Vestibular Disorders — MCQs

Vestibular Disorders Indian Medical PG Practice Questions and MCQs

Question 11: What is a characteristic feature of central nystagmus?

A. Suppressed by optic fixation
B. More than 1 minute duration (Correct Answer)
C. Fixed direction
D. Fatiguable

Explanation: ### Explanation Nystagmus is a rhythmic, involuntary oscillation of the eyes. Distinguishing between **Peripheral** (inner ear/vestibular nerve) and **Central** (brainstem/cerebellum) causes is a high-yield competency for NEET-PG. **1. Why "More than 1 minute duration" is correct:** In central vestibular lesions (e.g., stroke, tumors, or MS), the nystagmus is typically persistent. When performing the Dix-Hallpike maneuver, central nystagmus lacks the characteristic "fatigue" seen in BPPV. It begins immediately (no latency) and continues as long as the head is held in the provoking position, often lasting **well beyond 1 minute**. **2. Analysis of Incorrect Options:** * **A. Suppressed by optic fixation:** This is a hallmark of **Peripheral nystagmus**. In central lesions, the cerebellum is often involved; since the cerebellum is responsible for the fixation reflex, central nystagmus is **not suppressed** (and may even be enhanced) by focusing on an object. * **C. Fixed direction:** Central nystagmus is often **direction-changing** (e.g., changes direction based on the gaze). Peripheral nystagmus is typically unidirectional (fixed direction). * **D. Fatiguable:** Peripheral nystagmus (specifically in BPPV) is fatiguable, meaning the intensity diminishes with repeated testing. Central nystagmus is **non-fatiguable**. ### Clinical Pearls for NEET-PG: | Feature | Peripheral Nystagmus | Central Nystagmus | | :--- | :--- | :--- | | **Latency** | 3–20 seconds | No latency (Immediate) | | **Duration** | < 1 minute | **> 1 minute (Persistent)** | | **Fatigability** | Yes | No | | **Fixation** | Suppresses nystagmus | No effect/Enhances | | **Direction** | Horizontal/Torsional | **Purely Vertical** (Upbeat/Downbeat) or Purely Torsional | **High-Yield Note:** Purely vertical nystagmus (upbeat or downbeat) is **always** central until proven otherwise.

Question 12: Spontaneous vertical nystagmus is seen in a lesion of which structure?

A. Midbrain (Correct Answer)
B. Labyrinth
C. Vestibule
D. Cochlea

Explanation: **Explanation:** The presence of **spontaneous vertical nystagmus** (upbeat or downbeat) is a hallmark sign of a **Central Vestibular Lesion**. 1. **Why Midbrain is Correct:** Vertical eye movements are controlled by the rostral midbrain (specifically the interstitial nucleus of Cajal and the rostral interstitial nucleus of the medial longitudinal fasciculus). Lesions in the **midbrain**, pons, or cerebellum disrupt these central pathways. Unlike peripheral disorders, central lesions do not require a specific head position to trigger nystagmus; it is often spontaneous and cannot be suppressed by visual fixation. 2. **Why Other Options are Incorrect:** * **Labyrinth & Vestibule:** These are peripheral vestibular structures. Lesions here (e.g., Meniere’s, Vestibular Neuronitis) typically produce **horizontal or horizontal-torsional nystagmus**. Purely vertical nystagmus is almost never peripheral in origin. * **Cochlea:** This structure is responsible for hearing, not balance. A lesion here would cause sensorineural hearing loss or tinnitus, not nystagmus. **High-Yield Clinical Pearls for NEET-PG:** * **Alexander’s Law:** Peripheral nystagmus increases in intensity when looking in the direction of the fast phase. * **Direction of Nystagmus:** * **Downbeat Nystagmus:** Classically associated with lesions at the **craniocervical junction** (e.g., Arnold-Chiari malformation). * **Upbeat Nystagmus:** Associated with lesions in the **medulla or midbrain**. * **Visual Fixation:** Suppresses peripheral nystagmus but has no effect on (or may even worsen) central nystagmus.

