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Caffeine pharmacokinetics following umbilical vein injection during delayed cord clamping in preterm lambs

Abstract

Background

Spontaneous breathing during and after delayed cord clamping (DCC) stabilizes cardiopulmonary transition at birth. Caffeine stimulates breathing and decreases apnea in premature newborns. We evaluated the pharmacokinetics and physiological effects of early caffeine administration-direct injection into the umbilical vein (UV) during DCC or administered through a UV catheter (UVC) after delivery.

Methods

Eighteen extremely premature lambs (125–127d, term gestation 145d) were exteriorized and instrumented. Lambs received caffeine-citrate at high (40 mg/kg) or standard-dose (20 mg/kg) via direct UV (DUV) injection during DCC, or via the UVC.

Results

Mean peak plasma caffeine concentrations were lower with high-dose DUV compared to UVC (18 ± 4.3 vs. 46 ± 12 mg/L, p < 0.05). With standard-dose caffeine, mean peak plasma levels were 7.48 ± 2.6 with DUV and 28.73 ± 9.4 mg/L with UVC. The volume of distribution was higher in the DUV group compared to UVC (2.5 ± 1.0 vs. 0.69 ± 0.15 L/kg) with an estimated 39 ± 18% entering the maternal circulation. Maternal peak concentrations were 0.79 ± 0.71 and 1.43 ± 0.74 mg/L with standard and high-dose DUV, respectively.

Conclusions

Caffeine injected directly into the UV during DCC is feasible but achieves lower concentrations due to high volume of distribution including maternal circulation. Further trials evaluating DUV caffeine injection should use higher caffeine doses.

Impact

  • Respiratory stimulation with early caffeine may reduce the need for intubation in preterm infants.

  • In the preterm lambs, caffeine injection directly into the umbilical vein during delayed cord clamping is feasible.

  • Plasma caffeine concentrations are less than half when administered directly into the umbilical vein during delayed cord clamping compared to administration via an umbilical venous catheter following birth likely attributed to a larger volume of distribution or injection site leak.

  • There were no significant hemodynamic alterations following caffeine injection.

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Fig. 1: Plasma caffeine concentrations.

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Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was made possible thanks to the UC Davis Department of Pediatrics Resident and Fellow Grant.

Funding

NIH/NICHD 5R01HD072929-10 (SL).

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Authors and Affiliations

Authors

Contributions

L.Z., S.L., and P.V. designed the study. H.K., A.L., H.J., M.H.; E.G. and D.K. contributed to data acquisition. Data analysis and interpretation was performed by L.Z., H.K., S.L. and P.V.; L.Z. wrote the first draft of the manuscript. A.L., E.G., D.S., S.L. and P.V. critically revised the manuscript for important intellectual content. All the authors have approved the approved the final version of the manuscript submitted for publication and agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. All persons designated as authors qualify for authorship, and all those who qualify for authorship are listed.

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Correspondence to Payam Vali.

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Zeinali, L., Giusto, E., Knych, H. et al. Caffeine pharmacokinetics following umbilical vein injection during delayed cord clamping in preterm lambs. Pediatr Res (2024). https://doi.org/10.1038/s41390-024-03117-3

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