Otology

Otology Indian Medical PG Question 1: Most common bone affected by otosclerosis?

• A. Stapes (Correct Answer)
• B. Bony labyrinth
• C. Mastoid process
• D. Incus

Otology Explanation: ***Stapes*** - **Otosclerosis** is characterized by abnormal bone remodeling in the otic capsule, primarily affecting the **stapes footplate**. - This leads to its fixation in the oval window, causing **conductive hearing loss**. - The **stapediovestibular joint** is the most common site, occurring in over 90% of cases. *Bony labyrinth* - While otosclerosis originates in the **otic capsule** (which forms the bony labyrinth), the term refers to a broader anatomical structure. - The specific site of clinical significance is the **stapes footplate**, not the labyrinth as a whole. *Mastoid process* - The **mastoid process** is part of the temporal bone but is structurally distinct from the middle ear and otic capsule. - It is not involved in otosclerosis pathology. *Incus* - While the **incus** is a middle ear ossicle, it is rarely affected by otosclerosis. - The disease process specifically targets the **stapes footplate** at the oval window, not other ossicles.

Otology Indian Medical PG Question 2: Fenestration operation is which type of tympanoplasty?

• A. Type-3
• B. Type-2
• C. Type-4
• D. Type-5 (Correct Answer)

Otology Explanation: ***Type-5*** - **Fenestration operation** is classified as **Type V tympanoplasty** in Wullstein's classification. - This procedure creates a **new fenestra (window) in the lateral semicircular canal** to bypass a fixed oval window/stapes in cases of **otosclerosis**. - Sound waves are directed to this new window, bypassing the immobile stapes footplate. - Historically important procedure before **stapedectomy** became the standard treatment for otosclerosis. *Type-2* - **Type II tympanoplasty** involves repair with a **partially eroded malleus** where the graft is placed onto the **incus or remaining malleus**. - Requires an intact and mobile stapes, unlike fenestration which bypasses a fixed stapes. - Used for tympanic membrane perforations with minor ossicular damage. *Type-3* - **Type III tympanoplasty** involves placing the graft directly onto the **stapes head** (columella effect). - Performed when malleus and incus are eroded but stapes is intact and mobile. - This is **myringostapediopexy**, not fenestration. *Type-4* - **Type IV tympanoplasty** involves creating a **small middle ear cavity** with the graft placed over the **round window**. - Used when the stapes arch is absent but the footplate is mobile. - Different from fenestration as it utilizes the round window, not a semicircular canal fenestra.

Otology Indian Medical PG Question 3: A female patient aged 30 years with bilateral conductive deafness is wearing a hearing aid. What is the probable diagnosis?

• A. Otosclerosis (Correct Answer)
• B. Presbycusis
• C. Chronic suppurative otitis media
• D. Meniere’s disease

Otology Explanation: ***Otosclerosis*** - **Otosclerosis** is a common cause of **conductive hearing loss** in young to middle-aged adults, often presenting bilaterally. - It involves abnormal bone remodeling in the **otic capsule**, primarily affecting the **stapes footplate**, which leads to fixation and impaired sound transmission. *Presbycusis* - **Presbycusis** is an **age-related sensorineural hearing loss** that typically affects older individuals, not a 30-year-old. - It is characterized by difficulty hearing high-frequency sounds, not conductive hearing loss. *Chronic suppurative otitis media* - **Chronic suppurative otitis media (CSOM)** involves a **perforated tympanic membrane** with chronic discharge and hearing loss. - While it causes conductive hearing loss, it is typically associated with a history of recurrent infections and ear discharge, which are not mentioned here. *Meniere's disease* - **Meniere's disease** is characterized by episodic **vertigo**, **tinnitus**, **fluctuating sensorineural hearing loss**, and aural fullness. - It causes sensorineural, not conductive, hearing loss and is associated with additional symptoms absent in this case.

Otology Indian Medical PG Question 4: What is the classification of intelligence corresponding to an IQ score of 90-109?

