Doppler velocimetry
Pronunciation: DOP-ler ve-LOS-ih-meh-tree
Ultrasound technique measuring blood flow velocity in fetal and maternal vessels to assess placental function and fetal well-being.
Full Definition
Doppler velocimetry is an ultrasound technique that measures blood flow velocity and direction in fetal, placental, and maternal vessels to assess cardiovascular function and placental adequacy. Common applications include evaluation of umbilical artery, middle cerebral artery, and uterine artery waveforms. Key parameters include pulsatility index (PI), resistance index (RI), and systolic/diastolic ratios. Abnormal Doppler findings may indicate placental insufficiency, fetal hypoxia, or increased risk of adverse outcomes. Umbilical artery Doppler is particularly useful in monitoring growth-restricted fetuses, while middle cerebral artery Doppler helps assess fetal anemia and cerebral redistribution. The technique provides valuable hemodynamic information for timing delivery decisions in high-risk pregnancies.
Usage
Usage note: Capitalize Doppler (named after Christian Doppler); specify vessel when reporting.
In Context
- "Doppler velocimetry showed absent end-diastolic flow in the umbilical artery." — Antepartum surveillance report
- "Middle cerebral artery Doppler velocimetry was performed to rule out fetal anemia." — Specialized ultrasound examination