Vestibular Disorders Practice Questions

Q: Meniere's disease is characterized by which of the following pathophysiological changes?

Endolymphatic hydrops. **Explanation:** **Meniere’s Disease (Endolymphatic Hydrops)** is a disorder of the inner ear characterized by an abnormal accumulation of endolymph within the membranous labyrinth. 1. **Why Option B is Correct:** The core pathophysiology involves either the **overproduction** or **under-absorption** of endolymph (specifically at the endolymphatic sac). This leads to increased hydrostatic pressure, causing distension of the membranous labyrinth—a state known as **Endolymphatic Hydrops**. This pressure causes periodic ruptures in Reissner’s membrane, allowing potassium-rich endolymph to mix with perilymph, resulting in the characteristic episodic vertigo and hearing loss. 2. **Why Other Options are Incorrect:** * **A. Perilymphatic hydrops:** This is not a recognized clinical entity in this context. Meniere’s specifically affects the endolymphatic compartment. * **C. Otospongiosis:** This refers to the early vascular stage of **Otosclerosis**, where mature lamellar bone is replaced by woven spongy bone, typically causing conductive hearing loss. * **D. Coalescent mastoiditis:** This is a complication of Acute Otitis Media (AOM) involving the destruction of bony septa between mastoid air cells. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Episodic vertigo, fluctuating sensorineural hearing loss (SNHL), and tinnitus (often described as "roaring"). * **Audiometry:** Characteristically shows **low-frequency SNHL** in early stages (Rising curve). * **Lermoyez Syndrome:** A variant where hearing improves during a vertigo attack. * **Glycerol Test:** Used for diagnosis; glycerol acts as an osmotic diuretic, temporarily reducing hydrops and improving hearing. * **Management:** Medical (Salt restriction, Betahistine, Diuretics) or Surgical (Endolymphatic sac decompression for refractory cases).

Q: A false positive fistula test is associated with which of the following conditions?

Congenital syphilis. **Explanation:** The **Fistula Test** is used to identify an abnormal communication (fistula) between the inner and middle ear. A positive result occurs when pressure changes in the external auditory canal (via a Siegle’s speculum) induce nystagmus and vertigo. **1. Why Congenital Syphilis is correct:** In **Congenital Syphilis**, a "False Positive" fistula test occurs, also known as **Hennebert’s Sign**. It is considered "false" because there is no actual bony fistula present. Instead, the nystagmus is caused by: * **Fibrous adhesions** between the stapes footplate and the membranous labyrinth. * An abnormally **hypermobile stapes** footplate. Pressure is transmitted directly to the saccule, triggering the vestibular response despite an intact bony labyrinth. **2. Analysis of Incorrect Options:** * **Perilymph Fistula:** This is a **True Positive**. There is an actual breach in the oval or round window membrane, allowing pressure to affect the perilymph. * **Cholesteatoma:** This is the most common cause of a **True Positive** fistula test, typically due to erosion of the **Horizontal Semicircular Canal**. * **Malignant Sclerosis:** This is not a standard clinical term related to fistula testing. (Otosclerosis, however, usually results in a negative test unless complicated by other factors). **3. NEET-PG High-Yield Pearls:** * **Hennebert’s Sign:** Specifically refers to the false-positive fistula test in Congenital Syphilis or Meniere’s disease (due to fibrosis). * **Tullio Phenomenon:** Vertigo/nystagmus induced by **loud sounds**. Seen in Congenital Syphilis, Meniere’s, and Superior Semicircular Canal Dehiscence (SSCD). * **False Negative Test:** Occurs if the fistula is plugged by cholesteatoma/granulations or if the labyrinth is "dead" (non-functional).

Q: Common presenting manifestations of Meniere's disease are all except?

Loss of consciousness. **Explanation:** Meniere’s disease (Endolymphatic Hydrops) is a disorder of the inner ear characterized by an increase in the volume of endolymph. The classic presentation involves a specific **diagnostic triad** of symptoms. **Why "Loss of Consciousness" is the correct answer:** Meniere’s disease affects the peripheral vestibular system and the cochlea. While the vertigo can be severe enough to cause a "drop attack" (Tumarkin’s otolithic crisis) where the patient falls suddenly without warning, **consciousness is always preserved.** Loss of consciousness (syncope) suggests a central nervous system pathology or a cardiovascular issue, rather than a peripheral inner ear disorder. **Analysis of other options:** * **Vertigo (Option B):** Episodic, true objective vertigo is a hallmark. Attacks typically last 20 minutes to several hours and are often accompanied by nausea and vomiting. * **Sensorineural Deafness (Option C):** Characteristically **fluctuating** and **low-frequency** SNHL. In early stages, hearing returns to normal between attacks, but eventually becomes permanent. * **Tinnitus (Option A):** Usually low-pitched and described as "roaring" or "seashell" sound. It often worsens during acute attacks. **High-Yield Clinical Pearls for NEET-PG:** * **Pathology:** Distension of the endolymphatic system (Endolymphatic Hydrops), most commonly affecting the **scala media** and saccule. * **Audiometry:** Shows low-frequency SNHL; **Recruitment phenomenon** is positive (indicates cochlear pathology). * **Glycerol Test:** Used for diagnosis; oral glycerol (osmotic diuretic) temporarily improves hearing by reducing endolymphatic pressure. * **Management:** Low salt diet, diuretics (Acetazolamide), and Betahistine for maintenance; Intratympanic Gentamicin or Labyrinthectomy for refractory cases.

