Negative rinne test1/17/2024 ![]() ![]() Auditory brainstem response (ABR): use electrodes to monitor brain activity response to sound stimulus, can be done at any age but will often need to be sedated after 6mo.Evoked otoacoustic emissions (EOAE): test function of outer hair cells, often used as a newborn hearing screen.In children testing varies according to age:.The patient’s ability to hear these tones is plotted on a graph to create an audiogram.During testing, the audiometer delivers various “pure tone” sounds at particular frequencies and intensities, from low to high.Human speech usually falls between 250Hz and 6000Hz.Audiograms typically test frequencies between 250Hz and 8000Hz.The average human can hear between 20 and 20,000 Hz.Frequency is measured in Hertz (Hz), which is often thought of as the “pitch” of the sound.For reference, normal conversation is around 60 dB.Standard audiograms test between 0 and 110dB.An increase of 20 dB means the sound is 100-fold more intense. ![]() An increase of 10 dB means a 10-fold increase in sound intensity.The decibel scale is logarithmic (based on a factor of 10):.Intensity of sound is measured in decibels (dB) which can be thought of as the ‘loudness' of the sound.The results of an audiogram can help direct medical and surgical interventions to improve and/or preserve hearing function.Hearing loss can be divided into two categories: conductive or sensorineural.Audiograms are created by plotting the thresholds at which a patient can hear various frequencies.Audiograms are used to diagnose and monitor hearing loss. ![]()
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