Audiology and Speech Disorders Practice Questions

Q: Brainstem Evoked Response Audiometry (BERA) can be most accurately performed from which gestational age?

34 weeks. **Explanation:** Brainstem Evoked Response Audiometry (BERA), also known as ABR, is an objective electrophysiological test used to assess the integrity of the auditory pathway from the cochlear nerve to the brainstem. **Why 34 weeks is correct:** The auditory system undergoes significant maturation during the third trimester. While the inner ear (cochlea) reaches adult size by 20 weeks of gestation, the **myelination** of the auditory nerve and the brainstem pathways—essential for conducting electrical impulses—is only sufficiently developed to produce a consistent, reproducible, and interpretable BERA waveform by **34 weeks of gestation**. Before this period, the waves are often absent, inconsistent, or have excessively prolonged latencies. **Analysis of Incorrect Options:** * **28 & 30 weeks:** At this stage, the fetus may show a startle response to loud sounds, but the neural pathways are too immature (lack of myelination) to yield a reliable BERA recording. * **32 weeks:** While some rudimentary waves may appear, they are often unstable. 34 weeks is the clinically accepted threshold for "accurate" and standardized testing. **High-Yield Clinical Pearls for NEET-PG:** * **Waveforms:** BERA consists of 7 waves, but **Waves I, III, and V** are the most clinically significant. * **Wave V:** This is the most robust wave and is used to determine the **hearing threshold** (the lowest intensity at which Wave V is visible). * **Site of Origin:** Wave I (Distal 8th Nerve), Wave II (Proximal 8th Nerve), Wave III (Cochlear Nucleus), Wave IV (Superior Olivary Complex), Wave V (Lateral Lemniscus/Inferior Colliculus). * **Indications:** Newborn hearing screening (gold standard), diagnosing acoustic neuroma (retrocochlear lesions), and determining hearing thresholds in uncooperative patients.

Q: What is the screening investigation for suspected hearing loss in high-risk neonates admitted to the ICU?

Otoacoustic emissions. **Explanation:** The screening of neonates for hearing loss, especially those in the High-Risk Nursery or NICU, follows a specific protocol aimed at early detection (the "1-3-6" rule). **1. Why Otoacoustic Emissions (OAE) is correct:** OAEs are the gold standard for initial screening because they are **objective, non-invasive, and rapid**. They measure the sounds generated by the outer hair cells of the cochlea in response to auditory stimuli. In a screening setup, a "Pass" indicates functional outer hair cells and a clear conductive path, while a "Refer" indicates the need for further testing (usually BERA/AABR). **2. Why other options are incorrect:** * **Free field audiometry:** This is a subjective behavioral test used for older infants (6 months to 2 years) who can localize sound. It is unreliable in neonates. * **Stapedial reflex testing:** While it tests the integrity of the auditory pathway, it is not a screening tool for hearing thresholds and can be difficult to elicit in neonates due to ear canal compliance. * **Pure tone audiometry (PTA):** This is the gold standard for adults and older children (usually >5 years) as it requires active patient cooperation and feedback, which is impossible for a neonate. **Clinical Pearls for NEET-PG:** * **The 1-3-6 Rule:** Screening by **1** month, Diagnosis by **3** months, and Intervention (hearing aids/rehab) by **6** months. * **High-Risk Screening:** For NICU babies, **Automated BERA (AABR)** is often preferred over OAE because it can detect **Auditory Neuropathy Spectrum Disorder (ANSD)**, which OAE might miss (as OAE only tests cochlear function, not the auditory nerve). However, OAE remains the standard first-line screening tool in general protocols. * **OAE Types:** Transient Evoked OAE (TEOAE) is most commonly used for screening. OAEs are absent if there is a conductive loss or if sensory hearing loss exceeds 30-40 dB.

Q: What is the most common cause of sensorineural hearing loss in adults?

