Vestibular Disorders — MCQs

Vestibular Disorders Indian Medical PG Practice Questions and MCQs

Question 31: Which of the following defines vertigo?

A. Ringing of ears
B. Subjective sense of imbalance (Correct Answer)
C. Sense of pressure in the ear
D. Infection of the inner ear

Explanation: **Explanation:** **Vertigo** is defined as a **subjective sense of imbalance** or a false sensation of movement, where the patient feels that either they or their surroundings are spinning (rotatory vertigo). It is a hallmark symptom of vestibular dysfunction, resulting from a mismatch between visual, proprioceptive, and vestibular inputs. **Analysis of Options:** * **Option B (Correct):** Vertigo is not a diagnosis but a symptom. It represents a perceived disturbance in equilibrium. While "spinning" is the most common description, it encompasses any subjective illusion of motion. * **Option A (Incorrect):** Ringing or buzzing in the ears is defined as **Tinnitus**. While often associated with vertigo in conditions like Meniere’s disease, it is a distinct auditory symptom. * **Option C (Incorrect):** A sense of pressure or fullness in the ear is termed **Aural Fullness**. This is a classic feature of Endolymphatic Hydrops (Meniere’s). * **Option D (Incorrect):** Infection of the inner ear is called **Labyrinthitis**. While labyrinthitis *causes* vertigo, it is a pathological state, not the definition of the symptom itself. **High-Yield Clinical Pearls for NEET-PG:** * **Peripheral vs. Central Vertigo:** Peripheral vertigo (e.g., BPPV, Meniere’s) is usually severe, associated with horizontal nystagmus (suppressed by fixation), and often includes ear symptoms. Central vertigo (e.g., Brainstem stroke, MS) is usually less intense but associated with neurological deficits and vertical/non-suppressible nystagmus. * **BPPV:** The most common cause of peripheral vertigo; diagnosed by the **Dix-Hallpike maneuver** and treated with the **Epley maneuver**. * **Meniere’s Disease Triad:** Episodic vertigo, fluctuating sensorineural hearing loss (SNHL), and tinnitus.

Question 32: Coloric testing assesses the function of which structure?

A. Horizontal semicircular canal (Correct Answer)
B. Posterior semicircular canal
C. Anterior semicircular canal
D. Cochlea

Explanation: ### Explanation **1. Why Option A is Correct:** Caloric testing primarily assesses the **Horizontal Semicircular Canal (HSC)**. This is due to the anatomical orientation of the canals. During the test, the patient’s head is elevated to **30 degrees** from the supine position. This orientation brings the horizontal canal into a **vertical plane**. When cold or warm water/air is introduced into the ear canal, it creates a temperature gradient across the HSC. This causes the endolymph to move via **convection currents**, stimulating the vestibular hair cells and inducing nystagmus. **2. Why Other Options are Incorrect:** * **Options B & C (Posterior and Anterior Canals):** These are the vertical canals. Due to their anatomical positioning and distance from the tympanic membrane, they are not significantly affected by the thermal gradients produced during standard caloric irrigation. * **Option D (Cochlea):** The cochlea is the organ of hearing. Caloric testing is a specific test for the **vestibular system** (balance), not the auditory system. **3. Clinical Pearls for NEET-PG:** * **COWS Mnemonic:** Used to remember the direction of the **Fast Phase** of nystagmus: **C**old **O**pposite, **W**arm **S**ame. * **Fitzgerald-Hallpike Test:** The standard method for caloric testing using water at 30°C and 44°C. * **Canal Paresis:** A key finding in caloric testing; if the response from one ear is significantly weaker (usually >25% difference), it indicates a peripheral vestibular lesion on that side (e.g., Meniere’s disease, Vestibular Schwannoma). * **Prerequisite:** The tympanic membrane should ideally be intact; if perforated, air calorics are preferred over water.

Question 33: Which of the following is true about Meniere's disease?

