Transplacental distribution of salbutamol enantiomers at Caesarian section

British Journal of Clinical Pharmacology
D W BoultonT M Fiddes

Abstract

To investigate the transplacental distribution of salbutamol enantiomers after administration of racemate to women prior to Caesarian section. Five women about to undergo elective Caesarian section were administered a single 0.25 mg bolus intravenous dose of (R,S)-salbutamol. The time from drug administration to delivery was different for each woman (27-105 min). Maternal and foetal umbilical cord venous blood samples were collected immediately after delivery and the plasma fraction analysed for salbutamol enantiomer concentrations by enantioselective high pressure liquid chromatography. The concentrations (mean +/- s.d.) of the active (R) enantiomer of salbutamol in cord and maternal plasma were 0.46 +/- 0.35 and 0.89 +/- 0.50 ng ml-1, respectively, and the difference was statistically significant (95% confidence interval (CI) of the difference: 0.12-0.74 ng ml-1). The corresponding concentrations of the (S) enantiomer of 0.92 +/- 0.45 and 1.11 +/- 0.67 ng ml-1, respectively, were not significantly different (95% CI of the difference -0.08-0.48 ng ml-1). The ratio of (R):(S) in cord plasma was significantly less than that in maternal plasma (P=0.016). Transplacental distribution of salbutamol enantiomers at Caesarian section a...Continue Reading

Citations

Jun 12, 1999·British Journal of Clinical Pharmacology·B BannwarthJ L Demarquez
Mar 10, 2001·Clinical Pharmacokinetics·D W Boulton, J P Fawcett
Mar 29, 2002·The Annals of Pharmacotherapy·Majid VakilyDion Brocks
Oct 17, 2008·International Journal of Gynaecology and Obstetrics : the Official Organ of the International Federation of Gynaecology and Obstetrics·Subramaniam VaniPeng Chiong Tan

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