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CHA₂DS₂-VASc Stroke Risk Calculator

Estimates stroke risk in patients with atrial fibrillation to guide anticoagulation therapy

Select all that apply:

History of heart failure with reduced ejection fraction

History of high blood pressure or currently on antihypertensive treatment

Type 1 or type 2 diabetes

Previous stroke, transient ischemic attack, or thromboembolism

Previous myocardial infarction, peripheral artery disease, or aortic plaque

About CHA₂DS₂-VASc Score

The CHA₂DS₂-VASc score is a clinical prediction tool used to estimate the risk of stroke in patients with non-valvular atrial fibrillation. It helps clinicians decide whether anticoagulation therapy is appropriate.

Scoring System

  • Congestive heart failure: 1 point
  • Hypertension: 1 point
  • Age ≥75 years: 2 points
  • Diabetes: 1 point
  • Stroke/TIA/thromboembolism: 2 points
  • Vascular disease: 1 point
  • Age 65-74 years: 1 point
  • Sc (Sex category: female): 1 point

Risk Categories & Treatment Guidance

  • Score 0 (Men) or 1 (Women): Low risk - No anticoagulation therapy recommended
  • Score 1 (Men): Moderate risk - Consider anticoagulation based on bleeding risk
  • Score ≥2 (Men) or ≥3 (Women): High risk - Oral anticoagulation recommended

Limitations

  • Designed specifically for patients with atrial fibrillation
  • Does not account for bleeding risk (use HAS-BLED for bleeding risk assessment)
  • Clinical judgment should always supersede calculator results

Frequently Asked Questions

1. What is the CHA₂DS₂-VASc score used for?

The CHA₂DS₂-VASc score is used to assess stroke risk in patients with atrial fibrillation, helping clinicians decide on anticoagulation therapy.

2. What does a high CHA₂DS₂-VASc score mean?

A higher score indicates greater stroke risk. Scores of 2 or more in men or 3 or more in women typically warrant anticoagulation therapy.

3. How often should the CHA₂DS₂-VASc score be reassessed?

The score should be reassessed periodically, especially when new medical conditions develop or at least annually for patients with atrial fibrillation.

4. What's the difference between CHADS₂ and CHA₂DS₂-VASc?

CHA₂DS₂-VASc is an updated version that includes additional risk factors (vascular disease, age 65-74, female sex) and provides better risk stratification for low-risk patients.