Audiology and Speech Disorders Practice Questions

Q: A cochlear implant can be used in all of the following conditions causing bilateral severe to profound hearing loss, except:

Section of Cranial Nerve VIII. ### Explanation The fundamental principle of a **Cochlear Implant (CI)** is that it bypasses the damaged hair cells of the cochlea and directly stimulates the **spiral ganglion cells** of the **Cochlear Nerve (Cranial Nerve VIII)**. For a CI to function, the auditory nerve must be anatomically and functionally intact to carry electrical impulses to the brainstem. **Why Option D is Correct:** In a **Section of Cranial Nerve VIII** (e.g., following surgery for a large Vestibular Schwannoma), the pathway between the cochlea and the brain is severed. Since the CI relies on this nerve to transmit signals, it becomes useless. In such cases, an **Auditory Brainstem Implant (ABI)** is the preferred management, as it bypasses the nerve entirely to stimulate the cochlear nuclei. **Why the other options are incorrect:** * **Meningitis (A):** This is a common cause of profound deafness due to labyrinthitis ossificans (ossification of the cochlea). While it makes surgery technically challenging, a CI is still indicated (often urgently before total ossification occurs). * **Otosclerosis (B):** Advanced "Far-advanced Otosclerosis" causes sensorineural hearing loss due to toxic metabolites in the inner ear. The nerve remains intact, making these patients excellent candidates for CI. * **Ototoxic drugs (C):** Drugs like aminoglycosides destroy the hair cells in the Organ of Corti but typically spare the auditory nerve fibers, allowing successful stimulation via CI. **High-Yield Pearls for NEET-PG:** * **Prerequisite for CI:** A functional Auditory Nerve (CN VIII). * **Site of Electrode Placement:** Usually the **Scala Tympani** via the Round Window. * **Most common cause of CI failure:** Electrode displacement or device malfunction. * **Mondini Deformity:** CI is possible and indicated. * **Michel Aplasia:** CI is **contraindicated** (complete absence of inner ear structures); ABI is required.

Q: In the Bing test, alternately compressing and relaxing the tragus causes the sound to increase and decrease. This finding indicates:

Sensorineural hearing loss. ### Explanation The **Bing test** is a tuning fork test used to differentiate between conductive hearing loss (CHL) and sensorineural hearing loss (SNHL) by assessing the **occlusion effect**. #### 1. Why Sensorineural Hearing Loss is Correct In a normal ear or an ear with SNHL, the external auditory canal is open. When the canal is artificially occluded (by pressing the tragus or using a finger), the loudness of a bone-conducted sound increases. This is because occlusion prevents the escape of low-frequency sound waves from the canal, reflecting them back to the tympanic membrane. * **Positive Bing Test:** If the patient perceives the sound as **pulsating** (louder when the tragus is pressed and softer when released), it indicates a normal middle ear mechanism. This occurs in **normal hearing** and **SNHL**. #### 2. Why the Other Options are Incorrect * **Negative Bing Test:** In conditions where a **conductive hearing loss** is already present (Options B, C, and D), the ear is effectively "already occluded" by the pathology (fluid, ossicular fixation, or perforation). * **Otosclerosis (C) and Adhesive Otitis Media (B):** These involve ossicular stiffness. Since a conductive block already exists, manual occlusion of the tragus produces **no change** in sound intensity. * **CSOM (D):** Middle ear pathology and/or perforation eliminate the occlusion effect. #### 3. Clinical Pearls for NEET-PG * **The Concept:** Bing test assesses the **Occlusion Effect**. * **Positive Bing:** Sound fluctuates (Normal/SNHL). * **Negative Bing:** No change in sound (CHL). * **Comparison:** The Bing test is physiologically similar to the **Gelle’s test**, which uses a Siegle’s speculum to increase air pressure in the canal. A "normal" Gelle’s (sound decreases with pressure) also indicates an intact ossicular chain/SNHL, while a "negative" Gelle’s indicates Otosclerosis.

Q: Acoustic reflex is lost in case of which of the following conditions?

