Audiology and Speech Disorders Practice Questions

Q: A 3-year-old child presents with sensorineural deafness that has not shown improvement with hearing aids. What is the next best management option?

Cochlear implant. **Explanation:** The correct answer is **Cochlear Implant (A)**. **Why it is correct:** In a pediatric patient with severe-to-profound **Sensorineural Hearing Loss (SNHL)** who does not benefit from conventional hearing aids, a cochlear implant is the gold standard of management. Hearing aids work by amplifying sound (requiring functional hair cells), whereas a cochlear implant bypasses the damaged hair cells in the cochlea and directly stimulates the auditory nerve fibers. For children, early implantation (ideally before age 2, but certainly by age 3) is critical to utilize the brain's neuroplasticity for speech and language development. **Why the other options are incorrect:** * **Stapes fixation (B):** This is a clinical finding (often seen in Otosclerosis), not a management option. * **Stapedectomy (C):** This is the surgical treatment for Otosclerosis. It is used to treat **Conductive Hearing Loss**, not SNHL. Performing this on a child with SNHL would provide no benefit. * **Fenestration (D):** This is an obsolete surgical procedure formerly used for Otosclerosis. It has been replaced by stapedotomy/stapedectomy and is not indicated for SNHL. **Clinical Pearls for NEET-PG:** * **Ideal age for Cochlear Implant:** 12 to 24 months (earlier is better for language acquisition). * **Prerequisite:** A functional Auditory Nerve (VIIIth nerve) must be present (checked via MRI). * **Bilateral vs. Unilateral:** Bilateral implantation is preferred for better sound localization and hearing in noise. * **Post-op:** Mapping and intensive speech therapy are mandatory for success.

Q: Unilateral sensorineural hearing loss may occur in which of the following viral infections?

Mumps. **Explanation:** **Mumps** is the most common viral cause of **unilateral sudden sensorineural hearing loss (SNHL)**. The virus causes endolymphatic labyrinthitis, leading to the destruction of the hair cells in the Organ of Corti and atrophy of the stria vascularis. While the hearing loss is typically sudden and profound, it is characteristically unilateral in about 80% of cases, though bilateral involvement can occur. **Analysis of Options:** * **Coronavirus:** While COVID-19 has been associated with rare cases of SNHL and tinnitus, it is not a classic or frequently tested cause of unilateral SNHL in the context of standard ENT textbooks. * **Pertussis:** Caused by *Bordetella pertussis*, this is a respiratory bacterial infection (Whooping cough) and is not associated with direct viral labyrinthitis or SNHL. * **Rotavirus:** This is a primary cause of viral gastroenteritis in children and does not have neurotropic or ototropic properties. **Clinical Pearls for NEET-PG:** * **Mumps:** Most common cause of unilateral SNHL in children. * **Measles:** Often causes **bilateral** and symmetrical SNHL. * **Congenital Rubella:** Classically associated with "cookie-bite" SNHL and the "Salt and Pepper" retinopathy. * **Herpes Zoster Oticus (Ramsay Hunt Syndrome):** Presents with SNHL, facial palsy, and vesicles on the auricle (caused by VZV). * **Cytomegalovirus (CMV):** The most common **non-genetic** cause of congenital SNHL.

Q: Impedance audiometry is used to assess pathology of which part of the ear?

