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Home >> Specialities >> ENT, Cochlear Implant & Voice Disorders >> Conductive Hearing Loss

Conductive Hearing Loss

Conductive hearing loss is a common type of hearing impairment that affects the transmission of sound waves from the outer ear to the inner ear and, ultimately, to the brain. Unlike sensorineural hearing loss, which involves problems with the inner ear or auditory nerve, conductive hearing loss is typically related to issues in the outer or middle ear.

Causes of Conductive Hearing Loss
Conductive hearing loss can result from various factors and conditions that interfere with the normal transmission of sound through the ear. Some common causes include:

  • Earwax Buildup: Excessive earwax can block the ear canal, preventing sound waves from reaching the eardrum.
  • Middle Ear Infections: Infections in the middle ear, often referred to as otitis media, can lead to fluid accumulation and inflammation, disrupting sound conduction.
  • Otosclerosis: This condition involves the abnormal growth of bone in the middle ear, which can immobilize the stapes bone and hinder sound transmission.
  • Perforated Eardrum: A hole or tear in the eardrum, often caused by infection, injury, or a foreign object, can disrupt the ear's ability to transmit sound.
  • Malformation of the Ear: Congenital abnormalities or structural issues in the ear can impede sound conduction.
  • Tumours or Growths: Abnormal growths, such as benign tumours or cholesteatomas, can obstruct the ear canal or middle ear, causing hearing loss.
  • Foreign Objects: Objects lodged in the ear canal, such as toys or insects, can physically block sound waves.
  • Trauma or Injury: Head trauma or severe ear injuries can damage the structures responsible for sound transmission.

Symptoms of Conductive Hearing Loss
The symptoms of conductive hearing loss can vary in severity and may include:

  • Reduced Hearing: Individuals with conductive hearing loss often experience a noticeable decrease in their ability to hear sounds, particularly those at lower volumes.
  • Muffled or Distorted Sound: Sounds may seem unclear or muffled, making it challenging to understand speech or follow conversations.
  • Ear Discomfort: Discomfort, pain, or pressure in the affected ear is common, especially if the condition is related to infection or earwax buildup.
  • Tinnitus: Some people with conductive hearing loss may experience ringing, buzzing, or other phantom noises in the affected ear.
  • Feeling of Fullness: A sensation of fullness or blockage in the ear may be present.
  • Balance Issues: In some cases, conductive hearing loss can disrupt the balance system within the inner ear, leading to dizziness or vertigo.

Diagnosis of Conductive Hearing Loss
Diagnosing conductive hearing loss typically involves a thorough evaluation by an audiologist or an ear, nose, and throat (ENT) specialist. The diagnostic process may include:

  • Medical History: Gathering information about the patient's hearing loss, symptoms, and any relevant medical history.
  • Physical Examination: A physical examination of the ear to check for visible issues such as earwax buildup or signs of infection.
  • Audiometry: Audiometric tests, including pure-tone audiometry and bone conduction tests, help determine the type and severity of hearing loss.
  • Tympanometry: Tympanometry assesses the movement of the eardrum in response to changes in air pressure, providing information about middle ear function.
  • Imaging: In some cases, imaging tests like CT scans or MRIs may be used to visualize the structures of the ear and identify any abnormalities.

Treatment Options for Conductive Hearing Loss
The treatment approach for conductive hearing loss depends on the underlying cause. Common treatment options include:

  • Earwax Removal: If excessive earwax is the culprit, a healthcare provider can safely remove the buildup, often restoring normal hearing.
  • Medication: Middle ear infections are typically treated with antibiotics or other appropriate medications to resolve the infection and reduce inflammation.
  • Surgery: In cases where structural abnormalities, such as otosclerosis or perforated eardrums, are causing conductive hearing loss, surgery may be necessary to correct or repair the affected area.
  • Hearing Aids: For individuals with permanent conductive hearing loss that cannot be corrected surgically, hearing aids can amplify sounds and improve hearing.
  • Bone-Anchored Hearing System (BAHS): BAHS devices are surgically implanted and conduct sound vibrations through the bones of the skull, bypassing the middle ear. They can be beneficial for certain types of conductive hearing loss.
  • Tympanoplasty: This surgical procedure aims to repair a perforated eardrum or damaged middle ear structures.

Outlook
The prognosis and outlook for conductive hearing loss are generally positive, especially when the condition is promptly diagnosed and treated. Many individuals with conductive hearing loss can expect significant improvement in their hearing and overall quality of life. It is essential to work closely with healthcare professionals to determine the underlying cause and develop a personalized treatment plan that addresses the specific needs of each individual.

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