Abstract
Introduction
Lidocaine is an effective drug for the treatment of neonatal convulsions not responding to traditional anticonvulsant therapy. However, one of the side-effects is a risk of cardiac arrhythmias. The aim of this study was to develop an optimal dosing strategy with minimal risk of cardiac arrhythmias.
Materials and methods
As a first step, we studied 20 neonates during routine treatment of neonatal seizures with lidocaine. All were given a loading dose of 2 mg/kg in 10 min, followed by the continuous infusion of 6 mg/kg per hour for 12 h, 4 mg/kg per hour for 12 h and finally 2 mg/kg per hour for 12 h. Effectiveness, cardiac toxicity and lidocaine plasma concentrations were then determined.
Results
No cardiac arrhythmias were observed, and lidocaine was effective in 76% of the treatments. In most of the treatments (13 out of 20) maximal lidocaine plasma concentrations were >9 mg/L. Plasma levels >9 mg/L have been related to cardiac toxicity when used as an anti-arrhythmic drug in adults. It was of interest that all preterm infants showed high lidocaine plasma levels. Secondly, we developed the optimal dosing regimen, which was defined as an infusion regimen at which maximal lidocaine plasma concentrations are <9 mg/L. Simulations with the developed pharmacokinetic model indicated a reduction in the infusion duration of lidocaine at 6 mg/kg per hour from 12 to 6 h. Thirdly, the new lidocaine dosing regimen was evaluated. Fifteen neonates (16 treatments) were studied. No cardiac arrhythmias were observed, and lidocaine was effective in 78% of the treatments. In most of the treatments (11 out of 16) maximal lidocaine plasma concentrations were <9 mg/L. Again preterm infants showed relatively high lidocaine plasma levels.
Conclusion
A new lidocaine dosing schedule was developed. This new regimen should have a lower risk of cardiac arrhythmias and appears to be as effective in term infants. For preterm infants the optimal regimen needs to be determined.
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Abbreviations
- aEEG:
-
Amplitude-integrated electroencephalogram
- CI:
-
Confidence interval
- CL:
-
Total plasma clearance
- CV:
-
Coefficient of variation
- FPIA:
-
Fluorescence polarization immunoassay
- GX:
-
Glycinexylidide
- HPLC:
-
High-performance liquid chromatography
- MEGX:
-
Monoethylglycinexylidide
- NICU:
-
Neonatal intensive care unit
- OFV:
-
Objective function value
- V:
-
Volume of distribution
- WT:
-
Weight
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Acknowledgements
The authors thank the Department of Clinical Pharmacy and Toxicology of the Leiden University Medical Centre, Leiden, The Netherlands for the analysis of plasma levels of lidocaine, MEGX and GX.
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Malingré, M.M., Van Rooij, L.G.M., Rademaker, C.M.A. et al. Development of an optimal lidocaine infusion strategy for neonatal seizures. Eur J Pediatr 165, 598–604 (2006). https://doi.org/10.1007/s00431-006-0136-x
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DOI: https://doi.org/10.1007/s00431-006-0136-x