Middle ear. **Explanation:** Impedance audiometry (Tympanometry) is an objective test used to evaluate the function of the **middle ear**. It measures the "impedance" (resistance) or "admittance" (ease of flow) of energy through the middle ear mechanism as air pressure in the external canal is varied. **Why Middle Ear is correct:** The test specifically assesses the status of the tympanic membrane and the ossicular chain. By measuring how the eardrum moves in response to pressure changes, clinicians can diagnose middle ear pathologies such as fluid (Otitis Media with Effusion), ossicular discontinuity, or Eustachian tube dysfunction. **Why other options are incorrect:** * **External ear:** While the probe is placed in the external canal, the canal must be clear for the test to work. Impedance audiometry does not diagnose external ear pathology; rather, external ear obstruction (like wax) prevents the test from being performed. * **Mastoid air cell:** While the mastoid is continuous with the middle ear, impedance audiometry specifically measures the compliance of the tympanic membrane and ossicles, not the mastoid air system directly. * **Inner ear:** Inner ear function (sensory) is assessed via Pure Tone Audiometry (PTA) or Otoacoustic Emissions (OAE). Impedance audiometry is a test of the "conductive" apparatus. **High-Yield Clinical Pearls for NEET-PG:** * **Type A curve:** Normal middle ear function. * **Type As (Shallow):** Otosclerosis (stiff ossicular chain). * **Type Ad (Deep/Disconnected):** Ossicular discontinuity or thin monomeric TM. * **Type B (Flat):** Middle ear effusion (Glue ear) or TM perforation. * **Type C:** Eustachian tube dysfunction (Negative pressure). * **Acoustic Reflex:** Also measured during impedance audiometry; it involves the Stapedius muscle (CN VII) and is absent in significant conductive or retrocochlear hearing loss.

Q: High-frequency audiometry is primarily used in the assessment of which of the following conditions?

Drug-induced ototoxicity. **Explanation:** **High-frequency audiometry (HFA)** involves testing hearing thresholds at frequencies above the standard range (typically between 8,000 Hz and 20,000 Hz). **1. Why Drug-induced Ototoxicity is correct:** Ototoxic drugs (such as Aminoglycosides like Gentamicin or Cisplatin) typically damage the **outer hair cells at the basal turn of the cochlea** first. Since the base of the cochlea is responsible for processing high-frequency sounds, hearing loss begins at these ultra-high frequencies before progressing to the conventional speech frequencies (250–8,000 Hz). HFA allows for the **earliest possible detection** of cochlear damage, often before the patient notices any hearing deficit, allowing for a modification of the drug regimen. **2. Analysis of Incorrect Options:** * **Meniere’s Disease:** Characteristically presents with **low-frequency** sensorineural hearing loss (SNHL) in the early stages, often showing an "ascending" curve on a standard audiogram. * **Otosclerosis:** This is a conductive hearing loss condition. The classic finding is **Cahart’s Notch**, a dip in bone conduction at **2,000 Hz**, not high-frequency loss. * **Sensorineural Hearing Loss (SNHL):** While SNHL can involve high frequencies (e.g., Presbycusis), "SNHL" is a broad category. HFA is a *specific* diagnostic tool prioritized for monitoring ototoxicity and early noise-induced trauma. **Clinical Pearls for NEET-PG:** * **Standard Audiometry Range:** 250 Hz to 8,000 Hz. * **High-Frequency Audiometry Range:** 8,000 Hz to 20,000 Hz. * **Ototoxicity Monitoring:** The "gold standard" for early detection is HFA followed by **Otoacoustic Emissions (OAEs)**. * **Noise-Induced Hearing Loss (NIHL):** Characterized by a pathognomonic dip (notch) at **4,000 Hz** (Acoustic Dip).

Q: Which of the following conditions is NOT a typical indication for a cochlear implant?

Sensorineural deafness. ### Explanation The primary goal of a **Cochlear Implant (CI)** is to bypass damaged hair cells in the cochlea and directly stimulate the **auditory nerve**. Therefore, the fundamental indication for a CI is **severe to profound bilateral Sensorineural Hearing Loss (SNHL)** that does not benefit from conventional hearing aids. **Why the Question/Options are structured this way:** * **Sensorineural Deafness (Correct Answer):** This is the **primary indication** for a cochlear implant. In these patients, the outer and middle ear are often normal, but the inner ear (cochlea) fails to convert sound into electrical signals. * **Conductive & Mixed Deafness (Incorrect Options):** These conditions involve pathology in the external or middle ear. They are typically managed with medical treatment, reconstructive surgery (e.g., tympanoplasty), or **Bone Anchored Hearing Aids (BAHA)**. A CI is not indicated unless there is a profound sensorineural component that cannot be addressed otherwise. * **Absent Pinna (Incorrect Option):** This is a structural deformity (Microtia/Anotia). While it may be associated with canal atresia (conductive loss), it is not an indication for a CI. These patients are candidates for prosthetic reconstruction or BAHA. **High-Yield Clinical Pearls for NEET-PG:** 1. **Ideal Candidate:** A child with congenital bilateral profound SNHL, ideally implanted before age 2 (plasticity of the auditory cortex). 2. **Prerequisite:** The **Auditory Nerve (CN VIII) must be intact** and the cochlea must be patent (not ossified). 3. **Contraindication:** Acoustic neuroma (CN VIII tumor) or bilateral VIII nerve aplasia. In such cases, an **Auditory Brainstem Implant (ABI)** is used instead. 4. **Components:** The CI has an external part (microphone, processor, transmitter) and an internal part (receiver-stimulator and electrode array placed in the **Scala Tympani**).

