Indications and Procedure of Pure Tone Audiometry
Interpretation of Audiometric Results
Pure Tone Audiometry is an essential hearing test used to diagnose hearing loss and guide treatment decisions. It involves assessing auditory thresholds and interpreting audiograms to determine hearing impairment severity.
Indications and Procedure of Pure Tone Audiometry
Introduction
Pure Tone Audiometry (PTA) is a fundamental hearing test used in otorhinolaryngology (ENT) to assess a patient’s auditory function. This test helps diagnose various types of hearing loss and determine the appropriate treatment approach.
Indications for Pure Tone Audiometry
- Assessing suspected hearing loss in patients
- Monitoring auditory function in individuals exposed to prolonged noise
- Evaluating candidates for hearing aids or cochlear implants
- Determining the effectiveness of otologic surgery
- Investigating tinnitus or ear-related disorders
Procedure of Pure Tone Audiometry
Preparation
The patient is seated in a soundproof booth, wearing calibrated headphones. The audiologist explains the test and ensures the patient is comfortable.
Test Process
- Pure tones of different frequencies (125 Hz to 8000 Hz) are presented to each ear.
- The patient signals detection by pressing a button or raising a hand.
- The lowest intensity level at which the patient perceives sound is recorded as the threshold.
- Results are plotted on an audiogram to analyze hearing sensitivity.
Interpretation of Audiometric Results
Types of Hearing Loss
- Conductive Hearing Loss: Abnormal air conduction but normal bone conduction.
- Sensorineural Hearing Loss: Impaired air and bone conduction.
- Mixed Hearing Loss: A combination of conductive and sensorineural components.
Audiogram Analysis
Results are classified based on hearing threshold levels:
- Normal hearing: 0-25 dB
- Mild hearing loss: 26-40 dB
- Moderate hearing loss: 41-55 dB
- Severe hearing loss: 56-70 dB
- Profound hearing loss: Above 71 dB
Conclusion
Pure Tone Audiometry is a crucial diagnostic tool for evaluating hearing impairment. Accurate interpretation of audiometric results allows healthcare professionals to determine the severity and type of hearing loss, guiding appropriate interventions.