Non-Communicable Diseases — MCQs

Non-Communicable Diseases Indian Medical PG Practice Questions and MCQs

Question 211: Benzathine penicillin treatment in Rheumatic Heart Disease (RHD) is aimed at which of the following types of prevention?

A. Primary prevention
B. Secondary prevention (Correct Answer)
C. Primordial prevention
D. Tertiary prevention

Explanation: **Explanation:** The correct answer is **Secondary Prevention**. In the context of Rheumatic Heart Disease (RHD), the use of Benzathine Penicillin is aimed at preventing the recurrence of Acute Rheumatic Fever (ARF). Since the patient has already suffered an initial attack or has established heart disease, the goal is to prevent further Group A Streptococcal (GAS) infections that would exacerbate the condition. By definition, secondary prevention involves early diagnosis and treatment to prevent complications or recurrences of a disease already present. **Analysis of Options:** * **Primordial Prevention:** Focuses on preventing the emergence of risk factors (e.g., improving socio-economic conditions and housing to prevent overcrowding). * **Primary Prevention:** Aims at preventing the *first* attack of ARF by treating an initial sore throat (GAS pharyngitis) with antibiotics before it triggers the autoimmune response. * **Tertiary Prevention:** Focuses on limiting disability and rehabilitation in advanced disease (e.g., valve replacement surgery for mitral stenosis). **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** Benzathine Penicillin G (1.2 million units IM every 3–4 weeks) is the gold standard for secondary prophylaxis. * **Duration of Prophylaxis:** * *ARF without Carditis:* 5 years or until age 21 (whichever is longer). * *ARF with Carditis (no valvular disease):* 10 years or until age 21 (whichever is longer). * *ARF with persistent Valvular Disease:* 10 years or until age 40 (sometimes lifelong). * **Jones Criteria:** Used for the diagnosis of the initial attack of ARF (Primary prevention stage).

Question 212: What does CBNAAT stand for?

A. Category Based Nucleic Acid Amplification Test
B. Case Based Nucleic Acid Amplification Test
C. Clinical Based Nucleic Acid Amplification Test
D. Cartridge Based Nucleic Acid Amplification Test (Correct Answer)

Explanation: **Explanation:** **CBNAAT** stands for **Cartridge Based Nucleic Acid Amplification Test**. It is a revolutionary molecular diagnostic tool used primarily for the rapid detection of *Mycobacterium tuberculosis* (MTB) and rifampicin resistance. **Why Option D is Correct:** The technology (commercially known as GeneXpert) utilizes a self-contained, single-use **cartridge** that houses all necessary reagents for DNA extraction, amplification, and detection. Because the entire process occurs within this closed cartridge, it minimizes the risk of cross-contamination and requires minimal laboratory infrastructure, making it a "point-of-care" test. **Why Other Options are Incorrect:** * **Options A, B, and C:** The terms "Category," "Case," and "Clinical" are incorrect prefixes. While CBNAAT is used for clinical diagnosis and case finding, the nomenclature specifically refers to the **method of delivery** (the cartridge system) rather than the clinical application. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** It is a hemi-nested real-time PCR assay that targets the **rpoB gene** of MTB. * **Turnaround Time:** Provides results within **2 hours**, significantly faster than traditional culture (which takes weeks). * **NTEP Guidelines:** Under the National Tuberculosis Elimination Programme (NTEP), CBNAAT is the **preferred first-line diagnostic test** for all presumptive TB cases, especially for pediatric TB, HIV-positive individuals, and extra-pulmonary TB. * **Sensitivity:** It has a much higher sensitivity than sputum smear microscopy, particularly in paucibacillary cases. * **Limitation:** It cannot differentiate between live and dead bacilli; hence, it is not used for monitoring treatment response.

Question 213: Which of the following is a common cause of infective diarrhea?

