Otology Practice Questions

Q: What is the classification system most commonly used for facial nerve injury?

House-Brackmann grading system. ***House-Brackmann grading system*** - The **House-Brackmann scale** is the gold standard for clinically assessing the degree of **facial nerve paralysis**, ranging from Grade I (normal) to Grade VI (total paralysis). - It provides a standardized method for evaluating **facial symmetry** at rest and during voluntary movement to monitor recovery or surgical outcomes. *Seddon classification* - This is a general classification system for **peripheral nerve injuries** based on the severity of damage to the nerve components: **neuropraxia**, **axonotmesis**, and **neurotmesis**. - It describes the pathology of the nerve fiber itself rather than providing a clinical grade for **facial expression** specifically. *Sunderland classification* - An expansion of Seddon’s work, this system divides nerve injuries into **five degrees** based on the involvement of the endoneurium, perineurium, and epineurium. - While applicable to the facial nerve's histological damage, it is not the most common **clinical grading** tool used by practitioners to describe functional deficits. *Glasgow Coma Scale* - This scale is used to assess a patient's **level of consciousness** following traumatic brain injury based on eye, verbal, and motor responses. - It has no clinical application in the specific assessment of **facial nerve motor function** or cranial nerve VII palsy.

Q: A 28-year-old female presents with a history of bilateral hearing loss and tinnitus. She reports hearing better in noisy environments. Examination reveals intact ear drums bilaterally, and the Rinne test is negative bilaterally. Pure tone audiometry findings are provided below. What is the most probable diagnosis?

Stapedial otosclerosis. ***Stapedial otosclerosis*** - **Paracusis Willisii** (hearing better in noisy environments) is pathognomonic for otosclerosis, caused by **stapes fixation** preventing normal sound transmission. - **Negative Rinne test** bilaterally indicates **conductive hearing loss** with intact tympanic membranes, showing **middle ear pathology** without external canal involvement. *Meniere's Disease* - Typically presents with **sensorineural hearing loss**, **episodic vertigo**, and **aural fullness**, not the conductive pattern seen here. - **Rinne test would be positive** in Meniere's disease due to **inner ear involvement**, not middle ear pathology. *Endolymphatic fistula* - Usually follows **barotrauma** or **head injury** and presents with **sensorineural hearing loss** and **vestibular symptoms**. - Would show **positive Rinne test** as it affects the **inner ear**, not causing conductive hearing loss. *Vestibular schwannoma* - Presents with **unilateral sensorineural hearing loss**, **tinnitus**, and possible **facial nerve involvement** in advanced cases. - **Rinne test would be positive** and hearing loss is typically **unilateral**, not bilateral as described in this case.

Q: The cough response elicited while cleaning the external ear canal is mediated by stimulation of which nerve?

The X cranial nerve. This phenomenon is known as **Arnold’s Reflex** (or the Ear-Cough Reflex). It occurs due to the stimulation of the **Auricular branch of the Vagus Nerve (Arnold’s Nerve)**, which provides sensory innervation to the posterior and inferior walls of the external auditory canal (EAC). ### Why the Correct Answer is Right: When the EAC is stimulated (e.g., during syringing or cleaning with a cotton bud), sensory impulses are carried via the Vagus nerve (CN X) to the nucleus tractus solitarius in the brainstem. This triggers the efferent limb of the cough reflex, leading to an involuntary cough. This is a classic example of a referred reflex where stimulation of a peripheral nerve causes a response in a visceral organ system. ### Why Other Options are Incorrect: * **Option A (V cranial nerve):** The Auriculotemporal branch of the Mandibular nerve (V3) supplies the anterior and superior walls of the EAC. While it carries sensation, it does not mediate the cough reflex. * **Option B (C1 and C2):** The Greater Auricular nerve (C2, C3) supplies the skin over the mastoid and the lateral/lower part of the auricle, not the deep canal associated with this reflex. * **Option C (VII cranial nerve):** The Facial nerve provides minor sensory innervation to the concha and retroauricular area (often involved in Ramsay Hunt Syndrome), but it is not responsible for the cough reflex. ### High-Yield Clinical Pearls for NEET-PG: * **Arnold’s Nerve:** A branch of the Vagus (CN X). * **Vagal Reflexes in ENT:** Stimulation of the EAC can occasionally cause **bradycardia or fainting** (Vaso-vagal syncope) due to the same nerve. * **Hitchelberger’s Sign:** Reduced sensation in the area supplied by the facial nerve in the EAC, seen in Acoustic Neuroma. * **Nerve Supply of EAC (Summary):** 1. Anterior/Superior: V3 (Auriculotemporal). 2. Posterior/Inferior: X (Arnold’s). 3. Concha/Posterior wall: VII (Facial).

