Vestibular Disorders Practice Questions

Q: What is the condition characterized by an abnormal accumulation of endolymph fluid in the inner ear, leading to symptoms such as vertigo, tinnitus, and hearing loss?

Meniere's disease. ***Meniere's disease*** - This condition is precisely defined by the **triad of symptoms**: episodic **vertigo**, **tinnitus**, and fluctuating sensorineural **hearing loss**, all resulting from **endolymphatic hydrops** (abnormal accumulation of endolymph in the inner ear). - The excess fluid in the **membranous labyrinth** disrupts the normal function of the vestibular and cochlear systems. *Monoaural Diplacusis* - This refers to a phenomenon where an individual perceives a single sound as having a **different pitch or timbre** in the same ear, often a symptom rather than a disease itself. - It does not involve the characteristic triad of vertigo, tinnitus, and hearing loss caused by endolymphatic hydrops. *Lermoyez Syndrome* - This is a rare variant of Meniere's disease where **hearing loss and tinnitus precede** and gradually worsen before an episode of vertigo, with hearing often improving after the vertigo attack. - While related to endolymphatic hydrops, the **temporal sequence** of symptoms is distinct from classic Meniere's disease. *Otosclerosis* - This is a condition involving abnormal bone growth in the **middle ear**, specifically around the **stapes bone**, leading to **conductive hearing loss**. - While it causes hearing loss, it is not characterized by endolymphatic hydrops, vertigo, or tinnitus as primary symptoms, unlike Meniere's disease.

Q: What does the acronym 'COWS' refer to in the context of vestibular testing?

Caloric test. ***Caloric test*** - 'COWS' stands for **C**old **O**pposite, **W**arm **S**ame, describing the direction of **nystagmus** relative to the ear being irrigated in a **caloric test**. - This mnemonic is used in **vestibular function testing** to evaluate the integrity of the horizontal semicircular canal and its central connections. *Romberg test* - The Romberg test assesses **proprioception** and **vestibular function** by observing a patient's sway with eyes open and closed. - It does not involve the 'COWS' mnemonic, which is specific to **caloric stimulation**. *Fistula test* - The fistula test is used to detect an abnormal connection between the **middle ear** and the **inner ear**, often caused by a cholesteatoma or trauma. - It involves applying pressure changes to the external ear canal and observing for **nystagmus** or **vertigo**, but it is not associated with 'COWS'. *Hallpike positional test* - Also known as the Dix-Hallpike maneuver, this test is used to diagnose **Benign Paroxysmal Positional Vertigo (BPPV)**. - It involves specific head and body movements to provoke **vertigo** and **nystagmus** by dislodging otoconia in the semicircular canals, and does not use the 'COWS' acronym.

Q: Which of the following is the MOST accurate definition of vertigo?

Sensation of spinning or whirling. ***Correct: Sensation of spinning or whirling*** - Vertigo is medically defined as an **illusion of movement**, typically a sensation that the patient or their surroundings are spinning, rotating, or whirling. - This is the **hallmark feature** that distinguishes vertigo from other forms of dizziness according to **Harrison's Principles** and standard ENT textbooks. - The **vestibular system** provides spatial orientation, and when disrupted (as in **BPPV, Meniere's disease, vestibular neuritis**), it creates this false perception of rotational movement. - The spinning sensation can be subjective (patient feels they are moving) or objective (environment appears to move). *Incorrect: Subjective sense of imbalance* - This describes **disequilibrium** or nonspecific dizziness, NOT vertigo specifically. - Imbalance without rotational sensation suggests different pathologies like **cerebellar dysfunction, proprioceptive loss**, or multisensory deficit. - While vertigo can cause secondary imbalance, the **defining feature** is the illusory movement, not just imbalance alone. *Incorrect: Sense of pressure in the ear* - Aural fullness or ear pressure is an **associated symptom** in conditions like **Meniere's disease** or **eustachian tube dysfunction**. - This is not the definition of vertigo but rather a **concurrent symptom** that may accompany vestibular disorders. *Incorrect: Infection of the inner ear* - Inner ear infections like **labyrinthitis** or **vestibular neuritis** are **etiologies** (causes) that can produce vertigo. - An infection is a pathological process, not the definition of the symptom itself—many non-infectious causes also produce vertigo.

Q: Which of the following is the most common morbidity associated with Meniere's disease?

