Non-Communicable Diseases — MCQs

Non-Communicable Diseases Indian Medical PG Practice Questions and MCQs

Question 371: An 11-month-old child presents with a respiratory rate of 58 per minute and cough, without chest indrawing. What is the next step in management?

A. Reassurance to the parent
B. Urgent referral to a hospital
C. Antibiotic with home care (Correct Answer)
D. Nasal saline drops

Explanation: This question tests your knowledge of the **IMNCI (Integrated Management of Neonatal and Childhood Illness)** guidelines for the classification and management of acute respiratory infections. ### **Explanation of the Correct Answer** According to IMNCI criteria, a child aged 2 months to 5 years is classified based on respiratory rate and clinical signs: * **Fast Breathing:** For an 11-month-old, a respiratory rate of **≥50 breaths per minute** is defined as fast breathing. * **Classification:** Since the child has a cough and fast breathing (58/min) but **no chest indrawing** and **no danger signs**, the condition is classified as **Pneumonia**. * **Management:** IMNCI guidelines recommend treating "Pneumonia" with an **oral antibiotic** (usually Amoxicillin) for 5 days and **home care** (soothing the throat, fluid intake, and monitoring for worsening signs). ### **Why Other Options are Incorrect** * **Option A & D:** Reassurance or nasal drops alone are insufficient. Because the child meets the criteria for fast breathing, it is classified as pneumonia, which requires antibiotic therapy to prevent progression to severe disease. * **Option B:** Urgent referral is indicated for **"Severe Pneumonia or Very Severe Disease,"** characterized by chest indrawing or any general danger signs (e.g., inability to drink, lethargy, convulsions, or stridor in a calm child). This child does not have these signs. ### **High-Yield Clinical Pearls for NEET-PG** * **IMNCI Fast Breathing Cut-offs:** * <2 months: ≥60/min * 2–12 months: ≥50/min * 12 months–5 years: ≥40/min * **First-line Antibiotic:** Oral Amoxicillin (40 mg/kg/dose twice daily) is now the preferred first-line treatment for non-severe pneumonia in the community. * **General Danger Signs:** Always check for the ability to breastfeed/drink, vomiting everything, convulsions, and lethargy/unconsciousness. Presence of any of these necessitates immediate referral.

Question 372: What is Broca's index?

A. Weight minus 100
B. Height minus 100 (Correct Answer)
C. Height divided by weight
D. Weight divided by height

Explanation: **Explanation:** **Broca’s Index** is a simple, historical method used to estimate the **Ideal Body Weight (IBW)** of an individual. It is particularly useful in clinical settings for quick assessments when complex calculations are not feasible. * **Why Option B is Correct:** The formula for Broca’s Index is: **Ideal Weight (kg) = Height (cm) – 100** For example, if a person is 170 cm tall, their ideal weight according to this index would be 70 kg (170 - 100). While it is less precise than the Body Mass Index (BMI), it remains a high-yield topic in Community Medicine exams due to its simplicity. * **Why Other Options are Incorrect:** * **Option A:** "Weight minus 100" has no physiological basis for determining nutritional status. * **Option C & D:** These represent ratios. **BMI (Quetelet's Index)** uses a specific ratio: $Weight (kg) / Height (m^2)$. Broca’s Index is a subtraction-based formula, not a division-based ratio. **High-Yield Clinical Pearls for NEET-PG:** 1. **Modified Broca’s Index:** Often used for more accuracy in men (Height - 100) and women (Height - 105). 2. **Corpulence Index:** Actual weight / Ideal weight (calculated by Broca's Index). A value >1.2 indicates obesity. 3. **Ponderal Index:** $Height (cm) / \sqrt[3]{Weight (kg)}$. Useful in pediatrics. 4. **Lorentz’s Formula:** A more refined version of Broca’s index: $Height (cm) - 100 - [(Height - 150) / 4]$. 5. **BMI Classification:** Remember the WHO classification (Normal: 18.5–24.9) vs. the **Asian-Indian classification** (Normal: 18–22.9; Overweight: 23–24.9; Obese: ≥25).

Question 373: Which of the following is not a risk factor for the development of diabetes mellitus?

