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Fluid flow through intravenous cannulae in a clinical model

McPherson, Duncan, Adekanye, Olukorede, Wilkes, Antony Robert and Hall, Judith Elizabeth 2009. Fluid flow through intravenous cannulae in a clinical model. Anesthesia and Analgesia 108 (4) , pp. 1198-1202. 10.1213/ane.0b013e3181966451

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Abstract

BACKGROUND: Predicting flow through an IV cannula is useful to clinicians if changes in flow are required and to guide selection of cannula. We sought the usefulness of manufacturers’ quoted flows in predicting actual flow and to characterize that flow. METHODS: We built a vein model and inserted cannulae between 14 and 20-gauge. In the first experiment, we compared the manufacturer’s quoted flows using deionized water, Hartmann’s solution and Gelofusine. In the second experiment, we varied the pressure feeding the cannula and measured the resulting flow. RESULTS: Flow through a cannula is not a simple ratio of the manufacturers’ quoted flow rate, even controlling for fluid type and feeding pressure. Flow is neither fully laminar, nor fully turbulent in the range of rates we have measured and in the International Organization for Standardization test. The Reynolds number is often below 2000. CONCLUSIONS: Flow through cannulae is not laminar at the upper range of clinically used flows, therefore Poiseuille’s law is not useful in predicting flow and the effect of changing radius is less than commonly believed. The quoted maximum flows are also not useful. There are many conditions for laminar flow apart from Reynolds number. Further work would determine useful predictors of flow.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: R Medicine > R Medicine (General)
R Medicine > RC Internal medicine
R Medicine > RD Surgery
Publisher: Lippincott, Williams & Wilkins
ISSN: 0003-2999
Related URLs:
Last Modified: 09 Apr 2018 19:58
URI: http://orca.cf.ac.uk/id/eprint/29660

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