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Greggory R. DeVore MD

. Part I: The Use of the Umbilical Artery Doppler in High- and Low-Risk Patients. First use of Doppler ultrasonography to study flow velocity in the fetal umbilical artery was reported in 1977Fitzgerald and Drumm. Non-invasive measurement of human circulation using ultrasound: a new method. BMJ

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Greggory R. DeVore MD

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    9. Observational Studies: Association between reduced end-diastolic umbilical artery velocities and increased vascular resistance in the fetoplacental circulation

    17. Trudinger et al 1987 McPharland et al 1988 Hofmeyr et al 1991 Newham et al 1991 Burke et al 1992 Almstrom et al 1992

    44. Blood supply provided by the ovarian and uterine arteries Uterine Arteries: main branches of the internal iliac arteries Uterine Arteries: Ascend through the lateral wall and anastomose with the ovarian arteries

    48. Component 1: Pulsatile Waveform Component II: Steady Waveform

    49. Pulsatile Component: Formed by the interaction of an outgoing and reflected wave, which bounces back to the heart upon reaching the uteroplacental vascular bed

    50. Increased Resistance Decrease Mean Velocity Elevated PI Development of a notch in the early diastolic portion of the velocity waveforem caused by destructive interaction between outgoing and reflected waves

    51. Decrease Uterine Artery Radius Increase Mean Velocity Elevated PI and S/D NO DIASTOLIC NOTCH

    52. Increase Mean Arterial Pressure Elevation in mean velocity NO change in RI or S/D NO DIASTOLIC NOTCH

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