Types of Coronary Artery Disease

Doctors divide coronary artery disease by how the plaque behaves - quietly, predictably, or explosively. The types form a spectrum from silent buildup to heart attack, and knowing where a person stands drives every decision.

Silent (asymptomatic) CAD

Plaque is present and growing but produces no symptoms - either the narrowing is mild, or (in diabetics) nerve damage muffles the pain signals. Found on screening tests: stress tests, CT angiography, or calcium scoring. Silent does not mean safe - it means the opportunity to act BEFORE symptoms.

Stable angina (chronic coronary syndrome)

Predictable chest discomfort on a predictable amount of effort - the same staircase, the same slope - easing within minutes of rest. The plaque is narrowed but stable. Managed with medicines and lifestyle; procedures (stenting) when symptoms limit life or disease is extensive. Stable angina can persist safely for years under good treatment - or destabilize, which is why pattern changes matter.

Unstable angina

Angina that changes character: occurs at rest, with less effort than before, lasts longer, or is new and severe. The plaque has cracked; a clot is forming but has not fully blocked the artery. This is a medical emergency - the last warning before a heart attack.

Heart attack (myocardial infarction) - two technical types

• STEMI: complete artery blockage with specific ECG changes - the full heart attack, needing emergency reopening of the artery (angioplasty or clot-dissolving medicine) within hours
• NSTEMI: partial/temporary blockage - heart muscle is damaged (blood tests prove it) but the artery is not fully sealed; urgent hospital care and early angiography Both are emergencies; both mean 102/108.

Vasospastic (Prinzmetal) angina

A rarer type: the artery itself spasms and squeezes shut temporarily - pain often at rest, at night, in younger patients and smokers. Diagnosed on ECG during episodes; treated with specific vessel-relaxing medicines, and smoking cessation is non-negotiable.

One-line summary

CAD runs from silent plaque through stable angina to unstable angina and heart attack (STEMI and NSTEMI), with vasospastic angina as the rare spasm variant - the type decides the urgency and the treatment.