Audiology and Speech Disorders — MCQs

Audiology and Speech Disorders Indian Medical PG Practice Questions and MCQs

Question 11: Sensorineural deafness is seen in which of the following conditions?

A. Alport's syndrome
B. Pendred syndrome
C. Treacher-Collins syndrome (Correct Answer)
D. Crouzon's disease

Explanation: ### Explanation The question asks to identify which condition is associated with **Sensorineural Hearing Loss (SNHL)**. However, there is a critical distinction to be made regarding the provided options and the "correct" answer marked. **1. Analysis of the Correct Answer (Treacher-Collins Syndrome):** In clinical practice and standard ENT textbooks (like Dhingra), **Treacher-Collins Syndrome** (Mandibulofacial Dysostosis) is primarily associated with **Conductive Hearing Loss (CHL)**. This is due to malformations of the first and second branchial arches, leading to microtia, atresia of the external auditory canal, and ossicular anomalies. While rare cases of SNHL can occur due to inner ear dysplasia, it is classically a prototype for CHL. *Note: If this question appeared in a mock or previous exam with "C" as the answer, it may be due to a specific case-study focus or an error in the question key, as the other options are more classically associated with SNHL.* **2. Analysis of Incorrect Options:** * **Alport’s Syndrome (Option A):** This is a classic cause of **progressive SNHL** associated with glomerulonephritis and ocular defects (lenticonus). It is caused by a mutation in Type IV collagen. * **Pendred Syndrome (Option B):** This is one of the most common causes of **congenital SNHL**. It is characterized by the triad of SNHL, goiter, and a malformed inner ear (Mondini dysplasia or enlarged vestibular aqueduct). * **Crouzon’s Disease (Option D):** Similar to Treacher-Collins, this craniofacial dysostosis typically presents with **Conductive Hearing Loss** due to ossicular fixation or canal stenosis. **3. Clinical Pearls for NEET-PG:** * **SNHL Syndromes:** Alport, Pendred, Usher (SNHL + Retinitis Pigmentosa), Waardenburg (SNHL + White forelock/Heterochromia iridis), and Jervell and Lange-Nielsen (SNHL + Long QT interval). * **CHL Syndromes:** Treacher-Collins, Crouzon, Goldenhar, and Apert syndrome. * **High-Yield Fact:** Pendred syndrome is the most common syndromic cause of congenital SNHL; Alport syndrome SNHL typically starts in late childhood/adolescence.

Question 12: Tone decay test is used for which condition?

A. Meniere's disease
B. Otosclerosis
C. Cochlear deafness
D. Sensorineural deafness (Correct Answer)

Explanation: **Explanation:** The **Tone Decay Test** is a clinical audiological test used to detect **retrocochlear pathology** (lesions involving the 8th cranial nerve). It measures "auditory fatigue," where a patient ceases to hear a continuous pure tone even though the physical stimulus is still present. 1. **Why the Correct Answer is Right:** **Sensorineural deafness (SND)** is a broad category encompassing both cochlear and retrocochlear lesions. However, Tone Decay is a hallmark of **retrocochlear lesions** (like Acoustic Neuroma). In these cases, the auditory nerve fibers cannot maintain sustained firing, leading to a rapid "decay" in perception. While the options provided are slightly broad, Tone Decay is a diagnostic tool specifically for the retrocochlear subtype of sensorineural deafness. 2. **Why Incorrect Options are Wrong:** * **Meniere's Disease & Cochlear Deafness:** These represent **cochlear pathology**. Cochlear lesions typically exhibit **Recruitment** (an abnormal growth in loudness perception) rather than tone decay. In cochlear deafness, the tone decay is usually absent or minimal (<15 dB). * **Otosclerosis:** This is a cause of **conductive hearing loss**. Tone decay is a phenomenon of the neural pathway and is not seen in conductive pathologies. **Clinical Pearls for NEET-PG:** * **Significance:** A decay of **>25 dB** is highly suggestive of a retrocochlear lesion (e.g., Vestibular Schwannoma). * **Recruitment vs. Tone Decay:** * **Recruitment (+):** Cochlear lesions (Meniere’s). * **Tone Decay (+):** Retrocochlear lesions (Acoustic Neuroma). * **Common Tests for Retrocochlear Lesions:** Tone Decay Test, absent Stapedial Reflex, and prolonged latency on BERA (Brainstem Evoked Response Audiometry).

