Audiology and Speech Disorders Practice Questions

Q: Type Ad curve in tympanometry is seen in which of the following conditions?

After stapedectomy. **Explanation:** Tympanometry measures the compliance of the middle ear system. The **Type $A_d$ curve** (where 'd' stands for deep or discontinued) is characterized by a normal peak pressure (near 0 daPa) but an **abnormally high compliance** (a very tall, peaked curve). **1. Why "After stapedectomy" is correct:** The Type $A_d$ curve occurs when the tympanic membrane is hypermobile or the ossicular chain is disrupted. In a post-stapedectomy patient, the natural rigid continuity of the ossicular chain is replaced by a prosthesis. If the prosthesis is loose or if there is **ossicular discontinuity**, the resistance to sound is significantly reduced, leading to high compliance. It is also classically seen in **ossicular dislocation** (e.g., trauma) and **flaccid/monomeric tympanic membranes**. **2. Why other options are incorrect:** * **Eustachian tube obstruction:** Leads to negative pressure in the middle ear, resulting in a **Type C curve** (peak shifted to the left). * **Secretory otitis media:** Fluid in the middle ear restricts all movement of the drum, resulting in a **Type B curve** (flat curve). * **Middle ear tumors:** Like Glomus jugulare, these increase the mass/stiffness of the system, typically leading to a **Type B curve** or a pulsatile tracing. **Clinical Pearls for NEET-PG:** * **Type A:** Normal middle ear function. * **Type $A_s$ (S = Stiff/Shallow):** Normal pressure but low compliance; seen in **Otosclerosis** and Tympanosclerosis. * **Type B:** Flat curve; seen in **Serous Otitis Media** (fluid), thick wax, or TM perforation (large canal volume). * **Type C:** Negative pressure; seen in **Eustachian tube dysfunction**.

Q: Deafness is seen with which of the following conditions?

Congenital QT syndrome. ### Explanation **Correct Answer: B. Congenital QT syndrome** The association between deafness and Congenital Long QT Syndrome (LQTS) is a classic high-yield medical correlation. Specifically, **Jervell and Lange-Nielsen syndrome** is an autosomal recessive condition characterized by the combination of: 1. **Congenital sensorineural hearing loss (SNHL):** Caused by mutations in potassium channel genes (*KCNQ1* or *KCNE1*), which are essential for maintaining the endolymph potential in the inner ear. 2. **Prolonged QT interval:** Leading to ventricular arrhythmias (Torsades de Pointes), syncope, and sudden cardiac death. **Analysis of Incorrect Options:** * **A. Essential Hypertension:** While chronic hypertension can lead to microvascular changes in the cochlea over decades, it is not a primary "cause" of deafness in the context of syndromic associations. * **C. Marfan Syndrome:** This is a connective tissue disorder (Fibrillin-1 mutation) primarily affecting the skeletal, ocular (ectopia lentis), and cardiovascular (aortic aneurysm) systems. It is not typically associated with hearing loss. * **D. Turner Syndrome:** While Turner syndrome (45, XO) is associated with an increased risk of middle ear infections (otitis media) and progressive SNHL, it is not the "classic" association for deafness in this specific MCQ set compared to the definitive Jervell and Lange-Nielsen syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Romano-Ward Syndrome:** The most common Long QT syndrome; it is autosomal dominant and features a normal hearing profile. * **Usher Syndrome:** The most common cause of combined deafness and blindness (Retinitis Pigmentosa). * **Waardenburg Syndrome:** Characterized by SNHL, white forelock, and heterochromia iridis. * **Alport Syndrome:** SNHL associated with progressive renal failure and ocular defects (lenticonus).

Q: Type Ad curve is seen in?