• A. Below average
• B. Average (Correct Answer)
• C. Slightly below average
• D. Above average

Otology Explanation: ***Average*** - An **IQ score** range of **90-109** is traditionally classified as **Average** intelligence. - This range represents the **mean** and surrounding **standard deviation** of IQ scores in the general population. *Below average* - This classification usually corresponds to IQ scores in the range of **70-79** or **80-89**, depending on the specific scale. - It does not represent the central tendency of the population's intelligence. *Slightly below average* - This category typically corresponds to IQ scores in the range of **80-89**. - It falls just below the average range but is not as low as the "below average" classification. *Above average* - This classification is typically assigned to IQ scores that are in the range of **110-119** or higher. - It signifies cognitive abilities that are greater than the majority of the population.

Otology Indian Medical PG Question 5: Calcified canal is explored with all of the given instruments except:

• A. 10 K file (Correct Answer)
• B. 6 K file
• C. C+ file
• D. Profinder

Otology Explanation: ***10 K file*** - **#10 K-files** are typically used for initial negotiation of **larger, more accessible canals**, not for exploring highly calcified or severely constricted canals. - Their larger diameter (0.10 mm) makes them too stiff and prone to ledge formation or perforation in extremely calcified areas. *6 K file* - **#6 K-files** are extremely small and flexible (0.06 mm in diameter), making them ideal for initial penetration through tight, calcified canal orifices. - Their fine tip and flexibility help in navigating complex anatomy and overcoming initial resistance without causing iatrogenic damage. *C+ file* - **C+ files** are specifically designed for calcified or severely curved canals due to their **stiffer shaft, non-cutting tip**, and improved resistance to buckling. - They are offered in multiple diameters, including very small sizes like 06 and 08, which are suitable for initial exploration of challenging canal anatomy. *Profinder* - **ProFinder files** are specialized stainless steel hand files with a **triangular cross-section** and non-cutting tip, designed for initial negotiation of difficult and calcified canals. - Their enhanced tip design and shaft stiffness facilitate easy insertion into tight orifices and help maintain the canal pathway.

Otology Indian Medical PG Question 6: What is the primary purpose of the Bing test in audiology?

• A. Assessing overall hearing ability through audiometry
• B. Evaluating sound conduction through air
• C. A general term for various hearing assessments
• D. Determining the effect of ear canal occlusion on sound conduction (Correct Answer)

Otology Explanation: ***Determining the effect of ear canal occlusion on sound conduction*** - The Bing test specifically assesses how **occluding the ear canal** (using a finger or probe) affects the perception of **bone-conducted sound** from a tuning fork placed on the mastoid. - This test evaluates the **occlusion effect**, which is the increase in loudness of bone-conducted sound when the ear canal is occluded. - In **normal hearing** or **sensorineural hearing loss**, occluding the ear canal makes the bone-conducted sound louder (positive Bing test). - In **conductive hearing loss**, there is no change or the sound becomes softer (negative Bing test), as the conductive pathology already creates an occlusion-like effect. - This helps differentiate between **conductive** and **sensorineural hearing loss**. *Assessing overall hearing ability through audiometry* - **Audiometry** is a broad term encompassing various tests to quantify hearing sensitivity across different frequencies. - While the Bing test is part of audiological assessment, its primary purpose is not to determine overall hearing ability but rather to assess the occlusion effect. *Evaluating sound conduction through air* - Tests like **air conduction audiometry** directly evaluate the transmission of sound through the outer and middle ear via air. - The Bing test primarily focuses on **bone conduction** using a tuning fork on the mastoid, not air conduction. *A general term for various hearing assessments* - This statement describes a category of tests rather than the specific function of the Bing test. - The Bing test is a **specific diagnostic tuning fork test** with a defined purpose, not a general umbrella term.

Otology Indian Medical PG Question 7: A 5-year-old child presents with reduced hearing for the past 2-3 months. Based on the otoscopy findings shown, what is the most likely diagnosis?