Q: All are causes of sensorineural deafness except?

Rupture of tympanic membrane. **Explanation:** Hearing loss is broadly classified into **Conductive Hearing Loss (CHL)**, caused by lesions in the external or middle ear, and **Sensorineural Hearing Loss (SNHL)**, caused by lesions in the cochlea (sensory) or the VIIIth cranial nerve (neural). **Why Option D is correct:** **Rupture of the tympanic membrane** is a classic cause of **Conductive Hearing Loss**. The tympanic membrane is part of the sound-conducting mechanism; its perforation disrupts the efficient transmission of sound vibrations from the external canal to the ossicular chain, leading to a "conductive" gap. **Analysis of incorrect options (Causes of SNHL):** * **A. Old Age:** Known as **Presbycusis**, this is the most common cause of SNHL. It involves progressive degeneration of the Organ of Corti and spiral ganglion cells. * **B. Cochlear Otosclerosis:** While early otosclerosis causes CHL (stapes fixation), "Cochlear" or "Malignant" otosclerosis involves the bony labyrinth, releasing enzymes into the inner ear fluids that damage the hair cells, resulting in SNHL. * **C. Loud Sound:** Noise-Induced Hearing Loss (NIHL) causes SNHL by damaging the stereocilia of the outer hair cells in the cochlea, typically presenting with a "4 kHz notch" on an audiogram. **High-Yield Clinical Pearls for NEET-PG:** 1. **Otosclerosis:** Usually presents with CHL and **Schwartz sign** (flamingo pink flush). It becomes SNHL only in the "Cochlear" variety. 2. **Carhart’s Notch:** A characteristic dip in bone conduction at **2 kHz** seen in otosclerosis (this is a mechanical artifact, not true SNHL). 3. **Rinne Test:** Negative in CHL (BC > AC) and Positive in SNHL (AC > BC). 4. **Weber Test:** Lateralizes to the **poorer** ear in CHL and to the **better** ear in SNHL.

Q: Connexin 26 mutation is associated with which of the following conditions?

Deafness. **Explanation:** **Connexin 26 (GJB2 gene)** mutation is the most common cause of **non-syndromic autosomal recessive sensorineural hearing loss (SNHL)** worldwide. **Why Deafness is the Correct Answer:** Connexin 26 is a gap junction protein found in the cochlea. These proteins form channels that allow for the rapid recycling of **Potassium ($K^+$) ions** from the hair cells back to the stria vascularis. This recycling is essential for maintaining the high endocochlear potential required for sound transduction. Mutations in the **GJB2 gene** (which encodes Connexin 26) disrupt this ionic homeostasis, leading to hair cell dysfunction and subsequent deafness. **Why Other Options are Incorrect:** * **Anosmia:** Loss of smell is typically associated with Kallmann syndrome (often linked to KAL1 mutations) or head trauma, not gap junction protein mutations. * **Seizures:** While some genetic syndromes involve both deafness and seizures (e.g., certain mitochondrial disorders), Connexin 26 mutations are specifically localized to the inner ear and skin, without primary neurological involvement in the central nervous system. **High-Yield Clinical Pearls for NEET-PG:** * **DFNB1:** This is the specific locus name for non-syndromic deafness caused by GJB2/Connexin 26 mutations. * **Inheritance:** Most commonly **Autosomal Recessive** (70-80% of non-syndromic cases). * **Syndromic Association:** While primarily non-syndromic, certain Connexin mutations can be associated with skin disorders like **Vohwinkel syndrome** (keratoderma). * **Management:** Children with Connexin 26 mutations often have excellent outcomes with **Cochlear Implants** because the auditory nerve and central pathways remain intact.

