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About: Velocity time integral     Goto   Sponge   NotDistinct   Permalink

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Velocity Time Integral is a clinical Doppler ultrasound measurement of blood flow, equivalent to the area under the velocity time curve. The product of VTI (cm/stroke) and the cross sectional area of a valve (cm2) yields a stroke volume (cm3/stroke), which can be used to calculate cardiac output. VTI can be performed across the left ventricular outflow tract (LVOT), carotid artery, or other blood vessels.