Vestibular Disorders — MCQs

A 57-year-old banker complains of 2 days of severe dizziness. When she sits up or rolls over in bed, she has a spinning sensation that lasts for a few seconds and is followed by nausea. These episodes have occurred many times a day and prevent her from working. She denies fever or upper respiratory symptoms and takes no medications. When moved quickly from a sitting to a lying position with her head turned and hanging below the horizontal plane, she complains of dizziness, and horizontal nystagmus is noted. What is the most likely diagnosis?

Q28Medium

Which of the following is NOT true about benign paroxysmal positional vertigo?

Q29Medium

The site of lesion in unilateral past pointing nystagmus is?

Q30Easy

What components does the caloric test have?

Vestibular Disorders Indian Medical PG Practice Questions and MCQs

Question 21: Which of the following is NOT a feature of Meniere's disease?

A. Vertigo
B. Aural fullness or pressure in the ear
C. Diplopia (Correct Answer)
D. Tinnitus

Explanation: **Explanation:** **Meniere’s Disease (Endolymphatic Hydrops)** is a disorder of the inner ear characterized by an increase in the volume and pressure of the endolymph. The correct answer is **Diplopia** because it is a neurological symptom (double vision) indicating brainstem or cranial nerve involvement, which is not a feature of this peripheral vestibular disorder. **Why the other options are incorrect (Features of Meniere's):** Meniere’s disease is classically defined by a **triad** (or tetrad) of symptoms: * **Vertigo (Option A):** Episodic, true objective vertigo lasting 20 minutes to several hours, often accompanied by nausea and vomiting. * **Aural Fullness (Option B):** A sensation of pressure or "clogged" ear, often preceding an attack. * **Tinnitus (Option D):** Typically low-pitched and "roaring" in nature, which may fluctuate in intensity. * **Sensorineural Hearing Loss (SNHL):** Characteristically low-frequency and fluctuating in the early stages. **High-Yield Clinical Pearls for NEET-PG:** 1. **Pathology:** Distension of the membranous labyrinth due to failure of endolymph resorption in the endolymphatic sac. 2. **Audiometry:** Shows **low-frequency SNHL**. In early stages, the graph is "rising"; in late stages, it becomes "flat." 3. **Recruitment Phenomenon:** Present (indicates a cochlear lesion). 4. **Glycerol Test:** Used for diagnosis; oral glycerol (osmotic diuretic) temporarily improves hearing by reducing endolymphatic pressure. 5. **Management:** * *Acute:* Vestibular suppressants (Prochlorperazine). * *Maintenance:* Low-salt diet, Betahistine (drug of choice), and diuretics. * *Surgical:* Endolymphatic sac decompression (conservative) or Labyrinthectomy (destructive).

Question 22: What is the treatment for Benign Positional Vertigo?

A. Vestibular exercises (Correct Answer)
B. Vestibular sedatives
C. Antihistamines
D. Diuretics

Explanation: **Explanation:** **Benign Paroxysmal Positional Vertigo (BPPV)** is caused by the displacement of calcium carbonate crystals (otoconia) from the utricle into the semicircular canals (most commonly the posterior canal). **Why Option A is Correct:** The definitive treatment for BPPV is mechanical repositioning of these otoconia. **Vestibular exercises** and **Canalith Repositioning Maneuvers (CRMs)**, such as the **Epley maneuver** (for posterior canal) or **Semont maneuver**, are designed to move the debris out of the canal and back into the vestibule. For long-term habituation and balance retraining, **Brandt-Daroff exercises** are often prescribed. These physical interventions address the underlying mechanical cause, unlike pharmacological agents. **Why Other Options are Incorrect:** * **B & C (Vestibular sedatives/Antihistamines):** Drugs like Prochlorperazine, Cinnarizine, or Betahistine only suppress the symptoms (nausea/dizziness) but do not cure the condition. They may actually delay central compensation and are generally avoided in BPPV unless the patient is experiencing severe vomiting. * **D (Diuretics):** These are used in the management of **Meniere’s disease** to reduce endolymphatic hydrops, but they have no role in treating the mechanical displacement seen in BPPV. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** The **Dix-Hallpike Maneuver** (look for geotropic nystagmus with a latent period and fatigability). * **Most Common Canal:** Posterior Semicircular Canal. * **Epley Maneuver:** The treatment of choice for posterior canal BPPV. * **Key Differentiator:** BPPV presents with brief episodes of vertigo (seconds) triggered by head movement, with no hearing loss or tinnitus.

