CHA2DS2-VASc Score Calculator
Use this calculator to estimate the risk of stroke in patients with non-valvular atrial fibrillation based on the CHA2DS2-VASc scoring system.
Understanding the CHA2DS2-VASc Score
The CHA2DS2-VASc score is a widely used clinical prediction rule for estimating the risk of stroke in patients with non-valvular atrial fibrillation (AF). Atrial fibrillation is an irregular and often rapid heart rate that can increase the risk of stroke, heart failure, and other heart-related complications. The score helps clinicians decide whether a patient with AF should receive anticoagulation therapy (blood thinners) to prevent stroke.
Components of the CHA2DS2-VASc Score:
- C – Congestive Heart Failure (1 point): A history of heart failure, particularly with reduced ejection fraction.
- H – Hypertension (1 point): A history of high blood pressure, either currently treated or previously diagnosed.
- A2 – Age ≥ 75 years (2 points): Patients aged 75 years or older have a significantly higher risk.
- D – Diabetes Mellitus (1 point): A history of diabetes.
- S2 – Prior Stroke, TIA, or Thromboembolism (2 points): A previous stroke, transient ischemic attack (TIA), or other thromboembolic event is a strong predictor of future events.
- V – Vascular Disease (1 point): Includes conditions like prior myocardial infarction (MI), peripheral artery disease (PAD), or aortic plaque.
- A – Age 65-74 years (1 point): Patients in this age range have an increased risk compared to younger individuals.
- Sc – Sex Category (Female) (1 point): Female sex is considered an independent risk factor.
Interpreting the CHA2DS2-VASc Score:
The total score ranges from 0 to 9. The higher the score, the greater the estimated annual risk of stroke. Guidelines typically recommend:
- Score of 0 (Males) or 1 (Females): Low risk. Anticoagulation may not be necessary, or aspirin might be considered in some cases, though often no antithrombotic therapy is recommended.
- Score of 1 (Males) or 2 (Females): Moderate risk. Oral anticoagulation (OAC) is generally recommended.
- Score of 2 or higher (Males) or 3 or higher (Females): High risk. Oral anticoagulation (OAC) is strongly recommended.
It's important to note that this calculator provides a risk assessment tool and is not a substitute for professional medical advice. Treatment decisions should always be made by a qualified healthcare provider, considering individual patient factors, bleeding risk, and preferences.
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function calculateCha2ds2Vasc() {
var score = 0;
// Age
var ageInput = document.getElementById("age").value;
var age = parseInt(ageInput);
if (isNaN(age) || age = 75) {
score += 2; // A2
} else if (age >= 65 && age <= 74) {
score += 1; // A
}
// Sex Category (Sc)
var sexFemale = document.getElementById("sexFemale").checked;
if (sexFemale) {
score += 1;
}
// Congestive Heart Failure (C)
if (document.getElementById("congestiveHeartFailure").checked) {
score += 1;
}
// Hypertension (H)
if (document.getElementById("hypertension").checked) {
score += 1;
}
// Diabetes Mellitus (D)
if (document.getElementById("diabetesMellitus").checked) {
score += 1;
}
// Prior Stroke, TIA, or Thromboembolism (S2)
if (document.getElementById("strokeTia").checked) {
score += 2;
}
// Vascular Disease (V)
if (document.getElementById("vascularDisease").checked) {
score += 1;
}
var riskInterpretation = "";
if (sexFemale) { // Female patient
if (score === 0) {
riskInterpretation = "Low risk. No antithrombotic therapy or aspirin may be considered.";
} else if (score === 1) {
riskInterpretation = "Low risk. No antithrombotic therapy or aspirin may be considered.";
} else if (score === 2) {
riskInterpretation = "Moderate risk. Oral anticoagulation is generally recommended.";
} else {
riskInterpretation = "High risk. Oral anticoagulation is strongly recommended.";
}
} else { // Male patient
if (score === 0) {
riskInterpretation = "Low risk. No antithrombotic therapy or aspirin may be considered.";
} else if (score === 1) {
riskInterpretation = "Moderate risk. Oral anticoagulation is generally recommended.";
} else {
riskInterpretation = "High risk. Oral anticoagulation is strongly recommended.";
}
}
document.getElementById("result").innerHTML =
"Your calculated CHA
2DS
2-VASc Score is:
" + score + "" +
"Risk Interpretation:
" + riskInterpretation + "";
}
// Initial calculation on page load for default values
window.onload = function() {
calculateCha2ds2Vasc();
};