8 Questions
What can cause conduction hearing loss?
A plug of wax
Which type of hearing loss is due to brain damage?
Central hearing loss
What is the frequency range of an audiometer?
250 to 8000 Hz
Which condition does NOT lead to nerve hearing loss?
Fluid in the middle ear
What is the range of decibels considered as severe hearing loss?
71-90 dB
Which of the following can cause conductive hearing loss?
Fluid in the middle ear
A patient with a hearing loss of 45 dB would be classified as having what degree of hearing loss?
Moderate hearing loss
What does an audiometer measure?
Degree of hearing loss
Study Notes
Hearing Loss (Deafness)
- Caused by changes at any level of the auditory system
Types of Hearing Loss
- Conduction hearing loss: impairment in sound transmission through the external or middle ear to the cochlea
- Nerve hearing loss: damage to hair cells in the cochlea or damage to the auditory nerve
- Central hearing loss: brain damage
Conduction Hearing Loss
- Affects the passage of sound between the ear drum and the inner ear
- Caused by:
- A plug of wax blocking the ear canal
- A hole in the eardrum
- Fluid in the middle ear
Nerve Hearing Loss
- Defined as damage to the hair cells in the cochlea or damage to the neural pathways of hearing (nerves)
Hearing Test (Audiometer)
- Uses an electronic instrument called an Audiometer
- Has a dial with a range of 0 to 120 dB (decibels) and a frequency range of 250 to 8000 Hz (Hertz)
- Tests patient's hearing for different frequencies and volumes to determine the degree of hearing loss
Degrees of Hearing Loss
- Normal Hearing: 0-25 dB
- Mild Hearing Loss: 26-40 dB
- Moderate Hearing Loss: 41-55 dB
- Moderately Severe Hearing Loss: 56-70 dB
- Severe Hearing Loss: 71-90 dB
- Profound Hearing Loss: 91+ dB
Explore the different types of hearing loss, including conduction, nerve, and central hearing loss, and their causes and effects on the auditory system.
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