Atherosclerosis & Risk Factor Modification

Most MIs don't start with chest pain — they start years earlier with modifiable risk factors the nurse could have addressed. Knowing which factors matter most changes outcomes.

Atherosclerosis is a progressive inflammatory process where lipid-laden plaques build up in arterial walls, narrowing the lumen and setting the stage for every condition in the CAD/ACS cluster. The process begins with endothelial injury from hypertension, smoking, hyperglycemia, or hyperlipidemia. Monocytes migrate into the vessel wall, engulf oxidized LDL, and form foam cells — the fatty streak. Over decades, a fibrous cap forms over the lipid core. A stable plaque narrows flow gradually; a vulnerable plaque with a thin cap can rupture suddenly, triggering thrombus formation and acute coronary events. Risk factors split into two categories. Non-modifiable: age (men ≥45, women ≥55), male sex, and family history of premature CAD (first-degree male relative <55 or female <65). Modifiable: hypertension, dyslipidemia (target LDL <100 mg/dL for high-risk patients, <70 for very high-risk), diabetes, smoking, obesity (BMI ≥30), sedentary lifestyle, and metabolic syndrome. Nursing interventions center on aggressive lifestyle teaching — smoking cessation (single greatest modifiable factor), 150 minutes/week of moderate exercise, DASH or Mediterranean diet, weight management, and adherence to prescribed statins and antihypertensives. The nurse monitors lipid panels, HbA1c, blood pressure trends, and readiness to change.

Key Distinctions

Don't confuse atherosclerosis (plaque buildup in arteries) with arteriosclerosis (general arterial wall stiffening/hardening) — atherosclerosis is one type of arteriosclerosis. Students often rank diabetes or obesity as the top modifiable risk factor, but smoking is number one for CAD risk reduction impact. Non-modifiable risk factors cannot generate nursing interventions — they only stratify risk level. If a question stem highlights family history, don't select a teaching intervention for it; focus on the modifiable factor instead.

Clinical Pearl

Think of plaque like a pimple under the skin: a thick cap stays quiet, but a thin-capped one ruptures without warning — that rupture is what turns stable CAD into an acute MI.