Question
Which amongst the following is the most powerful independent risk factor for atherosclerosis?
| A. | Age |
| B. |
Hypertension |
| C. |
Gender |
| D. |
Physical Activity |
Show Answer
|
Correct Answer » B Explanation |
 |
- Atherosclerosis is a chronic inflammatory disease characterized by the accumulation of lipids, inflammatory cells, and fibrous elements within the arterial walls.
- It leads to vascular narrowing, reduced blood flow, and increased risk of cardiovascular events like myocardial infarction (MI) and stroke.
- Several risk factors contribute to atherosclerosis, but some are more significant than others.
Why Hypertension is the Most Powerful Independent Risk Factor:
- Hypertension (high blood pressure) directly damages the arterial endothelium, making it more prone to lipid deposition and inflammation.
- Increased shear stresson vessel walls promotes:
- Endothelial dysfunction
- Increased permeability to lipoproteins
- Smooth muscle cell proliferation → plaque formation
- Inflammatory cell recruitment (monocytes, macrophages)
- Hypertension is strongly linked to:Even mild hypertension significantly increases cardiovascular risk.
- Coronary artery disease (CAD)
- Stroke
- Peripheral artery disease (PAD)
Evidence Supporting Hypertension as the Strongest Risk Factor:
- Framingham Heart Study showed that hypertension alone doubles or triples the risk of cardiovascular events.
- Reducing blood pressure (with antihypertensive therapy) significantly reduces the risk of MI and stroke.
Why Other Options Are Incorrect:
A. Age
- Aging is a non-modifiable risk factor but does not independently cause atherosclerosis.
- Atherosclerosis progresses with age, but hypertension accelerates the process.
C. Gender
- Men have a higher risk of atherosclerosis compared to premenopausal women due to protective effects of estrogen.
- However, after menopause, the risk equalizes between genders.
- Not an independent risk factor, as other factors (e.g., hypertension, smoking, diabetes) modify its impact.
D. Physical Activity
- Sedentary lifestyle is a risk factor, but not as strong as hypertension.
- Regular exercise reduces risk by improving lipid profiles, lowering blood pressure, and enhancing endothelial function.
- Lack of physical activity alone does not cause atherosclerosis without other contributing factors.
