Timing and dosage of intrapartum prophylactic penicillin for preventing early-onset group B streptococcal disease: Assessing maternal and umbilical cord blood concentration

Stine Yde Nielsen*, Elke Hoffmann-Lücke, Tine Brink Henriksen, Camilla Mirian Hartvigsen, Rikke Bek Helmig, Mohammed Rohi Khalil, Jens Kjølseth Møller, Lars Henning Pedersen, May Murra, Eva Greibe

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Objective: Timing of administration of antibiotics and concentrations in maternal blood and the umbilical cord blood are important prerequisites for optimal intrapartum antibiotic prophylaxis (IAP) of neonatal early-onset group B streptococcus (GBS) disease. This cohort study aimed to explore penicillin concentrations in mothers and infants at birth in relation to time elapsed from administration to delivery and to the minimal inhibitory concentration (MIC) for GBS. Main outcome measures: Penicillin G concentrations in maternal and umbilical cord blood in relation to time and dose from administration to time of delivery. Results: In 44 mother-infant dyads, median maternal penicillin G concentration was 0.2 mg/L (IQR 0-0.8 mg/L; range 0-1.6 mg/L). Median infant penicillin G concentration was 1.2 mg/L (IQR 0.5-5.0 mg/L; range 0-12.7 mg/L). In all infants (N=38) born less than 4 hours after the latest IAP administration, penicillin G concentrations far exceeded MIC (0.125 mg/L), even after short time intervals between IAP administration and birth. The highest plasma concentrations were reached in umbilical cord blood within 1 hour from IAP administration to birth. For 44 mother-infant dyads, maternal concentrations were very low compared with their infants'; particularly, very high concentrations were seen in the 20 infants with only one dose of IAP. Conclusion: High concentrations of penicillin G were found in umbilical cord blood of infants born less than 4 hours after IAP administration, well above the MIC for GBS.

Original languageEnglish
JournalArchives of Disease in Childhood: Fetal and Neonatal Edition
ISSN1359-2998
DOIs
Publication statusE-pub ahead of print - 2024

Keywords

  • Neonatology
  • Sepsis

Fingerprint

Dive into the research topics of 'Timing and dosage of intrapartum prophylactic penicillin for preventing early-onset group B streptococcal disease: Assessing maternal and umbilical cord blood concentration'. Together they form a unique fingerprint.

Cite this