Question 13: Hearing loss in Meniere's disease is typically of what type?

A. Fluctuating sensorineural hearing loss (SNHL) (Correct Answer)
B. Progressive sensorineural hearing loss (SNHL)
C. Conductive hearing loss
D. Mixed hearing loss

Explanation: **Explanation:** **Meniere’s Disease (Endolymphatic Hydrops)** is characterized by an accumulation of endolymph within the inner ear, leading to increased pressure. The hallmark of the hearing loss in this condition is its **fluctuating** nature. During an attack, the distension of the membranous labyrinth causes a **low-frequency Sensorineural Hearing Loss (SNHL)**. Between attacks, the pressure often subsides, and hearing may return to near-normal levels, especially in the early stages. This "up and down" pattern is the defining clinical feature. **Analysis of Options:** * **Option A (Correct):** The hearing loss is SNHL because it involves the cochlea. It is fluctuating because the endolymphatic pressure varies over time. * **Option B (Incorrect):** While hearing loss can become permanent and progressive in late-stage Meniere’s (Burn-out stage), the *typical* and diagnostic presentation is fluctuating. Purely progressive SNHL is more characteristic of Presbycusis or Acoustic Neuroma. * **Option C & D (Incorrect):** Meniere’s is an inner ear pathology. Conductive or mixed hearing loss implies middle or external ear involvement (e.g., Otosclerosis or Chronic Suppurative Otitis Media), which is not present here. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Vertigo, Tinnitus, and Fluctuating SNHL (plus aural fullness). * **Audiometry:** Shows a **"Rising Curve"** (low-frequency loss) in early stages; becomes flat in later stages. * **Recruitment Phenomenon:** Positive (characteristic of cochlear lesions). * **Glycerol Test:** Used for diagnosis; glycerol acts as an osmotic diuretic, temporarily improving hearing by reducing endolymphatic pressure. * **Lermoyez Syndrome:** A variant where hearing *improves* during a vertigo attack.

Question 14: Which of the following is NOT a cause of vertigo of vestibular origin?

A. Ménière's disease
B. Benign Paroxysmal Positional Vertigo (BPPV)
C. Vertebrobasilar insufficiency (Correct Answer)
D. Vestibular neuronitis

Explanation: **Explanation:** The classification of vertigo is broadly divided into **Peripheral (Vestibular)** and **Central** causes. Peripheral vertigo arises from pathologies in the inner ear or the vestibular nerve, whereas central vertigo originates from the brainstem or cerebellum. **Why Vertebrobasilar Insufficiency (VBI) is the correct answer:** VBI is a **Central cause** of vertigo. It occurs due to transient ischemia of the brainstem, cerebellum, or visual cortex. While it presents with vertigo, it is typically associated with "D's": Diplopia, Dysarthria, Dysphagia, and Drop attacks. Since the pathology lies in the vascular supply to the central nervous system rather than the vestibular apparatus itself, it is not considered "vestibular origin" in the peripheral sense. **Analysis of Incorrect Options (Peripheral Causes):** * **Ménière's disease:** A peripheral disorder characterized by endolymphatic hydrops. It presents with the classic triad of episodic vertigo, sensorineural hearing loss, and tinnitus. * **BPPV:** The most common cause of peripheral vertigo, caused by canalithiasis (usually in the posterior semicircular canal). It is triggered by specific head movements. * **Vestibular neuronitis:** An acute peripheral vestibulopathy, often post-viral, involving inflammation of the vestibular nerve. It causes severe vertigo without hearing loss. **High-Yield Clinical Pearls for NEET-PG:** * **HINTS Exam:** Used to differentiate central from peripheral vertigo (Head Impulse, Nystagmus, Test of Skew). * **Nystagmus:** In peripheral vertigo, nystagmus is usually horizontal/rotatory and suppressed by visual fixation. In central vertigo (like VBI), it can be purely vertical and is **not** suppressed by fixation. * **Hearing Loss:** Common in peripheral causes (except BPPV/Neuronitis) but rare in central causes.

