Audiology and Speech Disorders Practice Questions

Q: What type of tympanogram is seen in otitis media with effusion?

Type B. **Explanation:** Tympanometry measures the compliance of the tympanic membrane (TM) under varying air pressure. In **Otitis Media with Effusion (OME)**, the middle ear is filled with fluid instead of air. This fluid prevents the TM from vibrating, resulting in a **Type B (Flat) tympanogram**. * **Why Type B is correct:** A Type B curve shows little to no change in compliance regardless of the pressure applied. This "flat" curve indicates restricted TM mobility, typically due to middle ear fluid (OME), gross thickening of the TM, or a patent grommet/perforation (differentiated by ear canal volume). **Analysis of Incorrect Options:** * **Type A:** Represents normal middle ear function. The peak compliance occurs at 0 daPa (atmospheric pressure), indicating an air-filled middle ear with a mobile TM. * **Type C:** Shows a peak shifted to significant negative pressure (beyond -150 daPa). This indicates **Eustachian tube dysfunction**, often a precursor to OME, where the middle ear is air-filled but under-ventilated. * **Type D (and E):** These are "notched" curves seen in conditions of hyper-mobility, such as **ossicular discontinuity** or a monomeric (scarred) TM. **High-Yield Clinical Pearls for NEET-PG:** * **Type As (S-Stiff):** Low peak; seen in **Otosclerosis** or tympanosclerosis. * **Type Ad (D-Deep/Discontinuity):** High peak; seen in **Ossicular Disconnection**. * **OME Management:** In children, the first-line treatment is often "watchful waiting" for 3 months. If persistent, myringotomy with grommet insertion is the surgical treatment of choice. * **Gold Standard for OME:** While tympanometry is the most objective screening tool, **pneumatic otoscopy** remains the clinical gold standard for diagnosis.

Q: What is the sound intensity required to elicit stapedial reflexes?

70 - 90 dB. ### Explanation **1. Why 70 - 90 dB is Correct:** The stapedial reflex (acoustic reflex) is an involuntary muscle contraction of the stapedius muscle in response to high-intensity sound stimuli. In a person with normal hearing, this reflex is typically elicited when a sound reaches an intensity of **70 to 90 dB above their hearing threshold (dB SL)**. The physiological purpose of this reflex is to stiffen the ossicular chain, thereby increasing the impedance of the middle ear and protecting the delicate inner ear (cochlea) from noise-induced damage. **2. Analysis of Incorrect Options:** * **A & D (30 - 65 dB):** These intensities represent normal conversational speech or moderate noise. If the reflex were triggered at these low levels, it would interfere with everyday communication and sound perception by unnecessarily attenuating normal sounds. * **C (90 - 100 dB):** While the reflex can occur at these levels, 70-90 dB is the standard clinical range for a healthy ear. Thresholds consistently above 95 dB are often considered absent or indicative of retrocochlear pathology (e.g., Vestibular Schwannoma). **3. Clinical Pearls for NEET-PG:** * **Reflex Arc:** Afferent limb is the **CN VIII** (Vestibulocochlear nerve); Efferent limb is the **CN VII** (Facial nerve). * **Metz Test:** Used to detect **Recruitment**. If the difference between the hearing threshold and the reflex threshold is less than 60 dB, it indicates cochlear hearing loss (Recruitment positive). * **Reflex Decay:** If the reflex cannot be maintained for 10 seconds at 10 dB above threshold, it suggests **Retrocochlear pathology** (e.g., Acoustic Neuroma). * **Otosclerosis:** The reflex is typically **absent** due to the fixation of the stapes footplate.

Q: Which one of the following tests is used to detect malingering?

