Coronary Artery Disease: Risk Factors and Prevention Strategies

1. Central Adiposity: An enlarged waist circumference.
2. Elevated Triglycerides: $\ge 150 \text{ mg/dL}$.
3. Low HDL Cholesterol: $<40 \text{ mg/dL}$ in males or $<50 \text{ mg/dL}$ in females.
4. Elevated Blood Pressure: $\ge 130/80 \text{ mmHg}$ (or currently being treated).
5. Elevated Fasting Glucose: $\ge 100 \text{ mg/dL}$ (or currently being treated).

Assessing Risk: The Framingham Risk Calculator

To move from qualitative assessment to quantitative prediction, clinicians use tools like the Framingham Risk Calculator. This tool estimates a patient's 10-year probability of experiencing a major cardiac event. The calculation incorporates several key variables:

• Age and Sex
• Systolic Blood Pressure
• Smoking history
• Total and HDL cholesterol levels
• Use of antihypertensive medications

Prevention Strategies: Lifestyle Modifications

Prevention is centered on reducing the burden on the coronary arteries through behavioral changes.

Tobacco Cessation

Smoking is a major contributor to CAD severity. Nicotine triggers the release of catecholamines, which increases both heart rate and blood pressure. Furthermore, nicotine increases the oxidation of LDL, which damages the vascular endothelium, while the inhalation of carbon monoxide reduces the overall oxygen supply available to the myocardium.

Dietary and Physical Activity Changes

Adopting a heart-healthy diet is essential. The American Heart Association (AHA) and the Mediterranean diet are highly recommended; these emphasize plant foods, fish, and minimally processed foods while limiting red meat, sweets, and sugar-sweetened beverages.

Physical activity should be structured to improve cardiovascular efficiency. Guidelines suggest:

• Moderate Aerobic Activity: At least $150 \text{ minutes/week}$.
• Vigorous Aerobic Activity: At least $75 \text{ minutes/week}$.
• Muscle Strengthening: $\ge 2$ days per week.

Lipid Management and Pharmacological Interventions

Managing lipids is a cornerstone of CAD prevention. We aim to decrease LDL ("bad" cholesterol), which contributes to plaque formation, and increase HDL ("good" cholesterol), which helps transport lipids back to the liver.

When lifestyle changes are insufficient, several classes of medications may be prescribed to alter lipoprotein metabolism:

Exam Tip: If a question asks which medication class is most effective at reducing both LDL and total cholesterol while also providing a slight increase in HDL, the answer is likely a Statin (HMG-CoA Reductase Inhibitor).

By combining aggressive lifestyle modifications with targeted pharmacological therapy, the progression of coronary artery disease can be slowed, and the risk of catastrophic cardiac events can be significantly reduced.