Enoxaparin for neonatal thrombosis: a call for a higher dose for neonates

Thrombosis Research
Janet I MalowanyCanadian Paediatric Thrombosis and Hemostasis Network

Abstract

Enoxaparin is the current anticoagulant of choice for neonatal thrombosis. Present neonatal treatment guidelines of 1.5 mg/kg every 12 hours (q12 h) are extrapolated primarily from an earlier study with 9 infants less than 2 months of age. More recent studies indicate an increased dose requirement for neonates. Relevant data from articles and abstracts were identified by searching MEDLINE and pediatric and hematology conference proceedings. Publications between 1996 and 2007 included 8 papers, 4 abstracts and 1 review article with primary research documenting enoxaparin use in 240 neonates. The mean maintenance dose of enoxaparin ranged from 1.48 to 2.27 mg/kg q12 h for all infants, but was higher for preterm neonates at 1.9-2.27 mg/kg q12 h. The efficacy of enoxaparin, causing either complete or partial resolution was between 59 and 100%. Minor side effects were common and adverse events (major bleeding) occurred in 12 patients (0-19%). Increased experience with enoxaparin use in neonates in the past decade has indicated higher doses to achieve accepted target anti-factor Xa values. The long-term use of indwelling catheters (Insuflon catheter) for enoxaparin administration may need to be reevaluated in ELBW infants. Suggested ...Continue Reading

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