Question 13: A negative Rinne's test using a 256 Hz tuning fork indicates a minimum air-bone gap of which of the following values?

A. 10 dB
B. 15 dB (Correct Answer)
C. 20 dB
D. 25 dB

Explanation: **Explanation:** The Rinne’s test is a clinical tuning fork test used to compare Air Conduction (AC) and Bone Conduction (BC). A **Negative Rinne** (BC > AC) indicates a conductive hearing loss (CHL). The sensitivity of this test to detect an air-bone gap (ABG) depends significantly on the frequency of the tuning fork used. **1. Why 15 dB is correct:** A 256 Hz tuning fork is highly sensitive to small conductive deficits. It typically turns "negative" (meaning the patient hears the sound louder or longer via bone conduction) when the air-bone gap reaches approximately **15 dB**. Because it can detect such a small gap, it is often used to identify early or mild conductive hearing loss. **2. Analysis of Incorrect Options:** * **10 dB (Option A):** This gap is usually too small to consistently reverse the Rinne result; the patient will likely still report a "Positive" or "Equal" Rinne. * **20 dB (Option C):** While a 20 dB gap will certainly result in a negative Rinne with a 256 Hz fork, it is not the *minimum* threshold required. * **25-30 dB (Option D):** This is the threshold required to turn a **512 Hz** tuning fork negative. A 512 Hz fork is the standard for routine clinical practice because it is less affected by ambient noise and tactile vibration than the 256 Hz fork. **High-Yield Clinical Pearls for NEET-PG:** * **Standard Fork:** The **512 Hz** tuning fork is the most preferred for Rinne’s test in clinical settings. * **Frequency vs. ABG:** * **256 Hz:** Negative at **15 dB** ABG. * **512 Hz:** Negative at **20–30 dB** ABG. * **1024 Hz:** Negative at **35–40 dB** ABG. * **False Negative Rinne:** Occurs in severe unilateral Sensorineural Hearing Loss (SNHL) where the sound is perceived by the opposite (better) ear via bone conduction. * **Rinne Test Rule:** A "Positive Rinne" (AC > BC) is seen in both normal hearing and SNHL. A "Negative Rinne" (BC > AC) is diagnostic of Conductive Hearing Loss.

Question 14: What is the typical frequency range to which the human ear is most sensitive?

A. 500-3500 Hz (Correct Answer)
B. 1000-3000 Hz
C. 300-5000 Hz
D. 5000-8000 Hz

Explanation: **Explanation:** The human ear is capable of perceiving frequencies from **20 Hz to 20,000 Hz**. However, its sensitivity is not uniform across this spectrum. The range of **500 to 3500 Hz** is considered the most sensitive because it encompasses the **"Speech Frequencies."** Most human speech sounds, particularly consonants which provide clarity, fall within this window. Evolutionarily, the external auditory canal acts as a resonator, specifically amplifying frequencies around 3000 Hz, which aligns with this peak sensitivity zone. **Analysis of Options:** * **A (Correct):** This range covers the critical frequencies for speech perception and matches the resonance characteristics of the human ear canal. * **B (Incorrect):** While 1000-3000 Hz is a very sensitive sub-segment, it is too narrow and excludes the lower speech frequencies (500-1000 Hz) essential for vowel recognition. * **C (Incorrect):** This range is too broad. While we can hear these frequencies, the ear's threshold of hearing is significantly higher (less sensitive) at 300 Hz and 5000 Hz compared to the 1000-3000 Hz range. * **D (Incorrect):** These are high frequencies. Sensitivity drops significantly above 4000 Hz, and these frequencies are the first to be lost in Presbycusis or Noise-Induced Hearing Loss. **High-Yield Clinical Pearls for NEET-PG:** * **Speech Frequencies:** For clinical audiometry, the frequencies **500, 1000, and 2000 Hz** are used to calculate the Pure Tone Average (PTA). * **Resonance:** The external auditory canal (approx. 2.5 cm long) acts as a closed-ended tube, providing a natural boost of **10-15 dB** at its resonant frequency of **~3000 Hz**. * **Acoustic Dip:** In Noise-Induced Hearing Loss (NIHL), the earliest damage typically occurs at **4000 Hz** (the 4kHz notch).

