PMID: 1213965Dec 11, 1975Paper

Measurement of umbilical blood flow in fetal lambs in utero

Journal of Applied Physiology
W BermanA M Rudolph

Abstract

We continuously measured umbilical blood flow in fetal lambs in utero by placing an electromagnetic flow transducer around the common umbilical artery. Umbilical arteries originate from a short common segment as the terminal branches of the descending aorta. This segment was isolated by a retroperitoneal surgical approach and encircled with a specially constructed electromagnetic flow transducer. Catheters were also placed in fetal vessles to monitor pressure and derive flow values by the radionuclide-labeled microsphere technique. The fetus and ewe were allowed to recover for two days before studies were performed. Average umbilical blood flow obtained in 11 animals with the transducer was 199 ml/kg per min. In seven animals flow measurements obtained with the transducer were compared with those derived from microsphere injections. Paired measurements varied by an average of only 5.3%. This technique makes possible the accurate and instantaneous measurement of umbilical blood flow in fetal lambs in utero over a prolonged period.

Citations

Mar 1, 1979·Circulation Research·H S IwamotoM A Heymann
Jun 5, 1998·The American Journal of Physiology·A ChlorakosS L Adamson
Mar 24, 1999·Pediatric Research·V A GournayA M Rudolph
Jan 1, 1984·Journal of Perinatal Medicine·H C Wallenburg, J P Kuijken
Jan 31, 2006·Drug Metabolism and Disposition : the Biological Fate of Chemicals·Marianne GarlandRaymond I Stark
Jan 20, 2018·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·An Qi DuanMike Seed
Oct 18, 2008·Prenatal Diagnosis·Susana FernandezEduard Gratacos
Jan 1, 1988·Ultrasound in Medicine & Biology·A KurjakM Miljan
Sep 3, 2002·Pediatrics·Julien I E Hoffman

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