A. Rotavirus (Correct Answer)
B. Calicivirus
C. Flavivirus
D. Enterovirus

Explanation: **Explanation:** **Rotavirus** is the most common cause of severe, dehydrating diarrhea in infants and young children worldwide. In the context of Community Medicine and Public Health, it is a significant contributor to under-five mortality. It primarily spreads via the fecal-oral route, leading to the destruction of mature enterocytes in the small intestine, which results in malabsorptive and osmotic diarrhea. **Analysis of Options:** * **A. Rotavirus (Correct):** It is the leading cause of infective diarrhea globally in children. The introduction of the Rotavirus vaccine (e.g., Rotavac, Rotarix) in the Universal Immunization Programme (UIP) highlights its public health importance. * **B. Calicivirus:** While this family includes **Norovirus** (a common cause of epidemic gastroenteritis in all ages, often associated with cruise ships or institutional outbreaks), Rotavirus remains the more "common" and clinically significant cause cited in standard textbooks for pediatric diarrhea. * **C. Flavivirus:** This family includes viruses like Dengue, Zika, and Yellow Fever. These are primarily **arthropod-borne** (arboviruses) and present with fever, rash, or hemorrhagic manifestations rather than primary infective diarrhea. * **D. Enterovirus:** While these viruses (like Poliovirus, Coxsackievirus) replicate in the GI tract, they typically cause systemic illnesses (hand-foot-mouth disease, myocarditis, or paralysis) rather than being a primary cause of diarrhea. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Rotavirus produces the **NSP4 enterotoxin**, which induces secretory diarrhea by increasing intracellular calcium. * **Vaccine:** In India, the Rotavirus vaccine is administered at **6, 10, and 14 weeks** (5 drops for Rotavac). * **Seasonality:** In temperate climates, it shows a distinct winter peak ("Winter diarrhea"). * **Management:** The cornerstone of treatment is **ORS and Zinc** supplementation (20mg for 14 days) to reduce the duration and severity.

Question 214: A woman with a Body Mass Index of 20 is classified as:

A. Undernourished
B. Normal weight (Correct Answer)
C. Overweight
D. Obese

Explanation: **Explanation:** The Body Mass Index (BMI), or Quetelet index, is a simple index of weight-for-height that is commonly used to classify underweight, overweight, and obesity in adults. It is defined as the weight in kilograms divided by the square of the height in metres ($kg/m^2$). According to the **World Health Organization (WHO)** classification: * **Normal weight:** BMI ranges from **18.50 to 24.99 $kg/m^2$**. Since the woman in the question has a BMI of 20, she falls squarely within this healthy range. **Analysis of Incorrect Options:** * **Undernourished (Underweight):** This is defined as a BMI **< 18.50 $kg/m^2$**. * **Overweight:** This is defined as a BMI **$\geq$ 25.00 $kg/m^2$** (specifically 25.00–29.99). * **Obese:** This is defined as a BMI **$\geq$ 30.00 $kg/m^2$**. **High-Yield Facts for NEET-PG:** 1. **Asian-Indian Specific Criteria:** Due to a higher risk of metabolic syndrome at lower BMIs, the revised criteria for Indians are: * Normal: 18–22.9 $kg/m^2$ * Overweight: 23–24.9 $kg/m^2$ * Obese: $\geq$ 25 $kg/m^2$ 2. **Ponderal Index:** Another measure of body fat, calculated as $Weight (kg) / Height^3 (m^3)$. 3. **Waist-Hip Ratio:** A significant indicator of central obesity. Risk increases if > 0.9 in men and > 0.85 in women. 4. **Broca’s Index:** A quick bedside formula for Ideal Body Weight (IBW): $Height (cm) - 100$.

Question 215: What is the type of Diphtheria associated with the highest mortality?

A. Pharyngeal
B. Nasal
C. Laryngeal (Correct Answer)
D. Conjunctival

Explanation: ### Explanation **Correct Answer: C. Laryngeal** **Why Laryngeal Diphtheria has the highest mortality:** Laryngeal diphtheria is considered the most dangerous form because it carries a high risk of **acute airway obstruction**. The characteristic "pseudomembrane" (composed of fibrin, WBCs, and dead epithelial cells) can detach or cause significant edema in the narrow subglottic region. This leads to "croupy" cough, inspiratory stridor, and ultimately, asphyxiation. Unlike other forms, the primary cause of death here is often mechanical respiratory failure rather than just systemic toxemia. **Analysis of Incorrect Options:** * **A. Pharyngeal:** This is the **most common** clinical form. While it causes significant systemic toxemia (leading to myocarditis), the risk of immediate mechanical airway death is lower than in the laryngeal type. * **B. Nasal:** This is generally the **mildest** form. It presents with serosanguinous discharge and has low systemic toxin absorption, leading to a very low mortality rate. * **D. Conjunctival:** This is a rare localized form. While it can cause local tissue destruction and corneal scarring, it is rarely fatal. **High-Yield Clinical Pearls for NEET-PG:** * **Causative Agent:** *Corynebacterium diphtheriae* (Gram-positive, club-shaped, Chinese-letter pattern). * **Most Common Site:** Faucial/Pharyngeal. * **Most Fatal Site:** Laryngeal (due to asphyxia). * **The Membrane:** It is a **true pseudomembrane**; attempting to scrape it off results in profuse bleeding. * **Complications:** The most common cause of late death in diphtheria is **Myocarditis** (due to exotoxin). * **Schick Test:** Used to demonstrate the immune status of an individual (susceptibility). * **Drug of Choice:** Erythromycin (to stop toxin production) + Diphtheria Antitoxin (to neutralize circulating toxin).

Question 216: Which of the following complications has been associated with rotavirus vaccine?

