Audiology and Speech Disorders Practice Questions

Q: All of the following structures are involved in conductive deafness except?

8th nerve. **Explanation:** Hearing loss is broadly classified into two types based on the site of the lesion: **Conductive Hearing Loss (CHL)** and **Sensorineural Hearing Loss (SNHL).** **1. Why the 8th Nerve is the Correct Answer:** The 8th cranial nerve (Vestibulocochlear nerve) is responsible for transmitting electrical impulses from the cochlea to the brainstem. Any pathology involving the 8th nerve or the cochlea results in **Sensorineural Hearing Loss**, not conductive deafness. Therefore, it is the "except" in this list. **2. Analysis of Incorrect Options (Causes of Conductive Deafness):** Conductive deafness occurs when there is an obstruction or defect in the mechanism that conducts sound waves to the inner ear. * **Auricle (Option A):** Congenital conditions like anotia or microtia can prevent sound from being collected and directed into the ear canal. * **External Auditory Meatus (Option D):** Obstructions here, such as impacted wax, foreign bodies, otitis externa, or atresia, block sound conduction. * **Middle Ear (Option C):** This is the most common site for CHL. Conditions include Otitis Media with Effusion (OME), Otosclerosis (stapes fixation), ossicular discontinuity, or tympanic membrane perforation. **High-Yield Clinical Pearls for NEET-PG:** * **Rinne Test:** In CHL, Rinne is **Negative** (Bone Conduction > Air Conduction). In SNHL, Rinne is **Positive** (AC > BC). * **Weber Test:** Lateralizes to the **poorer ear** in CHL and to the **better ear** in SNHL. * **Carhart’s Notch:** A characteristic dip at 2000 Hz in bone conduction seen in **Otosclerosis** (a conductive pathology). * **Most common cause of CHL in children:** Otitis Media with Effusion (Glue Ear).

Q: In the Bing test, upon alternately compressing and releasing the external acoustic meatus, if the sound increases, what does this indicate?

Sensorineural deafness. ### 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 Deafness is Correct The occlusion effect occurs when the external ear canal is closed, causing sound heard via bone conduction to become louder. This happens because occlusion prevents the escape of low-frequency sound waves from the canal, reflecting them back to the tympanic membrane. * **Positive Bing Test:** In a normal individual or someone with **Sensorineural deafness**, the patient perceives the sound getting louder (pulsating) when the meatus is compressed and softer when released. This indicates that the middle ear conducting mechanism is functional. #### 2. Why the Other Options are Incorrect * **Otosclerosis, Adhesive Otitis Media, and CSOM:** These are all causes of **Conductive Hearing Loss (CHL)**. * **Negative Bing Test:** In CHL, the occlusion effect is already "built-in" because the pathology (e.g., stapedial fixation or fluid) prevents sound from escaping the ear. Therefore, manually compressing the tragus produces **no change** in the intensity of the sound. #### 3. Clinical Pearls for NEET-PG * **Bing Test vs. Gelle’s Test:** While Bing uses simple occlusion, **Gelle’s test** uses a Siegle’s speculum to increase air pressure in the canal. A "Negative Gelle’s" (no change in sound) is a classic finding in **Otosclerosis**. * **The "ABC" of Bone Conduction:** * **A**bsolute Bone Conduction (ABC) Test: Compares patient to examiner (with meatus occluded). * **B**ing Test: Uses the occlusion effect. * **C**onductive loss = Negative Bing (No change). * **High-Yield Rule:** Any test based on the occlusion effect (Bing, ABC, Schwabach) will show no change or "prolonged" results in conductive hearing loss because the ear is effectively already occluded by the disease process.

Q: A patient presents with unilateral sensorineural hearing loss and the MRI findings are as shown. What is the most probable diagnosis?