Question 23: All of the following assess vestibular function, except?

A. Fistula test
B. Galvanic test
C. Lombard test (Correct Answer)
D. VEMP

Explanation: **Explanation:** The **Lombard test** is a test of **hearing (auditory function)**, not vestibular function. It is based on the "Lombard effect," where a person involuntarily increases the intensity of their voice when subjected to loud background noise. In clinical practice, it is used to detect **malingering** (pseudohypacusis). If a patient claims to have bilateral hearing loss but raises their voice when noise is introduced into their ears, it proves they can hear the noise. **Analysis of other options:** * **Fistula test:** Assesses the integrity of the bony labyrinth. A positive test (nystagmus/vertigo upon applying pressure to the EAC) indicates a **labyrinthine fistula**, commonly seen in cholesteatoma. * **Galvanic test:** Evaluates the **vestibular nerve** and central pathways. Unlike caloric tests (which only test the horizontal canal), the galvanic test bypasses the end organ to stimulate the nerve directly. * **VEMP (Vestibular Evoked Myogenic Potentials):** A modern electrophysiological test. **cVEMP** (cervical) assesses the **saccule** and inferior vestibular nerve, while **oVEMP** (ocular) assesses the **utricle** and superior vestibular nerve. **High-Yield Clinical Pearls for NEET-PG:** * **Caloric Test (COWS):** The most common test for the lateral semicircular canal. (Cold Opposite, Warm Same side nystagmus). * **Hennebert’s Sign:** A false positive fistula test (nystagmus without a fistula) seen in **Meniere’s disease** or **Congenital Syphilis** due to fibrous bands. * **Stenger’s Test:** Another high-yield test for **unilateral** malingering.

Question 24: Epley's maneuver is used for the management of which condition?

A. Benign paroxysmal positional vertigo (Correct Answer)
B. Basilar migraine
C. Orthostatic hypotension
D. Thoracic outlet syndrome

Explanation: **Explanation:** **Correct Answer: A. Benign Paroxysmal Positional Vertigo (BPPV)** Epley’s maneuver is the gold-standard treatment for **Posterior Canal BPPV**, the most common form of the disorder. The underlying pathophysiology involves **canalithiasis**, where calcium carbonate crystals (otoconia) from the utricle become displaced into the semicircular canals. Epley’s maneuver is a **canalith repositioning procedure** that uses gravity through a series of head movements to shift these free-floating particles out of the posterior canal and back into the utricle, thereby resolving the vertigo. **Incorrect Options:** * **B. Basilar Migraine:** This is a central cause of vertigo associated with migraine symptoms (aura, headache). Management involves lifestyle modifications and prophylactic medications (e.g., Beta-blockers, Flunarizine), not physical maneuvers. * **C. Orthostatic Hypotension:** This causes "lightheadedness" or syncope upon standing due to a drop in blood pressure. It is managed by fluid resuscitation, compression stockings, or medications like Midodrine. * **D. Thoracic Outlet Syndrome:** This is a neurovascular compression syndrome affecting the upper limb. It presents with pain, numbness, or weakness in the arm, not true rotational vertigo. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** BPPV is diagnosed using the **Dix-Hallpike Maneuver** (look for geotropic rotatory nystagmus). * **Treatment:** Epley’s is for Posterior canal; **Semont’s maneuver** is an alternative. For **Horizontal canal BPPV**, the **Lempert (Roll) maneuver** or Gufoni maneuver is used. * **Hallmark:** Brief episodes of vertigo (<1 minute) triggered by specific head movements (e.g., rolling in bed). No hearing loss or tinnitus is present.

Question 25: Which of the following conditions is diagnosed by the Hallpike maneuver?