A. Tinnitus
B. Episodic vertigo
C. Hearing loss
D. All of the above (Correct Answer)

Explanation: **Explanation:** Meniere’s disease (Endolymphatic Hydrops) is a disorder of the inner ear characterized by an abnormal accumulation of endolymph within the membranous labyrinth. The correct answer is **D (All of the above)** because the diagnosis is clinically defined by a classic triad of symptoms. 1. **Episodic Vertigo:** Patients experience spontaneous, recurrent attacks of rotational vertigo lasting 20 minutes to several hours, often accompanied by nausea and vomiting. 2. **Hearing Loss:** Characteristically, this is a **sensorineural hearing loss (SNHL)** that is initially fluctuating and involves **low frequencies** (rising curve on audiometry). Over time, it may become permanent and involve all frequencies. 3. **Tinnitus:** This is typically described as a low-pitched, "roaring" or "seashell" sound, which often worsens during an acute attack. **Why individual options are insufficient:** While A, B, and C are all cardinal features, selecting any single one would be incomplete. Meniere’s is a syndrome defined by the **co-existence** of these symptoms along with a sensation of **aural fullness**. **High-Yield Clinical Pearls for NEET-PG:** * **Pathophysiology:** Distension of the endolymphatic system due to a lack of absorption by the endolymphatic sac. * **Audiometry:** Early stages show low-frequency SNHL; advanced stages show a flat configuration. * **Glycerol Test:** A positive test (improvement in hearing after oral glycerol) indicates endolymphatic hydrops. * **Electrocochleography (ECoG):** Shows an increased **SP/AP ratio (>0.3)**. * **Management:** Low-salt diet, diuretics (Acetazolamide), and Betahistine for prophylaxis. Intratympanic Gentamicin is used for chemical labyrinthectomy in refractory cases.

Question 34: Endolymphatic decompression is a surgical procedure indicated for which condition?

A. Tinnitus
B. Acoustic neuroma
C. Meniere's disease (Correct Answer)
D. Perilymph fistula

Explanation: **Explanation:** **Meniere’s Disease (Endolymphatic Hydrops)** is characterized by an overaccumulation of endolymph within the inner ear, leading to increased pressure. The primary goal of surgical intervention in medically refractory cases is to reduce this pressure. **Endolymphatic Sac Decompression (or Shunt)** is a conservative surgical procedure where the bone covering the endolymphatic sac is removed (with or without a shunt placement) to allow the sac to expand, thereby facilitating better drainage or resorption of endolymph. **Analysis of Incorrect Options:** * **Tinnitus:** While a symptom of many ear pathologies (including Meniere’s), it is not a diagnosis. Treatment focuses on the underlying cause or masking therapies, not sac decompression. * **Acoustic Neuroma:** This is a benign tumor of the 8th cranial nerve. Management involves observation, radiotherapy, or surgical excision (e.g., translabyrinthine or retrosigmoid approach), not pressure decompression of the endolymphatic system. * **Perilymph Fistula:** This involves a leak of perilymph from the oval or round window. Treatment involves bed rest or surgical patching of the fistula, not decompression. **High-Yield Clinical Pearls for NEET-PG:** * **Meniere’s Tetrad:** Episodic vertigo, fluctuating sensorineural hearing loss (SNHL), tinnitus, and aural fullness. * **Staging of Surgery:** Endolymphatic decompression is "conservative" (preserves hearing). If it fails and hearing is non-serviceable, "destructive" procedures like **Labyrinthectomy** or **Vestibular Nerve Section** are considered. * **Medical Management:** First-line treatment includes a low-salt diet, diuretics (Acetazolamide), and Betahistine. * **Glycerol Test:** Used for diagnosis; an osmotic diuretic that temporarily improves hearing by reducing hydrops.

Question 35: What is the response seen with bilateral cold water irrigation of the ears?

