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Updated: Jun 27, 2026

Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis
Published on: August 17, 2022
Using body weight as a pre-hospital fluid infusion device: the relationship between under-body position and flow rate
1Military Reader in Anaesthesia, Royal Centre for Defence Medicine. j.l.tong@bham.ac.uk
Abstract:
This study was designed to identify the most effective underbody position when using the patient's own body weight as an infusion device. Twenty volunteers had an air-less 500 ml bag of saline located at various under-body positions. Mean pressures and flow rates through a 14G cannula were measured in vitro at room temperature. Locating the fluid bag at the buttock cleft delivered the highest mean flow rate at 135 ml/min. This underbody position may provide flow rates sufficient to achieve the clinical aim of fluid resuscitation in the military pre-hospital environment.
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