After stapedectomy. ### Explanation **Tympanometry** measures the compliance of the tympanic membrane and the ossicular chain. The **Type $A_d$ curve** is a variation of the normal Type A curve, characterized by a normal peak pressure (near 0 daPa) but an **abnormally high compliance** (peak off the chart or very high). The "d" stands for **Discontinuity** or **Deep**. #### Why "After Stapedectomy" is Correct: After a stapedectomy, the natural ossicular chain is interrupted and replaced with a prosthesis. This often results in increased mobility or a "floppy" system compared to the original rigid chain. Similarly, **ossicular discontinuity** (e.g., incudostapedial joint dissociation due to trauma) is the classic cause of a Type $A_d$ curve because the tympanic membrane meets very little resistance from the detached ossicles. #### Why Other Options are Incorrect: * **Eustachian Tube Obstruction:** Leads to negative pressure in the middle ear, resulting in a **Type C curve** (peak shifted to the left/negative side). * **Secretory Otitis Media:** The presence of fluid behind the drum restricts all movement, resulting in a **Type B curve** (flat curve with no peak). * **Middle Ear Tumours:** Masses like Glomus jugulare increase the stiffness and mass of the middle ear, typically leading to a **Type B curve** (if the space is filled) or a reduced-amplitude curve. #### High-Yield Clinical Pearls for NEET-PG: * **Type A:** Normal middle ear function. * **Type $A_s$ (S = Stiffness/Shallow):** Normal pressure but low compliance. Seen in **Otosclerosis** and Tympanosclerosis. * **Type B (Flat):** Seen in **Serous Otitis Media** (normal ear canal volume) or **TM perforation** (large ear canal volume). * **Type C:** Indicates negative middle ear pressure; a precursor to ASOM or seen in Eustachian tube dysfunction.

Q: Which device is shown below?

Cochlear implant. ***Cochlear implant*** - The device shows the characteristic **external processor** and **internal implant** components with an **electrode array** that bypasses damaged hair cells to directly stimulate the **auditory nerve**. - Designed for patients with **sensorineural hearing loss** where the cochlea is damaged but the auditory nerve remains functional. *Auditory brainstem implant (ABI)* - An **ABI** is placed directly on the **brainstem** at the cochlear nucleus, bypassing both the cochlea and auditory nerve entirely. - Indicated for patients with **bilateral acoustic neuromas** or **neurofibromatosis type 2** where the auditory nerve is absent or non-functional. *Bone anchored hearing aid (BAHA)* - A **BAHA** uses **bone conduction** through a titanium implant that vibrates the skull to transmit sound directly to the inner ear. - Primarily used for **conductive hearing loss** or **single-sided deafness** where the cochlea functions normally but sound transmission is impaired. *Hearing aid* - A conventional **hearing aid** simply **amplifies sound** and delivers it through the ear canal to the existing hearing mechanism. - Suitable for patients with **mild to moderate hearing loss** where the natural hearing pathway remains partially functional.

Q: Carhart's notch in an audiogram represents the deepest frequency loss at which of the following frequencies?

2 KHz. **Explanation:** **Carhart’s Notch** is a classic audiometric finding pathognomonic for **Otosclerosis**. It is characterized by a mechanical (pseudo) sensorineural hearing loss observed in Bone Conduction (BC) thresholds, despite the inner ear being functionally intact. 1. **Why 2 KHz is Correct:** The notch is most prominent at **2 KHz** because this frequency corresponds to the natural resonant frequency of the ossicular chain. In Otosclerosis, stapes fixation disrupts this normal resonance and reduces the efficiency of the inertial component of bone conduction. This results in an apparent dip in the BC curve specifically at 2 KHz. Importantly, this notch disappears after a successful stapedotomy, proving it is a mechanical artifact rather than true nerve damage. 2. **Why Incorrect Options are Wrong:** * **0.5 KHz (A):** Low frequencies are typically affected by the "Air-Bone Gap" in early Otosclerosis (conductive loss), but the specific BC dip does not occur here. * **4 KHz (C):** A dip at 4 KHz is characteristic of **Noise-Induced Hearing Loss (NIHL)**, known as the "Acoustic Notch" or Boiler-maker's notch. * **8 KHz (D):** High-frequency loss at 8 KHz is usually associated with presbycusis or ototoxicity, not mechanical ossicular fixation. **High-Yield Clinical Pearls for NEET-PG:** * **Schwartz Sign:** A flamingo-pink flush on the promontory seen through the TM (indicates active otosclerosis). * **Gelle’s Test:** Negative in Otosclerosis (no change in hearing with increased ear canal pressure). * **Tympanometry:** Typically shows an **As type** curve (stiffened system). * **Stapedial Reflex:** Usually absent or shows an "on-off" effect in early stages.

Q: Auditory screening is required in children under which of the following conditions?

