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This review explores the significance of extended high-frequency hearing loss (above 8 kHz) and why it may be worth doing clinically more frequently. There are many conditions that may hide underneath a normal audiogram, and one of the easiest to find is hearing loss in the extended high frequencies (EHFs; >8 kHz).
We all know that humans can hear up to 20 kHz, yet hearing assessment in the clinic usually is restricted to 8 kHz. Frequencies above 8 kHz, therefore often are termed as extended high frequencies (EHFs) or ultra- or very-high frequencies.
High frequency hearing loss is commonly caused by the natural aging process or from exposure to loud sounds. In most cases it's irreversible, but there are ways to prevent it.
If speech seems muffled and you have trouble hearing women's and kid's voices, birds sing or doorbells ring, you may have high-frequency hearing loss. Learn the causes and treatments for this common type of hearing loss.
Extended high-frequency hearing loss has been consistently linked to histories of OME in childhood, related to severity or number of pressure equalization (PE) tube surgeries (Hunter et al., 1996; Laitila et al., 1997).
The most frequently used test for HHL diagnosis is the auditory brainstem response (ABR) analysis. In the animal model, HHL can be identified by a characteristic reduction in wave I peak amplitude in the absence of ABR threshold elevation or latency changes.
In this study, decreased hearing ability was seen at ultra highfrequencies in some patients with tinnitus who had normal hearing below 8 kHz. Thus, the proportion of patients with tinnitus who have normal hearing within the entire audible range is smaller than in previous reports.
If countries have the capacity to expand hearing screening beyond the standard frequencies for speech, monitoring of ultra-high frequency thresholds (> 8000 Hz) may improve early detection since high frequencies are the first affected in ototoxic hearing loss.
High frequency hearing loss is a common disorder that causes difficulty hearing high frequency or high pitched sounds. Learn more here.
Ultra high-frequency audiometry can be very useful in two common clinical situations: when testing people with normal or near-normal hearing thresholds on the standard audiogram who report significant perceived hearing difficulties;