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Metabolic effects of three different inotropic strategies in the newborn piglet myocardium.
MedLine Citation:
PMID:  23186323     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
INTRODUCTION: Neonates undergoing congenital heart surgery frequently need post-operative inotropic support. Knowledge about the effect of inotropes on myocardial metabolism in the newborn heart is limited, and the choice of inotropic therapy is based mainly on evidence from studies in adults. The aim of this study was to compare the effect of three inotropic strategies on the myocardial metabolism in a neonatal pig model. METHODS: Newborn piglets were randomised to intravenous infusions with: adrenaline and milrinone; dopamine and milrinone; dobutamine in haemodynamically equivalent doses; or isotonic saline, through 3 h. Microdialysis catheters were inserted in the myocardium of the left and right ventricle, and concentrations of lactate, pyruvate, glycerol, and glucose were measured in the microdialysate. In myocardial biopsies, tissue lactate and intracellular glycogen concentrations were determined, and arterial blood samples were analysed for lactate and glucose. RESULTS: No statistically significant differences were observed in haemodynamics between the three interventions. Metabolic variables demonstrated a consistent increase in lactate concentration in blood, myocardial dialysate, and biopsies in milrinone-adrenaline-treated animals. The lactate concentration remained stable in all other groups in all samples. The myocardial lactate/pyruvate ratio did not increase and was not significantly different between groups. CONCLUSION: Milrinone and adrenaline induced significantly higher lactate levels in neonatal piglets. The increase was not caused by myocardial ischaemia, but rather due to a beta-stimulation-induced glycolysis.
Authors:
P D Colding; L M Kolstrup; J A Hyldebrandt; M R Schmidt; H E Bøtker; H B Ravn
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-27
Journal Detail:
Title:  Acta anaesthesiologica Scandinavica     Volume:  -     ISSN:  1399-6576     ISO Abbreviation:  Acta Anaesthesiol Scand     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370270     Medline TA:  Acta Anaesthesiol Scand     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 The Authors. Acta Anaesthesiologica Scandinavica © 2012 The Acta Anaesthesiologica Scandinavica Foundation.
Affiliation:
Department of Anaesthesiology and Intensive Care Medicine, Aarhus University Hospital, Skejby, Denmark.
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