Plasma concentrations of oseltamivir and oseltamivir carboxylate in critically ill children on extracorporeal membrane oxygenation support.
BACKGROUND
To evaluate the effect of extracorporeal membrane oxygenation (ECMO) support on pharmacokinetics of oseltamivir and oseltamivir carboxylate (OC) in children.


METHODS
Steady state 0-12 hour pharmacokinetic sampling was performed in new influenza A (H1N1) infected children treated with oseltamivir while on ECMO support. Cmax, Cmin and AUC(0-12 h) were calculated. The age-specific oseltamivir dosage was doubled to counter expected decreased plasma drug concentrations due to increased volume of distribution on ECMO support.


RESULTS
Three patients were enrolled aged 15, 6 and 14 years in this pharmacokinetic case series. For two children the OC plasma concentrations were higher than those found in children and adults not on ECMO. These increased plasma concentrations related to the increased oseltamivir dosage and decreased kidney function. In one patient suboptimal plasma concentrations coincided with a decreased gastric motility.


CONCLUSIONS
Oseltamivir pharmacokinetics do not appear to be significantly influenced by ECMO support. Caution is required in case of nasogastric administration and decreased gastric motility. Due to the limited number of (paediatric) patients available further multicenter studies are warranted.
Intensive Care and Department of Paediatric Surgery, Erasmus MC - Sophia Children's Hospital, Rotterdam, The Netherlands.
Enno D
ED
Wildschut
Matthijs
M
de Hoog
Maurice J
MJ
Ahsman
Dick
D
Tibboel
Albert D M E
AD
Osterhaus
Pieter L A
PL
Fraaij
D000293:Adolescent; D000998:Antiviral Agents / Q000097:blood* / Q000493:pharmacokinetics; D019540:Area Under Curve; D002648:Child; D016638:Critical Illness; D015199:Extracorporeal Membrane Oxygenation; D005260:Female; D006801:Humans; D008297:Male; D053139:Oseltamivir / Q000031:analogs & derivatives* / Q000097:blood* / Q000493:pharmacokinetics; D011446:Prospective Studies
D000998:Antiviral Agents; D053139:Oseltamivir; C535162:oseltamivir carboxylate