Question 15: Which of the following is FALSE about Pendred syndrome?

A. Associated with a mutation in 7q.
B. Can present with goiter.
C. Associated with thyroglossal cyst. (Correct Answer)
D. Associated with congenital sensorineural hearing loss.

Explanation: **Explanation:** Pendred syndrome is an autosomal recessive disorder characterized by the triad of **congenital sensorineural hearing loss (SNHL)**, **goiter**, and a positive **Perchlorate discharge test**. **Why Option C is the correct (False) statement:** Pendred syndrome is associated with a **dyshormonogenetic goiter** (a defect in iodine organification), not a thyroglossal cyst. A thyroglossal cyst is a congenital midline neck lump resulting from the persistent tract of the descending thyroid gland during embryogenesis; it has no pathological link to Pendred syndrome. **Analysis of other options:** * **Option A (Mutation in 7q):** This is true. The syndrome is caused by a mutation in the **SLC26A4 gene** located on the long arm of chromosome 7 (7q31), which encodes the protein **pendrin** (an anion transporter). * **Option B (Goiter):** This is true. Patients typically develop a multinodular goiter in late childhood or early puberty. While they are usually euthyroid, the thyroid gland is inefficient at trapping iodine. * **Option D (Congenital SNHL):** This is true. The hearing loss is typically bilateral, severe to profound, and prelingual. **High-Yield Clinical Pearls for NEET-PG:** * **Radiological Hallmark:** The most common radiological finding is an **Enlarged Vestibular Aqueduct (EVA)**, often associated with **Mondini dysplasia** (incomplete coiling of the cochlea). * **Diagnostic Test:** The **Perchlorate discharge test** is used to identify the iodine organification defect (though genetic testing is now the gold standard). * **Inheritance:** It is the most common cause of **syndromic** genetic hearing loss. * **Mnemonic:** Remember the **"P"s**: **P**endred, **P**endrin gene, **P**erchlorate test, **P**artial cochlear dysplasia (Mondini).

Question 16: In which of the following conditions is a continuous tracing above a pulsed tracing used in Bekesy audiometry?

A. Otosclerosis
B. Ototoxicity
C. Non-organic hearing loss (Correct Answer)
D. Meniere's disease

Explanation: ### Explanation **Bekesy Audiometry** is a self-recording audiometric test where the patient tracks their own threshold. It uses two types of stimuli: a **Pulsed (P) tone** and a **Continuous (C) tone**. #### Why the Correct Answer is Right In **Non-organic hearing loss (Malingering/Functional hearing loss)**, the patient typically shows a **Type V Bekesy pattern**. In this pattern, the **Continuous (C) tracing is recorded at a lower intensity (above) than the Pulsed (P) tracing**. * **The Concept:** This is a "paradoxical" result. Normally, a continuous tone is harder to hear due to adaptation, so it should be below the pulsed tracing. However, a malingerer uses the loudness of the tone as a reference to fake their loss. Because a pulsed tone sounds louder than a continuous tone of the same intensity, the patient mistakenly signals a threshold for the pulsed tone at a higher intensity (lower on the graph) than the continuous one. #### Why Other Options are Wrong * **Otosclerosis (Option A):** Shows a **Type I pattern** (P and C tracings overlap). This is characteristic of conductive hearing loss or normal hearing. * **Ototoxicity (Option B):** Typically results in a **Type II pattern** (C drops below P at high frequencies, usually >1000 Hz) due to cochlear damage and recruitment. * **Meniere’s Disease (Option D):** Also shows a **Type II pattern**. The gap between P and C is small (5–20 dB), indicating cochlear pathology and the presence of recruitment. #### High-Yield Clinical Pearls for NEET-PG * **Type I:** Normal/Conductive loss (Otosclerosis, CSOM). * **Type II:** Cochlear loss (Meniere’s, Presbycusis, Ototoxicity). Shows recruitment. * **Type III & IV:** Retrocochlear loss (Acoustic Neuroma). Type III shows a dramatic drop of C below P (>20 dB) starting at low frequencies; Type IV shows C below P at all frequencies. * **Type V:** Non-organic/Malingering (C above P). Remember: **"V is for Volitional/Victory for the Malingerer."**

Question 17: Which of the following is NOT true regarding King Kopetzky syndrome?

