http://www.asiaone.com/health/woman-wakes-unable-hear-mens-voices-including-her-boyfriend
Excerpt:
WHAT IS REVERSE-SLOPE HEARING LOSS?
According to Audiology Inc, reverse-slope hearing loss (RSHL) is a rare condition, affecting only 3,000 people in the US and Canada.
It's known as 'reverse-slope' because its shape on an audiogram is the reverse of ski-slope (high-frequency) hearing loss. The graph starts in the lower-left-hand corner and slopes upward steeply.
RSHL is also known as low-frequency hearing loss.
The main contributing cause of RSHL is genetics, but certain diseases affecting the hair cells responsible for sending sound information from the inner ear to the brain have been implicated as well. Examples include sudden hearing loss, Ménière’s disease, and viral infection.
Another possible source of RSHL is due to a change in pressure of the endolymph, or fluid in the inner ear.
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