Q: Schwartz sign is seen in which condition?

Otosclerosis. **Explanation:** **Schwartz Sign** (also known as the Flamingo Flush sign) is a pathognomonic clinical finding in **Otosclerosis**, specifically during the active phase of the disease (Otospongiosis). * **Why it is correct:** In active otosclerosis, there is increased vascularity in the submucosa of the promontory due to rapid bone remodeling. When viewed through a translucent tympanic membrane, this hypervascularity appears as a **reddish/pinkish hue** behind the drum. It indicates that the disease is in a highly metabolic, "spongiotic" stage. * **Meniere’s Disease:** This is a disorder of the inner ear characterized by endolymphatic hydrops. The tympanic membrane appears completely normal on examination; there is no increased vascularity of the middle ear. * **ASOM:** While the tympanic membrane appears red in ASOM, it is due to acute inflammation and congestion of the drum itself (cartwheel appearance), not a localized flush on the promontory. * **CSOM:** This typically presents with a perforated tympanic membrane and discharge. While the middle ear mucosa may be polypoid or pale, it does not exhibit the specific localized vascular flush seen in Schwartz sign. **High-Yield Clinical Pearls for NEET-PG:** * **Treatment of Schwartz Sign:** If a patient presents with a positive Schwartz sign, medical management with **Sodium Fluoride** is often initiated to promote maturation of the focus (converting otospongiosis to otosclerosis) before considering surgery. * **Gelle’s Test:** Negative in otosclerosis (indicates ossicular fixation). * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz** seen on Pure Tone Audiometry. * **Bezold’s Triad:** Includes (1) Raised bone conduction threshold, (2) Negative Rinne test, and (3) Prolonged Schwabach test.

Question 1

What is the classification system most commonly used for facial nerve injury?

Accepted Answer

House-Brackmann grading system

Answer

Seddon classification

Answer

Sunderland classification

Answer

Glasgow Coma Scale

Question 2

A 28-year-old female presents with a history of bilateral hearing loss and tinnitus. She reports hearing better in noisy environments. Examination reveals intact ear drums bilaterally, and the Rinne test is negative bilaterally. Pure tone audiometry findings are provided below. What is the most probable diagnosis?

Accepted Answer

Stapedial otosclerosis

Answer

Meniere's Disease

Answer

Endolymphatic fistula

Answer

Vestibular schwannoma

Question 3

The cough response elicited while cleaning the external ear canal is mediated by stimulation of which nerve?

Accepted Answer

The X cranial nerve

Answer

The V cranial nerve

Answer

Innervation of the external ear canal by C1 and C2

Answer

Branches of the VII cranial nerve

Question 4

Schwartz sign is seen in which condition?

Accepted Answer

Otosclerosis

Answer

Meniere's disease

Answer

Acute Suppurative Otitis Media (ASOM)

Answer

Chronic Suppurative Otitis Media (CSOM)

Question 5

A child presents to the emergency department with signs of meningeal irritation, following a history of suppurative otitis media in the preceding week. Through which route can infection of the middle ear spread to the central nervous system?

Accepted Answer

Cochlear aqueduct

Answer

Venous plexus

Answer

Cochlear nerve sheath

Answer

Bloodstream

Otology — MCQs

Otology — MCQs

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