Stenger's test. **Explanation:** **Stenger’s Test** is the gold standard clinical test for detecting **pseudohypacusis (malingering)**, specifically in cases of unilateral functional hearing loss. It is based on the **Stenger Principle**: if two identical tones are presented to both ears simultaneously, the brain only perceives the sound in the ear where the tone is louder. * **Mechanism:** In a malingerer claiming deafness in one ear, a loud tone is presented to the "bad" ear and a faint tone to the "good" ear. The patient will hear the sound in the "bad" ear (due to the Stenger principle) but will deny hearing anything at all to maintain the deception, thereby failing the test. **Analysis of Incorrect Options:** * **B. Buinge’s Test:** This is not a standard ENT test. It is likely a distractor or a misspelling of Bing’s test (which uses a tuning fork to assess the occlusion effect in conductive hearing loss). * **C. Weber’s Test:** A tuning fork test used to differentiate between conductive and sensorineural hearing loss by assessing bone conduction midline lateralization. * **D. Rinne’s Test:** A tuning fork test used to compare air conduction (AC) and bone conduction (BC) in an individual ear to detect conductive hearing loss. **High-Yield Clinical Pearls for NEET-PG:** * **Other tests for malingering:** Lombard’s test (voice reflex), Doerfler-Stewart test, and Objective tests like **ABR (Auditory Brainstem Response)** and **OAE (Otoacoustic Emissions)**. * **Pure Tone Audiometry (PTA) in Malingerers:** Often shows inconsistent thresholds (test-retest reliability >10-15 dB). * **Shadow Curve:** In true unilateral total deafness, a "shadow curve" should be present due to cross-hearing; its absence suggests malingering.

Q: What type of tympanogram is typically observed in a patient with a thick tympanic membrane?

Type B. **Explanation:** The correct answer is **Type B (Flat Tympanogram)**. **1. Why Type B is correct:** A tympanogram measures the compliance (mobility) of the tympanic membrane (TM) and the middle ear system. A **thickened tympanic membrane** (often due to tympanosclerosis or chronic myringitis) increases the mass and stiffness of the drum. This significantly reduces its mobility, resulting in a "flat" trace with no identifiable peak of maximum compliance, regardless of the pressure changes in the external ear canal. **2. Why other options are incorrect:** * **Type A:** Represents normal middle ear function with normal pressure and compliance. A thickened TM would not show normal mobility. * **Type C:** Shows a peak shifted to negative pressure (beyond -100 daPa). This indicates Eustachian tube dysfunction, not a change in the physical thickness of the membrane itself. * **Type D:** This is not a standard Jerger classification. (Note: Type $A_d$ is used for hypermobile membranes, such as in ossicular discontinuity). **Clinical Pearls for NEET-PG:** * **Type B (Flat) Differential Diagnosis:** * **Fluid in middle ear (Serous Otitis Media):** Most common cause; normal ear canal volume. * **Thickened TM/Cholesteatoma:** Reduced mobility; normal ear canal volume. * **Perforation or Patent PE tube:** Large ear canal volume (crucial for MCQ differentiation). * **Type $A_s$ (Shallow):** Seen in **Otosclerosis** or partial fixation of the ossicles (stiff system but still shows a peak). * **Type $A_d$ (Deep/Disconnected):** Seen in **Ossicular Discontinuity** or a thin, monomeric TM.

Q: All of the following are tuning fork tests except?

Stenger's test. **Explanation:** The correct answer is **B. Stenger’s test**. **Why Stenger’s test is the correct answer:** Stenger’s test is not a tuning fork test; it is a **behavioral test** performed using an **audiometer**. It is based on the **Stenger principle**, which states that if two identical tones are presented to both ears simultaneously, the brain only perceives the sound in the ear where it is louder. This test is the gold standard for detecting **unilateral functional hearing loss (malingering)**. If a patient claims deafness in one ear but fails to hear the loud tone in that ear because they are "faking," they will stop responding altogether, indicating a positive Stenger result. **Why the other options are incorrect:** * **A. Schwabach test:** A tuning fork test that compares the bone conduction of the patient with that of the examiner (assuming the examiner has normal hearing). It is "prolonged" in conductive hearing loss and "shortened" in sensorineural hearing loss. * **C. Rinne test:** The most common tuning fork test used to compare air conduction (AC) and bone conduction (BC) in the same ear. * **D. Weber test:** A tuning fork test used for lateralization. The sound lateralizes to the poorer ear in conductive loss and the better ear in sensorineural loss. **Clinical Pearls for NEET-PG:** * **Tuning Fork Frequency:** The **512 Hz** fork is preferred for routine clinical testing as it provides a good balance between bone conduction vibration and decay time. * **Gelle’s Test:** Another tuning fork test used to check the mobility of the ossicles (specifically the stapes in Otosclerosis). * **ABC (Absolute Bone Conduction) Test:** A modification of the Schwabach test where the external auditory canal is occluded to eliminate ambient noise.

