Non-Communicable Diseases — MCQs
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Which of the following management therapies is included in the secondary prevention of myocardial infarction?
A 2-year-old female weighing 5 kg was brought to a Primary Health Centre with a 4-day history of cough and fever, and inability to drink for the last 12 hours. On examination, her respiratory rate was 45/minute and she had a fever. According to the classification, how would this child be categorized?
Contraceptive efficacy is expressed as?
The prepatent period in lymphatic filariasis is defined as the time interval between inoculation of infective larvae and which of the following?
Japanese B encephalitis virus is transmitted by which mosquito?
Which type of sample can be used to isolate poliovirus earliest?
In a village affected by a cholera epidemic, what is the first step that should be taken to prevent deaths?
What is false about pertussis?
A nurse educator is teaching a group of clients about exercise. A female client asks how often she should exercise to meet the goals of a planned exercise program. What is the recommended frequency for exercise?
Which of the following is not included in the primary prevention for hypertension?
Non-Communicable Diseases Indian Medical PG Practice Questions and MCQs
Question 241: Which of the following management therapies is included in the secondary prevention of myocardial infarction?
- A. Antiplatelet therapy
- B. ACE inhibitor
- C. Statins
- D. All of the above (Correct Answer)
Explanation: **Explanation:** The core concept in this question is the distinction between levels of prevention. **Secondary prevention** aims to halt the progress of a disease in its early stages and prevent complications or recurrences after the disease has already manifested. In the context of Myocardial Infarction (MI), secondary prevention focuses on patients who have already experienced a cardiac event or have established coronary artery disease (CAD). **Why "All of the above" is correct:** The goal of post-MI management is to prevent a second infarct and reduce mortality. The standard "cardioprotective" regimen includes: * **Antiplatelet therapy (e.g., Aspirin, Clopidogrel):** Prevents further thrombus formation on existing atherosclerotic plaques. * **ACE Inhibitors:** Prevent ventricular remodeling and reduce the workload on the heart, significantly improving survival rates post-MI. * **Statins:** Provide intensive lipid-lowering and "pleiotropic effects" (stabilizing existing plaques to prevent rupture). * **Beta-blockers:** Also a mainstay of secondary prevention to reduce myocardial oxygen demand. **Analysis of Options:** Since all three medications (A, B, and C) are evidence-based interventions used *after* the onset of disease to prevent recurrence, they all fall under the umbrella of secondary prevention. Therefore, none of the individual options are "wrong," but they are incomplete on their own. **High-Yield Clinical Pearls for NEET-PG:** * **Primordial Prevention:** Discouraging the adoption of harmful lifestyles (e.g., preventing children from starting smoking). * **Primary Prevention:** Controlling risk factors in healthy individuals (e.g., treating hypertension or obesity before an MI occurs). * **Tertiary Prevention:** Cardiac rehabilitation and disability limitation after a major stroke or heart failure has occurred. * **Rule of Thumb:** If the patient already has the diagnosis, the management is usually Secondary Prevention.
Question 242: A 2-year-old female weighing 5 kg was brought to a Primary Health Centre with a 4-day history of cough and fever, and inability to drink for the last 12 hours. On examination, her respiratory rate was 45/minute and she had a fever. According to the classification, how would this child be categorized?
