Audiology and Speech Disorders Practice Questions

Q: A young man presents with an accident leading to loss of hearing in the right ear. On otoscopic examination, the tympanic membrane was intact. Pure tone audiometry shows an Air - Bone gap of 55 dB in the right ear with normal cochlear reserve. Which of the following will be the likely tympanometry finding?

Ad type tympanogram. ### Explanation **Concept:** The patient presents with post-traumatic conductive hearing loss (CHL) characterized by an intact tympanic membrane and a significant **Air-Bone (A-B) gap of 55 dB**. In clinical audiology, an A-B gap exceeding 50 dB is a classic indicator of **Ossicular Discontinuity** (e.g., incudostapedial joint dislocation). When the ossicular chain is broken, the middle ear system loses its stiffness and becomes "hypermobile" or overly compliant. **Why Ad is Correct:** * **Type Ad (Deep/Disconnected):** This tympanogram shows a very high peak (high compliance) at normal atmospheric pressure. It occurs when the tympanic membrane or ossicles move too freely. In this case, the trauma caused ossicular disruption, leading to this hypermobile pattern. **Why Other Options are Incorrect:** * **Type As (Stiff/Sclerotic):** Shows a shallow peak at normal pressure. It is seen in conditions that increase the stiffness of the system, such as **Otosclerosis** or tympanosclerosis. * **Type B (Flat):** No peak is seen. This indicates restricted mobility, typically due to **Otitis Media with Effusion** (fluid behind the drum) or a perforated TM. * **Type C (Negative Pressure):** The peak is shifted to the left (negative pressure). This indicates **Eustachian tube dysfunction**, often seen in the early stages of ASOM or resolving URIs. **Clinical Pearls for NEET-PG:** 1. **Maximum A-B Gap:** The maximum possible conductive hearing loss with an intact TM is approximately **60 dB** (seen in ossicular dissociation). If the gap is only 25–30 dB, consider a simple TM perforation. 2. **Carhart’s Notch:** A dip in bone conduction at 2000 Hz, characteristic of Otosclerosis (Type As tympanogram). 3. **Trauma Triad:** Longitudinal temporal bone fractures often present with ossicular disruption (Ad), while transverse fractures often involve the labyrinth, leading to SNHL.

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: 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: What component is surgically placed inside the ear during the implantation of a cochlear device?

Receiver stimulator. **Explanation:** A cochlear implant consists of two main parts: an **external component** and an **internally implanted component**. The **Receiver-Stimulator** is the internal component surgically placed under the skin in a bony well created in the temporal bone. It receives FM radio signals from the external transmitter, converts them into electrical pulses, and sends them to the **electrode array** (which is inserted into the *scala tympani* of the cochlea) to directly stimulate the auditory nerve. **Analysis of Incorrect Options:** * **A. Microphone:** An external component that picks up sound waves from the environment. * **B. Speech Processor:** An external component (usually worn behind the ear) that converts sound into digital signals. * **C. Transmitting Coil:** An external component held against the skin via a magnet; it transmits the processed sound to the internal receiver via induction. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** It bypasses damaged hair cells to directly stimulate the **Spiral Ganglion** (auditory nerve). * **Ideal Candidate:** Children with bilateral profound sensorineural hearing loss (SNHL) who do not benefit from hearing aids. The best results are seen in **pre-lingual** children (implanted by age 1–2) or **post-lingual** adults. * **Imaging:** HRCT of the temporal bone is mandatory to check for cochlear patency (e.g., to rule out labyrinthitis ossificans). * **Complication:** Increased risk of **Meningitis**; hence, pneumococcal vaccination is mandatory before surgery.

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: What is true about the tympanic membrane?

Otosclerosis reduces compliance. ### Explanation The core concept behind this question is **Acoustic Admittance (Compliance)**, which measures how easily energy flows through the middle ear system. Compliance is the inverse of stiffness. **Why Option D is Correct:** **Otosclerosis** involves the fixation of the stapes footplate in the oval window due to bony overgrowth. This increases the **stiffness** of the ossicular chain. Since stiffness and compliance are inversely related, the increased stiffness leads to **reduced compliance**. On tympanometry, this typically presents as a **Type As** (S for Shallow/Stiff) curve. **Analysis of Incorrect Options:** * **Option A:** **Tympanosclerosis** (hyaline deposits/calcification) makes the membrane thicker and stiffer, which **decreases** compliance (Type As). * **Option B:** In **Ossicular Disruption** (with an intact drum), the middle ear system loses its structural rigidity. This results in a "floppy" system with **pathologically increased compliance**, characterized by a **Type Ad** (D for Disarticulation/Deep) curve. * **Option C:** **Fluid in the middle ear** (Serous Otitis Media) adds mass and prevents the membrane from vibrating. This significantly **reduces** compliance, resulting in a flat **Type B** curve. **High-Yield Clinical Pearls for NEET-PG:** * **Type A:** Normal middle ear function. * **Type As (Stiff):** Seen in Otosclerosis and Malleus fixation. * **Type Ad (Disarticulation):** Seen in Ossicular discontinuity or a thin, monomeric tympanic membrane. * **Type B (Flat):** Seen in Middle ear effusion (fluid), thick wax, or TM perforation (differentiated by ear canal volume). * **Type C (Negative Pressure):** Seen in Eustachian tube dysfunction.

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.

Question 1

A young man presents with an accident leading to loss of hearing in the right ear. On otoscopic examination, the tympanic membrane was intact. Pure tone audiometry shows an Air - Bone gap of 55 dB in the right ear with normal cochlear reserve. Which of the following will be the likely tympanometry finding?

Accepted Answer

Ad type tympanogram

Answer

As type tympanogram

Answer

B type tympanogram

Answer

C type tympanogram

Question 2

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 3

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 4

What component is surgically placed inside the ear during the implantation of a cochlear device?

Accepted Answer

Receiver stimulator

Answer

Microphone

Answer

Speech processor

Answer

Transmitting coil

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 is NOT true about Cochlear implants?

Accepted Answer

Any displacements or malfunctioning of a Cochlear implant can be detected via MRI

Answer

Indicated in loss of function of the Auditory Nerve

Answer

Done in cases of Bilateral hearing loss

Answer

The implant is placed in the scala tympani

Question 7

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 8

What is true about the tympanic membrane?

Accepted Answer

Otosclerosis reduces compliance

Answer

Tympanosclerosis with increased compliance

Answer

Ossicular disruption with intact tympanic membrane and increased compliance

Answer

Fluid in middle ear cavity increases compliance

Question 9

All are causes of sensorineural deafness except?

Accepted Answer

Rupture of tympanic membrane

Answer

Old age

Answer

Cochlear otosclerosis

Answer

Loud sound

Question 10

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

Accepted Answer

Deafness

Answer

Anosmia

Answer

Seizures

Answer

None of the above

Audiology and Speech Disorders — MCQs

Audiology and Speech Disorders — MCQs

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