Acoustic neuroma. ***Acoustic neuroma*** - **Unilateral sensorineural hearing loss** is the classic presenting feature of acoustic neuroma (vestibular schwannoma), arising from the **8th cranial nerve**. - MRI typically shows **contrast enhancement** in the **cerebellopontine angle (CPA)** and **internal auditory canal (IAC)** with the characteristic **ice-cream cone** or **trumpet sign**. *Astrocytoma* - Primarily occurs within the **brain parenchyma** rather than the cerebellopontine angle or internal auditory canal. - Usually presents with **increased intracranial pressure**, **seizures**, or **focal neurological deficits**, not isolated hearing loss. *Glioma* - Represents **intraparenchymal brain tumors** that typically arise from **glial cells** within the brain tissue. - Clinical presentation involves **headaches**, **seizures**, and **progressive neurological deficits**, rarely causing isolated unilateral hearing loss. *Secondaries in the brain* - Brain **metastases** typically appear as **multiple lesions** with significant **surrounding edema** on MRI. - Usually associated with a **known primary malignancy** and systemic symptoms, not isolated cranial nerve dysfunction.

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 frequency is primarily affected in noise-induced hearing loss?

4000 Hz. **Explanation:** Noise-induced hearing loss (NIHL) is a sensorineural hearing loss resulting from exposure to high-intensity sound. The characteristic finding in NIHL is a localized dip in the audiogram, known as the **"Acoustic Notch."** **Why 4000 Hz is correct:** The notch typically occurs at **4000 Hz** (Boies' Notch). This specific vulnerability is attributed to the anatomical resonance of the external auditory canal, which peaks between 2000–3000 Hz. Due to the "half-octave shift" phenomenon, the maximum acoustic energy is delivered to the organ of Corti at a point slightly higher than the resonance frequency, specifically targeting the hair cells responsible for the 4000 Hz range. **Analysis of Incorrect Options:** * **1000 Hz & 2000 Hz:** These are mid-frequencies essential for speech perception. While they can be affected in advanced, chronic noise exposure, they are never the primary or initial site of injury. * **3000 Hz:** While the notch can sometimes begin at 3000 Hz or extend to 6000 Hz, 4000 Hz remains the most classic and frequently tested "peak" of the deficit in medical examinations. **High-Yield Clinical Pearls for NEET-PG:** * **Symmetry:** NIHL is almost always **bilateral and symmetrical**. Unilateral loss should prompt a search for other etiologies (e.g., acoustic neuroma). * **Recovery:** In early stages (Temporary Threshold Shift), hearing returns to normal within 24 hours. Permanent Threshold Shift (PTS) occurs with chronic exposure. * **Presbycusis vs. NIHL:** Unlike NIHL (which notches at 4000 Hz), presbycusis (age-related loss) shows a progressive **down-sloping** curve affecting all high frequencies without a notch. * **Management:** It is irreversible; hence, prevention with earplugs or muffs is the gold standard.

Q: Cochlear implants are used for which of the following conditions?

Moderate and severe hearing loss. **Explanation:** **1. Why Option C is Correct:** A cochlear implant (CI) is a surgically implanted electronic device that bypasses damaged hair cells in the cochlea to provide direct electrical stimulation to the auditory nerve. The primary indication for a CI is **severe to profound sensorineural hearing loss (SNHL)** in patients who derive little to no benefit from conventional hearing aids. While the option mentions "moderate and severe," in clinical practice, it is specifically indicated for those with severe-to-profound loss where speech discrimination is significantly impaired. **2. Why Other Options are Incorrect:** * **A & D (Refractory Vertigo and Loss of Balance):** These are vestibular symptoms. While the cochlea and vestibule are both in the inner ear, a CI is designed for sound transduction, not for stabilizing the vestibular system. Treatments for refractory vertigo include intratympanic gentamicin or vestibular nerve section. * **B (Severe Tinnitus):** While some patients report an improvement in tinnitus after receiving a CI for hearing loss, tinnitus alone is not a primary indication for the procedure. **3. High-Yield Clinical Pearls for NEET-PG:** * **Components:** It consists of an external part (microphone, speech processor, transmitter) and an internal part (receiver-stimulator and electrode array). * **Site of Placement:** The electrode array is typically inserted into the **Scala Tympani** via the round window. * **Prerequisite:** A functioning **Auditory Nerve (CN VIII)** is mandatory. If the nerve is absent (e.g., in Auditory Nerve Aplasia), an **Auditory Brainstem Implant (ABI)** is indicated instead. * **Ideal Age:** For congenital deafness, the best results are achieved when implanted early (ideally <12–18 months) due to neural plasticity.

