alexa Impact of gestational age and birth weight on amikacin clearance on day 1 of life.
Pediatrics

Pediatrics

Journal of Neonatal Biology

Author(s): Michiel F Schreuder, Arend Bkenkamp, Joanna AE van Wijk

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BACKGROUND AND OBJECTIVES: Intrauterine growth restriction (IUGR) and prematurity are associated with a low nephron endowment. It can therefore be expected that neonates who are born premature and/or after IUGR have a lower GFR. Measurement of GFR in neonates is difficult, but the clearance of amikacin has been proven to be a reliable marker. We hypothesized that amikacin clearance is lower after IUGR or premature birth as a marker of low nephron endowment. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: Amikacin clearance was retrospectively analyzed in 161 neonates who received amikacin within the first 24 h of life. Using the MW/Pharm computer program, a population one-compartment model was calculated. The mean population pharmacokinetic parameters were individualized for each patient according to the maximum a posteriori Bayesian fitting method and provided the amikacin clearance. RESULTS: Our results show that birth weight z score and gestational age are correlated with the clearance of amikacin (partial correlation coefficient 0.159, P = 0.046, and 0.396, P < 0.001, respectively), after correction for other factors. CONCLUSIONS: We conclude that renal clearance on the first day of life is lower in neonates with a lower gestational age and/or birth weight z score. This indicates that both prematurity and IUGR impair GFR on the first day of life.

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This article was published in Clin J Am Soc Nephrol. and referenced in Journal of Neonatal Biology

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