Presbycusis. **Explanation:** **Presbycusis** (Age-related sensorineural hearing loss) is the correct answer because it is the most common cause of sensorineural hearing loss (SNHL) in the adult population worldwide. It is a progressive, bilateral, symmetrical high-frequency SNHL resulting from degenerative changes in the inner ear (specifically the hair cells of the Organ of Corti and the stria vascularis) as a person ages. **Analysis of Incorrect Options:** * **Meniere’s Disease:** While a significant cause of SNHL, it is characterized by a classic triad of episodic vertigo, tinnitus, and fluctuating low-frequency hearing loss. It is far less prevalent than age-related degeneration. * **Otosclerosis:** This condition typically causes **conductive hearing loss** due to stapes fixation. While "Sensory Otosclerosis" can occur, it is not the primary presentation nor the most common cause of SNHL in adults. * **Osteenic Osteoarthritis:** This is not a standard clinical term associated with hearing loss. It likely serves as a distractor related to general degenerative bone diseases which do not typically cause SNHL. **High-Yield Clinical Pearls for NEET-PG:** * **Schuknecht’s Classification:** Presbycusis is divided into four types: Sensory (loss of hair cells), Neural (loss of spiral ganglion cells), Metabolic/Strial (atrophy of stria vascularis—shows a flat audiogram), and Cochlear Conductive (stiffening of the basilar membrane). * **Audiometry Finding:** Typically shows a **sloping, symmetrical high-frequency SNHL**. * **Roll-over Phenomenon:** Patients often have a disproportionately low Speech Discrimination Score (SDS) compared to their Pure Tone Average (PTA), especially in noisy environments. * **Management:** The primary treatment is the use of bilateral **hearing aids** or, in severe cases, cochlear implants.

Q: "Boiler's notch" is suggestive of which type of hearing loss?

Noise-Induced Hearing Loss (NIHL). ### Explanation **1. Why the Correct Answer is Right:** "Boiler's notch" is a classic audiometric finding characteristic of **Noise-Induced Hearing Loss (NIHL)**. It refers to a sensorineural hearing loss that typically occurs at the **4000 Hz (4 kHz)** frequency. The underlying medical concept involves the anatomy of the cochlea. The hair cells located in the basal turn of the cochlea, specifically those sensitive to the 4 kHz range, are most susceptible to acoustic trauma. This is due to the resonance characteristics of the external auditory canal (which amplifies frequencies between 2-4 kHz) and the specific vascular supply of that region. On an audiogram, this appears as a "dip" or "notch" at 4 kHz, with recovery at higher frequencies (6-8 kHz). **2. Why the Incorrect Options are Wrong:** * **Conductive Hearing Loss (CHL):** This involves pathologies of the external or middle ear (e.g., ASOM, Otosclerosis). It is characterized by an "Air-Bone Gap" on the audiogram, not a specific frequency notch at 4 kHz. (Note: Otosclerosis shows a notch at 2 kHz, known as *Carhart’s Notch*). * **Normal Finding:** A normal audiogram shows both air and bone conduction thresholds between 0-25 dB across all frequencies without any significant dips or notches. **3. Clinical Pearls for NEET-PG:** * **Carhart’s Notch:** Seen in **Otosclerosis** at **2000 Hz** (Bone conduction dip). * **Boiler's Notch:** Seen in **NIHL** at **4000 Hz** (Air and Bone conduction dip). * **Acoustic Trauma:** Permanent damage can occur with a single exposure to sound >140 dB or chronic exposure to >85 dB. * **Presbycusis:** Age-related hearing loss; presents as a sloping high-frequency sensorineural hearing loss (no notch). * **Management:** NIHL is irreversible; hence, prevention using earplugs or earmuffs is the gold standard.

Q: Middle ear effusion with an intact eardrum gives rise to which type of tympanogram?

