Diseases of the Ear Practice Questions

Q: A 60M diabetic presents with severe ear pain, otorrhea, and facial nerve palsy. CT reveals bony erosion of the temporal bone. His glucose level is 350 mg/dL. Most appropriate management?

Intravenous antibiotics and surgical debridement. ***Intravenous antibiotics and surgical debridement*** - The patient presents with **Malignant Otitis Externa**, a life-threatening infection typically caused by **Pseudomonas aeruginosa** in elderly **diabetic** patients. - Management requires long-term **parenteral antipseudomonal antibiotics** and **surgical debridement** when there is extensive necrotic bone or failure of medical therapy. *Oral steroids* - Steroids are **contraindicated** in this setting as they can exacerbate **hyperglycemia** and impair the immune response necessary to fight the necrotizing infection. - They do not address the underlying **Pseudomonas** infection which is the primary cause of the **facial nerve palsy**. *Antifungal therapy* - **Malignant Otitis Externa** is overwhelmingly bacterial in origin (Pseudomonas), making antifungals ineffective as a primary treatment. - Fungal etiologies (like Aspergillus) are rare and usually reserved for cases that fail to respond to standard **antipseudomonal agents**. *Topical antibiotics* - **Topical antibiotics** are the mainstay for simple otitis externa but are insufficient for **malignant** forms with **cranial nerve involvement** and **bony erosion**. - Systemic delivery is mandatory to achieve therapeutic concentrations in the **temporal bone** and surrounding soft tissues.

Q: Which of the following is the LEAST likely risk factor for developing acute otitis externa?

Presbycusis. ***Presbycusis*** - **Presbycusis** is age-related sensorineural hearing loss affecting the **inner ear (cochlea)** and auditory nerve pathways - It is a **degenerative condition** with NO involvement of the external auditory canal - There is **no pathophysiological mechanism** linking presbycusis to acute otitis externa, as it does not affect the ear canal's skin barrier, moisture balance, or susceptibility to infection - This is the **LEAST likely** risk factor among the options *Frequent swimming* - **Major risk factor** for acute otitis externa ("swimmer's ear") - Water exposure washes away protective **cerumen** and increases canal pH - Creates a **moist environment** ideal for bacterial proliferation, especially ***Pseudomonas aeruginosa*** and *Staphylococcus aureus* - Maceration of canal skin compromises the natural barrier *Use of hearing aids* - **Well-documented risk factor** for otitis externa - Hearing aids **occlude the ear canal**, trapping moisture and debris - Can cause **mechanical trauma** to the delicate canal skin - Creates a warm, humid environment promoting bacterial and fungal growth - Regular users are at increased risk, especially with poor hygiene *Tympanic membrane perforation* - While primarily associated with **chronic otitis media**, a perforation can predispose to external canal complications - May allow **moisture entry** and middle ear drainage into the canal - However, the direct risk for acute otitis externa is less significant compared to factors that directly affect the external canal environment - Still more relevant than presbycusis, which has no connection to the external ear

Q: Eustachian tube function is best assessed by:

Tympanometry. ***Tympanometry*** - **Tympanometry** directly measures the compliance of the **tympanic membrane** in response to changes in air pressure, which is influenced by the pressure in the middle ear and thus **Eustachian tube function**. - Abnormal tympanometry patterns, such as **Type B (flat)** or **Type C (negative pressure)**, can indicate **Eustachian tube dysfunction** by reflecting issues with middle ear ventilation. *VEMP* - **Vestibular Evoked Myogenic Potentials (VEMPs)** assess **saccular** and **utricular function** and the **vestibular nerve pathways**, not directly Eustachian tube function. - VEMPs are used to evaluate conditions like **Meniere's disease** or **superior canal dehiscence**, which are unrelated to Eustachian tube patency. *Rhinomanometry* - **Rhinomanometry** measures **nasal airflow** and **nasal resistance** to airflow, primarily used to assess **nasal patency** in conditions like rhinitis or septal deviation. - It does not provide information about the pressure equalization or ventilatory function of the **Eustachian tube**. *Politzer test* - The **Politzer test** is an older, less precise method for assessing **Eustachian tube patency**, involving insufflation of air into one nostril while the patient swallows. - While it can indicate whether the tube opens, it is **subjective** and does not provide the quantitative, objective data that **tympanometry** offers regarding middle ear mechanics.

Q: A 45-year-old man presents with sudden, severe ear pain and bloody otorrhea following a barotrauma event. What is the most likely diagnosis?

