Definition of Atherosclerotic Cardiovascular Disease (ASCVD)
ASCVD encompasses all clinical conditions of atherosclerotic origin, including acute coronary syndrome, myocardial infarction, stable or unstable angina, coronary artery disease documented by angiography, any coronary or arterial revascularization procedure, stroke, transient ischemic attack, documented carotid disease, peripheral artery disease, and abdominal aortic aneurysm. 1, 2, 3
Specific Conditions Included in ASCVD
Coronary Manifestations
- Acute coronary syndrome (ACS) - encompasses unstable angina and myocardial infarction 1, 2, 3
- History of myocardial infarction (MI) - both recent and remote events 2, 3
- Stable angina - chronic coronary syndrome with documented ischemia 1
- Unstable angina - acute presentation without biomarker elevation 2, 3
- Coronary artery disease documented by angiography - regardless of symptom status 1
Revascularization Procedures
- Coronary artery bypass graft surgery (CABG) - any prior surgical revascularization 1
- Percutaneous coronary intervention (PCI) - including stenting or angioplasty 3
- Femoral-popliteal bypass surgery - lower extremity arterial reconstruction 1
- Any other arterial revascularization - carotid endarterectomy, renal artery stenting, etc. 2, 1
Cerebrovascular Manifestations
- Ischemic stroke - documented cerebrovascular accident of atherosclerotic origin 1, 2, 3
- Transient ischemic attack (TIA) - temporary neurological deficit from vascular insufficiency 2, 3
- Documented carotid disease - includes significant stenosis even if asymptomatic 1
Peripheral Vascular Manifestations
- Peripheral artery disease (PAD) - includes symptomatic claudication and documented arterial insufficiency 2, 3
- Abdominal aortic aneurysm - when of atherosclerotic origin 1, 2, 3
Important Clinical Distinctions
What ASCVD Is NOT
The definition specifically requires that all conditions be of atherosclerotic origin 2, 3, 4. This distinction is critical because:
- Heart failure alone is not ASCVD unless it results from ischemic heart disease 3
- Atrial fibrillation is not ASCVD unless associated with coronary disease 5
- Valvular disease is not ASCVD unless atherosclerotic in etiology 6
- Cardiomyopathy is not ASCVD unless ischemic in origin 5
ASCVD vs. Statin-Indicated Conditions
A critical distinction exists between ASCVD and "statin-indicated conditions" 1. While all ASCVD qualifies for statin therapy, statin-indicated conditions also include high-risk primary prevention scenarios without established ASCVD:
- Diabetes mellitus (most patients) 1
- Chronic kidney disease (CKD) 1
- LDL-C ≥5.0 mmol/L (≥190 mg/dL) 1
- Familial hypercholesterolemia 1
These conditions carry high cardiovascular risk but do not constitute ASCVD until an atherosclerotic event occurs 1.
Clinical Implications
Risk Stratification
Patients with any manifestation of ASCVD are automatically classified as secondary prevention candidates, requiring the most intensive risk factor modification 1. The presence of ASCVD supersedes risk calculators and mandates aggressive lipid-lowering therapy regardless of baseline cholesterol levels 2, 3, 5.
Very High-Risk ASCVD
Within the ASCVD population, "very high-risk" designation applies to those with 3:
- Multiple major ASCVD events (e.g., MI plus stroke) 3
- One major ASCVD event plus multiple high-risk conditions such as diabetes, CKD, heart failure, age ≥65 years, hypertension, current smoking, or persistently elevated LDL-C despite maximal therapy 3
- Recent ACS within the past 12 months 3
Common Pitfalls to Avoid
Do not confuse subclinical atherosclerosis with clinical ASCVD 6. Coronary artery calcium scores, carotid intima-media thickness, or asymptomatic plaques on imaging do not constitute ASCVD—they are risk enhancers for primary prevention but do not qualify patients for secondary prevention status 6, 7.
Do not assume all cardiovascular conditions are ASCVD 8, 4. Always verify the atherosclerotic origin of the condition, particularly for heart failure, arrhythmias, and valvular disease 8, 5.