Stroke Volume Calculator
Stroke volume (SV) is the amount of blood the left ventricle ejects in one contraction. It's a crucial indicator of cardiac performance. While direct measurement requires invasive methods, we can estimate it using indirect values like heart rate and cardiac output, or by understanding its relationship with ejection fraction.
Cardiac Output (L/min):
Heart Rate (beats/min):
Calculate Stroke Volume
.stroke-volume-calculator {
font-family: Arial, sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 400px;
margin: 20px auto;
background-color: #f9f9f9;
}
.stroke-volume-calculator h2 {
text-align: center;
color: #333;
margin-bottom: 20px;
}
.stroke-volume-calculator p {
font-size: 0.9em;
line-height: 1.5;
color: #555;
margin-bottom: 25px;
}
.input-section {
margin-bottom: 15px;
display: flex;
flex-direction: column;
}
.input-section label {
margin-bottom: 5px;
font-weight: bold;
color: #444;
}
.input-section input {
padding: 10px;
border: 1px solid #ddd;
border-radius: 4px;
font-size: 1em;
box-sizing: border-box; /* Ensures padding doesn't affect width */
}
.stroke-volume-calculator button {
width: 100%;
padding: 12px 20px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
font-size: 1.1em;
cursor: pointer;
transition: background-color 0.3s ease;
}
.stroke-volume-calculator button:hover {
background-color: #0056b3;
}
.result-section {
margin-top: 25px;
padding: 15px;
background-color: #e9ecef;
border: 1px solid #ced4da;
border-radius: 4px;
text-align: center;
font-size: 1.1em;
color: #333;
font-weight: bold;
}
.result-section span {
color: #28a745;
}
function calculateStrokeVolume() {
var cardiacOutput = parseFloat(document.getElementById("cardiacOutput").value);
var heartRate = parseFloat(document.getElementById("heartRate").value);
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = ""; // Clear previous results
if (isNaN(cardiacOutput) || isNaN(heartRate)) {
resultDiv.innerHTML = "Please enter valid numbers for both fields.";
return;
}
if (heartRate <= 0) {
resultDiv.innerHTML = "Heart rate must be a positive number.";
return;
}
if (cardiacOutput < 0) {
resultDiv.innerHTML = "Cardiac output cannot be negative.";
return;
}
// Formula: Stroke Volume (SV) = Cardiac Output (CO) / Heart Rate (HR)
var strokeVolume = cardiacOutput / heartRate;
resultDiv.innerHTML = "Estimated Stroke Volume:
" + strokeVolume.toFixed(2) + " L/beat";
}