Q: Intensity of sound is measured in:

Decibels. **Explanation:** The correct answer is **Decibels (dB)**. In audiology, the **intensity** (or loudness) of sound is measured in decibels. The decibel is a logarithmic unit that expresses the ratio of a physical sound intensity to a specified reference level (usually the threshold of human hearing, 0 dB SPL). Because the human ear can perceive a vast range of intensities, a logarithmic scale is used to make these values manageable. In clinical practice, we use **dB HL (Hearing Level)** on audiograms to represent hearing loss relative to the average normal hearing threshold. **Analysis of Incorrect Options:** * **Diopters (A):** This is the unit of measurement for the refractive power of a lens (Ophthalmology). * **Daltons (B):** Also known as the unified atomic mass unit, it is used to express atomic and molecular masses (Biochemistry). * **Pounds (D):** A unit of mass or force in the imperial system, unrelated to acoustics. **High-Yield Clinical Pearls for NEET-PG:** * **Frequency vs. Intensity:** While intensity is measured in **Decibels (dB)**, the pitch or frequency of sound is measured in **Hertz (Hz)**. * **Reference Levels:** * **dB SPL (Sound Pressure Level):** Used for physical sound measurements. * **dB HL (Hearing Level):** Used in clinical audiometry (0 dB HL is the normalized average). * **dB SL (Sensation Level):** The number of decibels above an individual's specific hearing threshold. * **Inverse Square Law:** Sound intensity decreases inversely with the square of the distance from the source. * **Logarithmic Rule:** Every increase of 3 dB represents a doubling of sound energy, while an increase of 10 dB represents a tenfold increase.

Question 1

All of the following structures are involved in conductive deafness except?

Accepted Answer

8th nerve

Answer

Auricle

Answer

Middle ear

Answer

External auditory meatus

Question 2

In the Bing test, upon alternately compressing and releasing the external acoustic meatus, if the sound increases, what does this indicate?

Accepted Answer

Sensorineural deafness

Answer

Otosclerosis

Answer

Adhesive otitis media

Answer

Chronic suppurative otitis media

Question 3

A patient presents with unilateral sensorineural hearing loss and the MRI findings are as shown. What is the most probable diagnosis?

Accepted Answer

Acoustic neuroma

Answer

Astrocytoma

Answer

Glioma

Answer

Secondaries in the brain

Question 4

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 5

Which frequency is primarily affected in noise-induced hearing loss?

Accepted Answer

4000 Hz

Answer

1000 Hz

Answer

2000 Hz

Answer

3000 Hz

Question 6

Which of the following conditions will result in the maximum conductive hearing loss?

Accepted Answer

Intact tympanic membrane with ossicular discontinuity

Answer

Partial stapes fixation

Answer

Tympanic membrane perforation with an intact ossicular chain

Answer

Tympanic membrane perforation with ossicular discontinuity

Question 7

Cochlear implants are used for which of the following conditions?

Accepted Answer

Moderate and severe hearing loss

Answer

Refractory vertigo

Answer

Severe tinnitus

Answer

Loss of balance

Question 8

The Bing test is used to assess which of the following?

Accepted Answer

Bone conduction test

Answer

Audiometric test

Answer

Air conduction test

Answer

Special test

Question 9

Otoacoustic emissions arise from?

Accepted Answer

Outer hair cells

Answer

Inner hair cells

Answer

Both

Answer

Organ of Corti

Question 10

Intensity of sound is measured in:

Accepted Answer

Decibels

Answer

Diopters

Answer

Daltons

Answer

Pounds

Audiology and Speech Disorders — MCQs

Audiology and Speech Disorders — MCQs

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