A. Sedentary lifestyle
B. Protein-energy malnutrition in infancy
C. Excessive intake of alcohol
D. High intake of vitamin A (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. High intake of vitamin A**. Vitamin A is a fat-soluble vitamin essential for vision and immune function, but there is no established clinical evidence linking its high intake to an increased risk of Diabetes Mellitus (DM). In fact, some studies suggest that beta-carotene (a precursor) may have protective antioxidant properties. **Analysis of Options:** * **Sedentary Lifestyle (Option A):** Physical inactivity is a primary modifiable risk factor for Type 2 DM. It leads to obesity and decreased insulin sensitivity in skeletal muscles, promoting insulin resistance. * **Protein-Energy Malnutrition (PEM) in Infancy (Option B):** This is a high-yield concept known as the **Barker Hypothesis** (Fetal Origins of Adult Disease). Malnutrition during early development can lead to permanent changes in pancreatic beta-cell mass and function, increasing the risk of "Malnutrition-Related Diabetes Mellitus" (MRDM) or Type 2 DM in adulthood. * **Excessive Intake of Alcohol (Option C):** Chronic alcohol consumption is a risk factor as it can cause chronic pancreatitis (leading to secondary diabetes) and contributes to obesity and hepatic insulin resistance. **NEET-PG High-Yield Pearls:** * **Modifiable Risk Factors for DM:** Obesity (BMI >25 kg/m²), physical inactivity, hypertension, and dyslipidemia. * **Non-Modifiable Risk Factors:** Age, family history (stronger genetic link in Type 2 than Type 1), and history of Gestational Diabetes. * **Rule of Halves:** DM follows the "Rule of Halves"—half of the cases are undiagnosed, and half of those diagnosed are not under care. * **Screening:** The WHO recommends screening for DM in individuals aged 30+ with one or more risk factors.

Question 374: A person is said to have died due to a road traffic accident if the death occurs within how many days of the accident?

A. 12 days
B. 30 days (Correct Answer)
C. 40 days
D. 47 days

Explanation: **Explanation:** The definition of a death due to a Road Traffic Accident (RTA) is standardized globally for statistical and epidemiological purposes. According to the **World Health Organization (WHO)** and the **Vienna Convention on Road Traffic**, a road accident fatality is defined as any person who dies immediately or **within 30 days** as a result of the injury sustained in the accident. **Why 30 days is correct:** This timeframe is used to ensure uniformity in reporting across different countries. It accounts for delayed deaths resulting from secondary complications of the initial trauma, such as sepsis, multi-organ failure, or pulmonary embolism, while maintaining a clear causal link to the accident. **Analysis of Incorrect Options:** * **Option A (12 days):** This is an arbitrary number with no clinical or legal significance in mortality reporting. * **Option C (40 days):** While some legal systems (like the Indian Penal Code Section 320) use 20 days to define "grievous hurt," 40 days is not a standard cutoff for RTA mortality. * **Option D (47 days):** This is incorrect and does not correspond to any standard epidemiological definition in Community Medicine. **High-Yield Clinical Pearls for NEET-PG:** * **The Golden Hour:** The first 60 minutes following the trauma where prompt medical intervention has the highest likelihood of preventing death. * **Epidemiological Triad of RTA:** Includes the **Agent** (the vehicle), the **Host** (the driver/pedestrian), and the **Environment** (road conditions, weather, lighting). * **Haddon’s Matrix:** A vital framework used to analyze RTAs based on three phases: Pre-crash, Crash, and Post-crash. * **Leading Cause of Death:** RTAs are the leading cause of death globally for children and young adults aged 5–29 years.

Question 375: Child survival index is the percentage of children surviving till what age?

A. 1 year
B. 3 years
C. 5 years (Correct Answer)
D. 15 years

Explanation: **Explanation:** The **Child Survival Index (CSI)** is a critical indicator used in public health to measure the probability of a child surviving the most vulnerable period of early life. It is calculated as the percentage of children who survive until their **5th birthday**. **Why 5 years is correct:** The Under-5 mortality rate is considered the best single indicator of social development and well-being rather than just health status. The formula used is: * **Child Survival Index = (1000 - Under-5 Mortality Rate) / 10** This index reflects the effectiveness of immunization, nutrition (like breastfeeding), and the management of common childhood illnesses like diarrhea and pneumonia, which are the leading causes of death in this age group. **Why other options are incorrect:** * **1 year:** Survival up to 1 year is measured by the **Infant Mortality Rate (IMR)**. While IMR is a sensitive indicator of socio-economic conditions, the CSI specifically looks at the broader "Under-5" window. * **3 years:** There is no standard global health index specifically measuring survival up to 3 years; however, this is often the age where growth monitoring is most intensive. * **15 years:** Survival up to 15 years relates to "Childhood Mortality" in a broader sense, but the CSI is strictly focused on the high-risk period of early childhood (0-5 years). **High-Yield Facts for NEET-PG:** * **Under-5 Mortality Rate (U5MR):** Defined as the number of deaths per 1,000 live births before reaching age 5. * **Indicator of Development:** UNICEF considers U5MR the single best indicator of the state of a nation's children. * **Sustainable Development Goals (SDG):** The target (Goal 3.2) is to reduce under-5 mortality to at least as low as **25 per 1,000 live births** by 2030.

Question 376: Inanimate objects involved in the transmission of infectious agents are considered which of the following?