• A. Myringitis
• B. Otitis media with effusion (Correct Answer)
• C. Acute ear infection
• D. Air in the middle ear

Otology Explanation: ***Otitis media with effusion*** - The image clearly shows the presence of **bubbles behind the tympanic membrane**, indicating fluid accumulation in the middle ear. - This fluid leads to **reduced hearing**, as reported in the 5-year-old child, consistent with otitis media with effusion (OME), also known as "glue ear." *Myringitis* - Myringitis typically presents with **inflammation of the tympanic membrane**, often with vesicles or bullae on the drum, which are not visible here. - While it can cause pain, it does not typically show the characteristic bubbles signifying middle ear effusion. *Acute ear infection* - An **acute otitis media** would show a **bulging, erythematous (red), and opaque tympanic membrane** due to inflammation and pus, which is not consistent with the image. - Systemic symptoms like fever and severe ear pain would also be expected with an acute infection. *Air in the middle ear* - The presence of **air in the middle ear is normal** and indicates a healthy, functioning Eustachian tube. - The visible bubbles in the image are consistent with **fluid and air-fluid levels**, not just air, and indicate a pathological condition affecting hearing.

Otology Indian Medical PG Question 8: The following test is useful for diagnosis of all except:

• A. Ossicular discontinuity
• B. Otosclerosis
• C. Serous otitis media
• D. Postmeningitis deafness (Correct Answer)

Otology Explanation: ***Postmeningitis deafness*** - The image illustrates a **tympanometer**, which primarily assesses the function of the **middle ear** and **eardrum mobility** within the context of air pressure changes. - **Postmeningitis deafness** typically results from **sensorineural hearing loss** due to damage to the **cochlea** or **auditory nerve**, which is a condition of the inner ear and cannot be directly diagnosed by tympanometry. *Ossicular discontinuity* - This condition involves a break or separation in the **ossicular chain**, leading to excessive mobility of the tympanic membrane. - Tympanometry in **ossicular discontinuity** typically shows a **Type Ad tympanogram**, characterized by abnormally high compliance due to the lack of resistance from the damaged ossicles. *Otosclerosis* - **Otosclerosis** involves abnormal bone growth around the **stapes** footplate, leading to its fixation and reduced mobility. - Tympanometry in otosclerosis typically yields a **Type As tympanogram**, indicating abnormally low compliance or a shallow peak. *Serous otitis media* - Also known as **otitis media with effusion**, this condition involves the accumulation of fluid in the middle ear without signs of acute infection. - Tympanometry in **serous otitis media** typically presents with a **Type B tympanogram**, characterized by a flat curve due to reduced or absent eardrum mobility caused by the fluid.

Otology Indian Medical PG Question 9: A 72-year-old man presents to his primary care physician with progressively worsening hearing loss. He states that his trouble with hearing began approximately 7-8 years ago. He is able to hear when someone is speaking to him; however, he has difficulty with understanding what is being said, especially when there is background noise. In addition to his current symptoms, he reports a steady ringing in both ears, and at times experiences dizziness. Medical history is significant for three prior episodes of acute otitis media. Family history is notable for his father being diagnosed with cholesteatoma. His temperature is 98.6°F (37°C), blood pressure is 138/88 mmHg, pulse is 74/min, and respirations are 13/min. On physical exam, when a tuning fork is placed in the middle of the patient's forehead, sound is appreciated equally on both ears. When a tuning fork is placed by the external auditory canal and subsequently on the mastoid process, air conduction is greater than bone conduction. Which of the following is most likely the cause of this patient's symptoms?

