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Umbilical Arterial Doppler Indices in Acute Uteroplacental Flow Occlusion
Author(s) -
MAULIK DEV,
DOWNING GREGORY J.,
YARLAGADDA PRASAD
Publication year - 1990
Publication title -
echocardiography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 62
eISSN - 1540-8175
pISSN - 0742-2822
DOI - 10.1111/j.1540-8175.1990.tb00412.x
Subject(s) - cardiology , diastole , cardiac cycle , medicine , circulatory system , doppler effect , umbilical artery , blood flow , hemodynamics , doppler echocardiography , occlusion , cardiac output , anesthesia , blood pressure , pregnancy , fetus , biology , physics , astronomy , genetics
This study was undertaken to investigate in an acute model the effects of acute transient occlusion of the uterine blood flow on the umbilical arterial Doppler indices. Transient uteroplacental circulatory insufficiency was produced in five pregnant ewes (gestational age 115–120 days) by reversible mechanical occlusion of the common hypogastric artery for 20 seconds. The Doppler indices measured were the systolic‐diastolic ratio, the pulsatility index and the resistance index. The duration of the cardiac cycle and its systolic and diastolic times were approximated from the Doppler waveform. The occlusion produced transient increases in the Doppler indices and cardiac cycle time. The uteroplacental circulatory insufficiency induced increases (P < 0.005) in the Doppler indices disappeared (P > 0.05) when the latter were corrected for the changes in the cardiac cycle time. Furthermore, diastolic time was the main component of the changes in the cardiac cycle time, and the Doppler indices demonstrated a higher correlation with diastolic time than with systolic time. The results verified that changes in the duration of the fetal cardiac cycle play an important role in shaping the umbilical arterial Doppler waveform and hence need to be taken into account in estimating the Doppler indices.