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Normal young, healthy human ears can actually hear frequencies as low as 20Hz and as high as 20,000Hz.
Bone conduction thresholds are marked on the audiogram as P (better ear), [(right ear) or] (left ear). If the hearing thresholds obtained by bone conduction are the same as the air conduction thresholds, this indicates that there is nothing stopping the sound from traveling through the outer or middle ear to the cochlea. If the bone conduction hearing thresholds are normal, but there is a loss of hearing for air conduction sounds, this is called a conductive hearing loss.
Whatever its cause, conductive hearing loss decreases the energy of the sound waves that causes the fluid of the inner ear to move, this translates as a decrease in sound perception. Treatment of this condition begins by re-establishing the ventilation of the middle ear by inserting small vents, called grommets, into the eardrum. Repair of the ossicular chain: ossicle prosthesisA perforated eardrum or the blockage or damage of the ossicles can be remedied by surgical intervention or a hearing aid.

However, we test hearing in the range 250Hz to 8000Hz, as most of the sounds of speech occur in this frequency range. It indicates how much hearing varies from normal and, if there is a hearing loss, where the problem might be located in the hearing pathway.
This means that the cochlea is normal, but there is some blockage to sound in the middle or outer ears. Middle ear conditions caused by Otitis Media can be corrected by medical or surgical treatment. Although the inner ear still works properly, sound is perceived as less intense because of the attenuation of the sound vibrations. This extremely common surgical intervention is accompanied by further diagnostic tests into the underlying cause of the condition, and further treatment.This cause is often abnormal function of the Eustachian tube, which can occur with gastric reflux, allergy, smoking (even passive), or by the presence of considerable vegetal growth in the tube. Each method has its advantages, inconveniences and counter-indications.In a first case, reconstructing the ossicles aims to return the physical integrity to the system that transmits the sound, therefore improving the mechanical conduction of sound vibrations.

For example, 250 Hertz (250Hz) sounds like middle C on the piano, while the high pitched ringing of the telephone is about 3000Hz. Conversational voice level is around 65 decibels, and 120 decibels (120dB) is very, very loud – about as loud as a jet taking off if you are standing 25 metres away! Nevertheless, depending upon its cause (noise trauma, Meniere’s disease, auto-immune problems…), specific treatments can be used with variable outcomes.

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