What is acoustic impedancemetry and why ?


1. When appointed?

2. Contraindications

3. How to prepare?

Acoustic impedancemetry used to assess the state of the external auditory canal and middle ear.This method allows you to examine the state of the functions of the auditory tube and provides the information necessary to select the treatment strategy tubotitov.The results of acoustic impedance is one of the decisive factors in determining the indications for adenoidectomy.

Acoustic impedancemetry combines several modern methods of diagnostic testing, such as tympanometry and measurement of the acoustic impedance and acoustic reflex muscle.

Tympanometry is a highly informative method for studying the function of the middle ear.It allows you to determine the degree of mobility of the tympanic membrane, as well as the conductivity of the auditory ossicles, the so-called hammer, anvil and stapes.This is done by creating a pressure drop in the ear canal.Perform this diagnostic procedure only after checking the patency of t

he auditory canal and tympanic membrane integrity monitoring.

Acoustic reflexometer involves the study of reductions stapedius muscle, which occur in response to sound stimulation.The minimum sound level, which can cause a reduction stapedius muscle, called the acoustic reflex threshold.And the acoustic reflex - this is a reaction of the nervous system, aimed at countering the strong sound, in order to protect the organ of hearing from overload.This method is used for the early diagnosis of hearing loss.

acoustic impedance procedure itself is not complicated for the patient.It occupies no more than 5-10 minutes.Before testing in the auditory canal of the patient is inserted into a special rubber tube, and then the impedance device included.It causes changes in pressure and causes the eardrum to move.In this case the microphone associated with the introduction into the ear probe measures the pressure.All these manipulations do not cause pain or other unpleasant sensations.In this case the patient should keep still, as you can not talk or chew.

If you run the signal response of the nerve is missing, their volume increases.In this case the patient can hear the characteristic squeak and feel slight tension inside ushno mid card.

When he appointed?

Acoustic impedancemetry allow enough time to identify a wide range of pathologies.Usually it is prescribed for a variety of suspected ushno-auditory inflammation, perforation of the eardrum and timpanoskleroz.Also, this diagnosis is recommended when selecting a hearing aid.It also is used in infants, cochlear implantation or facial paralysis.It helps to detect flaws patency turbootit, neuromas.Perhaps it held in conjunction with the tone audiometry.

Contraindications Contraindicated

this diagnosis with auditory canal atresia or sulfur cluster epidermal masses, with symptoms of SARS and the common cold, as well as dysfunction of the auditory tube.

How to prepare?

Acoustic impedancemetry requires little or no training.The patient simply need to visit the doctor.The doctor before the investigation is required to remove sulfur deposits, unless of course they are.Also prior to the procedure, it necessarily examines the patient's medical history.Immediately after the study the patient can leave the hospital, since no adverse effects, this study has not.

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