A. Vector
B. Fomites (Correct Answer)
C. Vehicle
D. Droplet

Explanation: ### Explanation **Correct Answer: B. Fomites** **Why it is correct:** In epidemiology, **fomites** are defined as inanimate objects or materials (other than food or water) which are likely to carry infection. Examples include clothes, bedding, towels, handkerchiefs, surgical instruments, and dressings. These objects become contaminated by direct contact with an infectious source (e.g., discharge from the nose or throat) and subsequently transmit the pathogen to a new host. **Analysis of Incorrect Options:** * **A. Vector:** These are living carriers (usually arthropods like mosquitoes, ticks, or fleas) that transport an infectious agent from an infected individual to a susceptible individual. * **C. Vehicle:** While also inanimate, a "vehicle" typically refers to a medium that transmits the agent to many people simultaneously, such as **water, food, milk, or biological products** (blood/plasma). Fomites are a specific sub-category of indirect contact transmission, whereas vehicles often imply a common source. * **D. Droplet:** This refers to direct projection of spray (moisture particles >5 microns) onto the conjunctiva or mucous membranes during coughing, sneezing, or talking. It is a form of direct transmission, not an inanimate object. **NEET-PG High-Yield Pearls:** * **Fomite-borne diseases:** Trachoma (via towels), Scabies (via clothes), and Fungal infections (via combs/brushes). * **Vehicle vs. Vector:** Remember, **Vehicles are non-living** (Water/Food), while **Vectors are living** (Insects). * **Droplet Nuclei:** These are tiny particles (<5 microns) that remain suspended in the air for long periods, leading to **airborne transmission** (e.g., Tuberculosis, Measles), unlike larger droplets which settle quickly.

Question 377: Mass treatment of trachoma is undertaken if the prevalence in the community is:

A. 3%
B. 10% (Correct Answer)
C. 5%
D. 6%

Explanation: **Explanation:** The correct answer is **10%**. This threshold is based on the World Health Organization (WHO) guidelines for the **SAFE strategy** (Surgery, Antibiotics, Facial cleanliness, and Environmental improvement) used to eliminate blinding trachoma. 1. **Why 10% is correct:** According to WHO recommendations, if the prevalence of **active trachoma** (Trachomatous inflammation—Follicular or TF) in children aged 1–9 years is **10% or higher**, the entire community (mass treatment) should receive annual antibiotic distribution (usually oral Azithromycin) for at least three years before re-surveying. 2. **Why other options are incorrect:** * **5%:** This is the target threshold for elimination. If the prevalence is **below 5%**, mass antibiotic administration is no longer required, and treatment shifts to a case-by-case basis. * **3% and 6%:** These values do not represent standard WHO decision-making cut-offs for mass drug administration (MDA) in trachoma control programs. **High-Yield Clinical Pearls for NEET-PG:** * **SAFE Strategy:** * **S**urgery (for Trichiasis) * **A**ntibiotics (Mass Drug Administration) * **F**acial cleanliness * **E**nvironmental improvement (Water and Sanitation) * **Drug of Choice:** A single oral dose of **Azithromycin** (20 mg/kg up to 1g) is the mainstay for mass treatment. 1% Tetracycline eye ointment is an alternative. * **Causative Agent:** *Chlamydia trachomatis* (Serotypes A, B, Ba, and C). * **Vector:** The common housefly (*Musca sorbens*) acts as a mechanical vector.

Question 378: Which of the following is NOT a mosquito-borne disease?

A. Tularemia (Correct Answer)
B. Yellow fever
C. Kala-azar
D. Dengue fever

Explanation: ### Explanation **Correct Answer: A. Tularemia** **1. Why Tularemia is the correct answer:** Tularemia (caused by the bacterium *Francisella tularensis*) is primarily a **zoonotic disease**. It is most commonly transmitted to humans through skin contact with infected animals (especially rabbits, hence "Rabbit Fever"), ingestion of contaminated water/meat, or the bite of infected **ticks** (e.g., *Dermacentor*) and **deer flies**. It is **not** transmitted by mosquitoes. **2. Analysis of Incorrect Options:** * **B. Yellow Fever:** This is a classic mosquito-borne viral hemorrhagic fever. It is transmitted primarily by the **_Aedes aegypti_** mosquito (urban cycle) and *Haemagogus* species (sylvatic cycle). * **C. Kala-azar (Visceral Leishmaniasis):** While primarily transmitted by the **Sandfly** (*Phlebotomus argentipes*), it is often categorized under "Vector-borne diseases." However, in the context of this specific question, it serves as a distractor. *Note: Some older classifications or specific regional variants may occasionally link certain vectors, but Yellow Fever and Dengue are definitive mosquito-borne diseases.* * **D. Dengue Fever:** This is the most common mosquito-borne viral disease in India, transmitted by the **_Aedes aegypti_** (primary) and **_Aedes albopictus_** mosquitoes. **3. NEET-PG High-Yield Clinical Pearls:** * **Vector Identification:** Always remember the "Big Five" mosquito-borne diseases in India: Malaria (*Anopheles*), Filariasis (*Culex*), Dengue, Chikungunya, and Zika (*Aedes*). * **Tularemia Key Fact:** It is highly infectious; a very low dose (10–50 organisms) can cause disease, making it a potential **bioterrorism agent** (Category A). * **Kala-azar Vector:** The Sandfly is much smaller than a mosquito and breeds in cracks/crevices of damp mud houses. * **Yellow Fever Status:** India is "Yellow Fever receptive" because the vector (*Aedes*) is present, but the disease is currently absent. This is why a valid vaccination certificate is mandatory for international travelers from endemic zones.

