Vestibular Disorders Practice Questions

Q: All of the following are seen in Meniere's Disease except:

Ear Pain. ***Ear Pain*** - **Otalgia** (ear pain) is not a typical symptom of **Meniere's disease**. - While patients may experience discomfort due to pressure, sharp or significant pain is generally absent. *Fullness of ear* - A sensation of **aural fullness** or pressure in the affected ear is a characteristic symptom of Meniere's disease, often preceding a vertiginous attack. - This symptom is thought to be due to the buildup of **endolymphatic fluid** within the inner ear. *Vertigo* - **Episodic rotational vertigo** is a hallmark symptom of Meniere's disease, significantly impacting daily activities and often accompanied by nausea and vomiting. - These attacks are typically sudden, severe, and can last from 20 minutes to several hours. *Tinnitus* - **Tinnitus**, often described as a ringing, buzzing, or roaring sound, is a common symptom in patients with Meniere's disease. - It usually fluctuates in intensity and can worsen before or during a vertigo attack.

Q: A 47-year-old man presents to the emergency room with symptoms of dizziness and difficulty walking. He describes his dizziness as a spinning sensation of the room with associated nausea and vomiting. Which of the following findings suggests the vertigo is peripheral in origin?

tinnitus. ***tinnitus*** - The presence of **tinnitus**, along with **hearing loss** and **vertigo**, is highly suggestive of a peripheral cause of vertigo, such as **Meniere's disease** [1]. - Peripheral vertigo disorders often involve the **inner ear** structures, which are responsible for both balance and hearing [1]. *optic neuritis* - **Optic neuritis** is an **inflammation of the optic nerve** and is a neurological symptom typically associated with **central nervous system disorders**, such as **multiple sclerosis**. - It does not directly cause vertigo, although neurological conditions can present with balance disturbances. *bidirectional nystagmus* - **Bidirectional nystagmus** (nystagmus that changes direction) is a strong indicator of **central vertigo**, often caused by lesions in the brainstem or cerebellum [2]. - Peripheral nystagmus is typically **unidirectional** and horizontal or rotatory. *vertical nystagmus* - **Vertical nystagmus** (up-beating or down-beating) is almost always a sign of **central vertigo**, indicating damage to the brainstem or cerebellum [2]. - Peripheral vestibular lesions typically cause **horizontal or torsional nystagmus**.

Q: Acronym "COWS" is used for?

Bithermal caloric test. ***Bithermal caloric test*** - The acronym **COWS** stands for **C**old **O**pposite, **W**arm **S**ame, a mnemonic used to remember the direction of **nystagmus** induced during the **bithermal caloric test**. - This test assesses the function of the **horizontal semicircular canal** and its central connections by introducing warm or cold water into the ear canal. *Fistula test* - The fistula test is used to detect a **perilymph fistula** by observing nystagmus or vertigo in response to pressure changes in the external auditory canal. - It does not involve the COWS mnemonic or the caloric stimulation of the labyrinth. *Kobrak test* - The **Kobrak test** is a modified caloric test using ice water to elicit nystagmus, primarily performed when standard caloric testing yields no response. - While it is a type of caloric test, the COWS mnemonic is specifically associated with the results and interpretation of the **bithermal caloric test**. *Cold-air caloric test* - The **cold-air caloric test** uses cold air instead of water to stimulate the labyrinth, often preferred when water irrigation is contraindicated. - Although it is a caloric test, the **COWS mnemonic** is specifically developed for the **bithermal caloric test**'s interpretation where both warm and cold stimuli are compared for directional response.

Q: Dix-Hallpike maneuver is used to assess-

Vestibular function. ***Vestibular function*** - The Dix-Hallpike maneuver is a diagnostic test performed to identify **benign paroxysmal positional vertigo (BPPV)**. - It assesses the integrity of the **posterior semicircular canal** within the vestibular system by provoking nystagmus and vertigo. *Ear Ossicle continuity* - This is typically assessed through **tympanometry** and **audiometric testing**, not through a positional maneuver. - Problems with ossicular continuity lead to conductive hearing loss, not usually positional vertigo. *Cochlear function* - **Cochlear function** relates to hearing and is assessed using tests like **audiometry** and **otoacoustic emissions**. - The Dix-Hallpike maneuver does not evaluate the auditory function of the inner ear. *Brainstem function* - **Brainstem function** is evaluated by assessing cranial nerve reflexes, motor and sensory pathways, and level of consciousness. - While vestibular pathways involve the brainstem, the Dix-Hallpike specifically targets the **peripheral vestibular system** in the inner ear.

