DOPPLER FLOW VELOCITY WAVE-FORMS IN THE FETAL DUCTUS-ARTERIOSUS DURING THE 1ST-HALF OF PREGNANCY - A REPRODUCIBILITY STUDY

Reproducibility of flow velocity waveform measurement in the fetal duc tus arteriosus was studied in 52 normal pregnancies between 11 and 25 weeks of gestation. The flow velocity parameters studied were the peak systolic velocity, mean velocity, end-diastolic velocity, flow veloci ty integral and acceleration time. In each woman two consecutive measu rements were performed with a time delay of 15 min. An acceptable repr oducibility was achieved for all flow velocity parameters, except for the acceleration time and end-diastolic velocity.