• A. Stapedial abnormal bone growth
• B. Endolymphatic hydrops
• C. Cochlear hair cell degeneration (Correct Answer)
• D. Accumulation of desquamated keratin debris

Otology Explanation: ***Cochlear hair cell degeneration*** - The patient's **progressive, bilateral hearing loss** over several years, difficulty understanding speech in noise, and **tinnitus** are classic symptoms of **presbycusis**, which results from age-related **degeneration of cochlear hair cells**. - The **normal Weber test** (no lateralization) and **Rinne test** (air conduction > bone conduction) indicate a **sensorineural hearing loss**, consistent with cochlear pathology rather than conductive issues. *Stapedial abnormal bone growth* - This condition (**otosclerosis**) causes **conductive hearing loss** due to fixation of the stapes, which would present with an **abnormal Rinne test** (bone conduction > air conduction) in the affected ear. - While it can cause progressive hearing loss and tinnitus, the normal Rinne test contradicts this diagnosis. *Endolymphatic hydrops* - This is the underlying pathology of **Ménière's disease**, which typically presents with episodic vertigo, fluctuating sensorineural hearing loss, tinnitus, and aural fullness. - The patient's dizziness is non-episodic, and the absence of fluctuating hearing loss and aural fullness makes Ménière's less likely. *Accumulation of desquamated keratin debris* - This describes a **cholesteatoma**, which typically causes **conductive hearing loss** and often presents with otorrhea, earache, and possibly vestibular symptoms. - The normal Rinne test (indicating sensorineural loss) and lack of otorrhea or earache make cholesteatoma unlikely, despite a family history.

Otology Indian Medical PG Question 10: Gelle's test is done in?

• A. Traumatic deafness
• B. Senile deafness
• C. Otosclerosis (Correct Answer)
• D. Serous otitis media

Otology Explanation: ***Otosclerosis*** - **Gelle's test** is primarily used to diagnose **otosclerosis**, a condition causing **conductive hearing loss** due to abnormal bone growth in the middle ear. - The test assesses changes in **bone conduction hearing** in response to alterations in external ear canal pressure, which is characteristic of a fixed stapes footplate in otosclerosis. *Traumatic deafness* - **Traumatic deafness** can result from direct injury to the ear, but **Gelle's test** is not a primary diagnostic tool for this type of hearing loss. - Diagnosis typically involves evaluating the **nature and extent of the trauma** and other audiometric tests. *Senile deafness* - Also known as **presbycusis**, **senile deafness** is a **sensorineural hearing loss** associated with aging. - **Gelle's test** assesses changes in bone conduction with pressure, making it less relevant for diagnosing age-related nerve damage. *Serous otitis media* - **Serous otitis media** involves fluid accumulation in the middle ear, leading to **conductive hearing loss**. - While it causes conductive hearing loss, **Gelle's test** is not the definitive diagnostic test; **tympanometry** and **audiometry** are more commonly used.

Otology Flashcard 1 of 10

Question: _____ otosclerosis is the most common type of otosclerosis.

Answer: Stapedial

Otology Flashcard 2 of 10

Question: _____ is seen in tubotympanic disease, where the ear discharge shields the round window from sound waves, and the hearing improves

Answer: Round window-shielding effect

Otology Flashcard 3 of 10

Question: What is the presenting symptom of otosclerosis?_____

Answer: Hearing loss

Otology Flashcard 4 of 10

Question: Hearing loss is of _____ type and slowly progressive in glomus tumor

Answer: conductive

Otology Flashcard 5 of 10

Question: _____ hearing in Patch test is seen in intact ossicular chain

Answer: Improved

Otology Flashcard 6 of 10

Question: _____ disease is a triad of recurrent vertigo, ear fullness / pain and unilateral hearing loss & tinnitus

Answer: Meniere

Otology Flashcard 7 of 10

Question: The following instrument is: _____

Answer: Myringotome

Otology Flashcard 8 of 10

Question: _____ retractor is used for endaural approach for ear surgery

Answer: Lempert's endaural

Otology Flashcard 9 of 10

Question: The following instrument is: _____

Answer: Jansen's self retaining mastoid retractor

Otology Flashcard 10 of 10

Question: _____ is used for removal of bony septa and granulations in mastoid surgery.

Answer: Lempert’s curette (scoop)