Vestibular Disorders Practice Questions

Q: Which of the following defines vertigo?

Subjective sense of imbalance. **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.

Q: Coloric testing assesses the function of which structure?

Horizontal semicircular canal. ### 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.

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

All of the above. **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.

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

Meniere's disease. **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.

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

Positional vertigo. **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.

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

Vertigo. **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.

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

Meniere's disease. **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.

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

All of the above. 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).

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

Inferior vestibular nerve function. **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.

Question 1

Which of the following defines vertigo?

Accepted Answer

Subjective sense of imbalance

Answer

Ringing of ears

Answer

Sense of pressure in the ear

Answer

Infection of the inner ear

Question 2

Coloric testing assesses the function of which structure?

Accepted Answer

Horizontal semicircular canal

Answer

Posterior semicircular canal

Answer

Anterior semicircular canal

Answer

Cochlea

Question 3

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

Accepted Answer

All of the above

Answer

Tinnitus

Answer

Episodic vertigo

Answer

Hearing loss

Question 4

Endolymphatic decompression is a surgical procedure indicated for which condition?

Accepted Answer

Meniere's disease

Answer

Tinnitus

Answer

Acoustic neuroma

Answer

Perilymph fistula

Question 5

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

Accepted Answer

Upbeat nystagmus and downward movement of the eye

Answer

Downbeat nystagmus and upward movement of the eye

Answer

Rotatory nystagmus

Answer

None of the above

Question 6

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

Accepted Answer

Positional vertigo

Answer

Otosclerosis

Answer

Acute suppurative otitis media

Answer

Chronic suppurative otitis media

Question 7

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

Accepted Answer

Vertigo

Answer

Vestibular function

Answer

Tinnitus

Answer

Facial weakness

Question 8

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

Accepted Answer

Meniere's disease

Answer

Otosclerosis

Answer

Acute suppurative otitis media (ASOM)

Answer

Malignant otitis externa

Question 9

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

Accepted Answer

All of the above

Answer

Caloric test

Answer

Rotation test

Answer

Galvanic test

Question 10

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

Accepted Answer

Inferior vestibular nerve function

Answer

Cochlear nerve function

Answer

Superior vestibular nerve function

Answer

Inflammatory myopathy

Vestibular Disorders — MCQs

Vestibular Disorders — MCQs

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