Audiology and Speech Disorders Practice Questions

Q: Electrode of cochlear implant is placed in:

Scala tympani. ***Scala tympani*** - The electrode array of a **cochlear implant** is carefully inserted into the **scala tympani** of the cochlea. - This placement allows the electrodes to directly stimulate the **spiral ganglion neurons**, bypassing damaged hair cells and transmitting electrical signals to the auditory nerve. *Horizontal semicircular canal* - The **horizontal semicircular canal** is part of the **vestibular system**, responsible for sensing angular head movements, not hearing. - Placing an electrode here would cause **vestibular dysfunction** and would not restore hearing. *Scala media* - The **scala media** (cochlear duct) contains the **organ of Corti** and **endolymph**, which has a high potassium concentration. - Inserting an electrode here would damage the delicate structures essential for natural sound transduction and could lead to electric potential imbalances. *Scala vestibuli* - The **scala vestibuli** is filled with **perilymph** and receives sound vibrations from the stapes. - While it's adjacent to the scala tympani, the **scala tympani** offers a safer and more direct path for optimal electrode insertion with less trauma to the sensory structures.

Q: What is a specific indication for the use of a Bone-Anchored Hearing Aid (BAHA)?

Congenital canal atresia. ***Congenital canal atresia*** - **Congenital canal atresia** represents a classic, specific indication for BAHA because the ear canal is congenitally absent or severely stenosed, making conventional hearing aids impossible to fit or ineffective. - BAHA bypasses the absent ear canal entirely by transmitting sound vibrations directly to the **cochlea through bone conduction**, providing an ideal solution for this anatomical abnormality. *Bilateral conductive hearing loss* - While BAHA can be used for conductive hearing loss, **conventional hearing aids** are typically the first-line treatment when ear canals are intact and functional. - Bilateral cases often benefit from traditional amplification devices or **surgical correction** of the underlying conductive pathology before considering BAHA. *Unilateral sensorineural hearing loss* - BAHA is commonly used for **single-sided deafness (SSD)** to route sound from the deaf ear to the hearing ear via bone conduction using the **CROS principle**. - However, this indication is less specific than congenital canal atresia, as other treatment options like **conventional CROS hearing aids** may also be considered. *Conductive hearing loss due to other causes* - This option is too **broad and non-specific** as it encompasses many different etiologies of conductive hearing loss. - Many other causes of conductive hearing loss have **alternative treatments** such as surgical repair, conventional hearing aids, or medical management, making BAHA a secondary consideration.

Q: Hyperacusis is defined as:

Normal sounds perceived as loud and painful. ***Normal sounds perceived as loud and painful*** - **Hyperacusis** is a condition where everyday environmental sounds are perceived as abnormally loud, annoying, frightening, or painful. - This symptom can arise from various etiologies, including **head trauma**, **Lyme disease**, **TMJ dysfunction**, or certain **medications**. *Hearing of only loud sound* - This describes a form of **hearing loss** where only sounds above a certain intensity can be perceived, which is the opposite of hyperacusis. - It does not involve the perception of normal sounds as painfully loud. *Completely deaf* - **Complete deafness** refers to the total inability to hear any sounds. - This is a state of profound hearing loss and is distinct from hyperacusis, where sound is heard but perceived abnormally. *Ability to hear in noisy surroundings* - This capability is associated with normal or excellent **auditory processing** and is not indicative of hyperacusis. - Individuals with hyperacusis often find noisy environments unbearable due to the exaggerated perception of sound.

Q: Most commonly used tuning fork in ear examination?

512 Hz. ***512 Hz*** - The **512 Hz tuning fork** is the most commonly recommended and used for auditory tests like **Rinne** and **Weber** because its vibratory decay is slow enough to allow adequate testing, and it falls within the **speech frequency range**. - Its frequency is optimal for assessing both **bone conduction** and **air conduction** without introducing confusing overtones or being too low to be felt as a vibration rather than heard as a tone. *128 Hz* - A **128 Hz tuning fork** produces a strong vibratory sensation and is primarily used for **neurological examinations** to test **vibration sense**, not typically for ear examinations. - Its low frequency can be easily perceived as a **tactile vibration** through bone, making it less ideal for purely auditory assessment. *256 Hz* - While it falls within the audible range, a **256 Hz tuning fork** is less commonly used than 512 Hz for standard hearing tests. - Its vibratory tone may have a faster decay and might not provide as clear a distinction for **bone conduction** as the 512 Hz fork. *1024 Hz* - A **1024 Hz tuning fork** is a higher frequency tone, which may decay too quickly for accurate **Rinne and Weber tests**, especially when assessing subtle differences in hearing. - While audible, its higher pitch can be less representative of the critical **speech frequencies** typically evaluated in basic hearing screenings.

