Placental Transfer of Rifampin and Rifabutin
Author Information
Author(s): Kevin P. Magee, David Wimberley, Caren Crane, Sohrab Sobhi, Roger E. Bawdon
Primary Institution: University of Texas Southwestern Medical Center
Hypothesis
The study aims to determine the ex vivo human placental transfer of rifampin and rifabutin.
Conclusion
Rifabutin has a greater clearance than rifampin but accumulates less in fetal circulation due to its higher tissue deposition.
Supporting Evidence
- Rifabutin had a significantly higher clearance index than rifampin at both tested concentrations.
- Rifabutin's higher lipophilicity allows it to cross the placenta more readily than rifampin.
- Despite higher tissue concentrations, rifabutin showed less accumulation in fetal circulation compared to rifampin.
Takeaway
This study looked at how two antibiotics, rifampin and rifabutin, move from a mother to her baby through the placenta. It found that rifabutin moves more easily into the placenta but doesn't get to the baby as much as rifampin does.
Methodology
The study used an ex vivo single cotyledon perfusion system with placentas from uncomplicated, term deliveries to measure the clearance indices of rifampin and rifabutin.
Limitations
The study had a small sample size and the statistical significance of some findings was not reached due to high variability.
Participant Demographics
Placentas from uncomplicated, term vaginal or cesarean deliveries.
Statistical Information
P-Value
0.01 for rifabutin vs. rifampin at 1.0 pg/ml; 0.05 for rifabutin vs. rifampin at 10.0 pg/ml
Statistical Significance
p<0.05
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