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Topiramate concentrations in neonates treated with prolonged whole body hypothermia for hypoxic ischemic encephalopathy
Author(s) -
Filippi Luca,
La Marca Giancarlo,
Fiorini Patrizio,
Poggi Chiara,
Cavallaro Giacomo,
Malvagia Sabrina,
PellegriniGiampietro Domenico E.,
Guerrini Renzo
Publication year - 2009
Publication title -
epilepsia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.687
H-Index - 191
eISSN - 1528-1167
pISSN - 0013-9580
DOI - 10.1111/j.1528-1167.2009.02302.x
Subject(s) - topiramate , hypothermia , pharmacokinetics , anesthesia , medicine , encephalopathy , anticonvulsant , hyperthermia , epilepsy , psychiatry
Summary Purpose : Therapeutic hypothermia reduces mortality and neurologic impairment in neonates with hypoxic–ischemic encephalopathy. Topiramate exerts a neuroprotective effect in asphyxiated neonatal animal models. However, no studies have investigated the association of hypothermia and topiramate, because topiramate pharmacokinetics during hypothermia and the optimal administration schedule are unknown. The influence of hypothermia on topiramate pharmacokinetics was evaluated in asphyxiated neonates treated with prolonged whole‐body hypothermia and topiramate. Methods : Thirteen term newborns were treated with mild or deep whole body hypothermia for 72 h; all received oral topiramate, 5 mg/kg once a day for the first 3 days of life, and seven had concomitant phenobarbital treatment. Topiramate concentrations were measured on serial dried blood spots. Results : Topiramate concentrations were within the reference range in 11 of 13 newborns, whereas concentrations exceeded the upper limit in 2 of 13, both newborns on deep hypothermia. Topiramate concentrations reached a virtual steady state in nine newborns, for whom pharmacokinetic parameters were calculated. Values of topiramate maximal and minimal concentration, half‐life, average concentration, and area under the time—concentration curve resulted in considerably higher values than those reported in normothermic infants. With respect to normothermic infants, time of maximal concentration was mildly delayed and apparent total body clearance was lower, suggesting slower absorption and elimination. Pharmacokinetic parameters did not differ significantly between infants on deep versus mild hypothermia and in those on topiramate monotherapy versus add‐on phenobarbital. Conclusion : Most neonates on prolonged hypothermia treated with topiramate 5 mg/kg once a day exhibited drug concentrations within the reference range for the entire treatment duration.