A. Upbeat nystagmus and downward movement of the eye (Correct Answer)
B. Downbeat nystagmus and upward movement of the eye
C. Rotatory nystagmus
D. None of the above

Explanation: ### Explanation The correct answer is **A. Upbeat nystagmus and downward movement of the eye.** #### 1. Underlying Medical Concept Caloric testing typically involves unilateral irrigation to stimulate the horizontal semicircular canal. However, **bilateral simultaneous irrigation** stimulates the vertical canals. * **Cold water** is inhibitory. When cold water is applied to both ears simultaneously, it inhibits the vestibular system on both sides. * In the vestibular-ocular reflex (VOR) pathway, bilateral inhibition of the canals (specifically the superior canals) results in a **slow downward phase** of eye movement. * Nystagmus is named after its **fast corrective phase**, which occurs in the opposite direction of the slow phase. Therefore, the eyes move slowly downward, followed by a fast corrective upward flick, resulting in **upbeat nystagmus**. #### 2. Analysis of Incorrect Options * **Option B:** Downbeat nystagmus and upward movement of the eye is the response seen with **bilateral warm water irrigation**. Warm water is excitatory; it causes a slow upward phase and a fast downward corrective phase (downbeat nystagmus). * **Option C:** Rotatory nystagmus is typically seen in Benign Paroxysmal Positional Vertigo (BPPV) during the Dix-Hallpike maneuver, or during caloric testing if the head is tilted in specific planes, but it is not the standard response to bilateral cold irrigation. #### 3. High-Yield Clinical Pearls for NEET-PG * **COWS Mnemonic:** For unilateral irrigation, remember **C**old **O**pposite, **W**arm **S**ame (refers to the direction of the fast phase/nystagmus). * **Positioning:** For caloric testing, the patient’s head is elevated **30 degrees** to bring the horizontal canal into a vertical plane. * **Bilateral Caloric Testing:** This is often used in the evaluation of brainstem integrity and comatose patients. * **Vertical Nystagmus:** While bilateral caloric testing can induce it physiologically, *spontaneous* vertical nystagmus (especially downbeat) usually indicates a **central lesion** (e.g., craniocervical junction anomalies like Arnold-Chiari malformation).

Question 36: Epley's maneuver is performed for which of the following conditions?

A. Positional vertigo (Correct Answer)
B. Otosclerosis
C. Acute suppurative otitis media
D. Chronic suppurative otitis media

Explanation: **Explanation:** **Epley’s maneuver** is the gold standard treatment for **Benign Paroxysmal Positional Vertigo (BPPV)**, which is the most common cause of **positional vertigo**. The underlying pathophysiology of BPPV involves **canalithiasis**, where free-floating calcium carbonate crystals (otoconia) from the utricle displace into the semicircular canals (most commonly the **posterior canal**). Epley’s maneuver is a "canalith repositioning procedure" that uses a sequence of head movements to gravity-maneuver these particles out of the semicircular canal and back into the utricle, thereby resolving the vertigo. **Analysis of Incorrect Options:** * **Otosclerosis:** This is a metabolic bone disease of the otic capsule causing stapes fixation and conductive hearing loss. It is treated surgically with **Stapedotomy/Stapedectomy**, not maneuvers. * **Acute Suppurative Otitis Media (ASOM):** This is an acute bacterial infection of the middle ear. Management involves antibiotics and potentially a myringotomy. * **Chronic Suppurative Otitis Media (CSOM):** This involves permanent changes in the middle ear (perforation/cholesteatoma). Treatment is medical (ear drops) or surgical (Tympanoplasty/Mastoidectomy). **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** BPPV is diagnosed using the **Dix-Hallpike Maneuver** (look for geotropic nystagmus with latency and fatigability). * **Most Common Canal:** Posterior Semicircular Canal (90%). * **Semont Maneuver:** An alternative "liberatory maneuver" for BPPV. * **Medical Management:** Vestibular sedatives (like Cinnarizine or Betahistine) are generally avoided in BPPV as they delay central compensation; physical repositioning is the definitive treatment.

Question 37: The Hallpike test is performed to assess which of the following?

