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PubMed1975

Fetal acquisition and neonatal elimination of a large amount of salicylate. Study of a neonate whose mother regularly took therapeutic doses of aspirin during pregnancy.

The purpose of this study was to determine the amount of salicylate acquired by a newborn infant from a mother who took 6.5 gm of aspirin a day during her entire pregnancy, and to characterize the kinetics of salicylate elimination by the infant. This healthy female infant was born with a salicylic acid concentration of 25 mg/100 ml plasma and 75 mg/kg body weight. The drug was eliminated during the first 5 days of life, primarily in the form of salicyluric acid. Salicylate elimination was relatively slower than in normal adults, but more rapid than in newborn infants of mothers who had taken only one small dose of aspirin shortly before delivery. The apparent in vivo KM and Vmax for salicylurate formation, on a body weight basis, were at the adult level. The slower elimination of salicylate (relative to adults) by the infant was due to immaturity of the glucuronidation and renal excretory pathways.

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