Tympanic membrane perforation. ***Correct: Tympanic membrane perforation*** - **Barotrauma** is a direct cause of tympanic membrane perforation, and **sudden, severe ear pain** followed by **bloody otorrhea** is highly characteristic of this event. - The sudden relief of pressure after perforation often leads to a decrease in the initial intense pain while introducing bleeding from the torn membrane. *Incorrect: Otitis externa* - This condition involves inflammation of the **external ear canal**, typically presenting with pain, itching, and discharge, but is generally not associated with acute trauma or bloody otorrhea directly from the middle ear. - While otitis externa can cause pain, it usually results from infection or irritation and does not typically involve the sudden, severe pain and bloody discharge related to a barotraumatic event. *Incorrect: Acute otitis media* - **Acute otitis media** is an infection of the middle ear, usually presenting with ear pain, fever, and a bulging tympanic membrane, often without trauma. - Bloody otorrhea due to AOM would typically indicate rupture of an infected eardrum, but the direct antecedent of **barotrauma** makes perforation the primary diagnosis. *Incorrect: Cholesteatoma* - A **cholesteatoma** is an abnormal, noncancerous skin-growth in the middle ear, behind the eardrum, that typically develops over time and causes gradual hearing loss and chronic ear discharge (often foul-smelling), not an acute presentation following barotrauma. - It results from chronic Eustachian tube dysfunction or previous perforations and does not manifest with sudden, severe pain and bloody otorrhea from an acute single event.

Q: What are the typical X-ray findings in chronic otitis media?

Sclerosis with cavity in mastoid. ***Sclerosis with cavity in mastoid*** - **Sclerosis** of the mastoid bone and the presence of a **cavity** are classic radiological signs of chronic otitis media, indicating long-standing inflammation and bone destruction. - This finding reflects the body's attempt to wall off the infection, leading to increased bone density and eventual resorption forming a cavity, such as a **mastoid antrum**. *Clear-cut distinct bony partitions between mastoid air cells* - This describes a **normal mastoid pneumatic system**, where air cells are clearly separated by thin bony septa, indicating an absence of chronic inflammatory processes. - In chronic otitis media, inflammation typically leads to the **destruction of these septa** and subsequent scarring or sclerosis. *Honeycombing of the mastoid* - While descriptive, "honeycombing" can be ambiguous and is not the most precise term for chronic otitis media; it's more commonly associated with the **destructive pattern seen with cholesteatoma**, an epidermal cyst-like growth. - Cholesteatoma, often a complication of chronic otitis media, erodes bone, creating irregular **cavities** and **bone loss**, which might be broadly described as honeycombing but is distinct from simple sclerosis. *None of the options* - This option is incorrect as **sclerosis with a cavity in the mastoid** is a well-recognized and typical X-ray finding for chronic otitis media.

Q: A 5-year-old child presents with fever, ear pain, and a bulging tympanic membrane. What is the most likely diagnosis?

Acute otitis media. ***Acute otitis media*** - **Fever**, **ear pain**, and a **bulging tympanic membrane** are classic signs of inflammation and fluid accumulation in the middle ear space, characteristic of acute otitis media. - This condition is common in children due to their developing **Eustachian tubes** and frequent upper respiratory infections. *Otitis externa* - This condition is an inflammation of the **outer ear canal**, often called **"swimmer's ear"**. - Typically presents with **pain upon touching the earlobe** or during tragal pressure, and usually does not cause a bulging tympanic membrane or significant fever unless severe. *Chronic otitis media* - This involves **persistent inflammation** of the middle ear, often with a **perforated tympanic membrane** and ear discharge, lasting for weeks or months. - It does not typically present with the acute, severe symptoms of fever and a bulging tympanic membrane seen in this case. *Eustachian tube dysfunction* - This condition involves impaired function of the **Eustachian tube**, leading to a feeling of **fullness or pressure in the ear** and sometimes hearing loss. - While it can predispose to otitis media, it does not directly cause the acute inflammatory signs of fever, severe pain, and a bulging tympanic membrane.

Q: Which of the following is a common complication of chronic suppurative otitis media?

Hearing loss. ***Hearing loss*** - Chronic suppurative otitis media (CSOM) most commonly leads to **conductive hearing loss** due to tympanic membrane perforation, ossicular chain erosion, or cholesteatoma formation. - **Sensorineural hearing loss** can occur with labyrinthine involvement or through toxic effects on the inner ear. - This is the **most frequent complication** of CSOM, occurring in the majority of cases. *Facial nerve palsy* - This is a **rare but serious** intratemporal complication of CSOM, occurring in less than 1% of cases. - Usually results from direct erosion of the fallopian canal by **cholesteatoma** or from severe infection. - Requires urgent surgical intervention when it occurs. *Meningitis* - This is an **uncommon intracranial complication** that occurs when infection spreads through bone erosion or via preformed pathways. - Other intracranial complications include brain abscess, lateral sinus thrombosis, and extradural abscess. - These are considered serious but rare complications requiring immediate treatment. *Mastoiditis* - **Chronic mastoiditis** is indeed a common complication of CSOM, occurring when infection involves the mastoid air cell system. - However, **hearing loss** remains more universally present and is therefore considered the most common complication. - Mastoiditis in CSOM often manifests as coalescent mastoiditis with bone destruction.