- A. Very severe disease (Correct Answer)
- B. Severe pneumonia
- C. Pneumonia
- D. No pneumonia
Explanation: This question tests the application of the **IMNCI (Integrated Management of Neonatal and Childhood Illness)** guidelines for a child aged 2 months to 5 years presenting with cough or difficult breathing. ### **Explanation of the Correct Answer** According to IMNCI protocols, the classification is based on the presence of "General Danger Signs." In this case, the child has the inability to drink/breastfeed. **The presence of ANY one of the following General Danger Signs classifies the child as "Very Severe Disease":** 1. Inability to drink or breastfeed. 2. Vomiting everything. 3. Convulsions (during current illness). 4. Lethargy or unconsciousness. 5. Stridor in a calm child. Even though the respiratory rate (45/min) is technically "fast breathing" for a 2-year-old (threshold ≥40/min), the presence of a **General Danger Sign** overrides the pneumonia classification and upgrades it to **Very Severe Disease**. ### **Analysis of Incorrect Options** * **B. Severe Pneumonia:** This classification is used when there is **chest indrawing** but no General Danger Signs. * **C. Pneumonia:** This is classified when there is **fast breathing** (≥40/min for age 1–5 years) but no chest indrawing and no General Danger Signs. * **D. No Pneumonia:** This is used when there is only cough/cold with a normal respiratory rate and no danger signs. ### **NEET-PG High-Yield Pearls** * **Fast Breathing Thresholds:** * <2 months: ≥60/min * 2–12 months: ≥50/min * 12 months–5 years: ≥40/min * **Weight-for-Age:** Note that this 2-year-old weighs only 5 kg (expected weight ~12 kg), indicating **Severe Underweight**, which further increases the risk of mortality in Very Severe Disease. * **Management:** Children classified with Very Severe Disease require an urgent pre-referral dose of an appropriate antibiotic (e.g., IM Ampicillin/Gentamicin) and immediate referral to a higher center.
Question 243: Contraceptive efficacy is expressed as?
- A. 100 women-months
- B. 1000 women-years
- C. 100 women-years (Correct Answer)
- D. 10 women-years
Explanation: **Explanation:** The efficacy of a contraceptive method is traditionally expressed using the **Pearl Index**. This index calculates the number of unintended pregnancies that occur per **100 women-years** of exposure. **1. Why "100 women-years" is correct:** The Pearl Index is the standard formula used to compare the effectiveness of different birth control methods. One "woman-year" represents one woman using a method for one year (or 13 menstrual cycles). By calculating failures per 100 women-years, the result represents the **failure rate percentage** per year of use. * *Formula:* (Total number of pregnancies × 1200) / (Total number of months of exposure). **2. Why other options are incorrect:** * **A. 100 women-months:** This is too short a duration to account for seasonal variations or long-term consistency in usage. * **B & D. 1000 or 10 women-years:** These are not the standard denominators used in international public health reporting. Using 100 allows for an easy "percentage" interpretation (e.g., a Pearl Index of 1 means a 1% failure rate). **High-Yield Clinical Pearls for NEET-PG:** * **Pearl Index vs. Life Table Analysis:** While the Pearl Index is common, **Life Table Analysis** is considered superior because it calculates failure rates at specific intervals (e.g., at 6 months, 12 months) and accounts for "drop-outs." * **Most Effective:** Implants (0.05) and Vasectomy (0.1) have the lowest Pearl Indices. * **Theoretical vs. Typical Use:** Always distinguish between "perfect use" (method efficacy) and "typical use" (user efficacy) in exam questions. * **Rule of Thumb:** The lower the Pearl Index, the higher the contraceptive efficacy.
Question 244: The prepatent period in lymphatic filariasis is defined as the time interval between inoculation of infective larvae and which of the following?
- A. Blockage of lymphatics
- B. First appearance of detectable microfilaria (Correct Answer)
- C. Development of lymphoedema
- D. Development of adult worm
Explanation: ### Explanation **Concept Overview:** In parasitology, the **prepatent period** is the time interval between the entry of the infective stage of a parasite into the host and the earliest time at which its presence can be demonstrated (usually via the detection of eggs, larvae, or microfilariae in clinical samples). **Why Option B is Correct:** In Lymphatic Filariasis, the infective stage is the **L3 larvae** (inoculated by the mosquito). These larvae migrate to the lymphatics and mature into adult worms. The prepatent period ends when these adult worms mate and produce **microfilariae (mf)** that can be detected in the peripheral blood. For *Wuchereria bancrofti*, this period typically lasts **8 to 12 months**. **Analysis of Incorrect Options:** * **Option A & C (Blockage/Lymphoedema):** These represent the **Incubation Period** (time between infection and clinical symptoms) or the chronic stage of the disease. The prepatent period is a biological timeline, whereas these are clinical milestones. * **Option D (Development of adult worm):** While the development of the adult worm occurs during the prepatent period, the period only "ends" once the worm begins producing detectable offspring (microfilariae). **High-Yield NEET-PG Pearls:** * **Infective Stage:** L3 Larvae (transmitted by *Culex quinquefasciatus* for Bancroftian filariasis). * **Diagnostic Stage:** Microfilaria (detected via peripheral blood smear, ideally collected between 10 PM – 2 AM due to nocturnal periodicity). * **Incubation Period:** Usually 8–16 months (longer than the prepatent period). * **Drug of Choice:** Diethylcarbamazine (DEC) 6mg/kg for 12 days. * **National Target:** The Global Programme to Eliminate Lymphatic Filariasis (GPELF) aims for **elimination**, not eradication, primarily through Mass Drug Administration (MDA).
