Audiology and Speech Disorders Practice Questions

Q: What does the red line in pure tone audiometry represent?

Right ear air conduction. ***Right ear air conduction*** - In **pure tone audiometry**, the red line (often plotted with a red circle 'O') universally represents the **air conduction threshold** for the **right ear**. - This standardized convention allows for quick and accurate interpretation of audiograms across different clinical settings. *Bone conduction* - **Bone conduction** thresholds are typically represented by a bracket symbol (e.g., '>' for right ear, '<' for left ear) or a triangle ('△' for right ear, '□' for left ear) rather than a continuous red line. - It measures the hearing sensitivity of the inner ear, bypassing the outer and middle ear. *Air conduction* - While the red line does represent **air conduction**, it specifically denotes the **right ear's air conduction**. - **Air conduction** for the left ear is usually represented by a blue 'X'. *Left ear* - The **left ear's air conduction** is typically represented by a **blue line** with 'X' symbols, contrasting with the red line for the right ear. - **Left ear bone conduction** is usually shown with a blue unmasked bracket '<' or a masked blue square '□'.

Q: Lombard's test is used to diagnose?

Non-organic hearing loss. ***Non-organic hearing loss*** - Lombard's test is a specialized audiological test used to detect **non-organic hearing loss**, also known as **functional hearing loss** or **malingering**. - In a true hearing loss, individuals unconsciously raise their vocal intensity in the presence of noise (Lombard effect); if they do so, but claim not to hear, it suggests a non-organic component. *Conductive hearing loss* - This type of hearing loss involves problems with the **transmission of sound waves** through the outer or middle ear. - It is typically diagnosed using **audiometry**, **tympanometry**, and **otoscope examination**, not Lombard's test. *Sensorineural hearing loss* - This involves damage to the **inner ear** or the auditory nerve. - Diagnosed with **audiometry**, specifically by differences in air and bone conduction thresholds, and **otoacoustic emissions** or **auditory brainstem response** testing. *Mixed hearing loss* - Mixed hearing loss is a combination of both **conductive** and **sensorineural** components. - It would be identified by characteristics of both types on a standard audiogram, showing both air-bone gaps and elevated bone conduction thresholds.

Q: Hearing loss of 65dB, what is the grade of deafness?

Moderately severe. ***Moderately severe*** - A hearing loss of **65 dB** falls within the range defined as moderately severe. - The moderately severe range typically spans from **56 dB to 70 dB** in conventional audiometric classifications. *Mild* - **Mild hearing loss** is characterized by a threshold between **26 dB and 40 dB**. - Individuals with mild hearing loss may struggle with soft sounds or speech in noisy environments. *Moderate* - **Moderate hearing loss** is defined by a threshold between **41 dB and 55 dB**. - This level of loss causes difficulty understanding normal conversation without amplification. *Severe* - **Severe hearing loss** is characterized by a threshold between **71 dB and 90 dB**. - Individuals with severe hearing loss often require powerful hearing aids or other assistive listening devices.

Q: In unilateral sensorineural hearing loss, which ear does Weber's test lateralize to?

Uninvolved ear. ***Uninvolved ear*** - In **sensorineural hearing loss**, the affected inner ear or auditory nerve cannot properly conduct sound, so the sound vibrations from the tuning fork are perceived more strongly by the **healthy ear**. - This occurs because the sound transmits through the skull directly to the **cochlea**, and the normal ear then perceives this sound without the interference of a conductive block. *Affected ear* - If the sound lateralized to the affected ear, it would suggest a **conductive hearing loss** in that ear, where the sound transmission through air is impaired, allowing bone conduction to be more prominent. - In sensorineural loss, the issue is with the neural processing, not with the mechanical conduction to the inner ear. *Not lateralized* - If the sound is perceived equally in both ears, it usually indicates either **normal hearing** in both ears or **bilateral symmetrical hearing loss**. - In unilateral sensorineural hearing loss, there is a clear physiological reason for the sound to be louder in the unaffected ear. *May alternate* - **Alternating lateralization** is not a typical finding in the standard Weber test for a single, unilateral hearing deficit. - It could suggest an inconsistent test performance or complex bilateral conditions, rather than a clear unilateral sensorineural loss.

Q: Which of the following is the best tuning fork to perform Rinne's and Weber's tests?