A. Benign Paroxysmal Positional Vertigo (BPPV) (Correct Answer)
B. Sensorineural hearing loss
C. Conductive hearing loss
D. Otosclerosis

Explanation: **Explanation:** The **Dix-Hallpike maneuver** is the gold standard diagnostic test for **Benign Paroxysmal Positional Vertigo (BPPV)**, specifically involving the posterior semicircular canal. The underlying pathophysiology of BPPV involves **canalithiasis** (displaced otoconia from the utricle entering the semicircular canals). When the patient’s head is moved into the provocative position, these particles shift, causing endolymph movement and stimulating the cupula. This results in a characteristic **paroxysmal, geotropic, rotatory nystagmus** and vertigo after a short latency period. **Why the other options are incorrect:** * **Sensorineural hearing loss (SNHL):** This is a deficit in the inner ear or vestibulocochlear nerve, diagnosed via **Pure Tone Audiometry (PTA)** and Rinne/Weber tuning fork tests. * **Conductive hearing loss (CHL):** This involves pathology in the external or middle ear (e.g., wax, CSOM). It is diagnosed via clinical examination and tuning fork tests (Rinne negative). * **Otosclerosis:** A specific cause of CHL due to stapes fixation. It is diagnosed by a "Carhart’s notch" at 2000 Hz on PTA and an **absent stapedial reflex** (Tympanometry). **High-Yield Clinical Pearls for NEET-PG:** * **Treatment of Choice:** While Dix-Hallpike is for diagnosis, the **Epley maneuver** (canalith repositioning) is the treatment of choice for posterior canal BPPV. * **Nystagmus Characteristics:** In BPPV, the nystagmus is **fatigable** (decreases with repeat testing) and has a **latency** of 5–20 seconds. * **Supine Roll Test:** Used if horizontal canal BPPV is suspected instead of the posterior canal.

Question 26: The caloric test, which is based on thermal stimulation, primarily stimulates which part of the semicircular canals?

A. Posterior canal
B. Anterior canal
C. Lateral canal (Correct Answer)
D. All semicircular canals

Explanation: **Explanation:** The **Caloric Test** (part of the Fitzgerald-Hallpike test) is a clinical assessment of the vestibulo-ocular reflex. It relies on the principle of **convection currents** induced by thermal stimulation (water or air) in the external auditory canal. **Why the Lateral Canal?** The lateral (horizontal) semicircular canal is the most superficial canal, lying in close proximity to the medial wall of the middle ear. During the test, the patient is positioned supine with the head tilted **30° forward**. This orientation places the lateral canal in a **vertical plane**. When cold or warm irrigation is applied, a temperature gradient is created across the canal, causing the endolymph to change density and move. This movement stimulates the hair cells in the crista ampullaris of the lateral canal specifically, triggering nystagmus. **Analysis of Incorrect Options:** * **A & B (Posterior and Anterior Canals):** These are the vertical canals. Due to their anatomical depth and orientation (even with head positioning), they are not significantly affected by the thermal gradient produced in the external ear canal. * **D (All Canals):** While theoretically, some heat might reach other structures, the caloric test is clinically validated and physiologically designed to isolate and test the **lateral canal** and its associated superior vestibular nerve. **High-Yield Clinical Pearls for NEET-PG:** * **COWS Mnemonic:** **C**old **O**pposite, **W**arm **S**ame (refers to the direction of the fast phase of nystagmus). * **Positioning:** Patient must be supine with the head at 30° to make the lateral canal vertical. * **Indication:** It is the gold standard for diagnosing **Unilateral Vestibular Hypofunction** (e.g., Canal Paresis in Meniere’s or Vestibular Neuronitis). * **Dead Labyrinth:** If no nystagmus occurs with both hot and cold stimulation, it indicates a non-functioning labyrinth.

Question 27: A 57-year-old banker complains of 2 days of severe dizziness. When she sits up or rolls over in bed, she has a spinning sensation that lasts for a few seconds and is followed by nausea. These episodes have occurred many times a day and prevent her from working. She denies fever or upper respiratory symptoms and takes no medications. When moved quickly from a sitting to a lying position with her head turned and hanging below the horizontal plane, she complains of dizziness, and horizontal nystagmus is noted. What is the most likely diagnosis?