All of the above. **Explanation:** The correct answer is **All of the above** because each condition listed is a recognized high-risk factor for **Sensorineural Hearing Loss (SNHL)** in neonates and children. 1. **Hyperbilirubinemia (Option A):** Severe jaundice requiring exchange transfusion is a critical risk factor. High levels of unconjugated bilirubin are neurotoxic and can cross the blood-brain barrier, leading to **Kernicterus**. This specifically damages the cochlear nuclei and the auditory nerve, often resulting in **Auditory Neuropathy Spectrum Disorder (ANSD)**. 2. **Prematurity (Option B):** Premature babies (especially those <1500g or born <32 weeks) are at high risk due to underdeveloped auditory systems, prolonged NICU stays, and frequent exposure to hypoxia, acidosis, or ototoxic medications. 3. **Aminoglycoside Therapy (Option C):** Drugs like Gentamicin and Amikacin are notoriously **ototoxic**. They cause permanent damage to the outer hair cells of the cochlea. Screening is essential to detect early-onset hearing loss before it impacts speech development. **Clinical Pearls for NEET-PG:** * **Universal Newborn Hearing Screening (UNHS):** The gold standard protocol is the **"1-3-6" Rule**: Screen by 1 month, Diagnose by 3 months, and Initiate Intervention by 6 months. * **Screening Tools:** **OAE (Otoacoustic Emissions)** is used for initial screening (tests outer hair cell function), while **AABR (Automated Auditory Brainstem Response)** is preferred for NICU graduates as it can detect retrocochlear pathology like ANSD. * **Other High-Risk Factors:** TORCH infections (especially CMV), craniofacial anomalies, and a family history of childhood SNHL.

Q: Cochlear implant is indicated at the minimum age of?

12 months. **Explanation:** **1. Why 12 months is correct:** The FDA and international guidelines currently recommend **12 months** as the minimum age for a cochlear implant (CI) in children with bilateral profound sensorineural hearing loss (SNHL). This age is chosen because it balances the benefits of early neuroplasticity with surgical safety. The first two years of life are the "critical period" for language development; implanting by 12 months allows the child to access auditory stimuli during peak brain plasticity, leading to superior speech and language outcomes compared to later implantation. **2. Why the other options are incorrect:** * **At birth / Intrauterine:** These are technically and physiologically impossible. A CI requires a surgical procedure on the temporal bone, which is not sufficiently developed at birth. Furthermore, hearing loss must be confirmed via objective tests (like ABR/BERA) and a trial of hearing aids must be attempted first. * **24 months:** While children were previously implanted at 24 months, modern advancements in anesthesia and surgical techniques have safely lowered the age to 12 months (and in some specific cases of meningitis-induced ossification, even earlier) to prevent developmental delays. **Clinical Pearls for NEET-PG:** * **Ideal Candidate:** Bilateral profound SNHL (thresholds >90 dB) who show little to no benefit from a 3–6 month trial of powerful hearing aids. * **Prerequisite:** A patent cochlea and a functional **Cochlear Nerve (CN VIII)** must be present (confirmed via MRI/CT). * **Components:** The CI bypasses damaged hair cells to directly stimulate the spiral ganglion cells. * **Meningitis Alert:** If SNHL is post-meningitis, urgent implantation is required regardless of age due to the risk of **Labyrinthitis Ossificans** (cochlear ossification).

Q: A patient presents with a hearing defect. His tuning fork test results were: Weber test - sound from a vibrating tuning fork was louder than normal; Schwabach test - bone conduction was better than normal; and Rinne test - air conduction did not outlast bone conduction. What is the most likely diagnosis?

Conductive deafness in both ears. ### Explanation The clinical findings described point toward **bilateral conductive hearing loss (CHL)**. To arrive at this diagnosis, we must analyze each tuning fork test: 1. **Rinne Test (Negative):** The statement "air conduction did not outlast bone conduction" means **BC > AC**. This is a "Negative Rinne," which is the hallmark of conductive deafness. 2. **Schwabach Test (Prolonged):** When bone conduction is "better than normal" (the patient hears the fork longer than the examiner), it indicates that ambient room noise is not being heard via air conduction, making the patient more sensitive to bone-conducted sounds. This occurs in **CHL**. 3. **Weber Test (Centralized/Louder):** In bilateral symmetrical conductive loss, the Weber test does not lateralize to one side but may be perceived as "louder than normal" or "centralized" because the masking effect of environmental noise is removed. #### Why the other options are incorrect: * **Sensorineural Deafness (SNHL):** Rinne would be positive (AC > BC), Schwabach would be "shortened" (examiner hears it longer), and Weber would lateralize to the better ear. * **Normal Hearing:** Rinne would be positive (AC > BC) and Schwabach would be "equal" to the examiner. * **Mixed Deafness:** While both components exist, the specific combination of a negative Rinne and a *prolonged* Schwabach specifically highlights the conductive pathology. #### High-Yield Clinical Pearls for NEET-PG: * **Rinne Test:** Requires a 256 Hz or 512 Hz fork. A negative Rinne indicates a conductive gap of at least **15–20 dB**. * **Weber Test:** Lateralizes to the **worse ear** in conductive loss and the **better ear** in sensorineural loss. * **ABC (Absolute Bone Conduction) Test:** A variation of Schwabach where the examiner plugs the patient's external canal to eliminate the masking effect of noise. It is **decreased in SNHL** and **normal in CHL**.

