Non-Communicable Diseases Practice Questions

Q: Smoking is not a risk factor for which of the following conditions?

Alzheimer's disease. **Explanation:** The correct answer is **Alzheimer’s disease**. While historical, industry-funded studies once suggested a "protective" effect of nicotine, modern evidence-based medicine confirms that smoking is a significant risk factor for Alzheimer’s disease and vascular dementia. Smoking increases oxidative stress and neuroinflammation, which accelerates the deposition of amyloid plaques and tau tangles. **Why the other options are wrong:** * **Lung Carcinoma:** This is the most well-established association. Smoking is responsible for approximately 90% of lung cancer cases due to the presence of potent carcinogens like polycyclic aromatic hydrocarbons and nitrosamines. * **Osteoporosis:** Smoking is a recognized risk factor for decreased bone mineral density. It interferes with calcium absorption, reduces Vitamin D levels, and has a direct toxic effect on osteoblasts. In women, it also accelerates the metabolism of estrogen, leading to earlier menopause and bone loss. * **Nonunion of Bones:** Smoking causes peripheral vasoconstriction (via nicotine) and increases carboxyhemoglobin levels, leading to tissue hypoxia. This impairs the revascularization and collagen synthesis necessary for fracture healing, significantly increasing the risk of delayed union or nonunion. **NEET-PG High-Yield Pearls:** * **The "Smoker’s Paradox":** Smoking is associated with a *decreased* risk of **Endometrial Cancer** (due to anti-estrogenic effects), **Ulcerative Colitis**, and **Parkinson’s Disease**. * **Cancers NOT linked to smoking:** Most cancers are linked, but **Prostate Cancer** and **Breast Cancer** have inconsistent or weak associations compared to others. * **Buerger’s Disease (Thromboangiitis obliterans):** A classic "must-know" condition where smoking is the primary etiological factor.

Q: Which of the following is a modifiable risk factor for hypertension?

Obesity. ### Explanation **Correct Answer: D. Obesity** In epidemiology, risk factors for Non-Communicable Diseases (NCDs) like hypertension are categorized into two groups: **Modifiable** and **Non-modifiable**. **Why Obesity is Correct:** Obesity is a **modifiable risk factor** because it can be altered, controlled, or eliminated through lifestyle interventions (dietary changes and physical activity). Pathophysiologically, obesity increases blood pressure through mechanisms such as activation of the Renin-Angiotensin-Aldosterone System (RAAS), increased sympathetic nervous system activity, and insulin resistance. Reducing Body Mass Index (BMI) is one of the most effective non-pharmacological ways to lower blood pressure. **Why Other Options are Incorrect:** * **A, B, and C (Ethnicity, Age, and Sex):** These are **non-modifiable risk factors**. They are inherent biological or demographic characteristics that cannot be changed by medical intervention or lifestyle modification. * **Age:** Blood pressure typically rises with age due to increased arterial stiffness. * **Sex:** Males are generally at higher risk until menopause, after which the risk in females equals or exceeds that of males. * **Ethnicity:** Certain ethnic groups (e.g., African Americans) show a higher prevalence and severity of hypertension. **High-Yield Clinical Pearls for NEET-PG:** * **Most common modifiable risk factor:** While obesity is a major driver, **High Salt Intake** (>5g/day) is frequently cited as a primary dietary trigger in the Indian context. * **Rule of Halves:** Only half of the people with hypertension are diagnosed; only half of those diagnosed are treated; and only half of those treated are controlled. * **Target BMI:** For the Indian population, the goal is to maintain a BMI between **18.5–22.9 kg/m²**. * **Waist Circumference:** A high-yield indicator for metabolic risk in Indians is >90 cm for men and >80 cm for women.

Q: The 'Rule of Halves' is primarily related to which of the following?