A. Orthostatic hypotension
B. Meniere disease
C. Acoustic neuroma
D. Benign paroxysmal positional vertigo (BPPV) (Correct Answer)

Explanation: **Explanation:** The clinical presentation is classic for **Benign Paroxysmal Positional Vertigo (BPPV)**. The diagnosis is based on the triad of: 1. **Positional Triggers:** Vertigo occurs specifically during changes in head position (sitting up, rolling in bed). 2. **Short Duration:** Episodes last seconds to less than a minute. 3. **Positive Dix-Hallpike Maneuver:** The description of moving the patient from sitting to lying with the head hanging is the Dix-Hallpike maneuver, which elicits characteristic nystagmus and vertigo in BPPV patients. **Pathophysiology:** BPPV is caused by **canalithiasis**—dislodged otoconia (calcium carbonate crystals) from the utricle entering the semicircular canals (most commonly the **posterior canal**). **Why other options are incorrect:** * **Orthostatic Hypotension:** Presents as lightheadedness or syncope upon standing, not true rotatory vertigo triggered by rolling in bed. * **Meniere’s Disease:** Characterized by a triad of episodic vertigo (lasting 20 mins to hours), sensorineural hearing loss, and tinnitus/aural fullness. It is not typically triggered by brief head movements. * **Acoustic Neuroma (Vestibular Schwannoma):** Presents with progressive unilateral sensorineural hearing loss and equilibrium imbalance rather than acute, brief episodes of positional vertigo. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Dix-Hallpike Maneuver. * **Characteristic Nystagmus:** In posterior canal BPPV, nystagmus is **geotropic** (beats toward the ground), **rotatory/torsional**, and has a **latency** (starts after 2-5 seconds) and **fatigability** (decreases with repeat testing). * **Treatment of Choice:** Canalith repositioning maneuvers, specifically the **Epley Maneuver**. * **Most common canal involved:** Posterior Semicircular Canal (85-90%).

Question 28: Which of the following is NOT true about benign paroxysmal positional vertigo?

A. Fatigability
B. Good reproducibility (Correct Answer)
C. Habituation
D. Latency

Explanation: **Explanation:** Benign Paroxysmal Positional Vertigo (BPPV) is the most common cause of peripheral vertigo, typically caused by canalolithiasis in the posterior semicircular canal. It is diagnosed using the **Dix-Hallpike Maneuver**. **Why "Good Reproducibility" is NOT true:** In BPPV, the characteristic nystagmus and vertigo show **poor reproducibility**. If the Dix-Hallpike maneuver is repeated multiple times in quick succession, the response becomes weaker or may not occur at all. This is due to the displacement and scattering of otoconia (calcium carbonate crystals) within the canal, making it harder to trigger the same neural response immediately. **Analysis of other options (Characteristics of BPPV):** * **Latency (D):** Vertigo and nystagmus do not start immediately. There is a delay of **5–20 seconds** after the head is moved into the provocative position. * **Fatigability (A) & Habituation (C):** These terms are often used interchangeably in this context. They refer to the phenomenon where the intensity of the nystagmus and vertigo **decreases with repeated testing**. This is a hallmark of peripheral vertigo (BPPV) and helps differentiate it from central causes of vertigo, which do not fatigue. **High-Yield Clinical Pearls for NEET-PG:** 1. **Most common canal involved:** Posterior Semicircular Canal (90%). 2. **Nystagmus pattern:** In posterior canal BPPV, the nystagmus is **geotropic** (beats toward the ground), **rotatory/torsional**, and **up-beating**. 3. **Treatment of choice:** **Epley’s Maneuver** (repositioning maneuver). For horizontal canal BPPV, the **Lempert (Barbecue) maneuver** is used. 4. **Duration:** Vertigo episodes typically last **less than one minute**.

Question 29: The site of lesion in unilateral past pointing nystagmus is?