Stapedial palsy. The acoustic reflex (stapedial reflex) is an involuntary muscle contraction in the middle ear in response to high-intensity sound. It involves the **Stapedius muscle**, which is innervated by the **Facial nerve (CN VII)**. ### **Why Stapedial Palsy is Correct** The acoustic reflex arc consists of: * **Afferent limb:** Cochlear nerve (CN VIII) * **Center:** Superior Olivary Complex and Facial Nerve Nucleus in the brainstem. * **Efferent limb:** Facial nerve (CN VII) to the Stapedius muscle. In **Stapedial palsy** (often seen in Bell’s palsy or lesions proximal to the nerve to stapedius), the efferent limb is broken. The muscle cannot contract, leading to a **lost reflex** and clinical **hyperacusis** (sensitivity to loud sounds). ### **Analysis of Incorrect Options** * **B. Glomus Tumour:** While a large glomus tumour can physically restrict ossicular movement, the reflex is typically "reduced" or shows an "inverted" pattern on impedance audiometry rather than being primarily lost due to nerve pathology. * **C. Internal Ear Pathology:** Sensory (cochlear) hearing loss only abolishes the reflex if the loss is severe (>60-70 dB). In mild-to-moderate cochlear loss, the reflex is often **present** at lower-than-expected intensities due to **Recruitment** (Metz Recruitment Test). * **D. Malingering:** A malingerer (someone faking hearing loss) will have a **normal, present acoustic reflex**, as the reflex is involuntary and cannot be suppressed by the patient. ### **High-Yield Clinical Pearls** * **Site of Lesion:** If the acoustic reflex is present in a patient with Facial Nerve palsy, the lesion is **distal** to the nerve to stapedius. * **Reflex Decay:** If the reflex cannot be maintained for 10 seconds, it indicates **Retrocochlear pathology** (e.g., Vestibular Schwannoma). * **Otosclerosis:** Characteristically shows an **absent reflex** due to fixation of the stapes footplate.

Q: Otoacoustic emissions arise from which structures?

Outer hair cells. **Explanation:** **Otoacoustic Emissions (OAEs)** are low-intensity sounds generated within the cochlea that can be measured in the external auditory canal. **Why Outer Hair Cells (OHCs) are correct:** The primary source of OAEs is the **Outer Hair Cells**. These cells possess a unique property called **electromotility**, mediated by the protein **prestin**. OHCs act as a "cochlear amplifier" by actively vibrating and changing length in response to sound. This mechanical energy travels backward through the middle ear ossicles to the tympanic membrane, where it is recorded as an OAE. The presence of OAEs indicates a healthy, functioning cochlear amplifier. **Why other options are incorrect:** * **Inner Hair Cells (IHCs):** These are the primary sensory receptors that convert mechanical energy into neural impulses (transduction). They do not possess motile properties and do not generate OAEs. * **Organ of Corti:** While the OHCs are *part* of the Organ of Corti, this option is too broad. The specific physiological mechanism of OAEs is localized strictly to the OHCs. **High-Yield Clinical Pearls for NEET-PG:** 1. **Screening:** OAE is the most common tool for **Universal Newborn Hearing Screening (UNHS)** because it is non-invasive, objective, and rapid. 2. **Pre-neural:** Since OAEs test OHC function, they will be **present** in cases of **Auditory Neuropathy Spectrum Disorder (ANSD)** but **absent** in sensory hearing loss (cochlear damage). 3. **Requirements:** For OAEs to be recorded, the patient must have a **normal middle ear** function. Even minor middle ear effusion can block the emission. 4. **Types:** Spontaneous (SOAEs) and Evoked (EOAEs). Clinical testing usually utilizes Transient Evoked (TEOAE) or Distortion Product (DPOAE).

Q: Rinne's test is negative in which of the following conditions?

