Fractional Shortening Guide
Fractional shortening is a simple cardiac measurement. It estimates how much the left ventricle narrows during contraction. The calculator uses two chamber diameters. The first value is the end diastolic diameter. The second value is the end systolic diameter. Both values must use the same anatomical line.
Why This Number Matters
Fractional shortening helps describe ventricular pump movement. It is often reviewed with ejection fraction, wall motion, symptoms, and image quality. A higher percentage means the chamber became much smaller during systole. A lower percentage means the chamber changed less. This may suggest reduced systolic function, loading effects, or a measurement issue.
How The Tool Helps
This calculator accepts millimeters, centimeters, or inches. It converts values to a common internal unit. It then finds absolute shortening, fractional shortening, systolic ratio, and an estimated Teichholz ejection fraction. The estimate is optional guidance only. It should not replace a full echocardiography report.
Good Data Gives Better Results
Enter values from the same study, view, and beat type. Avoid mixing measurements from different views. Check that the systolic diameter is smaller than the diastolic diameter. If it is not, the result may be invalid. Use the notes field to record rhythm, imaging mode, and measurement source.
Practical Interpretation
Many adult references treat roughly 25% to 45% as a common range. Laboratories may use different limits. Children, athletes, valve disease, and abnormal loading can change meaning. Fractional shortening is also geometry dependent. It can look misleading when regional wall motion is abnormal. Always compare the number with clinical context.
Reporting And Exporting
The page creates a result panel above the form. It also draws a simple chart for visual review. CSV export helps spreadsheet storage. PDF export helps quick reporting. The example table shows common test cases. Use the decimal setting to match your reporting style. Keep saved reports with date, label, and measurement notes. Review repeated studies with the same measurement method whenever possible. Small diameter errors can change the percentage quickly. For borderline values, repeat tracing and check calibration. Do not base treatment decisions on this tool alone. Use it as a transparent arithmetic aid. Confirm final findings with a qualified clinician.