Question 245: Japanese B encephalitis virus is transmitted by which mosquito?
- A. Aedes aegypti
- B. Culex fatigans
- C. Culex tritaeniorhynchus (Correct Answer)
- D. Hard tick
Explanation: **Explanation:** Japanese Encephalitis (JE) is a major public health concern in India, caused by a Group B Arbovirus (Flavivirus). The correct answer is **Culex tritaeniorhynchus**, which is the primary vector for JE in India and Southeast Asia. **1. Why Culex tritaeniorhynchus is correct:** These mosquitoes are "exophilic" (outdoor resters) and "zoophilic" (prefer animal blood). They breed primarily in irrigated rice fields and shallow ditches. The virus follows a **Pig-Mosquito-Man** cycle. Pigs act as the "amplifier hosts," allowing the virus to multiply to high titers without getting sick, which the Culex mosquito then transmits to humans. **2. Analysis of Incorrect Options:** * **Aedes aegypti:** This is the primary vector for Dengue, Chikungunya, Yellow Fever, and Zika virus. It is a day-biter and breeds in stagnant clean water. * **Culex fatigans (C. quinquefasciatus):** This is the principal vector for **Bancroftian Filariasis**. While it belongs to the same genus, it is not the primary vector for JE. * **Hard tick (Ixodid ticks):** These are vectors for diseases like Kyasanur Forest Disease (KFD), Indian Tick Typhus, and Tularemia, but not JE. **High-Yield Clinical Pearls for NEET-PG:** * **Dead-end Host:** Humans are dead-end hosts for JE because the viraemia in humans is insufficient to infect a biting mosquito. * **Incidental Host:** Man is an incidental host; the natural cycle is between mosquitoes, pigs, and water birds (Ardeid birds like herons and egrets). * **Vaccination:** The most common vaccine used in the Universal Immunization Programme (UIP) in India is the **SA-14-14-2** (Live attenuated vaccine), given at 9 months and 16–24 months. * **Seasonality:** JE outbreaks typically coincide with the monsoon and post-monsoon periods due to increased mosquito breeding in paddy fields.
Question 246: Which type of sample can be used to isolate poliovirus earliest?
- A. Stool (Correct Answer)
- B. Blood
- C. Throat swab
- D. Cerebrospinal fluid (CSF)
Explanation: **Explanation:** The correct answer is **Stool (Option A)**. **Why Stool is Correct:** Poliovirus is an enterovirus that primarily replicates in the lymphoid tissues of the gastrointestinal tract (Peyer's patches). While the virus is present in the throat early on, it is excreted in the **stool** for a much longer duration and in higher concentrations. In the context of surveillance (especially Acute Flaccid Paralysis or AFP surveillance), stool is the specimen of choice because the virus can be detected as early as 72 hours after infection and continues to be shed for **3 to 6 weeks**. For diagnostic purposes, two stool samples collected 24 hours apart within 14 days of the onset of paralysis are required. **Why Other Options are Incorrect:** * **Blood:** Viremia in polio is transient and occurs very early during the "minor illness" phase. By the time neurological symptoms or paralysis appear, the virus is usually cleared from the bloodstream. * **Throat Swab:** The virus is present in the nasopharynx for only a short period (usually the first week). It disappears much faster than it does from the stool, making it a less reliable source for isolation. * **CSF:** Interestingly, poliovirus is **rarely isolated from the CSF**, even in patients with paralytic poliomyelitis. Diagnosis is instead confirmed by stool culture or serology. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for Diagnosis:** Viral isolation from stool. * **AFP Surveillance:** Requires "Adequate Stool Samples" (2 samples, 24 hours apart, within 14 days of paralysis onset, arriving at the lab in a "cold chain"). * **Most Common Outcome:** 90-95% of polio infections are asymptomatic (Inapparent infection). * **Type 2 Polio:** Declared eradicated globally in 2015.