Hypertension. **Explanation:** The **'Rule of Halves'** is a classic epidemiological concept used to describe the status of **Hypertension** management in a community. It highlights the significant gap between the prevalence of the disease and its effective control. **The Rule states that:** * **Half** of the people with high blood pressure are **not known** (undiagnosed). * **Half** of those known to have hypertension are **not on treatment**. * **Half** of those receiving treatment do **not have their blood pressure controlled** to target levels. This concept emphasizes that only about **1/8th (12.5%)** of the hypertensive population in a community actually achieves adequate therapeutic control. **Analysis of Incorrect Options:** * **Obesity:** While obesity is a major risk factor for hypertension, it does not follow the "Rule of Halves." Assessment usually involves BMI or waist-hip ratios. * **Burns:** The "Rule of Nines" (Wallace Rule) is used in burns to estimate the Total Body Surface Area (TBSA) involved, not the Rule of Halves. * **Blindness:** Blindness statistics are tracked via prevalence rates and the "WHO Vision 2020" targets, but no "Rule of Halves" is applied to its epidemiology. **High-Yield Pearls for NEET-PG:** * **Iceberg Phenomenon:** Hypertension is a classic example of the "Iceberg of Disease," where the diagnosed cases represent only the tip, and the undiagnosed cases represent the submerged portion. * **Screening:** Hypertension screening is a form of **Secondary Prevention**. * **Tracking:** The phenomenon where a child’s BP stays in the same percentile as they grow is called "Tracking of Blood Pressure." * **Rule of Halves** is also occasionally discussed in the context of other chronic "silent" diseases like Diabetes, but it is classically and primarily associated with **Hypertension** in standard textbooks (Park’s PSM).

Q: What is the Body Mass Index (BMI) criterion for morbid obesity?

Greater than 40. **Explanation:** The classification of obesity is based on the **Body Mass Index (BMI)**, calculated as weight in kilograms divided by the square of height in meters ($kg/m^2$). According to the World Health Organization (WHO) and standard clinical guidelines, **Morbid Obesity (Class III Obesity)** is defined as a **BMI > 40 $kg/m^2$**. This stage represents a critical level of adiposity where the risk of life-threatening comorbidities (such as Type 2 Diabetes, Obstructive Sleep Apnea, and Cardiovascular Disease) increases exponentially. **Analysis of Options:** * **Option B (Correct):** BMI > 40 is the threshold for Morbid Obesity. It is also the criteria for considering bariatric surgery in patients without other comorbidities. * **Option A:** BMI > 30 is the general threshold for **Obesity (Class I)**. * **Option C:** BMI > 35 is classified as **Class II Obesity** (Severe Obesity). * **Option D:** BMI > 29 (specifically 25–29.9) is categorized as **Overweight**. **High-Yield Clinical Pearls for NEET-PG:** 1. **Asian-Indian Specific Criteria:** Due to a higher risk of metabolic syndrome at lower BMIs, the criteria for Indians are lower: * Overweight: 23–24.9 $kg/m^2$ * Obesity: $\ge$ 25 $kg/m^2$ 2. **Ponderal Index:** Unlike BMI, this uses the cube of height ($kg/m^3$) and is a more sensitive indicator for fetal growth. 3. **Waist-Hip Ratio:** A high-yield marker for "Central Obesity." Significant if **> 0.9 in men** or **> 0.85 in women**. 4. **Quetelet's Index:** Another name for the Body Mass Index.

Q: A 20-year-old male is found to have blood pressures of 134/82 mmHg and 136/83 mmHg on two separate occasions. How will he be classified?