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: 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: 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: Which of the following conditions is least likely to be associated with sensorineural hearing loss (SNHL)?

Distal renal tubular acidosis. ***Distal renal tubular acidosis*** - While dRTA is associated with various systemic abnormalities like **nephrolithiasis** and **osteomalacia**, **sensorineural hearing loss (SNHL)** is **not a typical feature** of this condition. - The primary defect in dRTA is impaired acid secretion in the distal tubules, leading to **metabolic acidosis**. *Bartter syndrome* - This is a rare genetic disorder affecting the thick ascending limb of the loop of Henle, leading to **salt wasting** and **hypokalemia**. - **SNHL** has been reported in certain variants of Bartter syndrome, particularly in those with mutations affecting the **NKCC2 transporter** or other associated genes. *Alport syndrome* - A well-known genetic disorder characterized by **glomerulonephritis**, **SNHL**, and ocular abnormalities. - The SNHL in Alport syndrome is typically **bilateral and progressive**, often beginning in childhood. *Nail-patella syndrome* - This is an autosomal dominant disorder primarily affecting the **nails**, **kneecaps**, elbows, and kidneys, with about 30-50% of affected individuals developing **renal disease**. - **SNHL** is a recognized, albeit less common, manifestation of Nail-patella syndrome, thought to be related to abnormalities in the **collagen IV** network in the cochlea.

Q: Which of the following statements about Rinne's test is false?

Positive in conductive hearing loss. ***Positive in conductive hearing loss*** - In **conductive hearing loss**, bone conduction is heard better or longer than air conduction, resulting in a **negative Rinne test**. - A positive Rinne test indicates that **air conduction is better than bone conduction**, which is typically found in normal ears or those with sensorineural hearing loss. *Positive in normal ear* - A **positive Rinne test** (air conduction > bone conduction) is the expected finding in an ear with **normal hearing**. - This reflects the more efficient sound transmission through the **ossicular chain** and external auditory canal. *Bone conduction is better in conductive hearing loss* - In **conductive hearing loss**, sound transmission through the external or middle ear is impaired, making **bone conduction relatively better** than air conduction. - This phenomenon is what defines a **negative Rinne test** in conductive hearing loss. *Minimum 15-20 dB air-bone gap is required in conductive deafness* - An **air-bone gap of 15-20 dB** or more on audiometry is generally considered clinically significant for diagnosing **conductive hearing loss**. - This gap indicates that sound heard via air conduction is significantly poorer than sound heard via bone conduction.

Question 1

What is the purpose of Rinne's test?

Accepted Answer

To differentiate between conductive and sensorineural hearing loss

Answer

To measure the degree of hearing loss in decibels

Answer

To assess the patency of the Eustachian tube

Answer

To test the function of the vestibular system

Question 2

Electrode of cochlear implant is placed in:

Accepted Answer

Scala tympani

Answer

Horizontal semicircular canal

Answer

Scala media

Answer

Scala vestibuli

Question 3

What is a specific indication for the use of a Bone-Anchored Hearing Aid (BAHA)?

Accepted Answer

Congenital canal atresia

Answer

Bilateral conductive hearing loss

Answer

Unilateral sensorineural hearing loss

Answer

Conductive hearing loss due to other causes

Question 4

Hyperacusis is defined as:

Accepted Answer

Normal sounds perceived as loud and painful

Answer

Hearing of only loud sound

Answer

Completely deaf

Answer

Ability to hear in noisy surroundings

Question 5

Most commonly used tuning fork in ear examination?

Accepted Answer

512 Hz

Answer

128 Hz

Answer

256 Hz

Answer

1024 Hz

Question 6

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 7

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 8

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 9

Which of the following conditions is least likely to be associated with sensorineural hearing loss (SNHL)?

Accepted Answer

Distal renal tubular acidosis

Answer

Bartter syndrome

Answer

Alport syndrome

Answer

Nail-patella syndrome

Question 10

Which of the following statements about Rinne's test is false?

Accepted Answer

Positive in conductive hearing loss

Answer

Bone conduction is better in conductive hearing loss

Answer

Positive in normal ear

Answer

Minimum 15-20 dB air-bone gap is required in conductive deafness

Audiology and Speech Disorders — MCQs

Audiology and Speech Disorders — MCQs

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