Question 247: In a village affected by a cholera epidemic, what is the first step that should be taken to prevent deaths?
- A. Treat everyone
- B. Initiate chemoprophylaxis
- C. Administer cholera vaccination
- D. Ensure safe water supply and sanitation (Correct Answer)
Explanation: **Explanation:** The primary goal during a cholera epidemic is to interrupt the transmission cycle and prevent further mortality. Cholera is a water-borne disease caused by *Vibrio cholerae*, primarily transmitted via the **fecal-oral route**. **Why Option D is Correct:** Ensuring a **safe water supply and sanitation** is the most critical and immediate intervention. In an epidemic, the source of infection is usually a contaminated water body. Chlorination of water and proper excreta disposal are the most effective ways to stop the rapid spread of the pathogen to the healthy population. While rehydration (ORS/IV fluids) is the first step in *clinical management* of a patient, environmental sanitation is the first step in *public health prevention* to stop the outbreak. **Why Other Options are Incorrect:** * **A. Treat everyone:** Mass treatment is neither feasible nor effective as a preventive strategy. Only symptomatic cases and their immediate contacts require medical intervention. * **B. Initiate chemoprophylaxis:** According to WHO, mass chemoprophylaxis is **not recommended** because it does not prevent the spread of the disease, has a short-lived effect, and leads to antibiotic resistance. It is only considered for close household contacts. * **C. Administer cholera vaccination:** Vaccines are a **pre-exposure** tool. During an active epidemic, they are not the first priority because they take time to induce immunity and do not address the immediate source of contamination. **Clinical Pearls for NEET-PG:** * **Gold Standard for Diagnosis:** Stool culture (using TCBS medium). * **Most Important Treatment:** Prompt rehydration (ORS is the mainstay). * **Antibiotic of Choice:** Doxycycline (single dose) is the drug of choice for adults to reduce the duration of shedding. * **Indicator of Water Safety:** Free residual chlorine of **0.5 mg/L** is recommended during an outbreak.
Question 248: What is false about pertussis?
- A. Maternal antibody provides protection in infants. (Correct Answer)
- B. Fomites play a small role in the spread of disease.
- C. It is commonly seen in infants.
- D. Males and females are equally affected.
Explanation: **Explanation:** The correct answer is **A (Maternal antibody provides protection in infants)** because this statement is false. Unlike diseases like Measles, maternal antibodies against *Bordetella pertussis* do not cross the placenta in sufficient quantities to provide passive immunity to the newborn. Consequently, infants are susceptible to pertussis from birth, which is why the disease is most severe and carries the highest mortality in this age group. **Analysis of other options:** * **Option B:** Pertussis is primarily spread via **droplet infection**. While the bacteria can survive for short periods on surfaces, **fomites play a negligible/small role** in transmission compared to direct respiratory contact. * **Option C:** Pertussis is **commonly seen in infants** and young children (under 5 years). In fact, the "shift to the right" (older age groups) is seen only in highly vaccinated populations, but globally, infants remain the primary risk group. * **Option D:** Epidemiologically, pertussis shows **no significant gender predilection**; both males and females are affected equally, although some studies historically suggested a slightly higher incidence/mortality in females. **High-Yield Clinical Pearls for NEET-PG:** * **Incubation Period:** 7–14 days (Range: 5–21 days). * **Infectivity:** Highest during the **catarrhal stage**. * **Drug of Choice:** Erythromycin (or other Macrolides like Azithromycin) for 7–14 days. * **Vaccination:** The "P" in DPT. To overcome the lack of maternal immunity, the WHO and National Immunization Schedule recommend starting the primary series at **6 weeks** of age. * **Secondary Attack Rate (SAR):** Very high, approximately **80–90%** in susceptible household contacts.
