OBJECTIVE: Our purpose was to establish whether, in normal human pregnancies, the maternal intravenous infusion of amino acids can increase fetal amino acid uptake and amino acid concentrations. STUDY DESIGN:Twenty-six normal pregnancies were studied at the time of cesarean delivery (38-40 weeks' gestation). In 10 cases an amino acid formulation (Freamine 8.5% III, Baxter) was infused into a maternal vein before cesarean delivery. Maternal blood samples were obtained during the course of the study. Umbilical venous and arterial samples were obtained from the clamped segment of the cord. There were no differences between the 2 groups for fetal and placental weights and for fetal oxygenation and acid-base balance. RESULTS:Maternal amino acid concentrations increased significantly in the group receiving infusions. Significant increases in umbilical venous concentrations were observed for most amino acids, except for histidine and threonine. The amino acid umbilical arteriovenous differences per mole of oxygen (AA/O(2) ratio) increased significantly for leucine, isoleucine, valine, methionine, phenylalanine, arginine, glycine, serine, alanine, and proline. There were no significant increases for lysine, histidine, and threonine. CONCLUSION: An increase in maternal concentrations leads to an increase in the delivery of most amino acids to the fetus.
RCT Entities:
OBJECTIVE: Our purpose was to establish whether, in normal human pregnancies, the maternal intravenous infusion of amino acids can increase fetal amino acid uptake and amino acid concentrations. STUDY DESIGN: Twenty-six normal pregnancies were studied at the time of cesarean delivery (38-40 weeks' gestation). In 10 cases an amino acid formulation (Freamine 8.5% III, Baxter) was infused into a maternal vein before cesarean delivery. Maternal blood samples were obtained during the course of the study. Umbilical venous and arterial samples were obtained from the clamped segment of the cord. There were no differences between the 2 groups for fetal and placental weights and for fetal oxygenation and acid-base balance. RESULTS: Maternal amino acid concentrations increased significantly in the group receiving infusions. Significant increases in umbilical venous concentrations were observed for most amino acids, except for histidine and threonine. The amino acid umbilical arteriovenous differences per mole of oxygen (AA/O(2) ratio) increased significantly for leucine, isoleucine, valine, methionine, phenylalanine, arginine, glycine, serine, alanine, and proline. There were no significant increases for lysine, histidine, and threonine. CONCLUSION: An increase in maternal concentrations leads to an increase in the delivery of most amino acids to the fetus.
Authors: Anna Maria Marconi; Valentina Mariotti; Cecilia Teng; Stefania Ronzoni; Barbara D'Amato; Alberto Morabito; Frederick C Battaglia Journal: Am J Obstet Gynecol Date: 2009-12-21 Impact factor: 8.661
Authors: Claire E Hart; Valerie Race; Younes Achouri; Elsa Wiame; Mark Sharrard; Simon E Olpin; Jennifer Watkinson; James R Bonham; Jaak Jaeken; Gert Matthijs; Emile Van Schaftingen Journal: Am J Hum Genet Date: 2007-03-30 Impact factor: 11.025
Authors: Priyadarshini Pantham; Fredrick J Rosario; Mark Nijland; Alex Cheung; Peter W Nathanielsz; Theresa L Powell; Henry L Galan; Cun Li; Thomas Jansson Journal: Am J Physiol Regul Integr Comp Physiol Date: 2015-08-05 Impact factor: 3.619
Authors: Paul J Rozance; Michelle M Crispo; James S Barry; Meghan C O'Meara; Mackenzie S Frost; Kent C Hansen; William W Hay; Laura D Brown Journal: Am J Physiol Endocrinol Metab Date: 2009-07-14 Impact factor: 4.310