Q: In normal adults, wave V of the auditory brainstem response is generated from which part of the auditory pathway?

Lateral lemniscus. **Explanation:** The Auditory Brainstem Response (ABR) 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 click stimulus. It consists of seven waves, with the first five being the most clinically significant. **Wave V** is primarily generated by the **Lateral Lemniscus** (specifically its termination/distal portion). It is the most robust and stable wave, often used to determine the hearing threshold in infants and uncooperative patients. **Analysis of Options:** * **A. Cochlear Nucleus:** This generates **Wave III**. * **B. Superior Olivary Complex:** This generates **Wave IV**. * **C. Lateral Lemniscus:** Correct. It is the generator for **Wave V**. (Note: Some texts attribute Wave V to the Inferior Colliculus, but for NEET-PG, the standard mnemonic E-COLI identifies Wave V with the Lateral Lemniscus). * **D. Inferior Colliculus:** While it contributes to the later part of Wave V, it is classically associated with **Wave VI**. **High-Yield Mnemonic: E-COLI** To remember the generators of Waves I-V: * **E:** Eighth Nerve (Wave I: Distal; Wave II: Proximal) * **C:** Cochlear Nucleus (Wave III) * **O:** Olivary Complex (Superior) (Wave IV) * **L:** Lateral Lemniscus (Wave V) * **I:** Inferior Colliculus (Wave VI) **Clinical Pearls for NEET-PG:** 1. **Wave I** is the only wave generated from the peripheral auditory system (distal acoustic nerve). 2. **Inter-peak latency (I-V)** is the most important parameter for diagnosing retrocochlear pathology (e.g., Vestibular Schwannoma). 3. ABR is a **screening tool** for acoustic neuroma and a **gold standard** for objective hearing assessment in neonates.

Question 1

A 3-year-old child presents with sensorineural deafness that has not shown improvement with hearing aids. What is the next best management option?

Accepted Answer

Cochlear implant

Answer

Stapes fixation

Answer

Stapedectomy

Answer

Fenestration

Question 2

Unilateral sensorineural hearing loss may occur in which of the following viral infections?

Accepted Answer

Mumps

Answer

Coronavirus

Answer

Pertussis

Answer

Rotavirus

Question 3

Impedance audiometry is used to assess pathology of which part of the ear?

Accepted Answer

Middle ear

Answer

External ear

Answer

Mastoid air cell

Answer

Inner ear

Question 4

High-frequency audiometry is primarily used in the assessment of which of the following conditions?

Accepted Answer

Drug-induced ototoxicity

Answer

Meniere's disease

Answer

Otosclerosis

Answer

Sensorineural hearing loss

Question 5

What is true about otoacoustic emissions?

Accepted Answer

Are produced by the outer hair cells.

Answer

Are produced by the inner hair cells.

Answer

Are used as a screening test of hearing in newborn infants.

Answer

Are useful in ototoxicity monitoring.

Question 6

Which of the following conditions is NOT a typical indication for a cochlear implant?

Accepted Answer

Sensorineural deafness

Answer

Conductive deafness

Answer

Mixed deafness

Answer

Absent pinna

Question 7

All are causes of sensorineural deafness except?

Accepted Answer

Rupture of tympanic membrane

Answer

Old age

Answer

Cochlear otosclerosis

Answer

Loud sound

Question 8

Connexin 26 mutation is associated with which of the following conditions?

Accepted Answer

Deafness

Answer

Anosmia

Answer

Seizures

Answer

None of the above

Question 9

BAEP (Brainstem Auditory Evoked Potential) is a reliable indicator in the diagnosis of:

Accepted Answer

Acoustic schwannoma

Answer

Otosclerosis

Answer

Vestibular neuronitis

Answer

Vestibular Migraine

Question 10

In normal adults, wave V of the auditory brainstem response is generated from which part of the auditory pathway?

Accepted Answer

Lateral lemniscus

Answer

Cochlear nucleus

Answer

Superior olivary complex

Answer

Inferior colliculus

Audiology and Speech Disorders — MCQs

Audiology and Speech Disorders — MCQs

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