Q: A person hears two different tones in the left and right ear when presented with a single tone. What is this condition called?

Binaural diplacusis. **Explanation:** **1. Why Binaural Diplacusis is Correct:** Diplacusis (double hearing) is a clinical phenomenon where a single auditory stimulus is perceived differently by the two ears. **Binaural diplacusis** (specifically *diplacusis binauralis dysharmonica*) occurs when a single frequency is presented to both ears, but the patient perceives a different pitch in each ear. This is typically caused by a lesion in the cochlea (sensory hearing loss), where damage to the hair cells or the basilar membrane alters the frequency-to-place mapping, causing the brain to interpret the same frequency as two distinct tones. **2. Analysis of Incorrect Options:** * **A. Monoaural diplacusis:** In this condition, a single tone is perceived as two different tones or a "fuzzy" sound in the **same ear**. It is often associated with localized cochlear pathology. * **C. Tinnitus:** This refers to the perception of sound (ringing, buzzing, or hissing) in the absence of an external auditory stimulus. It is a "phantom" sound, not a distorted perception of an existing tone. * **D. Increased sensitivity to sound:** This is known as **Hyperacusis**. It is a condition where normal environmental sounds are perceived as uncomfortably loud or painful, often seen in Bell’s palsy (due to stapedius muscle paralysis) or recruitment phenomenon. **3. NEET-PG High-Yield Pearls:** * **Recruitment:** A hallmark of cochlear lesions where there is an abnormal growth in the perception of loudness. * **Diplacusis** is a classic sign of **Cochlear pathology** (e.g., Meniere’s disease). * If a patient hears a sound for a longer duration than the stimulus, it is called **Diplacusis echoica**. * **Metanousis** is another term sometimes used for distorted pitch perception.

Question 1

Type Ad curve in tympanometry is seen in which of the following conditions?

Accepted Answer

After stapedectomy

Answer

Eustachian tube obstruction

Answer

Middle ear tumors

Answer

Secretory otitis media

Question 2

Deafness is seen with which of the following conditions?

Accepted Answer

Congenital QT syndrome

Answer

Essential hypertension

Answer

Marfan syndrome

Answer

Turner syndrome

Question 3

Type Ad curve is seen in?

Accepted Answer

After stapedectomy

Answer

Eustachian tube obstruction

Answer

Middle ear tumours

Answer

Secretory otitis media

Question 4

Which device is shown below?

Accepted Answer

Cochlear implant

Answer

Auditory brainstem implant (ABI)

Answer

Bone anchored hearing aid (BAHA)

Answer

Hearing aid

Question 5

Carhart's notch in an audiogram represents the deepest frequency loss at which of the following frequencies?

Accepted Answer

2 KHz

Answer

0.5 KHz

Answer

4 KHz

Answer

8 KHz

Question 6

Auditory screening is required in children under which of the following conditions?

Accepted Answer

All of the above

Answer

Before exchange transfusion for hyperbilirubinemia

Answer

In premature babies

Answer

Before starting aminoglycoside therapy

Question 7

Subjective interference is present in which of the following audiological tests?

Accepted Answer

Pure tone audiometry

Answer

Impedance audiometry

Answer

Otoacoustic emission

Answer

Brainstem evoked potential

Question 8

Cochlear implant is indicated at the minimum age of?

Accepted Answer

12 months

Answer

At birth

Answer

Intrauterine

Answer

24 months

Question 9

A patient presents with a hearing defect. His tuning fork test results were: Weber test - sound from a vibrating tuning fork was louder than normal; Schwabach test - bone conduction was better than normal; and Rinne test - air conduction did not outlast bone conduction. What is the most likely diagnosis?

Accepted Answer

Conductive deafness in both ears

Answer

Sensorineural deafness in both ears

Answer

Normal hearing

Answer

Both sensorineural and conductive deafness

Question 10

A person hears two different tones in the left and right ear when presented with a single tone. What is this condition called?

Accepted Answer

Binaural diplacusis

Answer

Monoaural diplacusis

Answer

Tinnitus

Answer

Increased sensitivity to sound

Audiology and Speech Disorders — MCQs

Audiology and Speech Disorders — MCQs

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