Single-sided deafness (SSD), sometimes referred to as unilateral hearing loss, is a condition in which an individual experiences significant or profound hearing loss in only one ear but can hear normally or better out of the other ear. While the majority of patients with a hearing impairment suffer from bilateral (two-sided) hearing loss, SSD is diagnosed in approximately 60,000 people in the United States each year.
There is no cure, and treatment can be a challenge because traditional amplification devices prove less effective. However, alternative options are available for managing single-sided deafness.
What Causes Single-Sided Deafness?
SSD can be caused by a variety of factors. One of the most common causes is an acoustic neuroma, a benign, slow growing tumor that can push against the auditory nerve and affect the ability to hear properly in one ear.
Sudden deafness – a rapid onset of hearing loss that occurs with little or no warning, often following a viral infection – is another condition commonly associated with SSD. Patients may fall victim to sudden deafness as a result of inflammation in the cochlea that causes permanent damage to the hair cells responsible for hearing.
Additional causes of SSD include trauma to the head, genetic disorders, Meniere’s disease, labyrinthitis, microtia, mastoiditis and even common childhood diseases such as measles and mumps.
Patients with SSD find understanding speech in the presence of background noise especially problematic and have great difficulty localizing sound (recognizing the location or origin of a sound source). Sound localization depends on subtle hearing cues from two ears; removing one ear from the equation confuses the brain. Other symptoms might include anxiety, stress, social isolation, dizziness, difficulty paying attention and speaking loudly.
Treatments for SSD
While there is no cure for single-sided deafness, options exist for helping patients cope with unilateral hearing. Traditional hearing aids are often ineffective. Contralateral Routing of Signal (CROS) hearing aids and Bone Anchored Hearing Aids can improve hearing and localization.
CROS devices utilize a microphone that is placed in the vicinity of the impaired ear and an amplifier near the normal ear. The microphone picks up sounds and transmits them to the patient’s “good” ear. A similar device known as BICROS is suitable for individuals with some degree of hearing loss in one ear and total deafness in the other.
Bone Anchored Hearing Aids (BAHA), are a surgically implanted device that uses direct bone conduction to transmit sounds from the affected ear to the normal/better one.
Call Southwest Idaho ENT at (208) 367-3320 for more information or to schedule an appointment.