Ampicillin for neonatal group B streptococcal prophylaxis: How rapidly can bactericidal concentrations be achieved?

S. L. Bloom, S. M. Cox, R. E. Bawdon, L. C. Gilstrap

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

OBJECTIVE: Our purpose was to determine how rapidly bactericidal concentrations of ampicillin against group B streptococci are achieved in amniotic fluid and cord blood after a 2 gm maternal infusion. STUDY DESIGN: Ampicillin was administered at varying time intervals between 3 and 67 minutes before elective cesarean delivery in 40 women. Samples of amniotic fluid were obtained by amniocentesis just before the uterine incision was made. Umbilical and maternal blood were obtained at the time of delivery. Ampicillin concentrations were measured by high-pressure liquid chromatography. RESULTS: The mean concentrations of ampicillin measured in maternal and umbilical cord sera all exceeded the minimum bactericidal concentrations reported for group B streptococci (0.25 to 2.0 μg/ml) and were achieved as soon as 5 minutes after ampicillin infusion. Similarly, bactericidal levels of ampicillin in the amniotic fluid could be detected as early as 5 minutes. However, such concentrations of ampicillin in the amniotic fluid were achieved in only 85% of the pregnancies studied. CONCLUSIONS: Bactericidal levels of ampicillin against group B streptococci can usually be achieved rapidly in both fetal blood and amniotic fluid after a standard 2 gm intravenous dose given to the mother for neonatal prophylaxis.

Original languageEnglish (US)
Pages (from-to)974-976
Number of pages3
JournalAmerican Journal of Obstetrics and Gynecology
Volume175
Issue number4 I
DOIs
StatePublished - 1996

Fingerprint

Ampicillin
Amniotic Fluid
Streptococcus agalactiae
Mothers
Fetal Blood
Umbilicus
Amniocentesis
Umbilical Cord
High Pressure Liquid Chromatography
Pregnancy
Serum

Keywords

  • Ampicillin
  • group B streptococci
  • prophylaxis

ASJC Scopus subject areas

  • Medicine(all)
  • Obstetrics and Gynecology

Cite this

Ampicillin for neonatal group B streptococcal prophylaxis : How rapidly can bactericidal concentrations be achieved? / Bloom, S. L.; Cox, S. M.; Bawdon, R. E.; Gilstrap, L. C.

In: American Journal of Obstetrics and Gynecology, Vol. 175, No. 4 I, 1996, p. 974-976.

Research output: Contribution to journalArticle

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