Understanding the stability of dopamine and dobutamine over 24 h in simulated neonatal ward conditions

kirupakaran, Katherine, Mahoney, Liam, Rabe, Heike and Patel, Bhavik A (2017) Understanding the stability of dopamine and dobutamine over 24 h in simulated neonatal ward conditions. Pediatric Drugs. ISSN 1174-5878

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Abstract

Objectives: Our objectives were to investigate the possible effects of temperature and light on the stability of dopamine and dobutamine continuous infusions over 24 h when prepared in a variety of dilution vehicles.

Methods: Syringe-driver infusion apparatuses were set up for dopamine and dobutamine diluted with either 0.9% sodium chloride (NaCl) or 5% glucose delivering 3 and 5 lg/kg/min, respectively, via 206-cm extension sets. All infusions were prepared for a neonate weight of 1 kg. Infusions were run over 24 h with approximately half the tubing within an incubator set at 35 C. Cyclic voltammetry was used to monitor the concentration of the inotrope within the syringe and at the end of the extension set, both initially and after 24 h.

Results: The variation in the concentration of dopamine and dobutamine in the vials (n = 6) was 3.58 and 1.22%, respectively. This variation increased to 10.88% for dopamine and 5.76% for dobutamine in the syringe. After 24 h, a significant reduction in the concentration of dopamine was observed at the end of the extension set when prepared in 0.9% NaCl versus 5% glucose (p\0.001; n = 6–7) and in dobutamine when prepared in 0.9% NaCl (p\0.001; n = 6–7). No differences in the concentration of dopamine prepared in 0.9% NaCl were observed after 24 h in lightexposed and light-protected extension sets (n = 6–7).

Conclusions Dobutamine is more stable in dilution vehicles than dopamine, and inotropes are more stable in the 5% glucose dilution vehicle than in 0.9% NaCl. Such findings will provide guidance on the choice of inotropes.

Item Type: Article
Schools and Departments: Brighton and Sussex Medical School > Clinical and Experimental Medicine
Subjects: R Medicine > RJ Pediatrics > RJ0251 Newborn infants Including physiology, care, treatment, diseases
Depositing User: Katie Isaac
Date Deposited: 19 May 2017 13:51
Last Modified: 29 Sep 2017 09:21
URI: http://sro.sussex.ac.uk/id/eprint/68151

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