Type B. **Explanation:** Tympanometry measures the compliance of the middle ear system as air pressure in the external auditory canal is varied. In **Middle Ear Effusion (Otitis Media with Effusion)**, the presence of fluid behind an intact eardrum prevents the tympanic membrane from vibrating, regardless of the pressure applied. **1. Why Type B is Correct:** * **Type B (Flat Tympanogram):** This indicates a non-compliant (stiff) system. Because fluid is incompressible, there is no point of maximum compliance, resulting in a flat line. * **Clinical Correlation:** When seen with a **normal ear canal volume**, it signifies middle ear effusion. If seen with a **large volume**, it suggests a TM perforation or a patent grommet. **2. Analysis of Incorrect Options:** * **Type A (Normal):** Shows a sharp peak at atmospheric pressure (0 daPa). This indicates normal middle ear pressure and mobility. * **Type C (Negative Pressure):** The peak is shifted to the left (more negative than -100 to -150 daPa). This indicates **Eustachian tube dysfunction**, often a precursor to effusion, but not the effusion itself. * **Type D (W-shaped):** Also known as a "notched" tympanogram, it is typically seen in conditions of hyper-mobility, such as **ossicular discontinuity** or a scarred/monomeric tympanic membrane. **High-Yield Clinical Pearls for NEET-PG:** * **Type As (S = Stiff):** Low peak height; seen in **Otosclerosis** or tympanosclerosis. * **Type Ad (D = Discontinuity/Deep):** Very high peak; seen in **Ossicular Disconnection**. * **Gold Standard:** While tympanometry is the most objective screening tool for effusion, **Pneumatic Otoscopy** remains the clinical gold standard for diagnosis.

Q: All of the following are tuning fork tests to differentiate hearing loss, EXCEPT:

Burn's test. The correct answer is **Burn’s test** because it is not a tuning fork test; rather, it is a clinical test used to identify **malingering** (non-organic hearing loss). In this test, a patient is asked to perform a simple task, such as repeating words or numbers, while a loud noise is suddenly introduced. A malingerer will often stop talking or show hesitation, inadvertently proving they can hear the background noise. ### Explanation of Options: * **Rinne Test:** The most common tuning fork test. It compares **Air Conduction (AC)** with **Bone Conduction (BC)**. In normal hearing or sensorineural hearing loss (SNHL), AC > BC (Rinne positive). In conductive hearing loss (CHL), BC > AC (Rinne negative). * **Schwabach Test:** Compares the patient's BC with the examiner's BC (assuming the examiner has normal hearing). In CHL, the patient hears the sound longer than the examiner (prolonged Schwabach). In SNHL, the patient hears it for a shorter duration (shortened Schwabach). * **Gelle’s Test:** Used to check the mobility of the ossicular chain, specifically for **Otosclerosis**. Using a Siegle’s speculum to increase ear canal pressure, a normal ear will perceive a decrease in sound intensity. In Otosclerosis (fixed stapes), there is no change in sound (Gelle’s negative). ### High-Yield Clinical Pearls for NEET-PG: * **Tuning Fork Frequency:** 512 Hz is the gold standard for clinical testing as it provides the best balance between bone conduction and tactile vibration. * **Weber Test:** A lateralization test. Sound lateralizes to the **poorer ear in CHL** and to the **better ear in SNHL**. * **Bing Test:** Tests the occlusion effect. If closing the ear canal doesn't make the sound louder, it indicates CHL. * **Stenger Test:** Another high-yield test for **unilateral malingering**.

Q: Carha's notch in audiometry is seen in which condition?

Otosclerosis. **Explanation:** **Otosclerosis** is the correct answer. Carhart’s notch is a classic audiometric finding in patients with otosclerosis. It is a **false dip in the bone conduction (BC) threshold**, most prominent at **2000 Hz**. The underlying mechanism is the loss of the "inertial component" of bone conduction. Normally, the vibration of the ossicles contributes to bone conduction sensitivity. In otosclerosis, stapes fixation disrupts these normal resonance frequencies (specifically around 2 kHz). It is termed a "false" dip because the cochlear reserve is actually normal; following a successful stapedotomy, this notch typically disappears. **Analysis of Incorrect Options:** * **Ossicular discontinuity:** Typically presents with a significant air-bone gap (often >40-50 dB) and a hypermobile tympanic membrane (Type Ad tympanogram), but does not feature a specific BC notch at 2 kHz. * **Haemotympanum:** This results in a conductive hearing loss due to fluid (blood) in the middle ear, leading to a flat or rising audiogram, not a localized BC notch. * **Otomycosis:** This is a fungal infection of the external auditory canal. It may cause a mild conductive loss due to debris/obstruction but does not affect bone conduction thresholds. **High-Yield Clinical Pearls for NEET-PG:** * **Schwartze Sign:** A flamingo-pink flush seen on the promontory through the TM (indicates active otosclerosis). * **Tympanometry:** Typically shows a **Type As** (shallow) curve due to increased stiffness of the ossicular chain. * **Gelle’s Test:** Negative in otosclerosis (no change in hearing with increased ear canal pressure). * **Treatment of Choice:** Stapedotomy with prosthesis insertion.