A. Also known as Auditory stress disorder
B. Difficulty in hearing in presence of background noise
C. Commonly seen in young females (Correct Answer)
D. Patients have a high family prevalence of deafness

Explanation: **King-Kopetzky Syndrome**, also known as **Obscure Auditory Dysfunction (OAD)**, refers to a clinical condition where individuals complain of significant difficulty hearing in the presence of background noise despite having a **normal pure-tone audiogram**. ### Explanation of Options: * **Correct Answer (C):** This statement is false. King-Kopetzky syndrome is **commonly seen in young males**, not females. It is often associated with psychological factors or subtle auditory processing deficits rather than structural ear pathology. * **Option A:** It is indeed also known as **Auditory Stress Disorder**. The term reflects the patient's struggle to process speech signals in challenging acoustic environments, leading to communicative stress. * **Option B:** The hallmark clinical feature is the **difficulty in hearing in background noise** (speech-in-noise distress). While their hearing thresholds are normal in a quiet cabin (audiometry), they struggle in social gatherings or noisy rooms. * **Option D:** Studies have shown a **high family prevalence of deafness** or hearing impairment in these patients, suggesting a possible genetic predisposition to subtle auditory processing inefficiencies. ### High-Yield Clinical Pearls for NEET-PG: * **Diagnosis:** Diagnosis is made when the patient has a significant "Speech-in-Noise" (SIN) deficit but a **Normal Pure Tone Audiogram (PTA)**. * **Demographics:** Most prevalent in the **2nd and 3rd decades** of life, with a male preponderance. * **Management:** Management usually involves counseling, auditory training, and occasionally the use of mild gain hearing aids or FM systems to improve the signal-to-noise ratio. * **Differential:** Must be distinguished from **Auditory Neuropathy Spectrum Disorder (ANSD)**, where OAEs are present but ABR is absent/abnormal. In King-Kopetzky, both OAE and ABR are typically normal.

Question 18: What is indicated by the term 'Phon'?

A. Psycho-acoustic index of loudness (Correct Answer)
B. Noise induced hearing loss
C. Sound spectrum
D. Octave Band Frequency Analyzer

Explanation: **Explanation:** The term **Phon** is the unit of **loudness level**. It is a **psycho-acoustic index** because it measures the subjective perception of loudness rather than the physical intensity of sound (which is measured in Decibels). By definition, 1 Phon is equal to 1 dB sound pressure level (SPL) at a frequency of **1000 Hz**. Because the human ear is not equally sensitive to all frequencies, two sounds with the same decibel level but different frequencies may be perceived as having different loudness. The Phon scale uses "Equal Loudness Contours" (Fletcher-Munson curves) to represent sounds that appear equally loud to a human listener. **Analysis of Incorrect Options:** * **B. Noise-induced hearing loss (NIHL):** This is a clinical condition characterized by a "4 kHz notch" on an audiogram. It is measured in decibels of hearing loss, not Phons. * **C. Sound spectrum:** This refers to the distribution of energy across different frequencies in a sound wave, usually visualized via a spectrogram. * **D. Octave Band Frequency Analyzer:** This is a physical instrument used to measure sound energy within specific frequency bands to assess noise levels in environments; it is a tool, not a unit of measurement. **Clinical Pearls for NEET-PG:** * **Phon vs. Sone:** While **Phon** measures loudness *level* (logarithmic), the **Sone** is the unit of *subjective loudness* (linear). 1 Sone is defined as the loudness of a 40 dB SPL tone at 1000 Hz (40 Phons). * **Doubling Rule:** An increase of **10 Phons** is generally perceived by the human ear as a **doubling** of loudness. * **Reference Frequency:** Always remember that 1000 Hz is the standard reference point for defining both Phons and Sones.

Question 19: Exposure to noise above which decibel level causes permanent hearing loss?

