Audiology and Speech Disorders — MCQs

Audiology and Speech Disorders Indian Medical PG Practice Questions and MCQs

Question 81: A 3-year-old child presents with sensorineural deafness that has not shown improvement with hearing aids. What is the next best management option?

A. Cochlear implant (Correct Answer)
B. Stapes fixation
C. Stapedectomy
D. Fenestration

Explanation: **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 It has been replaced by stapedotomy/stapedectomy and is not indicated for SNHL.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.

Question 82: Unilateral sensorineural hearing loss may occur in which of the following viral infections?

A. Coronavirus
B. Mumps (Correct Answer)
C. Pertussis
D. Rotavirus

Explanation: **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.

Question 83: Impedance audiometry is used to assess pathology of which part of the ear?

A. External ear
B. Middle ear (Correct Answer)
C. Mastoid air cell
D. Inner ear

Explanation: **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.

Question 84: High-frequency audiometry is primarily used in the assessment of which of the following conditions?

A. Meniere's disease
B. Otosclerosis
C. Drug-induced ototoxicity (Correct Answer)
D. Sensorineural hearing loss

Explanation: **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).

Question 85: What is true about otoacoustic emissions?

A. Are produced by the outer hair cells. (Correct Answer)
B. Are produced by the inner hair cells.
C. Are used as a screening test of hearing in newborn infants.
D. Are useful in ototoxicity monitoring.

Explanation: **Explanation:** Otoacoustic Emissions (OAEs) are low-intensity sounds generated within the cochlea that can be measured in the external auditory canal. **1. Why Option A is Correct:** OAEs are a direct byproduct of the **electromotility of the Outer Hair Cells (OHCs)**. The OHCs possess a unique protein called *prestin*, which allows them to contract and expand in response to sound. This active process acts as a "cochlear amplifier." The mechanical energy produced by these vibrations travels backward through the middle ear and vibrates the tympanic membrane, creating the sound we record as an OAE. **2. Analysis of Other Options:** * **Option B:** **Inner Hair Cells (IHCs)** are responsible for converting mechanical vibrations into neural impulses (sensory transduction) sent to the brain. They do not possess motile properties and do not produce OAEs. * **Option C & D:** While OAEs *are* indeed used for newborn hearing screening and ototoxicity monitoring, the question asks for the most fundamental "truth" regarding their physiological origin. In many competitive exams, if a physiological fact (origin) is pitted against clinical applications, the physiological origin is prioritized as the "most true" or defining characteristic. *Note: In some exam patterns, this could be considered a multiple-correct question, but Option A remains the primary physiological definition.* **High-Yield Clinical Pearls for NEET-PG:** * **Presence of OAEs:** Indicates a healthy cochlea (specifically OHCs) and a functional conductive mechanism (middle ear). * **Hearing Loss Threshold:** OAEs are typically absent if there is a hearing loss of **>30-35 dB**. * **Clinical Utility:** Used in **Universal Newborn Hearing Screening (UNHS)** because they are non-invasive and rapid. * **Auditory Neuropathy:** A classic "catch" in exams—patients with Auditory Neuropathy Spectrum Disorder (ANSD) will have **Normal OAEs** but an **Abnormal BERA/ABR**.

Question 86: Which of the following conditions is NOT a typical indication for a cochlear implant?

A. Sensorineural deafness (Correct Answer)
B. Conductive deafness
C. Mixed deafness
D. Absent pinna

Explanation: ### 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**).

Question 87: All are causes of sensorineural deafness except?

A. Old age
B. Cochlear otosclerosis
C. Loud sound
D. Rupture of tympanic membrane (Correct Answer)

Explanation: **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.

Question 88: Connexin 26 mutation is associated with which of the following conditions?

A. Deafness (Correct Answer)
B. Anosmia
C. Seizures
D. None of the above

Explanation: **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.

Question 89: BAEP (Brainstem Auditory Evoked Potential) is a reliable indicator in the diagnosis of:

A. Otosclerosis
B. Vestibular neuronitis
C. Acoustic schwannoma (Correct Answer)
D. Vestibular Migraine

Explanation: **Explanation:** **Brainstem Auditory Evoked Potential (BAEP)**, also known as BERA (Brainstem Auditory Evoked Response Audiometry), is an objective electrophysiological test that tracks the electrical activity of the auditory pathway from the auditory nerve to the brainstem. **Why Acoustic Schwannoma is Correct:** Acoustic Schwannoma (Vestibular Schwannoma) is a retrocochlear lesion that compresses the VIII cranial nerve. This compression delays the conduction of electrical impulses. On a BERA waveform, this typically manifests as: * An **increased Wave I-V latency** (the most sensitive parameter). * An increased interaural latency difference (ILD) of Wave V (>0.2 ms). * Absence of waves in advanced cases. Because BERA can detect even small tumors that haven't caused significant hearing loss, it serves as a highly reliable screening tool for retrocochlear pathology. **Why Other Options are Incorrect:** * **Otosclerosis:** This is a conductive hearing loss pathology involving the stapes footplate. BERA is primarily used to differentiate sensory from neural (retrocochlear) loss; it is not the diagnostic gold standard for middle ear ossicular issues. * **Vestibular Neuronitis:** This condition involves inflammation of the vestibular nerve, affecting balance. Since BERA measures the **auditory** pathway, it remains normal in isolated vestibular disorders. * **Vestibular Migraine:** This is a central vestibular disorder with a normal auditory pathway. Diagnosis is clinical based on history, not electrophysiological testing. **High-Yield Clinical Pearls for NEET-PG:** * **Wave I:** Distal VIII nerve (most important for site-of-lesion). * **Wave II:** Proximal VIII nerve. * **Wave III:** Superior Olivary Complex. * **Wave IV:** Lateral Lemniscus. * **Wave V:** Inferior Colliculus (most stable wave, used for threshold determination). * **Gold Standard** for diagnosing Acoustic Schwannoma is **Gadolinium-enhanced MRI**. BERA is the best **screening** test.

Question 90: In normal adults, wave V of the auditory brainstem response is generated from which part of the auditory pathway?

A. Cochlear nucleus
B. Superior olivary complex
C. Lateral lemniscus (Correct Answer)
D. Inferior colliculus

Explanation: **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.

Practice by Chapter

Hearing Assessment Techniques

Practice Questions

Tympanometry and Acoustic Reflexes

Practice Questions

Otoacoustic Emissions

Practice Questions

Auditory Brainstem Response

Practice Questions

Hearing Aids

Practice Questions

Cochlear Implants

Practice Questions

Bone-Anchored Hearing Devices

Practice Questions

Speech and Language Development

Practice Questions

Articulation Disorders

Practice Questions

Stuttering

Practice Questions

Dysphonia

Practice Questions

Rehabilitation of Hearing-Impaired Children

Practice Questions

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