Which of the following is a nonmodifiable risk factor for coronary hea disease?
**Core Concept**
Age is a significant risk factor for coronary heart disease (CHD) due to its association with the accumulation of atherosclerotic plaque over time. As people age, their risk of developing CHD increases, largely due to the progressive hardening and narrowing of the arteries.
**Why the Correct Answer is Right**
The correct answer is D. Age, as it is a nonmodifiable risk factor for CHD. Nonmodifiable risk factors are those that cannot be changed or controlled by the individual, such as age, sex, and family history. Age-related increases in CHD risk are attributed to the gradual decline in cardiovascular health, including decreased vasodilatory capacity, increased vascular stiffness, and enhanced inflammatory responses. These age-related changes contribute to the development of atherosclerosis, a key underlying mechanism of CHD.
**Why Each Wrong Option is Incorrect**
**Option A:** Cigarette smoking is a modifiable risk factor for CHD, as quitting or avoiding smoking can significantly reduce an individual's risk of developing the disease. Smoking is a major contributor to CHD, primarily through its induction of oxidative stress and inflammation within the vascular wall.
**Option B:** Elevated serum cholesterol is a modifiable risk factor for CHD, as lifestyle modifications (e.g., dietary changes) and pharmacological interventions (e.g., statins) can effectively lower cholesterol levels and reduce CHD risk.
**Option C:** Alcoholism is a modifiable risk factor for CHD, as moderate alcohol consumption (up to one drink per day for women and two drinks per day for men) may even provide some cardiovascular benefits, whereas excessive alcohol consumption can increase CHD risk.
**Clinical Pearl / High-Yield Fact**
It is essential to recognize that age is a nonmodifiable risk factor for CHD, and thus, prevention and management strategies should focus on modifiable risk factors, such as smoking cessation, healthy diet, regular physical activity, and stress management.
**Correct Answer Line**
✓ Correct Answer: D. Age