Question 249: A nurse educator is teaching a group of clients about exercise. A female client asks how often she should exercise to meet the goals of a planned exercise program. What is the recommended frequency for exercise?
- A. At least once a week
- B. At least three times a week (Correct Answer)
- C. At least five times a week
- D. Every day
Explanation: **Explanation:** The correct answer is **B. At least three times a week.** To achieve measurable cardiovascular benefits and improve physical fitness, exercise must be performed with sufficient frequency to maintain a "training effect." According to standard public health guidelines (including WHO and CDC), aerobic exercise should be performed at least **3 to 5 times per week**. Exercising three times a week is considered the minimum threshold to improve aerobic capacity ($VO_2$ max), regulate blood pressure, and improve insulin sensitivity. **Analysis of Options:** * **Option A (Once a week):** This frequency is insufficient to produce physiological adaptations or significant health benefits. It does not maintain the metabolic momentum required for chronic disease prevention. * **Option C & D (Five times/Every day):** While exercising 5–7 days a week is excellent for weight loss and high-level fitness, it is not the *minimum* recommended frequency to meet basic program goals. For many beginners, daily high-intensity exercise may also increase the risk of musculoskeletal injuries and burnout. **NEET-PG High-Yield Pearls:** * **WHO Recommendations:** For adults (18–64 years), the goal is at least **150 minutes** of moderate-intensity or **75 minutes** of vigorous-intensity aerobic activity per week. * **The FITT Principle:** Frequency (3–5 times/week), Intensity (60–90% of Max Heart Rate), Time (20–60 minutes), and Type (Aerobic vs. Anaerobic). * **Target Heart Rate (THR):** Calculated as $(220 - \text{Age}) \times \text{desired intensity \%}$. * **Sedentary Behavior:** Even with regular exercise, prolonged sitting is an independent risk factor for NCDs (Non-Communicable Diseases).
Question 250: Which of the following is not included in the primary prevention for hypertension?
- A. Exercises
- B. Weight control
- C. Health education
- D. Early diagnosis and treatment (Correct Answer)
Explanation: ### Explanation The core of this question lies in understanding the **Levels of Prevention** in public health. **Why "Early diagnosis and treatment" is the correct answer:** Early diagnosis and treatment (e.g., screening for high BP and starting antihypertensives) is the hallmark of **Secondary Prevention**. The goal of secondary prevention is to halt the progress of a disease in its early stages and prevent complications. Since the question asks which option is *not* part of primary prevention, this is the correct choice. **Analysis of Incorrect Options (Primary Prevention):** Primary prevention aims to prevent the onset of disease by controlling risk factors before the disease process begins. It is divided into Health Promotion and Specific Protection. * **A. Exercises & B. Weight control:** These are "Lifestyle Modifications" aimed at the general population or high-risk individuals to prevent the development of hypertension. * **C. Health Education:** This is a mode of intervention under "Health Promotion" that encourages healthy behaviors (like low salt intake) to keep the disease from occurring. **High-Yield NEET-PG Pearls:** 1. **Primordial Prevention:** Prevention of the *emergence* of risk factors (e.g., discouraging children from starting a sedentary lifestyle). 2. **Primary Prevention:** Action taken *prior* to the onset of disease (e.g., salt restriction, exercise). 3. **Secondary Prevention:** Action which *halts* the progress of a disease (e.g., screening camps, starting Amlodipine). 4. **Tertiary Prevention:** All measures available to reduce or limit *impairments and disabilities* (e.g., cardiac rehabilitation after a stroke caused by HTN). 5. **Rule of Halves:** In hypertension, only half the people are aware they have it; of those, only half are treated; and of those, only half are adequately controlled.
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