Permanent hearing loss. ***Permanent hearing loss*** - **Meniere's disease** is characterized by episodes of **vertigo**, **tinnitus**, ear fullness, and fluctuating hearing loss, which often progresses to permanent hearing loss over time. - The recurrent episodes of **endolymphatic hydrops** cause cumulative damage to the **cochlea** and **vestibular apparatus**, leading to irreversible sensorineural hearing loss. *Chronic otitis media* - This is an **infection** and **inflammation of the middle ear**, typically leading to tympanic membrane perforation or cholesteatoma. - It is distinct from Meniere's disease, which is a disorder of the **inner ear** with no direct pathological link to middle ear infections. *Chronic otitis externa* - This condition involves **inflammation of the external ear canal** and is usually caused by bacterial or fungal infections. - It is an outer ear condition and bears no etiological or symptomatic relationship to the inner ear pathology of Meniere's disease. *Secondary development of a craniopharyngioma* - A **craniopharyngioma** is a benign brain tumor arising from Rathke's pouch cells, typically located near the **pituitary gland**. - There is no known direct association or increased risk of developing a craniopharyngioma in patients with Meniere's disease.

Q: A 65-year-old woman complains of recurrent episodes of sudden-onset dizziness and nausea. She notices an abrupt onset of a spinning sensation when rolling over or sitting up in bed. The symptoms last for 30 seconds and then completely resolve. She has no hearing change or other neurologic symptoms, and her physical examination is completely normal. A Dix-Hallpike maneuver reproduces her symptoms. Which of the following findings on vestibular testing favors the diagnosis of benign paroxysmal positional vertigo (BPPV) over central positional vertigo?

habituation occurs. The phenomenon of **habituation**, where symptoms lessen with repeated positional changes, is characteristic of **BPPV** due to canalith dissolution or movement away from the cupula. In central positional vertigo, habituation typically does not occur, and the nystagmus may be persistent. **BPPV** typically presents with a **latency period** of a few seconds (usually 2-20 seconds) between the provocative maneuver and the onset of nystagmus and vertigo. The absence of a latency period is a characteristic more consistent with **central positional vertigo**. The severity of vertigo (moderate vs. severe) is not a reliable differentiating factor between BPPV and central positional vertigo, as both can cause significant discomfort. While BPPV often causes **severe vertigo with nystagmus**, central causes can also present with varying intensities of dizziness. **Fatigability**, meaning the nystagmus and vertigo decrease in intensity with repeated maneuvers, is a hallmark of **BPPV**. The **absence of fatigability** suggests a central cause, where nystagmus often persists or even increases with repeated testing.

Q: Third window effect is seen in:

Dehiscent superior semicircular canal. ***Dehiscent superior semicircular canal*** - A dehiscent superior semicircular canal creates an **abnormal opening** or "third window" between the inner ear space and the cranial cavity. - This **third window** disrupts the normal inner ear fluid dynamics, leading to symptoms like **sound-induced or pressure-induced vertigo**, autophony, and conductive hearing loss. *Perforated tympanum* - A perforated tympanum (eardrum) primarily affects the **middle ear function** and conductive hearing. - It does not create a "third window" effect within the **inner ear fluid system**. *Round window* - The round window is a normal anatomical structure that functions as a relief valve for **inner ear pressure changes** during sound transmission. - It is an **integral part of the two-window system** of the inner ear, not an abnormal third window. *Oval window* - The oval window is a normal anatomical structure where the **stapes footplate transmits sound vibrations** into the cochlea. - It is a **primary component of the normal inner ear mechanics** and not associated with the "third window effect."

Question 1

What is the condition characterized by an abnormal accumulation of endolymph fluid in the inner ear, leading to symptoms such as vertigo, tinnitus, and hearing loss?

Accepted Answer

Meniere's disease

Answer

Monoaural Diplacusis

Answer

Lermoyez Syndrome

Answer

Otosclerosis

Question 2

What does the acronym 'COWS' refer to in the context of vestibular testing?

Accepted Answer

Caloric test

Answer

Romberg test

Answer

Fistula test

Answer

Hallpike positional test

Question 3

Which of the following is the MOST accurate definition of vertigo?

Accepted Answer

Sensation of spinning or whirling

Answer

Sense of pressure in the ear

Answer

Infection of the inner ear

Answer

Subjective sense of imbalance

Question 4

Which of the following is the most common morbidity associated with Meniere's disease?

Accepted Answer

Permanent hearing loss

Answer

Secondary development of a craniopharyngioma

Answer

Chronic otitis media

Answer

Chronic otitis externa

Question 5

A 65-year-old woman complains of recurrent episodes of sudden-onset dizziness and nausea. She notices an abrupt onset of a spinning sensation when rolling over or sitting up in bed. The symptoms last for 30 seconds and then completely resolve. She has no hearing change or other neurologic symptoms, and her physical examination is completely normal. A Dix-Hallpike maneuver reproduces her symptoms. Which of the following findings on vestibular testing favors the diagnosis of benign paroxysmal positional vertigo (BPPV) over central positional vertigo?

Accepted Answer

habituation occurs

Answer

absence of a latency period

Answer

moderate vertigo

Answer

absence of fatigability

Question 6

Third window effect is seen in:

Accepted Answer

Dehiscent superior semicircular canal

Answer

Perforated tympanum

Answer

Round window

Answer

Oval window

Vestibular Disorders — MCQs

Vestibular Disorders — MCQs

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