.chadsvasc-calculator-container {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
max-width: 700px;
margin: 20px auto;
padding: 25px;
border: 1px solid #e0e0e0;
border-radius: 10px;
background-color: #f9f9f9;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
color: #333;
}
.chadsvasc-calculator-container h2 {
text-align: center;
color: #2c3e50;
margin-bottom: 25px;
font-size: 1.8em;
border-bottom: 2px solid #3498db;
padding-bottom: 10px;
}
.chadsvasc-calculator-container .input-group {
margin-bottom: 18px;
display: flex;
align-items: center;
padding: 8px 0;
border-bottom: 1px dashed #eee;
}
.chadsvasc-calculator-container .input-group:last-of-type {
border-bottom: none;
}
.chadsvasc-calculator-container label {
flex: 2;
font-weight: 600;
color: #555;
font-size: 1.05em;
cursor: pointer;
}
.chadsvasc-calculator-container input[type="checkbox"],
.chadsvasc-calculator-container input[type="radio"] {
margin-right: 10px;
transform: scale(1.2);
accent-color: #3498db;
}
.chadsvasc-calculator-container input[type="number"] {
flex: 1;
padding: 10px;
border: 1px solid #ccc;
border-radius: 5px;
font-size: 1em;
width: 80px; /* Fixed width for age input */
text-align: center;
}
.chadsvasc-calculator-container .radio-group {
display: flex;
gap: 20px;
flex: 1;
justify-content: flex-end;
}
.chadsvasc-calculator-container .radio-group label {
font-weight: normal;
flex: none;
}
.chadsvasc-calculator-container button {
display: block;
width: 100%;
padding: 12px 20px;
margin-top: 30px;
background-color: #3498db;
color: white;
border: none;
border-radius: 5px;
font-size: 1.1em;
font-weight: bold;
cursor: pointer;
transition: background-color 0.3s ease, transform 0.2s ease;
}
.chadsvasc-calculator-container button:hover {
background-color: #2980b9;
transform: translateY(-2px);
}
.chadsvasc-calculator-container #chadsvascResult {
margin-top: 30px;
padding: 20px;
border: 1px solid #dcdcdc;
border-radius: 8px;
background-color: #eaf7ff;
text-align: center;
font-size: 1.2em;
color: #2c3e50;
min-height: 60px;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
line-height: 1.6;
}
.chadsvasc-calculator-container #chadsvascResult strong {
color: #e74c3c;
font-size: 1.4em;
display: block;
margin-bottom: 10px;
}
.chadsvasc-calculator-container .points-info {
font-size: 0.9em;
color: #666;
margin-top: 5px;
}
CHADS-VASc Score Calculator
Your CHADS-VASc Score will appear here.
function calculateCHADS_VASc() {
var score = 0;
// Get input values
var chf = document.getElementById("chf").checked;
var hypertension = document.getElementById("hypertension").checked;
var ageInput = document.getElementById("age").value;
var diabetes = document.getElementById("diabetes").checked;
var strokeTIA = document.getElementById("strokeTIA").checked;
var vascularDisease = document.getElementById("vascularDisease").checked;
var sexFemale = document.getElementById("sexFemale").checked;
var age = parseInt(ageInput);
// Validate age input
if (isNaN(age) || age 120) {
document.getElementById("chadsvascResult").innerHTML = "Error: Please enter a valid age between 0 and 120.";
return;
}
// Apply points
if (chf) {
score += 1; // C: Congestive Heart Failure
}
if (hypertension) {
score += 1; // H: Hypertension
}
if (age >= 75) {
score += 2; // A: Age >= 75 years
} else if (age >= 65 && age <= 74) {
score += 1; // A: Age 65-74 years
}
if (diabetes) {
score += 1; // D: Diabetes Mellitus
}
if (strokeTIA) {
score += 2; // S2: Prior Stroke, TIA, or Thromboembolism
}
if (vascularDisease) {
score += 1; // V: Vascular disease
}
if (sexFemale) {
score += 1; // Sc: Sex category (Female)
}
var resultText = "Your CHADS-VASc Score is: " + score + " points.";
var interpretation = "";
if (score === 0) {
interpretation = "Low risk of stroke. Antithrombotic therapy may not be needed, or aspirin could be considered (though oral anticoagulation is generally preferred if any risk factors are present).";
} else if (score === 1) {
interpretation = "Low-moderate risk of stroke. Oral anticoagulation (OAC) should be considered, especially if the single risk factor is not sex (e.g., hypertension, diabetes). Aspirin alone is generally not recommended.";
} else if (score >= 2) {
interpretation = "Moderate-high risk of stroke. Oral anticoagulation (OAC) is strongly recommended.";
}
document.getElementById("chadsvascResult").innerHTML = resultText + interpretation;
}
Understanding the CHADS-VASc Score
The CHADS-VASc score is a widely used clinical risk stratification tool that helps estimate the risk of stroke in patients with non-valvular atrial fibrillation (AFib). Atrial fibrillation is an irregular and often rapid heart rate that can lead to blood clots forming in the heart, which can then travel to the brain and cause a stroke. The CHADS-VASc score guides healthcare providers in deciding whether a patient with AFib should receive anticoagulant therapy (blood thinners) to prevent strokes.
Components of the CHADS-VASc Score
Each letter in CHADS-VASc represents a specific risk factor, and points are assigned based on the presence of these factors:
- C – Congestive Heart Failure (or Left Ventricular Systolic Dysfunction): 1 point
- H – Hypertension (High Blood Pressure): 1 point (treated or untreated)
- A – Age ≥ 75 years: 2 points
- D – Diabetes Mellitus: 1 point
- S2 – Prior Stroke, Transient Ischemic Attack (TIA), or Thromboembolism: 2 points
- V – Vascular disease: 1 point (includes prior myocardial infarction, peripheral artery disease, or aortic plaque)
- A – Age 65-74 years: 1 point
- Sc – Sex category (Female): 1 point
How the Score is Calculated
To calculate the CHADS-VASc score, you simply add up the points for each risk factor present in a patient. For example:
- A 70-year-old male with hypertension and diabetes would have a score of: 1 (Hypertension) + 1 (Age 65-74) + 1 (Diabetes) = 3 points.
- A 78-year-old female with a history of stroke and congestive heart failure would have a score of: 1 (CHF) + 2 (Age ≥ 75) + 2 (Stroke) + 1 (Female Sex) = 6 points.
Interpreting Your CHADS-VASc Score
The total score helps determine the recommended course of action regarding antithrombotic therapy:
- Score 0 (Males) / 1 (Females): Generally considered low risk. Oral anticoagulation may not be needed, or aspirin could be considered, though OAC is often preferred if any risk factors are present.
- Score 1 (Males) / 2 (Females): Low-moderate risk. Oral anticoagulation (OAC) should be considered, especially if the single risk factor is not sex. Aspirin alone is generally not recommended.
- Score ≥ 2 (Males) / ≥ 3 (Females): Moderate-high risk. Oral anticoagulation (OAC) is strongly recommended to reduce the risk of stroke.
It's important to note that while the CHADS-VASc score is a powerful tool, it is just one component of a comprehensive clinical assessment. Treatment decisions should always be made in consultation with a qualified healthcare professional, who can consider all aspects of a patient's health, including bleeding risk and individual preferences.