Audiology and Speech Disorders Practice Questions

Q: A 10-year-old boy presented with sensorineural deafness not benefited with a hearing aid. What is the next treatment?

Cochlear implant. **Explanation:** The patient is a 10-year-old child with **Sensorineural Hearing Loss (SNHL)** who has failed to benefit from conventional hearing aids. In cases of severe-to-profound SNHL where the auditory nerve is intact but the hair cells in the cochlea are non-functional, a **Cochlear Implant** is the gold standard treatment. It bypasses the damaged hair cells and directly stimulates the auditory nerve fibers electrically. **Analysis of Options:** * **A. Cochlear Implant (Correct):** Indicated for bilateral severe-to-profound SNHL when hearing aids provide inadequate benefit. In children, early implantation is crucial for speech and language development. * **B. Fenestromy:** This is an obsolete surgical procedure formerly used for otosclerosis (conductive hearing loss) to create a new window in the labyrinth. It has no role in treating SNHL. * **C. Stapedectomy:** This is the treatment of choice for **Otosclerosis**, which presents as **Conductive Hearing Loss (CHL)** due to stapes fixation. It involves replacing the stapes with a prosthesis and is contraindicated in SNHL. * **D. Stapes Fixation:** This is a pathological condition (clinical finding in otosclerosis), not a treatment modality. **High-Yield Clinical Pearls for NEET-PG:** * **Ideal Age for Implantation:** The earlier, the better (usually >12 months) to utilize the brain's neuroplasticity for language acquisition. * **Prerequisite:** A patent cochlea and a functional **Cochlear Nerve (CN VIII)** must be present (confirmed via MRI). * **Auditory Brainstem Implant (ABI):** Indicated if the cochlear nerve is absent or destroyed (e.g., Bilateral Acoustic Neuroma/NF2). * **Hennebert’s Sign:** False positive fistula test seen in Meniere’s or Congenital Syphilis; do not confuse with surgical indications.

Q: In right middle ear pathology, where will the Weber's test lateralize?

Lateralized to the right side. **Explanation:** The Weber’s test is a tuning fork test (using 512 Hz) used to evaluate bone conduction. It is based on the principle that sound lateralizes to the ear with better cochlear function or the ear with a conductive deficit. **1. Why the correct answer is right:** In **right middle ear pathology**, the patient has **Conductive Hearing Loss (CHL)** on the right side. In CHL, the Weber’s test lateralizes to the **affected ear** (the right side). This occurs because the conductive defect (e.g., fluid, ossicular fixation) creates a "masking effect" that blocks out ambient room noise, making the cochlea on that side more sensitive to the bone-conducted sound. Additionally, the "occlusion effect" prevents the escape of sound energy from the external canal, increasing the perceived intensity on the diseased side. **2. Why the incorrect options are wrong:** * **Option A & B (Centralized/Normal):** A centralized Weber occurs in individuals with normal hearing or those with symmetrical bilateral hearing loss. Since there is a specific pathology in the right ear, the sound will not remain central. * **Option D (Lateralized to the left side):** Lateralization to the contralateral (left) side occurs in **Sensorineural Hearing Loss (SNHL)**. If the right ear had a nerve defect, the sound would be heard better in the "better" ear (the left). **Clinical Pearls for NEET-PG:** * **Rinne Test:** In middle ear pathology (CHL), Rinne will be **Negative** (BC > AC). * **Weber Rule of Thumb:** * Lateralizes to **Worse** ear = Conductive Hearing Loss. * Lateralizes to **Better** ear = Sensorineural Hearing Loss. * **High-Yield:** The most common cause of a false-negative Rinne is severe unilateral SNHL; in such cases, Weber will lateralize to the normal ear.

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: 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: What is the ideal hearing aid for a patient with anotia?

Bone anchored hearing aid. ### Explanation **Correct Answer: B. Bone anchored hearing aid (BAHA)** **Medical Concept:** Anotia is the complete absence of the pinna and is almost always associated with **aural atresia** (absence of the external auditory canal). In such cases, sound cannot be conducted through the ear canal to the tympanic membrane. A **Bone Anchored Hearing Aid (BAHA)** bypasses the external and middle ear by converting sound into vibrations. These vibrations are transmitted directly through the skull bone to the functioning cochlea (bone conduction). It is the gold standard for permanent conductive hearing loss where conventional air-conduction aids cannot be worn due to anatomical absence of the canal. **Analysis of Incorrect Options:** * **A. In-the-canal (ITC) hearing aid:** These require a patent external auditory canal to house the device. In anotia/atresia, there is no canal to hold the aid. * **C. Vestibular implant:** These are experimental devices designed to restore balance function in patients with bilateral vestibular loss, not to restore hearing. * **D. Transcutaneous hearing aid:** While some BAHA systems are transcutaneous (using magnets), the term is broad. In the context of anotia, the specific surgical "Bone Anchored" system is the definitive clinical choice. **High-Yield Clinical Pearls for NEET-PG:** * **Minimum Age for BAHA:** In children with congenital atresia, surgical BAHA is typically delayed until age **5 years** (when the skull bone is thick enough). Before age 5, a **BAHA headband** (softband) is used. * **Indications for BAHA:** 1. Congenital atresia/anotia (Treacher Collins, Goldenhar syndrome). 2. Chronic Suppurative Otitis Media (CSOM) where a discharging ear prevents the use of an earmold. 3. Single-sided deafness (SSD). * **Components:** BAHA consists of a titanium implant, an external abutment (or magnet), and a sound processor.

