Acoustic impedance check1

Static compliance value: The maximum compliance when the pressure of the external auditory canal and the tympanic chamber are equal. It is usually called the static compliance value, which is the difference between the peak of the tympanogram and the baseline. Due to the wide distribution range of normal static sonic values, large individual differences, and more overlap with various middle ear diseases, it should not be used as a diagnostic indicator alone, for reference only.

Staple muscle acoustic reflex (acoustic stapedial reflex): The earplug probe is inserted into one external ear canal (indicating ear), and the earphone that transmits the stimulation signal is worn on the opposite ear (stimulating ear). Acoustic stimulation of a certain intensity (70～100dB above the threshold) can cause bilateral contraction of the stapedius muscles, increase the stiffness of the tympanic membrane of the ossicular chain, and a sonic change occurs. curve. This objective index can be used to identify various lesions on the reflex pathway.