Question 379: A 2-year-old boy presents with cough, fever, and difficulty in breathing. His respiratory rate is 50/min. There is no chest indrawing. Auscultation of the chest reveals bilateral crepitations. What is the most probable diagnosis?

A. Very severe pneumonia
B. Severe pneumonia
C. Pneumonia (Correct Answer)
D. No pneumonia

Explanation: This question is based on the **Integrated Management of Neonatal and Childhood Illness (IMNCI)** guidelines, which are high-yield for NEET-PG. The classification of acute respiratory infections in children aged 2 months to 5 years is based on clinical signs: respiratory rate, chest indrawing, and danger signs. ### **Explanation of the Correct Answer** **Option C (Pneumonia)** is correct because the child has **fast breathing** without any "red flag" signs. * For a child aged **12 months to 5 years**, fast breathing is defined as a **Respiratory Rate (RR) ≥ 40 breaths/min**. * This child’s RR is 50/min, confirming fast breathing. * The absence of chest indrawing or general danger signs classifies this specifically as "Pneumonia" under IMNCI. ### **Why Other Options are Incorrect** * **Option A & B (Very Severe/Severe Pneumonia):** In the updated IMNCI/WHO guidelines, these are often grouped. They require the presence of **chest indrawing** (Severe) or **General Danger Signs** (Very Severe), such as inability to drink/breastfeed, persistent vomiting, lethargy/unconsciousness, or convulsions. This child has none of these. * **Option D (No Pneumonia):** This classification is used when a child has a cough/cold but the RR is normal (e.g., <40/min for this age) and no chest indrawing is present. ### **NEET-PG High-Yield Pearls** 1. **RR Thresholds for Fast Breathing:** * < 2 months: ≥ 60/min * 2–12 months: ≥ 50/min * 12 months–5 years: ≥ 40/min 2. **Management:** "Pneumonia" is treated with oral Amoxicillin at home for 5 days. "Severe Pneumonia" requires urgent referral and IV antibiotics (Ampicillin + Gentamicin). 3. **Auscultation:** While crepitations are mentioned, IMNCI classification relies primarily on **inspection** (RR and indrawing) to facilitate use by peripheral health workers.

Question 380: Safe injection practices can prevent which of the following diseases?

A. Hepatitis B (Correct Answer)
B. Hepatitis A
C. Typhoid
D. Hepatitis E

Explanation: **Explanation:** The core concept behind this question is the **mode of transmission** of viral hepatitis. Safe injection practices are designed to prevent the transmission of **blood-borne pathogens** (infections spread through blood and body fluids). **Why Hepatitis B is correct:** Hepatitis B Virus (HBV) is primarily transmitted through parenteral routes, including contaminated needles, syringes, and medical equipment. Safe injection practices—such as using a sterile needle for every patient, preventing needle-stick injuries, and avoiding the reuse of multidose vials—directly interrupt this chain of transmission. Other blood-borne diseases prevented by these practices include Hepatitis C and HIV. **Why the other options are incorrect:** * **Hepatitis A and Hepatitis E:** These viruses are transmitted via the **fecal-oral route**, usually through contaminated food or water. While they are types of hepatitis, they are not typically associated with percutaneous (injection) exposure. * **Typhoid (Enteric Fever):** Caused by *Salmonella typhi*, this is also a water-borne/food-borne disease transmitted via the fecal-oral route. **High-Yield Clinical Pearls for NEET-PG:** * **HBV Infectivity:** HBV is highly infectious; the risk of transmission after a needle-stick injury from an HBeAg-positive source is approximately **30%** (compared to 3% for HCV and 0.3% for HIV). * **WHO Definition:** A safe injection is one that does not harm the recipient, does not expose the provider to any avoidable risk, and does not result in waste that is dangerous to the community. * **Injection Safety:** The use of **Auto-Disable (AD) syringes** is the gold standard recommended by the WHO to prevent reuse.

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