Q: Dix Hallpike maneuver is used to assess

Diagnose benign paroxysmal positional vertigo (BPPV). ***Diagnose benign paroxysmal positional vertigo (BPPV)*** - The **Dix-Hallpike maneuver** is the gold standard diagnostic test for **BPPV**, specifically posterior canal BPPV, the most common type of BPPV. - The test involves moving the patient from sitting to supine position with the head turned 45° and extended 20° below horizontal. - A **positive test** elicits characteristic **rotatory nystagmus** with a **latency of 1-5 seconds**, **duration <60 seconds**, and **fatigability** on repeated testing. - The nystagmus characteristics (latency, fatigability, direction) help distinguish **peripheral BPPV** from rare central positional vertigo. *Assess patency of Eustachian tube* - **Eustachian tube patency** is assessed using **Valsalva maneuver**, **Toynbee test**, or **tympanometry**, which measure pressure equalization in the middle ear. - The Dix-Hallpike maneuver involves head positioning to provoke vertigo, not middle ear pressure testing. *Differentiate cochlear and retrocochlear deafness* - **Cochlear vs retrocochlear deafness** differentiation requires audiological tests: **pure tone audiometry**, **speech discrimination**, **auditory brainstem response (ABR)**, and **otoacoustic emissions (OAEs)**. - The Dix-Hallpike maneuver tests the vestibular system (balance), not the cochlear system (hearing). *Assess neonatal hearing loss* - **Neonatal hearing screening** uses **automated otoacoustic emissions (OAEs)** and **automated auditory brainstem response (AABR)**. - The Dix-Hallpike maneuver is a positional vertigo test requiring patient cooperation and has no role in hearing assessment at any age.

Q: Caloric test assesses the function of

Lateral semicircular canal. ***Lateral semicircular canal*** - The **caloric test** specifically evaluates the function of the **lateral (horizontal) semicircular canal** and its associated neural pathways. - Introducing warm or cold water into the ear canal creates convection currents in the endolymph of the lateral semicircular canal, stimulating or inhibiting the hair cells. *Anterior semicircular canal* - The caloric test primarily affects the horizontal canal due to its anatomical position; it does not directly assess the **anterior semicircular canal**. - The anterior canal is mainly involved in sensing **rotational movements** of the head in the sagittal plane. *Superior semicircular canal* - The **superior semicircular canal** is another name for the anterior semicircular canal and is therefore not directly assessed by the caloric test. - It detects angular accelerations, particularly when the head is tilted forward or backward. *Posterior semicircular canal* - The caloric test has minimal to no direct impact on the **posterior semicircular canal**. - The posterior canal is involved in sensing rotational movements, particularly those in the coronal plane, like tilting the head to the shoulder.

Q: Cervical Vestibular Evoked Myogenic Potential (cVEMP) detects lesion of -

Inferior Vestibular Nerve. ***Inferior Vestibular Nerve*** - **cVEMP** primarily assesses the function of the **saccule** and its neural pathway via the **inferior vestibular nerve (IVN)**. - The saccule is sensitive to **vertical head movements and linear acceleration** and transmits signals through the IVN to the vestibulospinal pathway. - cVEMP is recorded from the **sternocleidomastoid muscle** and reflects the **vestibulocollic reflex**. *Cochlear Nerve* - The **cochlear nerve** is responsible for **auditory processing** and is assessed by tests like audiometry and ABR, not VEMPs. - While it's part of the vestibulocochlear nerve (CN VIII), its function is distinct from vestibular assessment. *Facial Nerve* - The **facial nerve (CN VII)** controls **facial muscles** and taste sensation, with no direct role in vestibular function. - Lesions are detected through facial movement assessment and electrophysiological tests like electroneuronography (ENoG). *Superior Vestibular Nerve* - The **superior vestibular nerve (SVN)** primarily innervates the **anterior and horizontal semicircular canals** and the **utricle**. - Its function is assessed by **oVEMP (ocular VEMP)**, **caloric reflex test**, or **head impulse test**, rather than cVEMP.

Q: Which of the following is the MOST common feature of superior canal dehiscence?

Positive Tullio's phenomenon. ***Positive Tullio's phenomenon*** - **Tullio's phenomenon** refers to **sound-induced disequilibrium** or nystagmus, which is a hallmark feature of superior canal dehiscence due to the open third window allowing sound to inappropriately stimulate the vestibular system. - This condition creates a **pressure-sensitive inner ear**, leading to vertigo, oscillopsia, and nystagmus triggered by loud sounds. *Positive Hennebert's sign* - **Hennebert's sign** indicates **nystagmus induced by pressure changes** in the external ear canal, often associated with Meniere's disease, but less specific for superior canal dehiscence. - While pressure sensitivity can occur, **sound-related symptoms (Tullio's phenomenon)** are more characteristic and common in superior canal dehiscence. *Oscillopsia* - **Oscillopsia**, the illusion of environmental motion, is a common symptom in superior canal dehiscence but is **not the most specific or defining feature** when compared to Tullio's phenomenon. - It results from **vestibulo-ocular reflex dysfunction** and can be caused by various vestibular disorders, not exclusively related to sound. *Positive Dix-Hallpike maneuver* - The **Dix-Hallpike maneuver** is used to diagnose **benign paroxysmal positional vertigo (BPPV)**, which is characterized by vertigo triggered by specific head positions due to otoconia dislodgement. - This maneuver is not typically positive or relevant for diagnosing **superior canal dehiscence**, where symptoms are more often sound or pressure-induced.