Q: Which of the following is NOT a test for detecting damage to the cochlea?

Caloric test. To understand this question, one must distinguish between the two primary functions of the inner ear (Labyrinth): **Hearing** (Cochlea) and **Balance** (Vestibular system). ### **Why Caloric Test is the Correct Answer** The **Caloric test** (part of the Fitzgerald-Hallpike maneuver) is a specific test of the **vestibular system**, specifically the **lateral semicircular canal** and the superior vestibular nerve. By irrigating the ear with warm or cold water/air, we induce convection currents in the endolymph to evaluate the Vestibulo-Ocular Reflex (VOR). It has no role in assessing hearing or cochlear function. ### **Analysis of Incorrect Options (Tests for Cochlea)** * **Weber Test:** A tuning fork test (512 Hz) that uses bone conduction to detect lateralization. It helps differentiate between conductive and sensorineural hearing loss (SNHL). In SNHL, the sound lateralizes to the better-functioning cochlea. * **Rinne Test:** Compares Air Conduction (AC) to Bone Conduction (BC). A "True Negative" Rinne (BC > AC) or a "Positive" Rinne (AC > BC) helps clinicians screen for middle ear or cochlear pathology. * **Audiometry (ABC):** Pure Tone Audiometry is the gold standard for quantifying hearing loss. It directly measures the threshold of the cochlea's ability to perceive different frequencies. ### **Clinical Pearls for NEET-PG** * **COWS Mnemonic:** For the Caloric test, **C**old **O**pposite, **W**arm **S**ame (refers to the direction of the fast phase of nystagmus). * **Dead Labyrinth:** A total loss of both cochlear and vestibular function will result in an absent caloric response and profound SNHL. * **High-Yield Fact:** The **Gelle’s test** is used for otosclerosis (stapes fixation), while the **Bing test** evaluates the occlusion effect; both are tuning fork tests related to hearing, not balance.

Q: What is the absolute indication for cochlear implantation?

Auditory nerve. **Explanation:** The core principle of a **Cochlear Implant (CI)** is to bypass damaged or absent hair cells in the cochlea and provide direct electrical stimulation to the **Auditory Nerve (Cochlear Nerve)**. 1. **Why the Auditory Nerve is the Correct Answer:** For a cochlear implant to function, the "bridge" between the device and the brain must be intact. The electrode array placed in the scala tympani stimulates the **Spiral Ganglion cells**, which are the first-order neurons of the auditory pathway. These neurons coalesce to form the **Auditory Nerve**. If the auditory nerve is absent (aplasia) or severely damaged, the electrical signals from the implant cannot reach the brain, making the procedure futile. Therefore, an intact auditory nerve is the **absolute prerequisite** for CI. 2. **Why other options are incorrect:** * **Outer Hair Cells (OHC) & Inner Hair Cells (IHC):** Damage to these cells is the most common cause of sensorineural hearing loss. CI is specifically designed to **replace** their function. Thus, their absence is an indication *for* the surgery, not a requirement for the device to work. * **Spiral Ganglion Cells:** While these cells are the target of stimulation, they are part of the auditory nerve complex. In clinical practice and exam terminology, the integrity of the "Auditory Nerve" as a whole is the definitive anatomical requirement. **Clinical Pearls for NEET-PG:** * **Ideal Candidate:** Bilateral severe-to-profound sensorineural hearing loss (SNHL) who derive minimal benefit from hearing aids. * **Absolute Contraindications:** Bilateral Auditory Nerve Aplasia and Cochlear Aplasia (Michel deformity). * **Imaging:** HRCT Temporal Bone and MRI (Internal Auditory Canal) are mandatory to assess the patency of the cochlea and the presence of the auditory nerve. * **Brainstem Implant:** If the auditory nerve is absent, an **Auditory Brainstem Implant (ABI)** is indicated instead of a CI.