A. 90 dB
B. 100 dB
C. 125 dB
D. 160 dB (Correct Answer)

Explanation: **Explanation:** The correct answer is **160 dB**. This question differentiates between the gradual onset of Noise-Induced Hearing Loss (NIHL) and immediate, irreversible **Acoustic Trauma**. 1. **Why 160 dB is correct:** Exposure to sound levels of **160 dB and above** causes instantaneous and permanent hearing loss. At this intensity, the mechanical energy is so great that it causes direct physical disruption of the inner ear structures, such as the Organ of Corti, and may even cause tympanic membrane perforation or ossicular disruption. This is classified as acoustic trauma rather than chronic noise exposure. 2. **Why other options are incorrect:** * **90 dB:** This is the "permissible" limit for 8 hours of exposure in an industrial setting. While chronic exposure to 90 dB leads to gradual NIHL (temporary or permanent threshold shifts), it does not cause immediate permanent loss from a single exposure. * **100 dB:** Exposure at this level is hazardous over shorter durations (approx. 2 hours), but the damage is typically cumulative rather than instantaneous. * **125 dB:** This level marks the **Threshold of Pain**. While extremely uncomfortable and damaging over short periods, it is the 160 dB mark that is classically cited in otolaryngology for immediate, permanent mechanical destruction. **Clinical Pearls for NEET-PG:** * **NIHL Pathology:** Primarily affects the **outer hair cells** of the basal turn of the cochlea. * **Audiometric Notch:** Characteristically seen at **4000 Hz (4 kHz)**; this is known as **Boiler-maker's notch**. * **Rule of thumb:** For every 5 dB increase above 90 dB, the safe exposure time is halved (e.g., 90 dB for 8 hours, 95 dB for 4 hours). * **Presbycusis vs. NIHL:** Presbycusis typically shows a down-sloping high-frequency loss, whereas NIHL specifically shows the 4 kHz dip with recovery at 8 kHz.

Question 20: A flat and dome-shaped graph in a tympanogram is typically found in which condition?

A. Otosclerosis
B. Ossicular discontinuity
C. Tympanic membrane perforation
D. Middle ear fluid (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Middle ear fluid (Otitis Media with Effusion)** **Understanding the Concept:** A tympanogram measures the compliance (mobility) of the tympanic membrane (TM) as air pressure in the external canal is varied. * **Middle ear fluid (Serous Otitis Media)** creates a **Type B Tympanogram**. * Because fluid is non-compressible and fills the middle ear space, the TM becomes immobile. No matter how much air pressure is applied, the compliance remains low, resulting in a **flat or dome-shaped graph** with no identifiable peak. **Analysis of Incorrect Options:** * **A. Otosclerosis:** Characterized by a **Type As (Stiff)** tympanogram. The stapes is fixed, reducing the amplitude of the peak, but a peak still occurs at normal atmospheric pressure (0 daPa). * **B. Ossicular discontinuity:** Characterized by a **Type Ad (Deep/Disconnected)** tympanogram. The lack of resistance from the ossicular chain leads to hyper-mobility of the TM, resulting in an off-the-chart high peak. * **C. Tympanic membrane perforation:** While this also produces a flat (Type B) tracing, the **Ear Canal Volume (ECV)** is the differentiator. In perforation, the ECV is **large** (measuring the canal + middle ear space), whereas in middle ear fluid, the ECV is **normal**. **High-Yield Clinical Pearls for NEET-PG:** * **Type A:** Normal (Peak at ±50 daPa). * **Type B:** Flat (Fluid, Cholesteatoma, or Perforation). * **Type C:** Negative pressure (Peak at < -150 daPa); seen in **Eustachian tube dysfunction**. * **Golden Rule:** If the question mentions a "Flat graph" + "Large Canal Volume," think **Perforation**. If it mentions "Flat graph" + "Normal Canal Volume," think **Fluid/Effusion**.

Practice by Chapter

Hearing Assessment Techniques

Practice Questions

Tympanometry and Acoustic Reflexes

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Otoacoustic Emissions

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Auditory Brainstem Response

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Hearing Aids

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Cochlear Implants

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Bone-Anchored Hearing Devices

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Speech and Language Development

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Articulation Disorders

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Stuttering

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Dysphonia

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Rehabilitation of Hearing-Impaired Children

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