A. Guillain-Barré syndrome
B. Hemolytic anemia
C. Febrile seizures
D. Intussusception (Correct Answer)

Explanation: **Explanation:** The correct answer is **Intussusception**. **Why Intussusception is correct:** Intussusception is a condition where one part of the intestine slides into an adjacent part (telescoping), leading to bowel obstruction. Historically, the first rotavirus vaccine (Rotashield) was withdrawn in 1999 due to a strong association with intussusception. Current vaccines (Rotarix and RotaTeq) carry a much lower, but still statistically significant, risk (approximately 1 to 5 cases per 100,000 vaccinated infants). The risk is highest within the first 7 days following the first dose. **Why other options are incorrect:** * **Guillain-Barré syndrome (GBS):** This is most famously associated with the **Influenza vaccine** and *Campylobacter jejuni* infections, not rotavirus. * **Hemolytic anemia:** This is typically an autoimmune or drug-induced reaction (e.g., methyldopa, penicillin) and is not a recognized complication of the rotavirus vaccine. * **Febrile seizures:** While common after the **MMR or DPT** vaccines due to the systemic inflammatory response/fever, they are not a specific or hallmark complication of the oral rotavirus vaccine. **High-Yield Clinical Pearls for NEET-PG:** * **Vaccine Type:** Rotavirus vaccines are **Live Attenuated** oral vaccines. * **Contraindication:** A history of previous intussusception or uncorrected congenital malformation of the GI tract (like Meckel’s diverticulum) is an absolute contraindication. * **Administration:** Under the Universal Immunization Programme (UIP) in India, Rotavirus vaccine (Rotavac) is given at **6, 10, and 14 weeks** (5 drops orally). * **Age Limit:** The first dose should ideally be administered before 15 weeks of age, and the series should be completed by 8 months.

Question 217: What is the incubation period for filariasis?

A. 1 - 8 months
B. 8 - 16 months (Correct Answer)
C. 16 - 24 months
D. More than 24 months

Explanation: **Explanation:** In Lymphatic Filariasis, the **incubation period** refers to the time interval between the entry of infective larvae ($L_3$) via a mosquito bite and the first appearance of clinical signs and symptoms. For *Wuchereria bancrofti*, this period typically ranges from **8 to 16 months**, though it can vary based on the host's immune response and the intensity of infection. * **Why Option B is correct:** The biological development of the parasite from the $L_3$ stage to mature adults, followed by the host's inflammatory response to the adult worms, generally takes approximately 8 to 16 months to manifest clinically as lymphangitis or lymphadenitis. * **Why Options A, C, and D are incorrect:** 1–8 months (Option A) is too short for the parasite to mature and trigger a significant clinical immune response. Periods exceeding 16 months (Options C and D) represent outliers or delayed presentations rather than the standard epidemiological average defined in standard textbooks like Park’s PSM. **High-Yield Clinical Pearls for NEET-PG:** * **Pre-patent Period:** The time between the entry of infective larvae and the first appearance of microfilariae in the blood. For *W. bancrofti*, this is usually **6 to 12 months**. * **Vector:** *Culex quinquefasciatus* is the most common vector in India. * **Drug of Choice:** Diethylcarbamazine (DEC) 6 mg/kg for 12 days. * **Mass Drug Administration (MDA):** Uses a combination of DEC + Albendazole (or IDA: Ivermectin + DEC + Albendazole in specific areas) once a year to interrupt transmission.

Question 218: What is the Clinical GOAL recommended by WHO for Prevention of CAD?

A. Cholesterol / LDL ratio
B. Cholesterol / HDL ratio (Correct Answer)
C. Triglycerides / LDL ratio
D. Triglycerides / HDL ratio

Explanation: ### Explanation **Correct Answer: B. Cholesterol / HDL ratio** The WHO recommends the **Total Cholesterol / HDL ratio** as a primary clinical goal and a powerful predictor of Coronary Artery Disease (CAD) risk. This ratio is often referred to as the **Atherogenic Index**. * **Medical Concept:** Total cholesterol represents all circulating lipoproteins, while HDL (High-Density Lipoprotein) is "good cholesterol" that facilitates reverse cholesterol transport (removing fat from arteries). A high ratio indicates that the pro-atherogenic components outweigh the protective components. According to WHO guidelines, the clinical goal is to keep this ratio **below 3.5 or 4.0**. A ratio above 5.0 indicates a high risk for ischemic heart disease. **Analysis of Incorrect Options:** * **A. Cholesterol / LDL ratio:** While LDL is the "bad cholesterol," the ratio of Total Cholesterol to LDL is not a standard clinical marker because LDL is already a major component of Total Cholesterol; they tend to move in the same direction. * **C. Triglycerides / LDL ratio:** This ratio is sometimes used in research to assess LDL particle size, but it is not a WHO-recommended clinical goal for CAD prevention. * **D. Triglycerides / HDL ratio:** While this is an emerging marker for insulin resistance and metabolic syndrome, it has not replaced the Total Cholesterol/HDL ratio in standard WHO CAD prevention protocols. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of Halves:** In Hypertension/CAD, half the people are unaware, half of those aware are not treated, and half of those treated are not controlled. * **Primary Prevention of CAD:** Focuses on controlling risk factors like smoking, hypertension, and hypercholesterolemia in the general population. * **Serum Cholesterol Levels:** WHO recommends keeping serum cholesterol **<200 mg/dl** for the general population. * **HDL Levels:** Low HDL (**<40 mg/dl**) is an independent risk factor for CAD.