512 Hz. ***512 Hz*** - A **512 Hz tuning fork** is considered ideal for both Rinne's and Weber's tests because its frequency falls within the **speech frequency range**, which is clinically relevant for detecting hearing loss. - This frequency also produces an optimal tone that is **sustained long enough** to perform the tests accurately, without being too low (which can cause vibratory sensation) or too high (which decays too quickly). *128 Hz* - Tuning forks with **lower frequencies** like 128 Hz are more likely to be perceived as a **vibration sensation** rather than pure sound, especially during bone conduction, which can lead to inaccurate test results. - While useful for testing **vibratory sensation** in neurological exams, it is not preferred for distinguishing between air and bone conduction in hearing tests. *256 Hz* - Although it produces a clear tone, a **256 Hz tuning fork** can still introduce some degree of **vibratory sensation**, potentially confusing test interpretation, especially in bone conduction. - The **512 Hz fork** offers a better balance between sound clarity and minimal vibratory sensation for hearing assessment. *1024 Hz* - A **1024 Hz tuning fork** produces a high-frequency tone that tends to **decay too quickly**, making it difficult to accurately compare air and bone conduction times, especially in the Weber test. - While useful for testing higher frequencies, its **short sustain time** makes it less practical for the comparative nature of Rinne's and Weber's tests.

Q: Which device is depicted below?

Cochlear implant. ***Cochlear implant*** - A cochlear implant is an **electronic medical device that replaces the function of a damaged inner ear (cochlea)** and provides sound signals directly to the brain - On imaging (X-ray, CT, or skull radiograph), it appears as a **characteristic circular receiver-stimulator device** under the skin behind the ear with an **electrode array extending into the cochlea** - The **internal receiver has a distinctive appearance** with visible magnets and electrode contacts, making it easily identifiable on radiographic images - Used for patients with **severe to profound sensorineural hearing loss** who do not benefit from conventional hearing aids *Auditory brainstem implant (ABI)* - An ABI **bypasses both the cochlea and auditory nerve**, directly stimulating the **cochlear nucleus in the brainstem** - On imaging, the electrode array would be located at the **cerebellopontine angle** near the brainstem, not in the cochlea - Reserved for patients with **absent or non-functional auditory nerves** (e.g., bilateral vestibular schwannomas, neurofibromatosis type 2) *Bone anchored hearing aid (BAHA)* - A BAHA consists of a **titanium implant osseointegrated into the skull bone** behind the ear with an external sound processor - On X-ray, only the **small titanium fixture/abutment** would be visible in the mastoid bone, without any cochlear or intracranial components - Works by **bone conduction**, transmitting sound vibrations directly to the inner ear, bypassing the outer and middle ear - Used for **conductive hearing loss, mixed hearing loss, or single-sided deafness** *Hearing aid* - A conventional hearing aid is a **completely external electronic device** that amplifies sound - It would **not be visible on X-ray or CT imaging** as it contains no implanted components - Simply amplifies sound for individuals with mild to moderate hearing loss

Q: To distinguish between cochlear and post-cochlear damage, which test is done?

Auditory brainstem response (ABR). ***Auditory brainstem response (ABR)*** - This test evaluates the integrity of the **auditory pathway from the cochlea through the brainstem**, making it excellent for differentiating between cochlear (sensory) and post-cochlear (retrocochlear/neural) lesions. - Abnormalities in wave latencies or interpeak intervals suggest **retrocochlear pathology** (e.g., acoustic neuroma), while normal ABR responses despite hearing loss point towards cochlear damage. - ABR records **five characteristic waves (I-V)** representing neural transmission from the auditory nerve through the brainstem. *Impedance audiometry* - Primarily assesses the **middle ear function**, including the eardrum and ossicles, by measuring **tympanic membrane compliance** and **acoustic reflexes**. - It does not directly evaluate the function of the **cochlea or the retrocochlear pathways**, making it unsuitable for this differentiation. *Pure tone audiometry* - Measures a person's **hearing sensitivity** at different frequencies and provides information on the **degree and type of hearing loss (conductive, sensorineural, or mixed)**. - While it identifies sensorineural hearing loss, it cannot pinpoint whether the damage is **cochlear or retrocochlear** within the sensorineural category. *Electrocochleography (ECochG)* - Records **electrical potentials generated by the cochlea and auditory nerve** in response to sound, including **cochlear microphonics, summating potentials, and compound action potentials**. - While it evaluates cochlear function and is useful in diagnosing **Meniere's disease** and **auditory neuropathy**, it does not adequately assess the **integrity of the brainstem auditory pathways** needed to differentiate retrocochlear lesions.

