Community Medicine
1 questionsIn a developing country, the prevalence of diabetes mellitus is increasing at an annual rate of 1.8%. Using epidemiological principles similar to the Rule of 70, approximately how many years will it take for the diabetes prevalence to double, and what are the primary healthcare planning implications of this growth rate?
NEET-PG 2013 - Community Medicine NEET-PG Practice Questions and MCQs
Question 771: In a developing country, the prevalence of diabetes mellitus is increasing at an annual rate of 1.8%. Using epidemiological principles similar to the Rule of 70, approximately how many years will it take for the diabetes prevalence to double, and what are the primary healthcare planning implications of this growth rate?
- A. 30-35 years
- B. 35-46 years (Correct Answer)
- C. 25-30 years
- D. 20-25 years
Explanation: ***35-46 years*** - Using the **Rule of 70**, divide 70 by the annual growth rate (1.8%): 70 / 1.8 ≈ **38.89 years**. This value falls within the 35-46 year range. - The doubling of diabetes prevalence within this timeframe necessitates significant **healthcare planning implications**, including increased demand for diagnostic services, medications, and specialized care, as well as focused preventative measures. *30-35 years* - This range is too low, as the calculated doubling time of approximately **38.89 years** is longer than this range. While close, this timeframe underestimates the actual time needed for prevalence to double. *25-30 years* - This range is significantly lower than the calculated doubling time of approximately **38.89 years**, meaning it underestimates the time required for diabetes prevalence to double by about 9-14 years. *20-25 years* - This range is far too low, as the calculated doubling time of approximately **38.89 years** is much longer. This timeframe would suggest a much higher annual growth rate than the stated 1.8%.
ENT
9 questionsWhat are the potential causes of myringosclerosis?
Which of the following statements about conductive deafness is true?
Retraction of tympanic membrane touching the promontory. What is the classification according to Sade's grading system?
Which of the following conditions is least likely to be associated with sensorineural hearing loss (SNHL)?
What is the term for the condition where the tympanic membrane is retracted and touches the promontory?
What is the most common cause of ASOM?
Most commonly used tuning fork in ear examination?
What causes the cart-wheel appearance of the tympanic membrane in acute suppurative otitis media (ASOM)?
Hearing loss of 65dB, what is the grade of deafness?
NEET-PG 2013 - ENT NEET-PG Practice Questions and MCQs
Question 771: What are the potential causes of myringosclerosis?
- A. Genetic predisposition
- B. Chronic inflammation from recurrent infections (Correct Answer)
- C. Otosclerosis
- D. None of the options
Explanation: ***Chronic inflammation from recurrent infections*** - **Myringosclerosis** is often a consequence of **chronic inflammation** and repair processes in the tympanic membrane (eardrum), commonly triggered by **recurrent otitis media** (middle ear infections). - The inflammatory exudates and subsequent healing lead to the deposition of **calcium and phosphate crystals** within the fibrous layer of the tympanic membrane, causing it to become stiff and opaque. *Genetic predisposition* - While genetics can play a role in some ear conditions, **myringosclerosis** is primarily an **acquired condition** rather than one solely determined by genetic factors. - No specific strong genetic link has been identified as a primary cause compared to environmental triggers. *Otosclerosis* - **Otosclerosis** is a condition affecting the **ossicles** (typically the stapes) in the middle ear, leading to conductive hearing loss due to abnormal bone growth, not directly affecting the tympanic membrane. - Myringosclerosis involves the eardrum itself, characterized by **calcification of the tympanic membrane**, which is distinct from the pathology of otosclerosis. *None of the options* - This option is incorrect because **chronic inflammation from recurrent infections** is a well-established cause of myringosclerosis. - The presence of a correct answer negates this choice.
Question 772: Which of the following statements about conductive deafness is true?
- A. Weber's test shows no lateralization in conductive deafness.
- B. There is no decay in threshold tone in conductive deafness.
- C. Rinne's test is negative in conductive deafness. (Correct Answer)
- D. Air conduction is always completely absent in conductive deafness during Rinne's test
Explanation: ***Rinne's test is negative in conductive deafness.*** - A **negative Rinne's test** indicates that **bone conduction is heard longer or equally as long as air conduction** in the affected ear. - This occurs because the sound transmission through the middle ear is impaired due to the conductive hearing loss. *Weber's test shows no lateralization in conductive deafness.* - In unilateral conductive deafness, the **Weber's test will lateralize to the affected ear**, not show no lateralization. - This is because the sound is perceived as louder in the ear with the conductive loss due to the masking effect of ambient noise being reduced. *There is no decay in threshold tone in conductive deafness.* - **Threshold tone decay** is typically associated with **retrocochlear lesions** (sensorineural hearing loss), not conductive deafness. - Conductive hearing loss is a mechanical problem that does not affect the persistence of auditory nerve firing. *Air conduction is always completely absent in conductive deafness during Rinne's test.* - While air conduction is poorer than bone conduction (making Rinne's negative), it is **not always completely absent**. - In a profound conductive loss, air conduction might be near absent, but in milder cases, it is simply significantly reduced compared to bone conduction.