Q: In noise-induced hearing loss, the audiogram typically shows a dip (Boiler's notch) at which frequency?

4000 Hz. ### Explanation **1. Why 4000 Hz is Correct:** Noise-induced hearing loss (NIHL) typically presents with a characteristic sensorineural hearing loss dip, known as **Acoustic Notch** or **Boiler’s Notch**. This occurs most prominently at **4000 Hz**. The underlying medical concept is based on the **Acoustic Reflex** and the anatomy of the external auditory canal. The ear canal has a natural resonant frequency of approximately 3000 Hz. When exposed to loud noise, this resonance amplifies the sound energy. Due to the hydrodynamics of the cochlea, the maximum shearing force occurs about half an octave above the resonant frequency, specifically damaging the hair cells in the basal turn of the cochlea corresponding to 4000 Hz. **2. Analysis of Incorrect Options:** * **1000 Hz (Option A):** This is a low-to-mid frequency. NIHL characteristically spares lower frequencies in the early stages. * **2000 Hz (Option B):** While damage can spread here in advanced cases, it is not the site of the initial "notch." A dip at 2000 Hz is more characteristic of **Carhart’s Notch**, seen in Otosclerosis (specifically in bone conduction). * **3000 Hz (Option C):** Although the notch can begin at 3000 Hz or extend to 6000 Hz, 4000 Hz remains the classic, most frequently tested, and most severe point of the dip in NIHL. **3. Clinical Pearls for NEET-PG:** * **Symmetry:** NIHL is almost always **bilateral and symmetrical**. * **Early Sign:** The earliest sign is the loss of the acoustic reflex at high frequencies. * **Preservation:** Speech frequencies (500–2000 Hz) are usually preserved until the late stages. * **Management:** It is irreversible; hence, prevention (earplugs/muffs) is the primary management strategy. * **Differentiate:** Do not confuse Boiler's Notch (4000 Hz) with Carhart's Notch (2000 Hz in Otosclerosis) or the 6000 Hz dip sometimes seen in head trauma.

Q: Which virus causes acute onset sensorineural deafness?

Rubella, measles. **Explanation:** The correct answer is **Rubella and Measles**. Viral infections are a leading cause of sudden or congenital sensorineural hearing loss (SNHL) due to their ability to directly damage the delicate structures of the inner ear (stria vascularis, organ of Corti) or the auditory nerve. * **Rubella:** Classically associated with **Congenital Rubella Syndrome**, it causes profound, bilateral SNHL. The virus affects the development of the inner ear during the first trimester. * **Measles (Rubeola):** Known to cause severe, permanent, bilateral SNHL. It typically results in **labyrinthitis**, leading to the destruction of the hair cells in the cochlea. **Analysis of Options:** * **Mumps (Option C):** While Mumps is a very common cause of viral SNHL, it typically presents as **unilateral** deafness. In the context of "acute onset" and general viral etiology in competitive exams, Rubella and Measles are frequently grouped as the primary systemic causes of bilateral SNHL. * **Coronavirus & Adenovirus (Options A & D):** While some case reports link COVID-19 to sudden SNHL, these are not classic or high-yield associations compared to the childhood exanthematous viruses. Adenoviruses primarily cause upper respiratory infections and conjunctivitis, rarely affecting the inner ear. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of unilateral SNHL in children:** Mumps. * **Most common cause of congenital viral SNHL:** Cytomegalovirus (CMV). * **Pathology:** Viral SNHL usually results in "Endolymphatic Labyrinthitis." * **Ramsay Hunt Syndrome:** Caused by Herpes Zoster Oticus; presents with SNHL, facial palsy, and vesicles on the pinna.

Q: Wave V in Brainstem Evoked Response Audiometry (BERA) typically corresponds to which neural pathway or structure?

