CHA₂DS₂-VASc Calculator
Assess stroke risk in atrial fibrillation patients for anticoagulation decisions
Assess Stroke Risk Factors
Signs/symptoms with objective evidence (e.g., reduced EF on echo)
BP >140/90 mmHg on two occasions or current antihypertensive treatment
Age 65-74 years (1 point), ≥75 years (2 points)
Current insulin/antidiabetic drugs or fasting glucose >125 mg/dL
Prior stroke, TIA, thromboembolism, or cerebral ischemia (2 points)
Prior MI, peripheral artery disease, or aortic plaque
Female sex (1 point only if other risk factors present)
CHA₂DS₂-VASc Score Results
Patient has isolated atrial fibrillation with very low stroke risk
Recommendation: No oral anticoagulation required
Score Breakdown
Example Assessment
Patient Example
Patient: 68-year-old female with atrial fibrillation
Medical History: Hypertension, no diabetes
No history of: CHF, stroke/TIA, vascular disease
Score Calculation
• Age 65-74: +1 point
• Hypertension: +1 point
• Female gender: +1 point
Total Score: 3 points
High Risk: Oral anticoagulation recommended
Annual stroke risk: 3.2%
Risk Stratification
*Score 1 in females only if isolated AF (no other risk factors)
Annual Stroke Risk by Score
CHA₂DS₂-VASc Acronym
Medical Disclaimer
This calculator is for educational purposes only and should not replace professional medical advice. The CHA₂DS₂-VASc score is a clinical decision support tool that must be interpreted by qualified healthcare professionals. Individual patient factors, bleeding risk assessment (HAS-BLED score), and clinical judgment should always guide anticoagulation decisions. Always consult with a cardiologist or healthcare provider before starting or stopping anticoagulant therapy.
Understanding CHA₂DS₂-VASc Score
What is CHA₂DS₂-VASc?
The CHA₂DS₂-VASc score is a clinical prediction rule for estimating the risk of stroke in patients with atrial fibrillation. It helps clinicians decide whether anticoagulant therapy is warranted to prevent thromboembolic complications.
When to Use
- •All patients with atrial fibrillation
- •Before starting anticoagulation therapy
- •Annual reassessment of stroke risk
- •Combined with bleeding risk assessment
Clinical Applications
Low Risk (0-1 points)
No anticoagulation required
Moderate Risk (1 point male)
Consider anticoagulation
High Risk (≥2 points)
Anticoagulation recommended
Important: Always assess bleeding risk using HAS-BLED score alongside CHA₂DS₂-VASc
Key Clinical Considerations
Risk Factor Details
- • CHF: Objective evidence required (echo, clinical signs)
- • HTN: BP >140/90 on two occasions or on treatment
- • Age: 65-74 years (1 pt), ≥75 years (2 pts)
- • DM: On treatment or fasting glucose >125 mg/dL
- • Female: Only counts if other risk factors present
Treatment Considerations
- • Score >2: Strong indication for anticoagulation
- • Score 1 (male): Individual assessment needed
- • Consider bleeding risk (HAS-BLED score)
- • Patient preferences and contraindications
- • Regular monitoring and reassessment