Phase 1 · Understand the Body — Why the disease behaves the way it does.
The One-Line Truth
The whole disease in one chain
Everything on this page exists to explain this line.
Coronary artery disease is fatty plaques blocking the arteries that feed the heart muscle, creating a mismatch between oxygen supply and oxygen demand that causes chest pain, heart attacks, and heart failure.
Clogged Fuel Line in a High-Performance Engine
Your coronary arteries are like the fuel injectors feeding a race car engine that runs 24/7 without stopping. The engine (heart muscle) needs constant oxygen-rich fuel to produce power; the fuel lines (coronary arteries) deliver it. Over time, varnish and sludge (oxidized LDL cholesterol and inflammatory buildup) coat the inside of the fuel line, narrowing the channel. At idle or low speeds, enough fuel still gets through and the engine purrs. But when you press the accelerator (exercise or stress), the engine suddenly demands way more fuel than the clogged line can deliver, so it sputters and misfires (ischemia and chest pain). If the line ruptures and clogs completely, fuel stops flowing entirely, the engine seizes up and dies (heart attack). And if the damage is severe enough, even after you clear the clog, the engine's pistons are damaged and it can never run at full power again (heart failure).
AHA/ACC 2021 Chest Pain Guideline · ACC/AHA 2022 Guideline for Management of Patients With Chronic Coronary Disease · AHA/ACC 2020 Guideline on Management of Patients With Non-ST-Elevation Acute Coronary Syndromes · ACC/AHA 2023 Acute Coronary Syndrome Guideline · reviewed 2026-08-29