Q: Positional vertigo is most commonly seen due to pathology in which of the following structures?

Posterior semicircular canal. ### Explanation **Correct Answer: D. Posterior semicircular canal** **Why it is correct:** Positional vertigo is most frequently caused by **Benign Paroxysmal Positional Vertigo (BPPV)**. The underlying pathophysiology involves **canalithiasis**, where calcium carbonate crystals (otoconia) displace from the utricle into the semicircular canals. The **posterior semicircular canal** is the most common site (involved in 85–95% of cases) because it is the most gravity-dependent part of the vestibular system when a person is upright or supine, making it a natural "sink" for displaced otoconia. **Analysis of Incorrect Options:** * **A. Lateral (Horizontal) semicircular canal:** This is the second most common site (5–15%). It presents with horizontal nystagmus during the Supine Roll Test. * **B. Superior (Anterior) semicircular canal:** This is very rare (<1%) because its anatomical position (the highest point of the vestibular apparatus) prevents debris from entering or staying within it easily. * **C. Inferior semicircular canal:** This is an anatomical misnomer in this context; the posterior canal is sometimes referred to as the inferior canal in general anatomy, but in clinical Neurotology, "Posterior Canal" is the standard terminology. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** The **Dix-Hallpike Maneuver** is used to diagnose Posterior Canal BPPV. It typically elicits geotropic, torsional, up-beating nystagmus with a brief latency. * **Treatment of Choice:** The **Epley Maneuver** (Canalith Repositioning Procedure) is the definitive treatment for posterior canal involvement. * **Key Feature:** BPPV is characterized by brief episodes of vertigo (usually <1 minute) triggered by head movements, with no associated hearing loss or tinnitus.

Q: Which of the following is not a typical feature of Meniere's disease?

Pulsatile tinnitus. **Explanation:** Meniere’s Disease (Endolymphatic Hydrops) is characterized by an increase in the volume and pressure of the endolymph within the inner ear. The classic clinical tetrad includes episodic vertigo, fluctuating sensorineural hearing loss, tinnitus, and a sensation of aural fullness. **Why Pulsatile Tinnitus is the correct answer:** In Meniere’s disease, the tinnitus is typically described as **low-pitched and non-pulsatile** (often compared to a "roaring" or "hissing" sound). **Pulsatile tinnitus** is a rhythmic sound synchronous with the heartbeat, usually indicating a vascular etiology such as a **Glomus tumor** (Paraganglioma), carotid artery stenosis, or benign intracranial hypertension. It is not a feature of endolymphatic hydrops. **Analysis of Incorrect Options:** * **Sensorineural Deafness (SND):** This is a hallmark of the disease. It is caused by the distension of the cochlear duct damaging the hair cells. * **Fluctuating Deafness:** In the early stages, hearing loss is characteristically fluctuating. It typically affects low frequencies first (rising curve on audiometry) before becoming permanent and involving all frequencies. * **Vertigo:** Patients experience sudden, episodic, and disabling true vertigo, often accompanied by nausea and vomiting, lasting minutes to hours. **NEET-PG High-Yield Pearls:** 1. **Lermoyez Syndrome:** A variant of Meniere’s where hearing improves during a vertigo attack ("the phenomenon of reverse symptoms"). 2. **Tullio Phenomenon:** Vertigo induced by loud sounds (seen in Meniere’s and Superior Semicircular Canal Dehiscence). 3. **Glycerol Test:** Used for diagnosis; glycerol acts as an osmotic diuretic to temporarily reduce endolymphatic pressure, improving hearing thresholds. 4. **Burnout Phenomenon:** Late-stage Meniere’s where vertigo ceases but hearing loss and imbalance become permanent.

Question 1

Meniere's disease is characterized by which of the following pathophysiological changes?

Accepted Answer

Endolymphatic hydrops

Answer

Perilymphatic hydrops

Answer

Otospongiosis

Answer

Coalescent mastoiditis

Question 2

A false positive fistula test is associated with which of the following conditions?

Accepted Answer

Congenital syphilis

Answer

Perilymph fistula

Answer

Malignant sclerosis

Answer

Cholesteatoma

Question 3

Common presenting manifestations of Meniere's disease are all except?

Accepted Answer

Loss of consciousness

Answer

Tinnitus

Answer

Vertigo

Answer

Sensorineural deafness

Question 4

Positional vertigo is most commonly seen due to pathology in which of the following structures?

Accepted Answer

Posterior semicircular canal

Answer

Lateral semicircular canal

Answer

Superior semicircular canal

Answer

Inferior semicircular canal

Question 5

Which of the following is not a typical feature of Meniere's disease?

Accepted Answer

Pulsatile tinnitus

Answer

Sensorineural deafness

Answer

Vertigo

Answer

Fluctuating deafness

Vestibular Disorders — MCQs

Vestibular Disorders — MCQs

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