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• W4297035722 abstract "With current recommendation for phenobarbitone dosing, we have noted that babies are extremely sedated with elevated serum phenobarbitone levels. We postulate that asphyxiated neonates with hypoxic liver injury have impaired drug metabolism and renal injury affects drug elimination, thus elevating serum drug levels. Therapeutic hypothermia (TH) could further affect the drug levels.To determine the serum levels of the phenobarbitone in babies receiving different loading doses of phenobarbitone for neonatal seizures and to study the effect of asphyxia and TH on drug levels.Prospective observational cohort study.Term neonates with seizures of any cause were given phenobarbitone up to a maximum loading of 40 mg/kg followed by maintenance dose of 5 mg/kg/day. Serum phenobarbitone levels were assessed after 4 h of the initial loading dose and subsequently at 24, 48 and 72 h from the time after maximum loading dose. Babies were divided into three groups Group 1 (HIE + TH-hypoxic ischemic encephalopathy undergoing TH), Group 2 (HIE - TH-hypoxic ischemic encephalopathy without TH) and Group 3 (non-HIE group).A total of 47 babies completed the study. Twenty-three (49%) received 20 mg/kg, 14 (30%) received 30 mg/kg and 10 (21%) received 40 mg per kg of phenobarbitone as loading dose. HIE was the major cause of seizures 28 (59%) followed by hypoglycemia 7 (14%), cerebral malformations 4 (8%), inborn errors of metabolism 2 (4%) and hypocalcemia 1 (2%) while the cause of seizures was not known in 6 (13%). Median (IQR) Phenobarbitone levels at 72 h in babies who received 20 mg/kg loading dose of phenobarbitone was 46.72 (44.02-50.49) mcg/ml in HIE + TH group, 40.53 (28.66-65.09) mcg/ml in HIE - TH group and 49 (37-65) mcg/ml in non-HIE group. After a loading dose of 30 mg/kg, phenobarbitone level was 63.76 (59.5-65.94) mcg/ml in HIE + TH group, 42.5 (34.75-48.75) mcg/ml in HIE - TH group and 42.07 (40-49.05) mcg/ml in non-HIE group. After 40 mg/kg loading dose, it was 62.3 (60.2-64.9) mcg/ml in HIE + TH group, 57.0 (49.8-60.2) mcg/ml in HIE - TH group and 48.15 (40.8-50.97) mcg/ml in non-HIE group. In babies who received >20 mg/kg loading dose, 100% of HIE + TH, 80% of HIE - TH and 60% of non-HIE had supratherapeutic levels of phenobarbitone.At higher loading doses of 30 and 40 mg/kg, steady state concentration of serum phenobarbitone is higher in babies with hypoxic ischemic encephalopathy who underwent TH than in babies with non-HIE causes of seizures. Loading dose beyond 20 mg/kg should be used with close monitoring of serum drug level.Seizures are common in new born period and the most common cause of seizures is due to impaired blood and oxygen supply to brain. Phenobarbitone is the drug of choice for new born seizures. With the current recommended dosage for phenobarbitone (40 mg/kg), we have noticed that babies are drowsier and their blood levels of phenobarbitone are more than the normal expected range. The reason for these observations may be due to impaired processing of drug by the body due to decreased oxygen supply to liver and kidney. Whole body cooling which is a proven treatment intervention for babies with asphyxia can also alter drug metabolism. We conducted a study to assess the effect of whole-body cooling and hypoxia on the serum phenobarbitone levels. Babies who received phenobarbitone for seizures were divided into three groups. Group 1, seizures due to hypoxia who underwent whole body cooling, Group 2, seizures due to hypoxia but no whole body cooling and Group 3, seizures due to causes other than hypoxia. We found that 100% babies in Group 1 and 80% in Group 2 and 60% in Group 3 had higher levels of phenobarbitone in blood at more than 20 mg/kg loading dose." @default.
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• W4297035722 date "2022-08-04" @default.
• W4297035722 modified "2023-09-28" @default.
• W4297035722 title "Comparing the effect of different loading doses of phenobarbitone on serum phenobarbitone levels in babies with neonatal seizures and effect of therapeutic hypothermia on phenobarbitone levels" @default.
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• W4297035722 doi "https://doi.org/10.1093/tropej/fmac078" @default.
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