Dec 2019 Healthy Hearing

One of the more rare forms of hearing loss is known as low-frequency hearing loss, often referred to as "reverse-slope" hearing loss. This name is because of how it appears on an audiogram, a standardized chart audiologists and hearing instrument specialists use to measure hearing levels during testing

reverse

Low-frequency hearing loss is defined as a reduced ability to hear low-pitched sounds, such as men's voices, bass sounds in music and thunder. How well you hear these sounds—or not—depends on the degree of your hearing loss, which can range from mild to profound.  When it comes to speech, this type of hearing loss mostly affects how you perceive the volume of speech—as in, how loud it sounds. It also makes it harder to hear vowel sounds, which are spoken at a lower-pitch than consonant sounds. Unlike high-frequency hearing loss, it's helpful to have people speak louder, as it will improve your ability to hear lower sounds (assuming you don't wear hearing aids). 

You may find it easier to understand women and children versus men, especially if they talk loudly. You may struggle to hear on the phone when compared to in-person conversations. Also, car, truck and airplane engines probably don't make many "rumbling" sounds for you, and music may sound very tinny. You might also seem uncannily good at hearing very high-pitched sounds that other people don't notice or can't hear. You may prefer people stand very close when they speak to you. Your own spoken speech probably sounds fairly normal.

In some cases, this type of hearing loss is genetic or acquired after a childhood illness. But most cases are linked to Meniere's disease, an autoimmune disorder that causes hearing loss, dizziness and tinnitus. However, the hearing loss may evolve over time, progressing to other types of hearing loss that affect sounds across the spectrum of pitches. 

Unfortunately, because this type of hearing loss is rare, it's sometimes misdiagnosed or undiagnosed for years, if not decades. Standard hearing tests are usually set up (or calibrated, in scientific terms) to detect other types of hearing loss. With correct and rigorous testing, though, an audiogram will show a "reverse-slope" that slopes from low to high, a pattern that indicates the loss of low-pitched sounds. This is opposed to the far more common high-frequency hearing loss, which slopes from high to low on an audiogram.

Hearing aids can help amplify lower sounds without over-amplifying higher-pitched sounds. However, because of the rarity and complexity of this type of hearing loss, it can take a little (or a lot) of trial and error to find the right amplification. One issue you might deal with, for example, is a hearing loss phenomenon known as recruitment. You'll want a patient and experienced audiologist to help you sort out the best treatment for you. If you have Meniere's, it's important to follow your doctor's recommendations to preserve what hearing you have. 

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