Doppler Echo Cardiac Output Calculator

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Left ventricular outflow tract diameter measured in the parasternal long-axis view at mid-systole, in centimetres. Typical adult range is 1.8-2.2 cm.
cm
Velocity time integral of the LVOT pulsed-wave Doppler envelope, in centimetres. Represents the stroke distance - the distance blood travels per beat. Normal adult value is approximately 18-25 cm.
cm
Heart rate in beats per minute. Use the rate measured at the time of the Doppler acquisition.
bpm
Patient height, used to calculate body surface area (BSA) for the cardiac index.
cm
Patient weight, used to calculate body surface area (BSA) for the cardiac index.
kg
Cardiac OutputNormal cardiac output
4.4L/min

Volume of blood the heart pumps per minute

Cardiac Index2.42L/min/m²
Stroke Volume62.8mL
LVOT CSA3.14cm²
Body Surface Area1.82m²
4.4 L/min
Low<4Normal4-8High8+

Cardiac output is 4.40 L/min, within the normal range.

  • Stroke volume of 63 mL is within the normal adult range of 50-100 mL.
  • The cardiac index is below the normal threshold of 2.5 L/min/m², which may indicate haemodynamic compromise.
  • Accuracy depends on obtaining a well-defined Doppler envelope aligned with the LVOT axis and a precise diameter measurement - small errors in diameter are squared in the CSA calculation.

Next stepCorrelate with clinical findings and other haemodynamic parameters. Serial measurements are more informative than a single value.

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