Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-8994
Silberschmidt, A L; Kühn-Velten, W N; Juon, A M; Zimmermann, R; von Mandach, U (2008). Nifedipine concentration in maternal and umbilical cord blood after nifedipine gastrointestinal therapeutic system for tocolysis. BJOG: An International Journal of Obstetrics & Gynaecology, 115(4):480-485.
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OBJECTIVE: To determine nifedipine concentrations in maternal plasma at steady state, and maternal and umbilical cord plasma at delivery, after tocolysis with nifedipine gastrointestinal therapeutic system (GITS) tablets. DESIGN: Prospective clinical pharmacokinetic study. SETTING: Department of Obstetrics at the Zurich University Hospital. POPULATION: Pregnant women treated for threatened preterm labour. METHODS: GITS dosage titrated to clinical response (30-150 mg/day). Nifedipine concentrations by high-performance liquid chromatography and turbo ion spray tandem mass spectrometry. MAIN OUTCOME MEASURES: Steady-state nifedipine concentrations in maternal blood and nifedipine concentrations in maternal and corresponding umbilical cord blood at delivery. RESULTS: Steady-state nifedipine concentrations (micrograms/l, mean +/- SE) were 54 +/- 6 (all doses, n = 31), 38 +/- 8 (60 mg/day, n = 13), and 92 +/- 12 (150 mg/day, n = 7) (P < 0.002). Umbilical cord and maternal concentrations both declined in a ln-linear regression with elimination half-lives of 20.4 and 17.4 hours. Linear regression showed a correlation between umbilical and maternal concentrations of 0.77 +/- 0.1 (n = 21, mean +/- SE). CONCLUSIONS: Steady-state plasma nifedipine concentrations after repeated dosing with nifedipine GITS 30-150 mg/day in pregnant women with preterm labour do not exceed 100 micrograms/l; fetal levels are 77% of maternal levels.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||04 Faculty of Medicine > University Hospital Zurich > Clinic for Obstetrics|
|Dewey Decimal Classification:||610 Medicine & health|
|Deposited On:||13 Jan 2009 10:02|
|Last Modified:||28 Nov 2013 00:40|
|Additional Information:||The definitive version is available at www.blackwell-synergy.com|
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