Tympanosclerosis. ### Explanation **Rinne’s Test** is a tuning fork test (using 512 Hz) that compares Air Conduction (AC) with Bone Conduction (BC). * **Rinne Positive (Normal/SNHL):** AC > BC. * **Rinne Negative (Conductive Hearing Loss):** BC > AC. #### Why Tympanosclerosis is Correct **Tympanosclerosis** involves hyalinization and calcification of the tympanic membrane and/or middle ear structures (like the ossicles). This increases the stiffness and mass of the middle ear conducting system, resulting in **Conductive Hearing Loss (CHL)**. In CHL, bone conduction is more efficient than air conduction, leading to a **Negative Rinne's test**. #### Why Other Options are Incorrect * **Acoustic Neuroma (Vestibular Schwannoma):** This is a retrocochlear lesion causing **Sensorineural Hearing Loss (SNHL)**. In SNHL, both AC and BC are reduced, but the ratio remains AC > BC (Rinne Positive). * **Meniere’s Disease:** This is an inner ear disorder (endolymphatic hydrops) causing **SNHL**. Therefore, Rinne’s test remains Positive. * **Sensorineural Deafness:** By definition, in SNHL, the conduction mechanism is intact. While hearing is reduced, AC remains better than BC, resulting in a Rinne Positive result (often called a "False Positive" if the loss is severe). #### NEET-PG High-Yield Pearls 1. **The 15-20 dB Rule:** Rinne's test becomes negative only when the air-bone gap is at least **15–20 dB**. 2. **False Negative Rinne:** Seen in **unilateral profound SNHL**. The patient appears to have BC > AC because the sound is perceived by the opposite (better) ear via bone conduction. 3. **Tuning Fork Choice:** 512 Hz is preferred. 256 Hz provides too much vibration (tactile sense), and 1024 Hz decays too quickly. 4. **Weber Test:** In Conductive Hearing Loss (like Tympanosclerosis), the Weber test lateralizes to the **poorer** ear. In SNHL, it lateralizes to the **better** ear.

Q: Which of the following is not a cause of conductive hearing loss?

Presbycusis. **Explanation:** To answer this question, one must distinguish between **Conductive Hearing Loss (CHL)**, which results from pathology in the external or middle ear, and **Sensorineural Hearing Loss (SNHL)**, which results from lesions in the inner ear (cochlea) or the VIIIth cranial nerve. **Why Presbycusis is the Correct Answer:** **Presbycusis** is age-related hearing loss. It is a classic example of **Sensorineural Hearing Loss**. It occurs due to the progressive degeneration of the hair cells in the Organ of Corti, stria vascularis, or the spiral ganglion cells. It typically presents as bilateral, symmetrical, high-frequency hearing loss in elderly patients. **Analysis of Incorrect Options (Causes of CHL):** * **Chronic Suppurative Otitis Media (CSOM):** Involves a permanent perforation of the tympanic membrane and/or ossicular chain destruction, preventing sound from being conducted efficiently to the oval window. * **Otosclerosis:** Characterized by abnormal bone remodeling in the middle ear, most commonly leading to **stapedial fixation**. This prevents the stapes footplate from vibrating, causing CHL (often with the characteristic *Carhart’s notch* at 2 kHz). * **Serous Otitis Media (SOM):** Also known as Otitis Media with Effusion (OME). The presence of sterile fluid in the middle ear cleft dampens the vibration of the tympanic membrane and ossicles, leading to CHL. **High-Yield Clinical Pearls for NEET-PG:** * **Rinne Test:** Negative in CHL (BC > AC) and Positive in SNHL (AC > BC). * **Weber Test:** Lateralizes to the **poorer** ear in CHL and to the **better** ear in SNHL. * **Most common cause of CHL in children:** Serous Otitis Media. * **Most common cause of CHL in adults:** Otosclerosis or impacted wax.

Q: Which of the following is NOT true about otoacoustic emissions?

OAEs are auditory evoked potentials.. **Explanation:** **1. Why Option A is the Correct Answer (The Concept):** Otoacoustic Emissions (OAEs) are **not** auditory evoked potentials. Auditory evoked potentials (like BERA/ABR) measure the **electrical activity** of the auditory nerve and brainstem pathways in response to sound. In contrast, OAEs are **acoustic energy (sound)** generated by the vibration of the **Outer Hair Cells (OHCs)** of the cochlea. They represent a mechanical byproduct of the cochlear amplifier, not an electrical nerve impulse. **2. Analysis of Other Options:** * **Option B:** OAEs are indeed measured in **decibels Sound Pressure Level (dBSPL)** using a sensitive microphone placed in the external ear canal. * **Option C:** OAEs are **independent of consciousness**. They can be recorded during sleep, sedation, or even in comatose patients, as they rely on the physiological integrity of the cochlea rather than the patient's active participation or neural state. * **Option D:** OAEs are **low-intensity sounds** (usually ranging from -10 to +30 dB SPL), which is why a sealed probe and a quiet environment are necessary for accurate measurement. **Clinical Pearls for NEET-PG:** * **Site of Origin:** Outer Hair Cells (OHCs) of the Organ of Corti. * **Prerequisite:** A normal middle ear is required to conduct the sound back to the microphone. OAEs are absent in middle ear effusion. * **Clinical Use:** Primarily used for **Universal Newborn Hearing Screening (UNHS)** because it is non-invasive, objective, and fast. * **Limitation:** OAEs cannot detect **Retro-cochlear pathology** (e.g., Auditory Neuropathy Spectrum Disorder). A child with a normal OAE can still have a hearing deficit if the lesion is in the VIII nerve.