Question 219: In which of the following conditions is post-exposure prophylaxis not useful?

A. Measles
B. Rabies
C. Pertussis (Correct Answer)
D. Hepatitis B

Explanation: **Explanation:** The concept of **Post-Exposure Prophylaxis (PEP)** involves administering vaccines, immunoglobulins, or antibiotics after exposure to a pathogen to prevent the onset of disease. **Why Pertussis is the correct answer:** While antibiotics (like Azithromycin) are given to close contacts of a Pertussis case, this is technically classified as **Post-Exposure Chemoprophylaxis**, not "prophylaxis" in the context of preventing the disease once the incubation period has significantly progressed or through vaccination. More importantly, in the context of standard NEET-PG patterns, Pertussis vaccination is strictly for **primary prevention**. The vaccine takes too long to induce an immune response to be effective after exposure, unlike Measles or Rabies. **Analysis of Incorrect Options:** * **Measles:** Post-exposure vaccination is effective if given within **72 hours** of exposure. Immunoglobulins can be given within **6 days**. * **Rabies:** This is the classic example of PEP. Due to the long incubation period, a combination of Wound Management, Rabies Vaccine, and Rabies Immunoglobulin (RIG) can successfully prevent the disease. * **Hepatitis B:** PEP is standard for needle-stick injuries or sexual exposure, involving the Hepatitis B vaccine and/or Hepatitis B Immunoglobulin (HBIG) within **24 hours** (ideally) to 7 days. **High-Yield Clinical Pearls for NEET-PG:** * **Measles PEP:** Vaccine within 72 hours is the preferred method for outbreaks in susceptible populations. * **Hepatitis A:** PEP is also useful (Vaccine or IG within 14 days). * **Varicella:** PEP with Varicella Zoster Immunoglobulin (VZIG) is effective if given within 96 hours–10 days. * **Tetanus:** Post-injury management is a form of PEP involving TT/Td vaccine and TIG based on wound severity and immunization history.

Question 220: What is the desired parameter for the control of hypertension?

A. Cholesterol/HDL ratio < 3.5 (Correct Answer)
B. HDL/Cholesterol ratio < 3.5
C. LDL/Cholesterol ratio > 10 mg%
D. HDL < 30 mg%

Explanation: **Explanation:** The management of hypertension is intrinsically linked to the assessment of overall cardiovascular risk. The **Cholesterol/HDL ratio** (also known as the Castelli Index) is a powerful predictor of coronary artery disease (CAD). **1. Why Option A is Correct:** The Cholesterol/HDL ratio is calculated by dividing Total Cholesterol by High-Density Lipoprotein (HDL). A lower ratio indicates a lower risk of atherosclerotic plaque formation. For effective control of hypertension and prevention of associated cardiovascular events, the target is to keep this ratio **< 3.5**. A ratio above 5.0 is considered high risk. **2. Analysis of Incorrect Options:** * **Option B (HDL/Cholesterol ratio < 3.5):** This is mathematically inverted. Since HDL is the "good" cholesterol, a higher HDL/Total Cholesterol ratio is actually protective. * **Option C (LDL/Cholesterol ratio > 10 mg%):** This is not a standard clinical parameter for hypertension control. LDL (Low-Density Lipoprotein) is typically measured as an absolute value (Target < 100 mg/dL for most, < 70 mg/dL for high-risk patients). * **Option D (HDL < 30 mg%):** This is a risk factor, not a control target. Low HDL (< 40 mg/dL in men, < 50 mg/dL in women) is a component of Metabolic Syndrome and increases cardiovascular risk. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of Halves in Hypertension:** 1/2 of cases are diagnosed; 1/2 of those diagnosed are treated; 1/2 of those treated are controlled. * **Most common cause of Hypertension:** Essential (Idiopathic) Hypertension (90-95%). * **Target Blood Pressure (JNC 8):** Generally < 140/90 mmHg; for patients with Diabetes or CKD, the target is also < 140/90 mmHg (though some guidelines like ACC/AHA suggest < 130/80 mmHg). * **Modifiable Risk Factors:** High salt intake (> 5g/day), obesity, alcohol, and physical inactivity.

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