Question 15: Which of the following is NOT a test for vestibular function?

A. Galvanic stimulation
B. Fistula test
C. Acoustic reflex (Correct Answer)
D. Cold caloric test

Explanation: The correct answer is **C. Acoustic reflex**. ### **Explanation** The **Acoustic Reflex** (also known as the Stapedial Reflex) is a test of **auditory function**, not vestibular function. It involves the involuntary contraction of the stapedius muscle in response to high-intensity sound stimuli. This reflex arc involves the **Cochlear nerve (CN VIII - Sensory)** and the **Facial nerve (CN VII - Motor)**. It is used clinically to assess middle ear pathologies (like Otosclerosis), cochlear function, and the integrity of the facial nerve. ### **Why the other options are Vestibular Tests:** * **Galvanic Stimulation (A):** This test uses electrical current applied to the mastoid to stimulate the **vestibular nerve** directly. It helps differentiate between lesions of the end-organ (labyrinth) and the vestibular nerve. * **Fistula Test (B):** This is used to identify a **perilymph fistula** (abnormal communication between the inner and middle ear). Applying pressure to the external canal induces vertigo and nystagmus if a fistula is present (Hennebert’s sign). * **Cold Caloric Test (D):** Part of the VNG/ENG battery, this uses thermal irrigation (water or air) to induce convection currents in the **Semicircular canals** (primarily horizontal). It assesses the Vestibulo-Ocular Reflex (VOR). ### **High-Yield Clinical Pearls for NEET-PG:** * **COWS Mnemonic:** For Caloric testing, **C**old **O**pposite, **W**arm **S**ame (refers to the direction of the fast phase of nystagmus). * **Hennebert’s Sign:** A positive fistula test without a clinical fistula, seen in **Meniere’s disease** or **Congenital Syphilis**. * **Tullio Phenomenon:** Vertigo induced by loud sounds; seen in Superior Semicircular Canal Dehiscence (SSCD). * **Gold Standard:** The **Electronystagmography (ENG)** or **Videonystagmography (VNG)** are the standard batteries for comprehensive vestibular evaluation.

Question 16: In the caloric test, left jerk nystagmus occurs when?

A. Cold water is poured in the right ear (Correct Answer)
B. Hot water is poured in the right ear
C. Cold water is poured in the left ear
D. Hot water is poured in the left ear

Explanation: ### Explanation The caloric test evaluates the function of the lateral semicircular canal by inducing convection currents in the endolymph through temperature changes. The direction of the resulting nystagmus is easily remembered by the mnemonic **COWS**: **C**old **O**pposite, **W**arm **S**ame. **1. Why Option A is Correct:** When **cold water** is poured into the **right ear**, it causes the endolymph to become denser and sink. This creates a current away from the ampulla (ampullofugal), leading to inhibition of the right vestibular system. This results in a slow component toward the right and a fast corrective component (jerk nystagmus) toward the **left** (the opposite side). **2. Analysis of Incorrect Options:** * **Option B:** Hot water in the right ear would cause endolymph to rise (ampullopetal), stimulating the right side and causing **right** jerk nystagmus (Warm Same). * **Option C:** Cold water in the left ear would cause nystagmus to the **right** (Cold Opposite). * **Option D:** Hot water in the left ear would cause nystagmus to the **left** (Warm Same). **3. Clinical Pearls for NEET-PG:** * **Patient Positioning:** The patient is placed supine with the head tilted **30° up** to bring the horizontal semicircular canal into a vertical plane. * **Standard Temperatures:** Cold water is **30°C** and warm water is **44°C** (7°C below and above body temperature). * **Canal Paresis:** A common finding in Meniere’s disease or Vestibular Neuronitis, where the response from one ear is significantly reduced compared to the other. * **Directional Preponderance:** When nystagmus in one direction (e.g., to the right) is stronger than the other, regardless of which ear is stimulated.