Q: This tympanogram is seen in which of the following conditions?

Chronic suppurative otitis media (CSOM). ***Chronic suppurative otitis media (CSOM)*** - Produces a **Type B flat tympanogram** with **large ear canal equivalent volume (ECV > 2.0 mL)** due to **tympanic membrane perforation**. - The perforation allows the **middle ear space** to communicate with the **ear canal**, resulting in an abnormally high volume measurement. *Otitis media with effusion (OME)* - Shows a **Type B flat tympanogram** but with **normal ear canal equivalent volume (ECV < 2.0 mL)**. - The **intact tympanic membrane** prevents increased volume measurement despite **middle ear fluid**. *Otosclerosis* - Demonstrates a **Type As tympanogram** with **shallow compliance** and **normal ear canal volume**. - **Stapes fixation** reduces **tympanic membrane mobility** while keeping the membrane intact. *Ossicular chain discontinuity* - Results in a **Type Ad tympanogram** with **abnormally high compliance** and **normal ear canal volume**. - **Broken ossicular chain** causes **hypermobility** of the tympanic membrane without perforation.

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: 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.

Q: All are true about cochlear implant except?

MRI has no role in pre-operative assessment. **Explanation:** The correct answer is **D (MRI has no role in pre-operative assessment)** because MRI is, in fact, a **mandatory** part of the pre-operative evaluation for a cochlear implant. While a High-Resolution CT (HRCT) of the temporal bone assesses the bony anatomy (e.g., cochlear patency, facial nerve course), an **MRI (3D-CISS/FIESTA sequence)** is essential to visualize the soft tissues. It confirms the presence of the vestibulocochlear nerve (CN VIII) and rules out cochlear nerve aplasia, labyrinthitis ossificans, or internal auditory canal stenosis, which would contraindicate the procedure. **Analysis of other options:** * **A. Minimum age is 1 year:** This is generally true for congenital deafness. Early implantation (12–24 months) takes advantage of maximum neuroplasticity during the critical period of language development. * **B. PTA of 70 dB or more:** Cochlear implants are indicated for individuals with **severe to profound sensorineural hearing loss (SNHL)** who derive minimal benefit from conventional hearing aids. A Pure Tone Average (PTA) of >70 dB (severe) or >90 dB (profound) is a standard criterion. * **C. Switch on is done after 3 weeks:** The external processor is typically "switched on" and mapped 3 to 4 weeks post-surgery. This delay allows for adequate wound healing and the subsidence of post-operative edema. **Clinical Pearls for NEET-PG:** * **Ideal Candidate:** A post-lingual deaf adult or a pre-lingual deaf child (best results if implanted before age 5). * **The Electrode:** It is placed in the **Scala Tympani** of the cochlea. * **Contraindications:** Absence of the cochlear nerve, complete cochlear agenesis (Michel deformity), and active middle ear infections. * **Meningitis Risk:** Patients must be vaccinated against *Streptococcus pneumoniae* prior to surgery due to the increased risk of meningitis.

Question 1

A 10-year-old boy presented with sensorineural deafness not benefited with a hearing aid. What is the next treatment?

Accepted Answer

Cochlear implant

Answer

Fenestromy

Answer

Stapedectomy

Answer

Stapes fixation

Question 2

In right middle ear pathology, where will the Weber's test lateralize?

Accepted Answer

Lateralized to the right side

Answer

Centralized

Answer

Normal

Answer

Lateralized to the left side

Question 3

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 4

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 5

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 6

What is the ideal hearing aid for a patient with anotia?

Accepted Answer

Bone anchored hearing aid

Answer

Incanal hearing aid

Answer

Vestibular implant

Answer

Transcutaneous hearing aid

Question 7

This tympanogram is seen in which of the following conditions?

Accepted Answer

Chronic suppurative otitis media (CSOM)

Answer

Otitis media with effusion (OME)

Answer

Otosclerosis

Answer

Ossicular chain discontinuity

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

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)

Question 10

All are true about cochlear implant except?

Accepted Answer

MRI has no role in pre-operative assessment

Answer

Minimum age is 1 year

Answer

PTA of 70 dB or more

Answer

Switch on is done after 3 weeks

Audiology and Speech Disorders — MCQs

Audiology and Speech Disorders — MCQs

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