High normal BP. ### Explanation The classification of blood pressure (BP) in this case is based on the **JNC-7** and **WHO/ISH** guidelines, which are frequently tested in NEET-PG. **1. Why "High Normal BP" is correct:** According to the WHO/ISH classification, **High Normal BP** is defined as a Systolic BP (SBP) of **130–139 mmHg** and/or a Diastolic BP (DBP) of **85–89 mmHg**. In this patient, the readings (134/82 and 136/83) fall squarely within the systolic range for High Normal BP. Even if only one value (systolic or diastolic) falls into a higher category, the higher value determines the classification. **2. Why other options are incorrect:** * **Normotensive:** Normal BP is defined as SBP **<120 mmHg** and DBP **<80 mmHg**. This patient’s readings exceed these limits. * **Stage 1 Hypertension:** This requires an SBP of **140–159 mmHg** or a DBP of **90–99 mmHg**. The patient's readings are below this threshold. * **Stage 2 Hypertension:** This is defined as SBP **≥160 mmHg** or DBP **≥100 mmHg**. **High-Yield Clinical Pearls for NEET-PG:** * **JNC-7 vs. ACC/AHA 2017:** While JNC-7 uses "Pre-hypertension" (120–139/80–89), the WHO classification uses "High Normal." Note that the **2017 ACC/AHA guidelines** (often used in clinical practice) would classify this patient as **Stage 1 Hypertension** (130–139/80–89), but for Community Medicine exams, stick to the WHO/JNC-7 definitions unless specified otherwise. * **Diagnosis Rule:** Hypertension should be diagnosed based on the average of **two or more** properly measured readings on **two or more** separate occasions. * **Rule of Halves:** 1/2 of cases are known, 1/2 of known cases are treated, and 1/2 of treated cases are controlled.

Q: Cataract blindness is:

Curable. ### Explanation **Correct Answer: B. Curable** **1. Why "Curable" is the Correct Answer:** In the context of Community Ophthalmology and WHO classifications, blindness is categorized based on the nature of intervention required. **Cataract** is the leading cause of **curable blindness** worldwide. It is considered "curable" because the visual loss is reversible through a one-time surgical intervention (Lens extraction with IOL implantation). Once the opaque lens is replaced, the anatomical pathway for light is restored, and the patient regains vision. **2. Analysis of Incorrect Options:** * **A. Preventable:** Preventable blindness refers to conditions that can be stopped before they occur (e.g., Xerophthalmia via Vitamin A supplementation or Trachoma via hygiene). Cataract is an age-related degenerative process; we cannot currently "prevent" the lens from opacifying over time. * **C. Avoidable:** This is a broad term that encompasses both *preventable* and *curable* blindness. While cataract is a component of avoidable blindness, "Curable" is the more specific and standard epidemiological classification for it. * **D. Curable and Avoidable:** While technically true in a general sense, in competitive exams like NEET-PG, you must choose the most specific clinical category. Cataract is the prototype for "Curable Blindness." **3. High-Yield Clinical Pearls for NEET-PG:** * **Avoidable Blindness:** Includes Cataract, Refractive errors, Trachoma, and Diabetic Retinopathy. * **Preventable Blindness:** Includes Xerophthalmia, Ophthalmia neonatorum, and Trachoma. * **NPCBVI (National Programme for Control of Blindness & Visual Impairment):** The current target is to reduce the prevalence of blindness to **0.25%** by 2025. * **Leading Cause of Blindness in India:** Cataract (66.2%), followed by Refractive Errors. * **Definition of Blindness (WHO/NPCBVI):** Visual acuity < 3/60 in the better eye with best possible correction.

Q: How does the World Health Organization (WHO) define blindness?

VA < 3/60. ***VA < 3/60*** - This visual acuity (VA) level in the better eye, with the best possible correction, meets the World Health Organization (WHO) definition of **blindness** (Visual Impairment Category 3 or worse). - It signifies that the patient cannot count fingers at a distance of 3 meters (CF 3/60* - Visual acuity *greater* than 3/60 (e.g., 6/60, 6/18) indicates better visual function and therefore does not satisfy the criteria for WHO **blindness**. - Depending on the exact VA, this level of vision may fall into the categories of **moderate** or **mild visual impairment**. *VA > 6/60* - Visual acuity greater than 6/60 (e.g., 6/12) is well above the threshold defined for both **severe visual impairment** and blindness. - An acuity of 6/60 is often the benchmark for severe impairment; vision better than this suggests residual useful vision.