Question 17: The cold caloric test stimulates which part of the inner ear?

A. Cochlea
B. Lateral semicircular canal (Correct Answer)
C. Posterior semicircular canal
D. All the above

Explanation: **Explanation:** The caloric test is a component of the electronystagmography (ENG) battery used to assess the **vestibulo-ocular reflex (VOR)**. **Why the Lateral Semicircular Canal (LSCC) is correct:** The test is performed with the patient’s head tilted **30 degrees upwards** from the supine position. This orientation brings the lateral semicircular canal into a **vertical plane**. When cold (30°C) or warm (44°C) water/air is introduced into the ear canal, it creates a temperature gradient across the LSCC. This causes a change in the density of the endolymph, inducing **convection currents**. These currents deflect the cupula, triggering a vestibular response and nystagmus. The LSCC is the primary responder because it is the canal closest to the external auditory meatus and the middle ear space. **Why other options are incorrect:** * **A. Cochlea:** This is the organ of hearing. Caloric stimulation targets the vestibular system (balance), not the auditory system. * **C. Posterior semicircular canal:** While part of the vestibular system, its anatomical position (deeper and oriented differently) prevents it from being significantly affected by the thermal convection currents generated during this specific bedside test. **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). * **Temperature:** Cold is 30°C, Warm is 44°C (7°C below/above body temperature). * **Canal Paresis:** A difference of >20-25% between the two ears suggests a peripheral vestibular lesion on the side of the reduced response (calculated via Jongkees’ formula). * **Prerequisite:** The tympanic membrane should ideally be intact; if perforated, air calorics or Dundas Grant cold air douche is used.

Question 18: The Hallpike maneuver is performed to diagnose which condition?

A. Benign paroxysmal positional vertigo (Correct Answer)
B. Meniere's disease
C. Tinnitus
D. Acoustic neuroma

Explanation: The **Dix-Hallpike maneuver** is the gold-standard clinical test for diagnosing **Benign Paroxysmal Positional Vertigo (BPPV)**, specifically involving the posterior semicircular canal. ### Why the Correct Answer is Right: BPPV is caused by **canalithiasis**—dislodged otoconia (calcium carbonate crystals) from the utricle that enter the semicircular canals. The Hallpike maneuver 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 otoconia to shift, stimulating the cupula and triggering a characteristic **paroxysmal crescendo-decrescendo nystagmus** and vertigo. A positive test confirms the diagnosis. ### Why Other Options are Wrong: * **Meniere’s Disease:** This is an inner ear disorder characterized by the triad of episodic vertigo, fluctuating sensorineural hearing loss, and tinnitus. It is diagnosed via clinical history and audiometry, not positional maneuvers. * **Tinnitus:** This is a symptom (ringing in the ears), not a specific disease. It requires audiological evaluation to find the underlying cause. * **Acoustic Neuroma:** A benign tumor of the 8th cranial nerve. Diagnosis is primarily made via **Contrast-enhanced MRI** (Gold Standard) and Pure Tone Audiometry (showing retrocochlear hearing loss). ### High-Yield Clinical Pearls for NEET-PG: * **Nystagmus in BPPV:** It has a **latency** (3–10 seconds), is **fatigable** (decreases with repeat testing), and is typically **rotatory/upbeating** (for posterior canal). * **Treatment:** While Hallpike is for *diagnosis*, the **Epley maneuver** (or Semont maneuver) is used for *treatment* (repositioning the crystals). * **Lateral Canal BPPV:** Diagnosed using the **Supine Roll Test** (McClure-Pagnini test) and treated with the **Lempert (Barbecue) maneuver**.

Question 19: Downbeat nystagmus is characteristic of which of the following?