A. Vestibular function
B. Tinnitus
C. Vertigo (Correct Answer)
D. Facial weakness

Explanation: **Explanation:** The **Dix-Hallpike test** (or Hallpike maneuver) is the gold standard clinical test for diagnosing **Benign Paroxysmal Positional Vertigo (BPPV)**, specifically involving the posterior semicircular canal. **Why Option C is Correct:** The test involves moving the patient from a sitting to a supine position with the head turned 45° to one side and extended 20° back. This movement causes the displaced calcium carbonate crystals (otoconia) to move within the semicircular canal, triggering a brief episode of **vertigo** and characteristic **rotatory nystagmus**. Therefore, it is used to assess and confirm the cause of positional vertigo. **Why Other Options are Incorrect:** * **A. Vestibular function:** While BPPV is a vestibular disorder, "vestibular function" is a broad term usually assessed by tests like the Caloric test, vHIT (Video Head Impulse Test), or VEMP. The Hallpike test is specific for positional vertigo. * **B. Tinnitus:** Tinnitus is a subjective sound perception. It is assessed via audiological evaluations like pure-tone audiometry or tinnitogram, not positional maneuvers. * **D. Facial weakness:** This is assessed by clinical examination of the muscles of facial expression (Cranial Nerve VII) and Topodiagnostic tests (e.g., Schirmer’s test). **High-Yield Clinical Pearls for NEET-PG:** * **Latent Period:** In BPPV, there is a 5–20 second delay between the maneuver and the onset of nystagmus/vertigo. * **Fatigability:** If the test is repeated, the symptoms and nystagmus decrease in intensity. * **Treatment:** Once diagnosed by the Dix-Hallpike test, BPPV is treated using the **Epley maneuver** (canalith repositioning). * **Geotropic vs. Ageotropic Nystagmus:** If horizontal canal BPPV is suspected, the **Roll Test** is performed instead of Dix-Hallpike.

Question 38: The glycerol test is used for the diagnosis of which condition?

A. Meniere's disease (Correct Answer)
B. Otosclerosis
C. Acute suppurative otitis media (ASOM)
D. Malignant otitis externa

Explanation: **Explanation:** **Meniere’s Disease (Correct Answer):** The Glycerol test is a diagnostic tool for **Endolymphatic Hydrops** (the pathological hallmark of Meniere’s disease). Glycerol is an osmotic diuretic. When administered orally (1.5 ml/kg), it increases the osmolality of the blood, creating an osmotic gradient that draws excess fluid out of the endolymphatic space. * **Positive Result:** An improvement in hearing (defined as a gain of 10 dB or more in two or more frequencies, or a 10% improvement in speech discrimination scores) within 1–3 hours indicates reversible hydrops. **Why other options are incorrect:** * **Otosclerosis:** This is a bony remodeling disorder of the otic capsule causing stapes fixation. Diagnosis is primarily clinical (conductive hearing loss, Carhart’s notch) and confirmed via impedance audiometry (A_s type tympanogram) and absent stapedial reflexes. * **ASOM:** This is an acute bacterial infection of the middle ear. Diagnosis is based on clinical history (earache, fever) and otoscopic findings (bulging, congested TM). * **Malignant Otitis Externa:** This is a necrotizing infection of the external auditory canal (usually *Pseudomonas* in diabetics). Diagnosis involves clinical examination (granulation tissue at the bony-cartilaginous junction) and imaging (Technetium-99 or Gallium-67 scans). **High-Yield Clinical Pearls for NEET-PG:** 1. **Electrocochleography (ECoG):** The most sensitive objective test for Meniere’s; look for an increased **SP/AP ratio (>0.30)**. 2. **Caloric Test:** Shows **Canal Paresis** on the affected side in 75% of Meniere's cases. 3. **Lermoyez Phenomenon:** A variant of Meniere’s where hearing *improves* during a vertigo attack. 4. **Burnett’s Syndrome:** Another name for the Glycerol test.

Question 39: Which of the following can differentiate between vestibular system dysfunction and cochlear nerve lesion?