Q: At what angle is the caloric test done?

30°. ***30°*** - Positioning the head at **30 degrees** ensures the **horizontal semicircular canal** is in the vertical plane, making it most sensitive to thermal stimulation. - This orientation maximizes the **convection currents** within the endolymph, leading to a robust nystagmic response. *15°* - This angle does not optimally orient the **horizontal semicircular canal** for caloric testing, resulting in a less pronounced nystagmic response. - It would not efficiently induce the desired **endolymphatic movement** for evaluating vestibular function. *60°* - Positioning the head at **60 degrees** would place the horizontal semicircular canal at an angle that reduces its sensitivity to temperature changes. - This orientation would make the caloric test less effective in eliciting a clear and measurable **nystagmus**. *45°* - An angle of **45 degrees** would also not optimally align the **horizontal semicircular canal**, leading to a suboptimal caloric response. - It would not provide the best conditions for assessing the **vestibular system's reactivity** to thermal stimuli.

Q: All are characteristic features of superior semicircular canal dehiscence except?

SNHL. ***SNHL*** - **Superior semicircular canal dehiscence (SSCD)** typically presents with conductive hearing loss or mixed hearing loss, not sensorineural hearing loss (**SNHL**), due to the "third window" effect. - The dehiscence allows sound energy to escape, primarily affecting sound transmission to the cochlea and ossicular chain mechanics, mimicking a **conductive hearing loss**. *Tullio's phenomenon* - This is a classic symptom of **SSCD**, characterized by **vertigo** and **nystagmus** induced by loud noises. - The dehiscence causes abnormal pressure changes in the inner ear in response to sound, stimulating the vestibular system. *Third window phenomenon* - The dehiscence itself creates an abnormal "third window" in the inner ear, altering the normal fluid dynamics. - This phenomenon is central to the pathophysiology of **SSCD**, causing symptoms like **autophony** and **pulsatile tinnitus**. *Abnormal vestibular evoked myogenic potentials* - **Vestibular evoked myogenic potentials (VEMPs)**, particularly **cervical VEMPs (cVEMPs)** and **ocular VEMPs (oVEMPs)**, are characteristic findings in **SSCD**. - They show **abnormally low thresholds** and **increased amplitudes** in response to sound or vibration due to the altered inner ear mechanics from the dehiscence.

Question 1

All of the following are seen in Meniere's Disease except:

Accepted Answer

Ear Pain

Answer

Fullness of ear

Answer

Vertigo

Answer

Tinnitus

Question 2

A 47-year-old man presents to the emergency room with symptoms of dizziness and difficulty walking. He describes his dizziness as a spinning sensation of the room with associated nausea and vomiting. Which of the following findings suggests the vertigo is peripheral in origin?

Accepted Answer

tinnitus

Answer

optic neuritis

Answer

bidirectional nystagmus

Answer

vertical nystagmus

Question 3

Acronym "COWS" is used for?

Accepted Answer

Bithermal caloric test

Answer

Fistula test

Answer

Kobrak test

Answer

Cold-air caloric test

Question 4

Dix-Hallpike maneuver is used to assess-

Accepted Answer

Vestibular function

Answer

Ear Ossicle continuity

Answer

Cochlear function

Answer

Brainstem function

Question 5

Dix Hallpike maneuver is used to assess

Accepted Answer

Diagnose benign paroxysmal positional vertigo (BPPV)

Answer

Assess patency of Eustachian tube

Answer

Differentiate cochlear and retrocochlear deafness

Answer

Assess neonatal hearing loss

Question 6

Caloric test assesses the function of

Accepted Answer

Lateral semicircular canal

Answer

Anterior semicircular canal

Answer

Superior semicircular canal

Answer

Posterior semicircular canal

Question 7

Cervical Vestibular Evoked Myogenic Potential (cVEMP) detects lesion of -

Accepted Answer

Inferior Vestibular Nerve

Answer

Cochlear Nerve

Answer

Facial Nerve

Answer

Superior Vestibular Nerve

Question 8

Which of the following is the MOST common feature of superior canal dehiscence?

Accepted Answer

Positive Tullio's phenomenon

Answer

Positive Hennebert's sign

Answer

Oscillopsia

Answer

Positive Dix-Hallpike maneuver

Question 9

At what angle is the caloric test done?

Accepted Answer

30°

Answer

15°

Answer

60°

Answer

45°

Question 10

All are characteristic features of superior semicircular canal dehiscence except?

Accepted Answer

SNHL

Answer

Tullio's phenomenon

Answer

Third window phenomenon

Answer

Abnormal vestibular evoked myogenic potentials

Vestibular Disorders — MCQs

Vestibular Disorders — MCQs

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