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    • Home
    • About
    • Knobology
      • What is Ultrasound
      • Cardinal Movements
      • Ultrasound Modes
    • Cardiac
      • Basic Cardiac Views
      • LV Function
      • RV Function
      • Aortic Regurgitation
      • Aortic Stenosis
      • Mitral Regurgitation
      • Tricuspid Regurgitation
    • Lung
      • Lung Assessment
      • Pneumothorax
      • Pleural Effusion
    • Volume
      • JVP
      • IVC
    • Abdomen/Renal
      • FAST Exam
      • Hydronephrosis
    • Advanced
      • THI/Dynamic Range
      • Velocity Time Integral
      • LVOT VTI
      • VEXUS
    • GIM Fellows
    • POCUS Selective
    • Contact
  • Home
  • About
  • Knobology
    • What is Ultrasound
    • Cardinal Movements
    • Ultrasound Modes
  • Cardiac
    • Basic Cardiac Views
    • LV Function
    • RV Function
    • Aortic Regurgitation
    • Aortic Stenosis
    • Mitral Regurgitation
    • Tricuspid Regurgitation
  • Lung
    • Lung Assessment
    • Pneumothorax
    • Pleural Effusion
  • Volume
    • JVP
    • IVC
  • Abdomen/Renal
    • FAST Exam
    • Hydronephrosis
  • Advanced
    • THI/Dynamic Range
    • Velocity Time Integral
    • LVOT VTI
    • VEXUS
  • GIM Fellows
  • POCUS Selective
  • Contact

Velocity Time Integral (VTI)

  • Velocity Time Integral (VTI) is the area under the curve on a Pulse Wave Doppler tracing.  It represents the distance blood travels during one heartbeat. In the LVOT (Left Ventricular Outflow Tract), the Doppler tracing shows velocity on the Y-axis and time on the X-axis. By calculating the area under this curve (VTI), and multiplying it by the cross-sectional area of the LVOT, you can estimate stroke volume. 


  • Stroke Volume = LVOT area × VTI
  • LVOT area = π × (LVOT radius)²

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Resource: cpocus.ca, EDE Handbook

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