Plaque, Atherosclerosis & Silent Heart Disease: What You Cannot Feel Can Still Kill You

Atherosclerosis involves the progressive build-up of plaque — composed of cholesterol, inflammatory cells, calcium, and fibrous material — inside arterial walls. The process begins with microscopic damage to the artery's inner lining (endothelium), caused by elevated LDL cholesterol, high blood pressure, smoking, diabetes, or persistent inflammation. Following endothelial injury, LDL particles penetrate the arterial wall. Immune cells accumulate, become filled with lipid material, and form foam cells — the foundation of nascent plaque. Throughout years, this mechanism progresses undetected: plaque expands, gathers calcium, develops a fibrous layer, and gradually reduces the arterial opening. The artery remodels outward as plaque accumulates, preserving an approximately normal inner diameter for extended periods. Blood circulates normally. The individual experiences nothing.

The most dangerous plaque is frequently not the most obstructive variety. Evidence shows that plaques prone to rupture typically narrow the artery by only 40–60%, not the severe 90% narrowing that produces chest pain on a stress test. Unstable plaques have a large fat-filled interior, a thin protective coating, and vigorous inflammatory activity. When the coating ruptures, the fat interior contacts blood, causing rapid clot formation — complete arterial closure — within minutes. This is a STEMI. Frequently, patients had no prior chest pain, no abnormal baseline ECG, and no positive stress test. The first warning was the heart attack itself. This is why conventional stress testing — excellent at finding flow-limiting narrowing — does not reliably identify those at greatest risk of sudden cardiac events.

Silent coronary disease affects more people than commonly recognised. The key cumulative risk factors are:

Contemporary cardiovascular medicine provides several research-supported methods for identifying undetected atherosclerosis before symptoms develop. Coronary Artery Calcium (CAC) Scoring uses a low-radiation CT scan to quantify calcified plaque in coronary arteries — no contrast, no needles. A zero score carries very low cardiac event risk over the next decade and may support deferring statin therapy with close monitoring. Scores above 300 suggest substantial plaque burden and warrant intensive preventive therapy regardless of traditional risk profile. CAC is the single strongest non-invasive predictor of future cardiac events in asymptomatic individuals.

CT Coronary Angiography (CTCA) provides superior anatomical visualisation of both calcified and non-calcified plaque, evaluates narrowing degree, and detects high-risk plaque characteristics including lipid-rich areas. CT-FFR can assess whether a lesion actually disrupts blood flow — without cardiac catheterisation. Carotid Intima-Media Thickness (IMT), measured via ultrasound, detects subclinical vascular disease in the neck as an indicator of systemic atherosclerosis. Lipoprotein(a) [Lp(a)] testing should be done at least once in anyone with early-onset heart disease, a strong family history, or unexplained high CAC despite well-controlled conventional risk factors.

Atherosclerosis is not inevitable — it responds to early intervention. LDL reduction forms the foundation: statins decrease plaque expansion and critically stabilise unstable plaque by thickening the fibrous cap and shrinking the lipid core. Managing blood pressure, stopping smoking, controlling blood sugar, and maintaining a healthy weight address the primary mechanisms of endothelial injury. For individuals with elevated Lp(a), aggressive LDL management provides partial benefit while newer RNA-based therapies targeting Lp(a) are advancing through trials. The goal is preventing the first event entirely — not treating it after the fact.

A cardiovascular assessment with subclinical atherosclerosis screening merits consideration if you have any of the following: a close family member with heart attack or coronary procedure before age 60; a personal history of high blood pressure, diabetes, or high cholesterol; a previously elevated CAC score; persistently elevated cholesterol despite lifestyle changes; or unexplained breathlessness or fatigue without a clear non-cardiac explanation.