Otology Practice Questions

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.

Q: At what atmospheric pressure gradient does barotraumatic otitis media occur?

90 mm of Hg. **Explanation:** **Barotraumatic Otitis Media** (also known as Otitic Barotrauma) occurs due to a failure of the Eustachian tube to equalize a rapid increase in ambient atmospheric pressure, most commonly during the descent of an aircraft or deep-sea diving. 1. **Why 90 mm Hg is correct:** Under normal conditions, the Eustachian tube opens periodically to equalize middle ear pressure. However, when the external atmospheric pressure exceeds the middle ear pressure by a gradient of **90 mm Hg**, the fibrocartilaginous portion of the Eustachian tube becomes forcefully "locked" or collapsed. At this critical pressure gradient, the tensor veli palatini muscle is no longer strong enough to open the tube, leading to severe negative pressure in the middle ear, mucosal edema, and potential hemorrhage or effusion. 2. **Analysis of Incorrect Options:** * **80 mm Hg:** While physiological stress begins at lower gradients, the "locking" phenomenon that defines clinical barotrauma typically occurs at the 90 mm Hg threshold. * **100 mm Hg & 120 mm Hg:** These pressures are well beyond the initial locking point. By the time the gradient reaches these levels, significant pathological changes (like tympanic membrane rupture or hemotympanum) are likely already occurring. **NEET-PG High-Yield Pearls:** * **The "Locking" Phenomenon:** Occurs at a pressure differential of **90 mm Hg**. * **Most Common Cause:** Rapid descent in an airplane (negative middle ear pressure). * **Clinical Presentation:** Severe ear pain (otalgia), hearing loss, and a retracted/congested tympanic membrane (Teed Scale is used for grading). * **Prevention:** Valsalva maneuver during descent, chewing gum, or using decongestants. * **Treatment:** Most cases are managed conservatively; however, if the tube remains locked, myringotomy may be required to equalize pressure.

Q: Which of the following is associated with objective tinnitus?

Glomus tumor. **Explanation:** Tinnitus is classified into two types: **Subjective** (heard only by the patient) and **Objective** (audible to both the patient and the examiner). **Why Glomus Tumor is the Correct Answer:** A Glomus tumor (Paraganglioma) is a highly vascular neoplasm. Because of its extreme vascularity and proximity to the middle ear structures, it produces **pulsatile objective tinnitus**. The sound corresponds to the patient’s heartbeat and can often be heard by an examiner using a stethoscope or a Toynbee tube placed over the external auditory canal. This is a classic "vascular" cause of tinnitus. **Analysis of Incorrect Options:** * **Meniere’s Disease:** Characterized by low-pitched, roaring **subjective** tinnitus, usually accompanied by vertigo and sensorineural hearing loss. * **Acoustic Neuroma:** Typically presents with high-pitched, continuous **subjective** tinnitus due to compression of the cochlear nerve. * **Ear Wax (Cerumen):** Causes **subjective** tinnitus due to conductive interference or the physical sensation of the wax touching the tympanic membrane. **High-Yield Clinical Pearls for NEET-PG:** * **Pulsatile Tinnitus:** Always think of vascular etiologies like Glomus tumors, carotid artery stenosis, or benign intracranial hypertension. * **Brown’s Sign:** Pulsation of the tumor mass seen on otoscopy in Glomus jugulare/tympanicum, which blanches on positive pressure with a Siegle’s bulb. * **Aquino’s Sign:** Blanching of the tympanic mass upon carotid artery compression (specific to Glomus tumors). * **Objective Tinnitus (Non-vascular):** Can also be caused by palatal myoclonus or patulous Eustachian tube (clicking/rushing sounds).

Question 1

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 2

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 3

At what atmospheric pressure gradient does barotraumatic otitis media occur?

Accepted Answer

90 mm of Hg

Answer

80 mm of Hg

Answer

100 mm of Hg

Answer

120 mm of Hg

Question 4

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

Question 5

Which of the following is associated with objective tinnitus?

Accepted Answer

Glomus tumor

Answer

Meiners disease

Answer

Acoustic neuroma

Answer

Ear wax

Otology — MCQs

Otology — MCQs

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