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[Study on utero-placental circulation by pulsed-Doppler technique--blood flowmetric study in placental pores]
The flow velocity waveform (FVW) was obtained by means of the pulsed-Doppler technique from the placental pores visualized as anechoic areas on the ultrasonic tomogram in 36 cases of singletons and 7 cases of multiple pregnancies. Utilised parameters for analysis of the sonogram were resistance index and systolic to diastolic ratio of flow velocity (S/D ratio) which were independent of the angle between the ultrasonic beam and the direction of blood flow. Diagnostic apparatus were composed of real-time sector scanner and Doppler unit with FFT analyser by which sampling points were selectable within 15 cm of depth. The FVW from the placental pores was recorded as the toward flow in the case of posteriorly attached placentas and was similar to the one from the arcuate arteries which has poor pulsatility and high diastolic flow in the normal pregnancies. There was a tendency for the increase in the gestosis index (GI) to be related to that of RI. Multiple pregnancies revealed lower RI than singletons in the same GI group. There was reverse correlation between mean birth weight and mean RI in the cases who received pulsed-Doppler examination within 2 weeks prior to delivery. The RI and S/D ratio showed a high correlation in the each cases (r = 0.99).
The flow velocity waveform (FVW) was obtained by means of the pulsed-Doppler technique from the placental pores visualized as anechoic areas on the ultrasonic tomogram in 36 cases of singletons and 7 cases of multiple pregnancies. Utilised parameters for analysis of the sonogram were resistance index and systolic to diastolic ratio of flow velocity (S/D ratio) which were independent of the angle between the ultrasonic beam and the direction of blood flow. Diagnostic apparatus were composed of real-time sector scanner and Doppler unit with FFT analyser by which sampling points were selectable within 15 cm of depth. The FVW from the placental pores was recorded as the toward flow in the case of posteriorly attached placentas and was similar to the one from the arcuate arteries which has poor pulsatility and high diastolic flow in the normal pregnancies. There was a tendency for the increase in the gestosis index (GI) to be related to that of RI. Multiple pregnancies revealed lower RI than singletons in the same GI group. There was reverse correlation between mean birth weight and mean RI in the cases who received pulsed-Doppler examination within 2 weeks prior to delivery. The RI and S/D ratio showed a high correlation in the each cases (r = 0.99).