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Pharmacokinetics of amrinone in neonates and infants.

Abstract：

OBJECTIVE:To evaluate the pharmacokinetics of amrinone and its metabolites in neonates and infants after reconstructive surgery for congenital heart disease. DESIGN:Prospective study. SETTING:Pediatric intensive care unit in a university hospital. PARTICIPANTS:Fifteen neonates aged less than 1 month with transposition of the great arteries and 14 infants aged 2 to 6 months with complete atrioventricular septal defect. INTERVENTIONS:Amrinone, loading dose of 2 mg/kg, was administered before weaning from cardiopulmonary bypass, followed by a maintenance infusion of 7.5 microg/kg/min. MEASUREMENTS AND MAIN RESULTS:Blood samples to determine plasma concentrations of amrinone, N-acetylamrinone, and N-glycolylamrinone were drawn before amrinone administration, frequently after the loading dose, every 6 hours during the maintenance infusion, and until 48 hours after the end of the infusion. Amrinone clearance was 2.4 +/- 0.9 mL/kg/min in neonates and 3.2 +/- 1.2 mL/kg/min in infants (p < 0.05). The volume of distribution at steady-state was smaller (p < 0.05) in neonates than in infants. The elimination half-life of amrinone was 10.7 +/- 6.7 hours in neonates and 6.1 +/- 1.4 hours in infants (p < 0.05). There was a linear correlation between the clearance of amrinone and the body surface area (r = 0.67; p < 0.05). The ratio of the plasma concentration of N-acetylamrinone to that of amrinone did not differ between neonates and infants. CONCLUSIONS:Amrinone is eliminated at a slower rate in neonates than in infants. The rate of acetylation of amrinone appears to be similar; the differences in the elimination capacity of amrinone are mainly due to the immature renal function in neonates.

journal_name

J Cardiothorac Vasc Anesth

journal_title

Journal of cardiothoracic and vascular anesthesia

authors

Laitinen P,Ahonen J,Olkkola KT,Peltola K,Rautiainen P,Räsänen J

doi

10.1053/jcan.2000.7922

keywords:

subject

Has Abstract

pub_date

2000-08-01 00:00:00

pages

378-82

issue

4

eissn

1053-0770

issn

1532-8422

pii

S1053-0770(00)24219-5

journal_volume

14

pub_type

杂志文章

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