Q: A 30-year-old female presents with hearing loss. An audiogram is obtained. What is her most likely diagnosis?

Otosclerosis. ***Otosclerosis*** - The audiogram shows **conductive hearing loss** with an **air-bone gap**, indicating impaired sound transmission through the middle ear structures. - **Carhart's notch** at **2 kHz** is a characteristic finding in otosclerosis, caused by stapes fixation affecting bone conduction measurements. *Ototoxicity* - Typically causes **high-frequency sensorineural hearing loss** starting at **8 kHz and above**, not the conductive pattern seen here. - Associated with medications like **aminoglycosides** or **loop diuretics**, and shows no air-bone gap on audiometry. *Noise-induced hearing loss* - Produces a characteristic **4 kHz notch** on audiometry, representing sensorineural hearing loss at this specific frequency. - Results from prolonged exposure to **loud sounds** and does not cause conductive hearing loss or air-bone gaps. *Meniere's disease* - Causes **low-frequency sensorineural hearing loss** in early stages, progressing to involve all frequencies over time. - Associated with **episodic vertigo**, **tinnitus**, and **aural fullness**, with no conductive component on audiometry.

Question 1

Loudness recruitment phenomenon is associated with which type of hearing loss?

Accepted Answer

Cochlear hearing loss

Answer

Retrocochlear hearing loss

Answer

Conductive hearing loss

Answer

Sensorineural hearing loss

Question 2

What are the indications for a brain stem implant in a two-year-old child?

Accepted Answer

Mondini deformity

Answer

Bilateral neurofibromatosis

Answer

Absent auditory nerves

Answer

Absent cochlea

Question 3

A cochlear implant can be used in all of the following conditions causing bilateral severe to profound hearing loss, except:

Accepted Answer

Section of Cranial Nerve VIII

Answer

Meningitis

Answer

Otosclerosis

Answer

Ototoxic drugs

Question 4

In the Bing test, alternately compressing and relaxing the tragus causes the sound to increase and decrease. This finding indicates:

Accepted Answer

Sensorineural hearing loss

Answer

Adhesive otitis media

Answer

Otosclerosis

Answer

Chronic suppurative otitis media

Question 5

Acoustic reflex is lost in case of which of the following conditions?

Accepted Answer

Stapedial palsy

Answer

Glomus tumour

Answer

Internal ear pathology

Answer

Malingering

Question 6

Otoacoustic emissions arise from which structures?

Accepted Answer

Outer hair cells

Answer

Inner hair cells

Answer

Both outer and inner hair cells

Answer

Organ of Corti

Question 7

Rinne's test is negative in which of the following conditions?

Accepted Answer

Tympanosclerosis

Answer

Acoustic neuroma

Answer

Meniere's disease

Answer

Sensorineural deafness

Question 8

Which of the following is not a cause of conductive hearing loss?

Accepted Answer

Presbycusis

Answer

Chronic suppurative otitis media (CSOM)

Answer

Otosclerosis

Answer

Serous otitis media

Question 9

Which of the following is NOT true about otoacoustic emissions?

Accepted Answer

OAEs are auditory evoked potentials.

Answer

OAEs are measured in decibels (dBSPL).

Answer

OAEs can be seen during sleep.

Answer

OAEs are low intensity sounds.

Question 10

A 30-year-old female presents with hearing loss. An audiogram is obtained. What is her most likely diagnosis?

Accepted Answer

Otosclerosis

Answer

Ototoxicity

Answer

Noise-induced hearing loss

Answer

Meniere's disease

Audiology and Speech Disorders — MCQs

Audiology and Speech Disorders — MCQs

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