Q: A 45-year-old gentleman reports decreased hearing in the right ear for the last two years. On testing with a 512 Hz tuning fork, the Rinne's test without masking is negative on the right ear and positive on the left ear. With the Weber's test, the tone is perceived as louder in the left ear. Patient most likely has -

Right conductive hearing loss. ***Right conductive hearing loss*** - A **negative Rinne's test** (bone conduction louder than air conduction) in the right ear indicates **conductive hearing loss** on that side - However, in true conductive hearing loss, **Weber should lateralize to the affected (right) ear** due to the occlusion effect, not to the left ear - The Weber lateralizing to the left ear with a negative Rinne on the right suggests this may be a **false negative Rinne** due to lack of masking, where sound crosses over to the better left ear - This combination is atypical for pure conductive loss and requires repeat testing with proper masking *Right sensorineural hearing loss* - In **sensorineural hearing loss**, Rinne's test should be **positive** (air conduction > bone conduction) on both sides, though both may be reduced on the affected side - **Weber lateralizes to the unaffected (left) ear**, which matches the given finding - The **negative Rinne on the right ear without masking** is likely a **false negative** due to sound crossing over to the better left ear during bone conduction testing - This is the **most consistent interpretation** when Rinne testing is done without masking, but traditionally the question frame suggests conductive loss *Left sensorineural hearing loss* - Would show **positive Rinne bilaterally** with reduced hearing on the left - **Weber would lateralize to the right ear** (the better ear), contradicting the given findings - This option is clearly inconsistent with the clinical findings *Left conductive hearing loss* - Would show **negative Rinne on the left** and positive on the right - Weber would lateralize to the left ear (affected side in conductive loss) - The **Rinne findings contradict this**, as the right ear shows negative Rinne, not the left

Q: Which of the following tests assesses resistance in the middle ear?

Impedance audiometry. ***Impedance audiometry*** - This test measures the **impedance** (resistance) of the middle ear and the mobility of the **tympanic membrane** and **ossicular chain** - It also assesses the **acoustic reflex**, which is the contraction of the middle ear muscles in response to loud sound, providing information about the middle ear and auditory pathways *Pure tone audiometry* - This test measures an individual's **hearing sensitivity** across different frequencies - It assesses the **thresholds of hearing** for air conduction and bone conduction, but does not directly measure middle ear resistance *Caloric test* - The caloric test evaluates the function of the **vestibular system** and the **horizontal semicircular canal** - It involves introducing warm or cold water/air into the ear canal to induce nystagmus, but does not assess middle ear resistance *BERA (Brainstem evoked response audiometry)* - BERA measures the **electrical activity** in the auditory pathway from the cochlea to the brainstem in response to auditory stimuli - It is used to assess hearing in infants, differentiate between **sensory** and **neural hearing loss**, and detect neurological disorders, but does not measure middle ear impedance

Question 1

What does the red line in pure tone audiometry represent?

Accepted Answer

Right ear air conduction

Answer

Bone conduction

Answer

Air conduction

Answer

Left ear

Question 2

Lombard's test is used to diagnose?

Accepted Answer

Non-organic hearing loss

Answer

Conductive hearing loss

Answer

Sensorineural hearing loss

Answer

Mixed hearing loss

Question 3

Hearing loss of 65dB, what is the grade of deafness?

Accepted Answer

Moderately severe

Answer

Mild

Answer

Moderate

Answer

Severe

Question 4

In unilateral sensorineural hearing loss, which ear does Weber's test lateralize to?

Accepted Answer

Uninvolved ear

Answer

Affected ear

Answer

Not lateralized

Answer

May alternate

Question 5

Which of the following is the best tuning fork to perform Rinne's and Weber's tests?

Accepted Answer

512 Hz

Answer

128 Hz

Answer

256 Hz

Answer

1024 Hz

Question 6

Which device is depicted below?

Accepted Answer

Cochlear implant

Answer

Auditory brainstem implant (ABI)

Answer

Bone anchored hearing aid (BAHA)

Answer

Hearing aid

Question 7

To distinguish between cochlear and post-cochlear damage, which test is done?

Accepted Answer

Auditory brainstem response (ABR)

Answer

Impedance audiometry

Answer

Pure tone audiometry

Answer

Electrocochleography (ECochG)

Question 8

A 45-year-old gentleman reports decreased hearing in the right ear for the last two years. On testing with a 512 Hz tuning fork, the Rinne's test without masking is negative on the right ear and positive on the left ear. With the Weber's test, the tone is perceived as louder in the left ear. Patient most likely has -

Accepted Answer

Right conductive hearing loss

Answer

Right sensorineural hearing loss

Answer

Left sensorineural hearing loss

Answer

Left conductive hearing loss

Question 9

Which of the following tests assesses resistance in the middle ear?

Accepted Answer

Impedance audiometry

Answer

Pure tone audiometry

Answer

Caloric test

Answer

BERA (Brainstem evoked response audiometry)

Question 10

What is the primary purpose of the Bing test in audiology?

Accepted Answer

Determining the effect of ear canal occlusion on sound conduction

Answer

Assessing overall hearing ability through audiometry

Answer

Evaluating sound conduction through air

Answer

A general term for various hearing assessments

Audiology and Speech Disorders — MCQs

Audiology and Speech Disorders — MCQs

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