A. Caloric test
B. Rotation test
C. Galvanic test
D. All of the above (Correct Answer)

Explanation: To differentiate between a **vestibular system (end-organ)** lesion and a **cochlear/vestibular nerve (retrocochlear)** lesion, we must evaluate which tests depend on the integrity of the sensory hair cells versus the nerve fibers. ### **Explanation** The core concept lies in the **site of stimulation**: * **Caloric and Rotation Tests:** These tests rely on the movement of endolymph to stimulate the hair cells in the semicircular canals. If the end-organ (vestibular system) is damaged, these tests will show a diminished response (canal paresis). However, they cannot bypass the end-organ to test the nerve directly. * **Galvanic Test:** This test uses an electrical current applied to the mastoid. Unlike caloric or rotation tests, the galvanic stimulus **bypasses the hair cells** and directly stimulates the vestibular nerve fibers. **Why "All of the Above" is correct:** 1. **Caloric Test (A) & Rotation Test (B):** These will be abnormal in vestibular end-organ lesions (e.g., Meniere’s) but may also be abnormal in nerve lesions because the signal cannot reach the brain. 2. **Galvanic Test (C):** This is the "differentiator." In a **pure end-organ lesion**, the galvanic test remains **normal** (because the nerve is intact). In a **nerve lesion** (e.g., Vestibular Schwannoma), the galvanic test will be **abnormal**. By comparing the results of these tests, a clinician can localize the pathology. ### **High-Yield Clinical Pearls for NEET-PG** * **Galvanic Test Localization:** * Response present = End-organ lesion (Nerve is healthy). * Response absent = Retrocochlear/Nerve lesion. * **Caloric Test Formula:** Jongkees’ formula is used to calculate canal paresis (Significant if >25%). * **COWS Mnemonic:** For Caloric testing (Normal response) — **C**old **O**pposite, **W**arm **S**ame (refers to the direction of the fast phase of nystagmus).

Question 40: Vestibular Evoked Myogenic Potential (VEMP) has been used in the assessment of which structure?

A. Cochlear nerve function
B. Superior vestibular nerve function
C. Inferior vestibular nerve function (Correct Answer)
D. Inflammatory myopathy

Explanation: **Explanation:** **Vestibular Evoked Myogenic Potential (VEMP)** is a diagnostic test used to evaluate the function of the otolith organs (saccule and utricle) and their associated vestibular nerve pathways. The correct answer is **C (Inferior vestibular nerve function)** because the standard **cervical VEMP (cVEMP)** specifically tests the **Saccule** and the **Inferior Vestibular Nerve**. * **Mechanism:** A loud sound stimulus triggers an inhibitory reflex in the tonically contracted sternocleidomastoid (SCM) muscle. * **Pathway:** Saccule → Inferior Vestibular Nerve → Vestibular Nucleus → Medial Vestibulospinal Tract → XI Nerve (Accessory) → SCM muscle. **Analysis of Incorrect Options:** * **Option A:** Cochlear nerve function is assessed via **Pure Tone Audiometry (PTA)** or **Brainstem Auditory Evoked Response (BAER/BERA)**, not VEMP. * **Option B:** Superior vestibular nerve function is primarily assessed by **ocular VEMP (oVEMP)**, which tests the **Utricle**, or by the **Caloric test** (which tests the Horizontal Semicircular Canal). * **Option C:** While VEMP involves myogenic (muscle) potentials, it is a neuro-otological test for vestibular reflex arcs, not a diagnostic tool for primary inflammatory myopathies (which require EMG or biopsy). **High-Yield Clinical Pearls for NEET-PG:** 1. **cVEMP:** Tests Saccule + Inferior Vestibular Nerve (Ipsilateral inhibitory response). 2. **oVEMP:** Tests Utricle + Superior Vestibular Nerve (Contralateral excitatory response). 3. **Superior Semicircular Canal Dehiscence (SSCD):** VEMP is highly sensitive here; patients show **abnormally low thresholds** (they respond to much quieter sounds than normal). 4. **Meniere’s Disease:** VEMP can show reduced amplitudes or absent responses as the disease progresses.

Practice by Chapter

Anatomy and Physiology of Balance

Practice Questions

Vestibular Testing Methods

Practice Questions

Videonystagmography

Practice Questions

Rotational Chair Testing

Practice Questions

Vestibular Evoked Myogenic Potentials

Practice Questions

Video Head Impulse Test

Practice Questions

Benign Paroxysmal Positional Vertigo

Practice Questions

Vestibular Neuritis

Practice Questions

Ménière's Disease

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Vestibular Migraine

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Central Vertigo

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Vestibular Rehabilitation

Practice Questions

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