This calculator helps determine the heart rate from an electrocardiogram (EKG) strip. Accurate heart rate calculation is crucial for diagnosing various cardiac conditions.
function calculateEKGHeartRate() {
var rWaveInterval = parseFloat(document.getElementById("rWaveInterval").value);
var stripSpeed = parseFloat(document.getElementById("stripSpeed").value);
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = "; // Clear previous results
if (isNaN(rWaveInterval) || isNaN(stripSpeed) || rWaveInterval <= 0 || stripSpeed <= 0) {
resultDiv.innerHTML = "Please enter valid positive numbers for both R-R Interval and Paper Speed.";
return;
}
// Method 1: Using R-R Interval (most accurate if interval is precise)
// Heart Rate = 60 / R-R Interval (in seconds)
var heartRateRR = 60 / rWaveInterval;
// Method 2: Using large boxes (if R-R interval is not precisely known or for a quick estimate)
// Assuming standard EKG paper where each large box is 0.2 seconds (5 small boxes)
// This method is less precise if the R-R interval isn't exactly a whole number of large boxes.
// We'll use the R-R interval directly as it's provided.
// Method 3: Counting complexes in a 6-second strip (common in clinical settings)
// This calculator focuses on the R-R interval method for precision based on input.
// For 6-second strip method, you would need the duration of the strip and count QRS complexes.
// Displaying the most precise calculation based on the provided R-R interval
resultDiv.innerHTML = "Calculated Heart Rate: " + heartRateRR.toFixed(0) + " bpm";
resultDiv.innerHTML += "Calculation based on R-R interval of " + rWaveInterval + " seconds.";
}
.calculator-container {
font-family: Arial, sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 400px;
margin: 20px auto;
background-color: #f9f9f9;
}
.calculator-container h2 {
text-align: center;
margin-bottom: 15px;
color: #333;
}
.input-section {
margin-bottom: 15px;
}
.input-section label {
display: block;
margin-bottom: 5px;
font-weight: bold;
color: #555;
}
.input-section input {
width: calc(100% – 12px);
padding: 8px;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
}
button {
display: block;
width: 100%;
padding: 10px;
background-color: #4CAF50;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
margin-top: 10px;
}
button:hover {
background-color: #45a049;
}
#result {
margin-top: 20px;
padding: 10px;
border: 1px solid #ddd;
background-color: #fff;
border-radius: 4px;
text-align: center;
}
#result p {
margin: 5px 0;
}
#result strong {
color: #007bff;
}