Description
Return total and loss-adjusted forward stroke-volume terms.
Cardiac measurement formulas depend on geometry, units, calibration and reference origins. A Doppler projection correction, echo disc-volume contribution or waveform integral evaluates supplied quantities without validating image acquisition, signal quality or physiological interpretation.
Return total and loss-adjusted forward stroke-volume terms.
When to use this tool
Use Cardiac Research Stroke Volume Balance when checking one supplied cardiac measurement, geometry or calibration term.
How to use the tool and how it works
- Enter endDiastolicVolume, endSystolicVolume, regurgitantVolume, shuntLoss. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read totalStrokeVolume, forwardVolume, forwardFraction. Use the output convention below.
Return total and loss-adjusted forward stroke-volume terms. Require EDV > ESV >= 0 and nonnegative regurgitantVolume/shuntLoss; totalStrokeVolume = EDV-ESV, forwardVolume subtracts both losses, forwardFraction = forward/total.1
Disc summation combines geometric volume contributions. Ventricular ejection fraction uses chamber end-diastolic and end-systolic volumes; a supplied forward-flow fraction is a different quantity.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| endDiastolicVolume | End Diastolic Volume | Required. Finite number. |
| endSystolicVolume | End Systolic Volume | Required. Finite number; minimum 0. |
| regurgitantVolume | Regurgitant Volume | Required. Finite number; minimum 0. |
| shuntLoss | Shunt Loss | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| totalStrokeVolume | Total Stroke Volume | Required. Finite number. |
| forwardVolume | Forward Volume | Required. Finite number. |
| forwardFraction | Forward volume divided by supplied total stroke volume; not ventricular ejection fraction. | Required. Finite number. |
{
"input": {
"endDiastolicVolume": 120,
"endSystolicVolume": 50,
"regurgitantVolume": 10,
"shuntLoss": 5
},
"output": {
"totalStrokeVolume": 70,
"forwardVolume": 55,
"forwardFraction": 0.7857142857142857
}
}Limitations and assumptions
- Forward values can be negative under inconsistent supplied losses; this is not ejection fraction, an echo measurement or a treatment decision.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use validated acquisition and calibration, a complete appropriate measurement method and qualified clinical interpretation; assess measurement uncertainty and model assumptions separately.
References
-
Calculation and input contract: cardiology/cardiac-research-stroke-volume-balance — tool.io
-
Cardiac chamber quantification by echocardiography in adults — Roberto M. Lang and coauthors; ASE/EACVI
Similar or alternative tools
- Cardiac Research Fractional Area Change
Return fractional area change and supplied-uncertainty bounds.
- Echo Reference Axis Gap
Compare two echo-axis endpoints against a shared origin.