Q: According to the population strategy for prevention of coronary artery disease, what is the recommended dietary cholesterol intake limit per day?

100 mg / 1000 kcal. ***100 mg / 1000 kcal*** - The **population strategy** or public health approach aims to shift the entire risk distribution in the population. - A recommended target for **dietary cholesterol** intake for the general population is often set at less than **100 mg per 1000 kcal** (or <300 mg/day absolute limit). *200 mg / 1000 kcal* - While lower than average intake, setting the limit at **200 mg / 1000 kcal** might not be stringent enough for achieving optimal **population-wide reduction** in **CAD risk**. - This limit may be closer to recommendations for individuals with pre-existing risk factors, but not the general population strategy goal. *400 mg / 1000 kcal* - An intake of **400 mg / 1000 kcal** is considered high and would exceed the recommended limits for **primary prevention** of **coronary artery disease (CAD)**. - High cholesterol intake is directly linked to increased **serum LDL levels** in many individuals. *500 mg / 1000 kcal* - **500 mg / 1000 kcal** significantly exceeds public health recommendations and is associated with a high risk of hypercholesterolemia and subsequent development of **atherosclerosis**. - The goal of the population strategy is to move the average consumption far below this level to benefit the whole community.

Question 1

Smoking is not a risk factor for which of the following conditions?

Accepted Answer

Alzheimer's disease

Answer

Lung carcinoma

Answer

Osteoporosis

Answer

Nonunion of bones

Question 2

Innovation of refrigeration leading to better food preservation has led to a decrease in the incidence of which of the following malignancies?

Accepted Answer

Stomach

Answer

Esophagus

Answer

Colon

Answer

Oropharyngeal

Question 3

Which of the following is a modifiable risk factor for hypertension?

Accepted Answer

Obesity

Answer

Ethnicity

Answer

Age

Answer

Sex

Question 4

The 'Rule of Halves' is primarily related to which of the following?

Accepted Answer

Hypertension

Answer

Obesity

Answer

Burns

Answer

Blindness

Question 5

What is the Body Mass Index (BMI) criterion for morbid obesity?

Accepted Answer

Greater than 40

Answer

Greater than 30

Answer

Greater than 35

Answer

Greater than 29

Question 6

Arrange the following causes of NCD deaths as per decreasing order of frequency: Cancers, Cardiovascular diseases, Diabetes, Respiratory diseases?

Accepted Answer

Cardiovascular diseases > Cancers > Respiratory diseases > Diabetes

Answer

Cancers > Respiratory diseases > Diabetes > Cardiovascular diseases

Answer

Respiratory diseases > Cancers > Cardiovascular diseases > Diabetes

Answer

Diabetes > Cardiovascular diseases > Respiratory diseases > Cancers

Question 7

A 20-year-old male is found to have blood pressures of 134/82 mmHg and 136/83 mmHg on two separate occasions. How will he be classified?

Accepted Answer

High normal BP

Answer

Normotensive

Answer

Stage 1 hypertension

Answer

Stage 2 hypertension

Question 8

Cataract blindness is:

Accepted Answer

Curable

Answer

Preventable

Answer

Avoidable

Answer

Curable and avoidable

Question 9

How does the World Health Organization (WHO) define blindness?

Accepted Answer

VA < 3/60

Answer

VA < 6/60

Answer

VA > 3/60

Answer

VA > 6/60

Question 10

According to the population strategy for prevention of coronary artery disease, what is the recommended dietary cholesterol intake limit per day?

Accepted Answer

100 mg / 1000 kcal

Answer

500 mg / 1000 kcal

Answer

200 mg / 1000 kcal

Answer

400 mg / 1000 kcal

Non-Communicable Diseases — MCQs

Non-Communicable Diseases — MCQs

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