Q: What is the initial screening test for newborn hearing disorder?

Otoacoustic Emissions (OAE). **Explanation:** The gold standard for **Universal Newborn Hearing Screening (UNHS)** follows a staged protocol, where **Otoacoustic Emissions (OAE)** is the preferred initial screening test. **1. Why OAE is the Correct Answer:** OAEs are low-level sounds produced by the **Outer Hair Cells (OHC)** of the cochlea. The test is non-invasive, quick (takes about 1 minute), objective, and does not require a specialist to perform. It is highly sensitive in detecting cochlear hearing loss. If a newborn "fails" the OAE, they are then referred for an ABR to confirm the diagnosis. **2. Analysis of Incorrect Options:** * **Auditory Brainstem Response (ABR):** While ABR is the most definitive objective test for hearing and is used to diagnose **Auditory Neuropathy**, it is more expensive and time-consuming. It is used as a **second-tier** screening tool or for confirmation after a failed OAE. * **Free Field Audiometry:** This is a subjective behavioral test used for older infants (usually >6 months) who can localize sound. It is not suitable for newborn screening. * **Visual Reinforcement Audiometry (VRA):** This is a behavioral test used for children aged **6 months to 2.5 years**. It relies on the child turning their head toward a sound source in response to a visual reward. **Clinical Pearls for NEET-PG:** * **Screening Protocol:** OAE is done first $\rightarrow$ if failed, repeat OAE $\rightarrow$ if failed again, perform **Automated ABR (AABR)**. * **Target:** The goal is the **1-3-6 Rule**: Screening by **1 month**, Diagnosis by **3 months**, and Intervention (Hearing aids/Cochlear implant) by **6 months**. * **Limitation:** OAE cannot detect **Retro-cochlear lesions** (e.g., Auditory Neuropathy Spectrum Disorder); ABR is required for these cases.

Question 1

What type of tympanogram is seen in otitis media with effusion?

Accepted Answer

Type B

Answer

Type A

Answer

Type C

Answer

Type D

Question 2

What is the sound intensity required to elicit stapedial reflexes?

Accepted Answer

70 - 90 dB

Answer

45 - 65 dB

Answer

90 - 100 dB

Answer

30 - 45 dB

Question 3

Which one of the following tests is used to detect malingering?

Accepted Answer

Stenger's test

Answer

Buinge's test

Answer

Weber's test

Answer

Rinne's test

Question 4

What type of tympanogram is typically observed in a patient with a thick tympanic membrane?

Accepted Answer

Type B

Answer

Type A

Answer

Type C

Answer

Type D

Question 5

All of the following are tuning fork tests except?

Accepted Answer

Stenger's test

Answer

Schwabach test

Answer

Rinne test

Answer

Weber test

Question 6

Which of the following is NOT a test for detecting damage to the cochlea?

Accepted Answer

Caloric test

Answer

Weber test

Answer

Rinne test

Answer

Audiometry basic (ABC) test

Question 7

What is the absolute indication for cochlear implantation?

Accepted Answer

Auditory nerve

Answer

Outer hair cell

Answer

Inner hair cell

Answer

Spiral ganglion cell

Question 8

What is the initial screening test for newborn hearing disorder?

Accepted Answer

Otoacoustic Emissions (OAE)

Answer

Auditory Brainstem Response (ABR)

Answer

Free Field Audiometry

Answer

Visual Reinforcement Audiometry

Question 9

All are true about electrocochleography except?

Accepted Answer

Action potential is produced by inner hair cells and positive waves.

Answer

The electrode must be kept close to the source of amplitude.

Answer

Cochlear microphonic is produced from the outer hair cells of the cochlea.

Answer

Mostly used in monitoring Meniere's disease.

Question 10

All are true about stapedial reflex except?

Accepted Answer

The center of the reflex is in the auditory cortex.

Answer

Used to find non-organic hearing loss.

Answer

Tests 7th and 8th nerve function.

Answer

Differentiates cochlear and retrocochlear hearing loss.

Audiology and Speech Disorders — MCQs

Audiology and Speech Disorders — MCQs

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