Q: In the context of acute otitis media, Weber's test will be:

Lateralized to the affected ear. ***Lateralized to the affected ear*** - **Weber's test** is used to detect **unilateral conductive or sensorineural hearing loss**. In acute otitis media, there is often fluid in the middle ear space, leading to **conductive hearing loss**. - With **conductive hearing loss**, bone conduction is perceived as louder in the affected ear because the masking effect of ambient noise transmitted via air conduction is reduced, causing the sound to be **lateralized to the affected (poorer) ear**. - This occurs because the affected ear with middle ear fluid has reduced air conduction, making the bone-conducted sound relatively more prominent in that ear. *Not lateralized* - This would imply either **no hearing loss** or **symmetrical hearing loss** (either conductive or sensorineural), which is not typical for unilateral acute otitis media. - A lack of lateralization suggests the sound is perceived equally in both ears, which is not the expected finding when one ear has significant middle ear pathology. *Lateralized to the better ear* - Lateralization to the **better ear** typically indicates **sensorineural hearing loss** in the poorer ear. - Acute otitis media primarily causes **conductive hearing loss** due to fluid accumulation in the middle ear, not sensorineural pathology. *Inconclusive* - Weber's test is generally a **reliable and conclusive test** for differentiating between unilateral conductive and sensorineural hearing loss. - If performed correctly, it should yield a clear lateralization or lack thereof, providing valuable diagnostic information in acute otitis media.

Question 1

A 60M diabetic presents with severe ear pain, otorrhea, and facial nerve palsy. CT reveals bony erosion of the temporal bone. His glucose level is 350 mg/dL. Most appropriate management?

Accepted Answer

Intravenous antibiotics and surgical debridement

Answer

Oral steroids

Answer

Antifungal therapy

Answer

Topical antibiotics

Question 2

Which of the following is the LEAST likely risk factor for developing acute otitis externa?

Accepted Answer

Presbycusis

Answer

Tympanic membrane perforation

Answer

Frequent swimming

Answer

Use of hearing aids

Question 3

Eustachian tube function is best assessed by:

Accepted Answer

Tympanometry

Answer

VEMP

Answer

Rhinomanometry

Answer

Politzer test

Question 4

A 45-year-old man presents with sudden, severe ear pain and bloody otorrhea following a barotrauma event. What is the most likely diagnosis?

Accepted Answer

Tympanic membrane perforation

Answer

Otitis externa

Answer

Acute otitis media

Answer

Cholesteatoma

Question 5

What are the typical X-ray findings in chronic otitis media?

Accepted Answer

Sclerosis with cavity in mastoid

Answer

Honeycombing of the mastoid

Answer

None of the options

Answer

Clear-cut distinct bony partitions between mastoid air cells

Question 6

A 5-year-old child presents with fever, ear pain, and a bulging tympanic membrane. What is the most likely diagnosis?

Accepted Answer

Acute otitis media

Answer

Otitis externa

Answer

Chronic otitis media

Answer

Eustachian tube dysfunction

Question 7

Which of the following is a common complication of chronic suppurative otitis media?

Accepted Answer

Hearing loss

Answer

Meningitis

Answer

Facial nerve palsy

Answer

Mastoiditis

Question 8

A tympanogram reveals a Type B curve in a patient with a history of recurrent otitis media. What does this finding indicate, and what is the appropriate management?

Accepted Answer

Indicates middle ear effusion; consider myringotomy with tube placement

Answer

Indicates Eustachian tube dysfunction; prescribe decongestants

Answer

Indicates ossicular chain discontinuity; refer for surgical consultation

Answer

Indicates normal middle ear function; no treatment needed

Question 9

A 2-year-old male with recurrent otitis media presents for the fourth episode this year. There is no hearing loss. On physical examination, the tympanic membrane is erythematous and bulging, with no perforation. The middle ear effusion persists after antibiotic treatment. Analyze the situation and recommend the next step.

Accepted Answer

Tympanostomy tube insertion

Answer

Watchful waiting for 3 months

Answer

Corticosteroid ear drops

Answer

Switch to broad-spectrum antibiotics

Question 10

In the context of acute otitis media, Weber's test will be:

Accepted Answer

Lateralized to the affected ear

Answer

Not lateralized

Answer

Lateralized to the better ear

Answer

Inconclusive

Diseases of the Ear — MCQs

Diseases of the Ear — MCQs

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