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Uterine Blood Flow During Labor

Intrauterine pressure and scintillation counts were recorded continuously and simultaneously over placental and nonplacental sites in 15 patients requiring placental localization by RISA during labor. Raw data were processed by point average method and by Fourier analysis. The functional meaning of the results of analysis was tested against a physiologic model of uterine blood flow and uterine blood volume changes during contractions. Although the curves from scintillation counts agreed with those obtained from the model in uterine regional blood volume displacement (RBVD), they were different insofar as uterine blood flow (UBF) was concerned. Thus, processing raw data of scintillation counts, either by point average method or by Fourier analysis, is not sufficient to measure uterine blood flow. The pattern of uterine regional blood volume displacement in relation to 80 contractions with normal tonus and four contractions with uterine tonus greater than 20 mmHg was evaluated in healthy and preeclamptic patients during spontaneous or oxytocin-supported labor.