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Stroke Volume, Cardiac Output, and Systemic Vascular Resistance

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Abstract

The stroke volume (SV), cardiac output (CO), and systemic vascular resistance (SVR) are all derived from two ultrasound measurements: the left ventricular outflow tract diameter (LVOTD) and the left ventricular outflow tract velocity time integral (LVOT VTI). The SV is the root measurement, which is simply multiplied by the heart rate (HR) to obtain the cardiac output. The systemic vascular resistance (SVR) can be calculated using patient’s mean arterial blood pressure (MAP) and CO. Most ultrasound systems have software to automatically calculate the SV once the LVOTD and LVOT VTI are entered. However, few will have the CO and SVR calculations. These values can be calculated either using the formulas below or with the help of online or phone applications.

Keywords

  • Stroke volume
  • Cardiac output
  • Systemic vascular resistance
  • Velocity time integral (VTI)
  • Left ventricular outflow tract diameter (LVOTD)

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  • DOI: 10.1007/978-3-030-74687-2_10
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Correspondence to Sarah B. Murthi .

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Murthi, S.B., Fatima, S. (2021). Stroke Volume, Cardiac Output, and Systemic Vascular Resistance. In: Salerno, A., Haase, D.J., Murthi, S.B. (eds) Atlas of Critical Care Echocardiography. Springer, Cham. https://doi.org/10.1007/978-3-030-74687-2_10

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  • DOI: https://doi.org/10.1007/978-3-030-74687-2_10

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-74685-8

  • Online ISBN: 978-3-030-74687-2

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