Question 773: Retraction of tympanic membrane touching the promontory. What is the classification according to Sade's grading system?
- A. Grade 1
- B. Grade 2
- C. Grade 3 (Correct Answer)
- D. Grade 4
Explanation: ***Grade 3*** - **Grade 3** retraction involves the tympanic membrane making contact with the **promontory** of the middle ear. - This contact indicates significant retraction, often with loss of definition of the malleus handle. *Grade 1* - **Grade 1** retraction is characterized by mild retraction with an **intact cone of light** and good mobility. - The tympanic membrane does not touch any middle ear structures. *Grade 2* - **Grade 2** retraction shows the tympanic membrane touching the **incudostapedial joint** or posterior wall of the middle ear. - The handle of the malleus may appear significantly foreshortened. *Grade 4* - **Grade 4** retraction involves **adhesive otitis media**, where the tympanic membrane is severely retracted and fully adherent to the middle ear structures. - This often results in a nearly complete obliteration of the middle ear space.
Question 774: Which of the following conditions is least likely to be associated with sensorineural hearing loss (SNHL)?
- A. Bartter syndrome
- B. Distal renal tubular acidosis (Correct Answer)
- C. Alport syndrome
- D. Nail-patella syndrome
Explanation: ***Distal renal tubular acidosis*** - While dRTA is associated with various systemic abnormalities like **nephrolithiasis** and **osteomalacia**, **sensorineural hearing loss (SNHL)** is **not a typical feature** of this condition. - The primary defect in dRTA is impaired acid secretion in the distal tubules, leading to **metabolic acidosis**. *Bartter syndrome* - This is a rare genetic disorder affecting the thick ascending limb of the loop of Henle, leading to **salt wasting** and **hypokalemia**. - **SNHL** has been reported in certain variants of Bartter syndrome, particularly in those with mutations affecting the **NKCC2 transporter** or other associated genes. *Alport syndrome* - A well-known genetic disorder characterized by **glomerulonephritis**, **SNHL**, and ocular abnormalities. - The SNHL in Alport syndrome is typically **bilateral and progressive**, often beginning in childhood. *Nail-patella syndrome* - This is an autosomal dominant disorder primarily affecting the **nails**, **kneecaps**, elbows, and kidneys, with about 30-50% of affected individuals developing **renal disease**. - **SNHL** is a recognized, albeit less common, manifestation of Nail-patella syndrome, thought to be related to abnormalities in the **collagen IV** network in the cochlea.
Question 775: What is the term for the condition where the tympanic membrane is retracted and touches the promontory?
- A. Mild tympanic membrane retraction
- B. Severe tympanic membrane retraction
- C. Atelectasis of the tympanic membrane (Correct Answer)
- D. Adhesive otitis media (with middle ear adhesions)
Explanation: ***Atelectasis of the tympanic membrane*** - **Atelectasis of the tympanic membrane** (TM) specifically refers to severe **retraction** where the TM collapses onto the **promontory** or other middle ear structures. - This condition indicates a significant **negative middle ear pressure**, often leading to **conductive hearing loss** and potential long-term complications if not addressed. *Mild tympanic membrane retraction* - **Mild retraction** involves the TM being drawn inward, but it does not typically make contact with the **promontory**. - This is often observed as a prominent **short process of the malleus** or a **sharper cone of light**. *Severe tympanic membrane retraction* - While **severe retraction** describes the degree of inward pulling, **atelectasis** is the more precise term when the TM actually touches the **promontory** or other middle ear structures. - The term **severe retraction** alone might not imply contact with the bony structures of the middle ear. *Adhesive otitis media (with middle ear adhesions)* - **Adhesive otitis media** involves the formation of **fibrous adhesions** within the middle ear space, often as a result of chronic inflammation, which can **fixate** the ossicles or TM. - While severe retraction can be a precursor, **adhesive otitis media** specifically refers to the presence of these **adhesions**, which are not explicitly stated in the question.
Question 776: What is the most common cause of ASOM?