Lateral lemniscus. **Explanation:** Brainstem Evoked Response Audiometry (BERA) is an objective electrophysiological test that records the electrical activity of the auditory pathway from the auditory nerve to the brainstem within the first 10 milliseconds of a sound stimulus. It consists of seven waves, with the first five being the most clinically significant. **Why Option B is Correct:** Wave V is the most robust and clinically reliable wave in BERA. It is primarily generated by the **Lateral Lemniscus** (specifically its termination) and the **Inferior Colliculus**. While both structures contribute, standard NEET-PG curriculum and classic texts (like Dhingra) traditionally associate Wave V with the Lateral Lemniscus. **Why Other Options are Incorrect:** * **Option D (Eighth nerve):** Wave I and Wave II correspond to the auditory nerve. Wave I arises from the distal (peripheral) portion, while Wave II arises from the proximal (central) portion. * **Option C (Cochlear nucleus):** Wave III is generated by the Cochlear Nucleus. * **Option A (Inferior colliculus):** While the Inferior Colliculus contributes to Wave V, it is more specifically associated with the transition from Wave V to Wave VI. In the context of this question, Lateral Lemniscus is the preferred anatomical marker for Wave V. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic (E-COLI):** **E**ighth Nerve (I, II), **C**ochlear Nucleus (III), **O**livary Complex (IV), **L**ateral Lemniscus (V), **I**nferior Colliculus (VI/VII). * **Clinical Utility:** BERA is the "Gold Standard" for screening hearing in infants and for diagnosing Retrocochlear pathology (e.g., Vestibular Schwannoma). * **Key Parameter:** The **I-V Interpeak Latency** is the most important value for detecting retrocochlear lesions; a delay suggests a tumor or demyelination.

Question 1

Brainstem Evoked Response Audiometry (BERA) can be most accurately performed from which gestational age?

Accepted Answer

34 weeks

Answer

30 weeks

Answer

32 weeks

Answer

28 weeks

Question 2

What is the screening investigation for suspected hearing loss in high-risk neonates admitted to the ICU?

Accepted Answer

Otoacoustic emissions

Answer

Free field audiometry

Answer

Stapedial reflex testing

Answer

Pure tone audiometry

Question 3

What is the most common cause of sensorineural hearing loss in adults?

Accepted Answer

Presbycusis

Answer

Meniere's disease

Answer

Otosclerosis

Answer

Osteenic osteoarthritis

Question 4

"Boiler's notch" is suggestive of which type of hearing loss?

Accepted Answer

Noise-Induced Hearing Loss (NIHL)

Answer

Conductive Hearing Loss

Answer

Both Conductive Hearing Loss and Noise-Induced Hearing Loss (NIHL)

Answer

Normal Finding

Question 5

Middle ear effusion with an intact eardrum gives rise to which type of tympanogram?

Accepted Answer

Type B

Answer

Type A

Answer

Type C

Answer

Type D

Question 6

All of the following are tuning fork tests to differentiate hearing loss, EXCEPT:

Accepted Answer

Burn's test

Answer

Schwabach test

Answer

Gelle's test

Answer

Rinne test

Question 7

Carha's notch in audiometry is seen in which condition?

Accepted Answer

Otosclerosis

Answer

Ocular discontinuity

Answer

Haemotympanum

Answer

Otomycosis

Question 8

In noise-induced hearing loss, the audiogram typically shows a dip (Boiler's notch) at which frequency?

Accepted Answer

4000 Hz

Answer

1000 Hz

Answer

2000 Hz

Answer

3000 Hz

Question 9

Which virus causes acute onset sensorineural deafness?

Accepted Answer

Rubella, measles

Answer

Coronavirus

Answer

Mumps

Answer

Adenovirus

Question 10

Wave V in Brainstem Evoked Response Audiometry (BERA) typically corresponds to which neural pathway or structure?

Accepted Answer

Lateral lemniscus

Answer

Inferior colliculus

Answer

Cochlear nucleus

Answer

Eighth nerve (auditory nerve)

Audiology and Speech Disorders — MCQs

Audiology and Speech Disorders — MCQs

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