A. Posterior semicircular canal
B. Superior semicircular canal
C. Flocculonodular lobe
D. Cerebellar hemisphere (Correct Answer)

Explanation: ### Explanation The correct answer is **D. Cerebellar hemisphere.** **1. Understanding the Mechanism** Past pointing (dysmetria) and nystagmus are classic signs of cerebellar dysfunction. When a lesion occurs in the **cerebellar hemisphere**, it disrupts the coordination of voluntary movements on the **ipsilateral** (same) side. * **Past pointing:** In cerebellar lesions, the patient overshoots the target because the cerebellum fails to provide the necessary "braking" signal to the muscles. * **Nystagmus:** Cerebellar nystagmus is typically coarse, gaze-evoked, and increases in intensity when looking toward the side of the lesion. The combination of unilateral past pointing and nystagmus strongly localizes the pathology to the cerebellar hemisphere rather than the vestibular apparatus. **2. Analysis of Incorrect Options** * **Options A & B (Posterior/Superior Semicircular Canals):** Lesions in the semicircular canals (like BPPV) cause positional vertigo and specific patterns of nystagmus (e.g., geotropic or torsional). While vestibular lesions cause past pointing, it is usually compensatory and occurs in the direction of the slow component of nystagmus, unlike the primary motor incoordination seen in cerebellar lesions. * **Option C (Flocculonodular Lobe):** This is the "vestibulocerebellum." Lesions here primarily cause **truncal ataxia** and equilibrium imbalances (drunken gait) rather than unilateral limb signs like past pointing. **3. Clinical Pearls for NEET-PG** * **Rule of Sides:** Cerebellar lesions produce **ipsilateral** symptoms (Ataxia, Hypotonia, Past pointing, Intention tremor). * **Vestibular vs. Cerebellar Nystagmus:** Vestibular nystagmus is suppressed by visual fixation; cerebellar nystagmus is **not** suppressed and may even be enhanced. * **Finger-Nose Test:** This is the standard clinical bedside test to elicit past pointing in suspected cerebellar hemisphere lesions.

Question 30: What components does the caloric test have?

A. Slow component only
B. Fast component only
C. Slow and fast components (Correct Answer)
D. Fast component occasionally

Explanation: **Explanation:** The caloric test is a clinical assessment of the vestibulo-ocular reflex (VOR) used to evaluate the function of the horizontal semicircular canal. When water (or air) that is warmer or cooler than body temperature is introduced into the external auditory canal, it creates a convection current in the endolymph. This stimulus triggers **nystagmus**, which by definition consists of two distinct phases: 1. **Slow Component (Vestibular phase):** This is the physiological response where the eyes slowly drift away from the midline due to the stimulation of the vestibular system. 2. **Fast Component (Corrective phase):** This is a rapid, jerky movement in the opposite direction, mediated by the brainstem (paramedian pontine reticular formation) to bring the eyes back to the center. **Why Option C is correct:** Nystagmus is an involuntary, rhythmic oscillation of the eyes. For a caloric test to be clinically interpretable, both the slow vestibular drift and the fast compensatory snap-back must be present. **Analysis of Incorrect Options:** * **Options A & B:** These are incorrect because a single component does not constitute nystagmus. While the slow component is the actual "vestibular" response, the fast component is what we clinically use to name the direction of the nystagmus. * **Option D:** The fast component is not occasional; it is a constant feature of the induced nystagmus in a conscious patient. **High-Yield Clinical Pearls for NEET-PG:** * **COWS Mnemonic:** **C**old **O**pposite, **W**arm **S**ame (refers to the direction of the **fast** component). * **Positioning:** The patient should be supine with the head tilted **30° upward** to bring the horizontal semicircular canal into a vertical plane. * **Fitzgerald-Hallpike Template:** This is the standard method using water at 30°C and 44°C. * **Canal Paresis:** A reduction in response of >20-25% on one side indicates a peripheral vestibular lesion.

Practice by Chapter

Anatomy and Physiology of Balance

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Vestibular Testing Methods

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Videonystagmography

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Rotational Chair Testing

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Vestibular Evoked Myogenic Potentials

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Video Head Impulse Test

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Benign Paroxysmal Positional Vertigo

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Vestibular Neuritis

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Ménière's Disease

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Vestibular Migraine

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Central Vertigo

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Vestibular Rehabilitation

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