- A. Meningococci
- B. Pneumococci (Correct Answer)
- C. H. influenzae
- D. Moraxella catarrhalis
Explanation: ***Pneumococci*** - **_Streptococcus pneumoniae_ (Pneumococci)** is the **most common bacterial cause** of Acute Suppurative Otitis Media (ASOM) in all age groups, particularly in young children. - It accounts for an estimated 25-50% of all ASOM cases, often leading to significant inflammation and **purulent discharge**. *Meningococci* - **_Neisseria meningitidis_ (Meningococci)** is rarely a cause of ASOM. - It is primarily known for causing **meningitis** and **sepsis**, not typically middle ear infections. *H. influenzae* - **_Haemophilus influenzae_ (non-typable)** is the **second most common cause** of ASOM, accounting for 20-40% of cases. - While significant, it is generally less prevalent than _Streptococcus pneumoniae_. *Moraxella catarrhalis* - **_Moraxella catarrhalis_** is another common causative agent of ASOM, responsible for 10-20% of cases. - It is frequently seen in conjunction with other pathogens but is not the most common on its own.
Question 777: Most commonly used tuning fork in ear examination?
- A. 128 Hz
- B. 256 Hz
- C. 512 Hz (Correct Answer)
- D. 1024 Hz
Explanation: ***512 Hz*** - The **512 Hz tuning fork** is the most commonly recommended and used for auditory tests like **Rinne** and **Weber** because its vibratory decay is slow enough to allow adequate testing, and it falls within the **speech frequency range**. - Its frequency is optimal for assessing both **bone conduction** and **air conduction** without introducing confusing overtones or being too low to be felt as a vibration rather than heard as a tone. *128 Hz* - A **128 Hz tuning fork** produces a strong vibratory sensation and is primarily used for **neurological examinations** to test **vibration sense**, not typically for ear examinations. - Its low frequency can be easily perceived as a **tactile vibration** through bone, making it less ideal for purely auditory assessment. *256 Hz* - While it falls within the audible range, a **256 Hz tuning fork** is less commonly used than 512 Hz for standard hearing tests. - Its vibratory tone may have a faster decay and might not provide as clear a distinction for **bone conduction** as the 512 Hz fork. *1024 Hz* - A **1024 Hz tuning fork** is a higher frequency tone, which may decay too quickly for accurate **Rinne and Weber tests**, especially when assessing subtle differences in hearing. - While audible, its higher pitch can be less representative of the critical **speech frequencies** typically evaluated in basic hearing screenings.
Question 778: What causes the cart-wheel appearance of the tympanic membrane in acute suppurative otitis media (ASOM)?
- A. Perforation of the tympanic membrane
- B. Edema of the tympanic membrane
- C. Congested blood vessels along the malleus (Correct Answer)
- D. Granulation tissue on the tympanic membrane
Explanation: ***Congested blood vessels along the malleus*** - The **cart-wheel appearance** in **acute suppurative otitis media (ASOM)** is a characteristic sign caused by the significant **engorgement of blood vessels** radiating out from the **malleus handle**. - This vascular congestion gives the tympanic membrane a distinct spoke-like pattern, resembling the spokes of a **cart wheel**. *Perforation of the tympanic membrane* - While **tympanic membrane perforation** can occur in ASOM, it typically signals a later stage of the disease, often leading to relief of pain and discharge, not the cart-wheel appearance. - Perforation appears as a **hole or defect** in the tympanic membrane, altering its integrity rather than its vascular pattern. *Edema of the tympanic membrane* - **Edema** (swelling) of the tympanic membrane does occur in ASOM due to inflammation, giving it a **dull, thickened, or bulging appearance**. - However, edema alone does not create the specific spoke-like pattern seen in the cart-wheel appearance; this pattern is primarily vascular. *Granulation tissue on the tympanic membrane* - **Granulation tissue** formation is more commonly associated with **chronic inflammatory processes** or healing after injury, and it would present as a **red, friable mass** on the tympanic membrane. - It is not a feature of early or established ASOM leading to the cart-wheel sign, which is an acute vascular phenomenon.
Question 779: Hearing loss of 65dB, what is the grade of deafness?
- A. Mild
- B. Moderate
- C. Severe
- D. Moderately severe (Correct Answer)
Explanation: ***Moderately severe*** - A hearing loss of **65 dB** falls within the range defined as moderately severe. - The moderately severe range typically spans from **56 dB to 70 dB** in conventional audiometric classifications. *Mild* - **Mild hearing loss** is characterized by a threshold between **26 dB and 40 dB**. - Individuals with mild hearing loss may struggle with soft sounds or speech in noisy environments. *Moderate* - **Moderate hearing loss** is defined by a threshold between **41 dB and 55 dB**. - This level of loss causes difficulty understanding normal conversation without amplification. *Severe* - **Severe hearing loss** is characterized by a threshold between **71 dB and 90 dB**. - Individuals with severe hearing loss often require powerful hearing aids or other assistive listening devices.