A. Vestibular lesion
B. Posterior fossa lesion (Correct Answer)
C. Cerebellar lesion
D. Labyrinthine lesion

Explanation: **Explanation:** **Downbeat nystagmus** is a type of central vestibular nystagmus where the fast phase is directed downwards. It is a hallmark sign of a **Posterior Fossa Lesion**, specifically those involving the **craniocervical junction** (e.g., Arnold-Chiari malformation) or the **cerebellum** (specifically the vestibulocerebellum/flocculus). 1. **Why it is correct:** The vertical eye movement pathways are regulated by the brainstem and cerebellum within the posterior fossa. Lesions at the level of the foramen magnum or the cerebellar flocculus disrupt the inhibitory control over the vestibular nuclei, resulting in an upward drift of the eyes followed by a corrective downward fast phase (downbeat nystagmus). 2. **Why other options are incorrect:** * **Vestibular and Labyrinthine lesions (A & D):** Peripheral vestibular disorders (inner ear) typically cause **horizontal-torsional** nystagmus. Purely vertical nystagmus (upbeat or downbeat) is almost always a sign of a central nervous system pathology. * **Cerebellar lesion (C):** While cerebellar lesions *can* cause downbeat nystagmus, "Posterior Fossa Lesion" is the more comprehensive and clinically accurate answer in the context of NEET-PG, as it encompasses both cerebellar and brainstem/craniocervical junction pathologies (like Syringobulbia or Chiari malformation). **High-Yield Clinical Pearls for NEET-PG:** * **Upbeat Nystagmus:** Usually indicates a lesion in the **medulla** or **midbrain**. * **Alexander’s Law:** Nystagmus of peripheral origin increases in intensity when looking in the direction of the fast phase. * **Central vs. Peripheral Nystagmus:** Central nystagmus is non-fatigable, lacks a latent period, and is not suppressed by visual fixation. * **Most common cause of Downbeat Nystagmus:** Arnold-Chiari Malformation (Type 1).

Question 20: Which of the following are characteristic features of Meniere's disease?

A. Vertigo, ear discharge, tinnitus, and headache
B. Vertigo, tinnitus, hearing loss, and headache
C. Conductive hearing loss and tinnitus
D. Vertigo, tinnitus, and hearing loss (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. #### 1. Why Option D is Correct The classic clinical presentation of Meniere’s disease is defined by a **diagnostic triad**: * **Episodic Vertigo:** Spontaneous, rotatory vertigo lasting 20 minutes to several hours, often accompanied by nausea and vomiting. * **Sensorineural Hearing Loss (SNHL):** Characteristically fluctuating and low-frequency in the early stages. * **Tinnitus:** Often described as low-pitched or "roaring" in nature. * *Note:* A fourth feature, **Aural Fullness**, is frequently present, making it a "tetrad." #### 2. Why Other Options are Incorrect * **Option A:** **Ear discharge (Otorrhea)** is a hallmark of middle ear pathology (e.g., CSOM) and is never seen in Meniere’s, which is an inner ear pathology with an intact tympanic membrane. * **Option B:** While vertigo, tinnitus, and hearing loss are present, **Headache** is not a diagnostic feature of Meniere’s. Its presence should raise suspicion of Vestibular Migraine. * **Option C:** Meniere’s causes **Sensorineural** hearing loss, not Conductive hearing loss. Conductive loss suggests pathology in the external or middle ear (e.g., Otosclerosis). #### 3. NEET-PG High-Yield Clinical Pearls * **Pathology:** Distension of the membranous labyrinth (Endolymphatic hydrops); **Reissner’s membrane** is the most common site of rupture. * **Audiometry:** Shows low-frequency SNHL; **Rising curve** or "tent-shaped" audiogram is characteristic. * **Recruitment Phenomenon:** Positive (indicates cochlear pathology). * **Glycerol Test:** Used for diagnosis; dehydration of the labyrinth leads to temporary improvement in hearing. * **Management:** Low-salt diet and diuretics are first-line; **Betahistine** is used for maintenance. For refractory cases, intratympanic Gentamicin or Endolymphatic sac decompression is considered.

Practice by Chapter

Anatomy and Physiology of Balance

Practice Questions

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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