to contraction of the tensor tympani muscle. Dynamic tympanometry may also be utilized as a recording of reflex decay.
mesh_terms: D000158:Acoustic Impedance Tests; D006311:Hearing Disorders / Q000503:physiopathology; D006801:Humans; D009119:Muscle Contraction; D009132:Muscles / Q000502:physiology*; D012022:Reflex, Acoustic; D013198:Stapedius / Q000502:physiology* / Q000503:physiopathology; D013719:Tensor Tympani / Q000502:physiology* / Q000503:physiopathology; D014432:Tympanic Membrane / Q000502:physiology*