HEARING TESTS

HEARING TESTS
 
Hearing tests can be performed in children at any age due to the fact that there are available various test methods, which are selected according to the age, degree of child’s development and his communication skills.

The most commonly used methods of hearing tests in young children:

1.    INTERVIEW
•    The method, which is an essential link in the diagnostic process.
•    By obtaining detailed information concerning, among others, the progress of pregnancy and birth, family, diseases and environment, the path to determine the causes of losing hearing is shorter.
•    In the perinatal period, regardless of the outcome of hearing screening tests, the hospital staff gathers information about the risk factors of damaging hearing.

2.    OTOSCOPES EXAMINATION
•    The test, which allows the control of the condition of the hearing canal and tympanic membrane.
•    It allows you to notice physical damages, which can be the cause of the hearing loss.
•    The otoscope is inserted into the ear, it emits light.

3.    OAE – TESTING THE OTOACOUSTIC EMISSIONS
•    The test is performed without the active participation of the child.
•    It is performed during sleep or rest.  
•    It measures the activity of the hair cells stimulated by sound in the inner ear.
•    The microphone probe is inserted into the outer ear. If the green light flashes – it means the correct result, if red – the lack of response from the cochlea.
•    The test is used in the Program of Universal Screening Hearing Tests in Newborn Babies.
•    It is conducted in the second day of life. If the result is not satisfactory, it is repeated on the day the child is discharged from the hospital.




4.    ABR (BERA) – RESPONSE FROM THE BRAINSTEM; TESTING THE EVOKED HEARING POTENTIALS
•    Performed during sleep.
•    The test is performed without the active participation of the child.
•    The tested person puts on earphones, and the electrodes are attached to the head.
•    There is tested the brain’s reaction to sound. Electrodes measure nervous reactions of the brainstem in the response to the given sounds.
•    The threshold of hearing is tested.
•    The sounds are played several times with various frequency, in different strengths.

5.    ASSR – evoked hearing potentials of the set state
•    The test is performed without the active participation of the child.
•    The tested person puts on earphones, and the electrodes are attached to the head.
•    There is tested the brain’s reaction to sound. Electrodes measure nervous reactions of the brainstem in the response to the given sounds.
•    The threshold of hearing is tested.
•    The stimuli are given with high frequency.
•    Thanks to the possibility of using for stimulation tones modulated by frequency and amplitude there is obtained a higher level of stimulation than in the classic ABR test.


6.    TYMPANOMETRY
•    The test determining the stiffness of the tympanic membrane (acoustic impedance of the ear). It registers the tympanic membrane deflections with the change of the static pressure in the hearing canal.
•    The test used to determine the type of hearing loss and evaluation of the middle ear condition.
•    By using the reflex of the stapes muscle to the given acoustic stimulus we also determine the condition of the inner ear, checking the phenomenon of equalling the volume.
•    The test is performed without the active participation of the child.
•    There is a plug inserted tightly into the ear, which with the help of cables is connected with: the sound generator, microphone, pump changing the pressure in the hearing canal.