Assessment of preoperative fluid depletion using bioimpedance analysis |
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| Authors: | Ackland G L Singh-Ranger D Fox S McClaskey B Down J F Farrar D Sivaloganathan M Mythen M G |
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| Institution: | 1 Centre for Anaesthesia, 2 Department of Surgery, and 3 Day Surgery Unit, University College London Hospitals, London W1T 3AA, UK. 4 Portex Professor of Anaesthesia and Critical Care, Institute of Child Health, University College London, Guildford Street, London WC1, UK |
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| Abstract: | Background. Fluid depletion during the perioperative periodis associated with poorer outcome. Non-invasive measurementof total body water by bioimpedance may enable preoperativefluid depletion and its influence on perioperative outcome tobe assessed. Methods. Weight and foot bioimpedance were recorded under standardizedconditions in patients undergoing bowel preparation (n=43) orday surgery (n=44). Fifteen volunteers also followed standardnil-by-mouth instructions on two separate occasions to assessthe variabilities of weight and bioimpedance over time. Results. Body weight fell by 1.27 kg (95% CI 1.03–1.50kg; P<0.0001) and foot bioimpedance increased by 51 ohm afterbowel preparation (95% CI 36–66; P<0.0001). Weightchange after the nil-by-mouth period in day-surgery patients(mean –0.22 kg, 95% CI –0.05 to –0.47 kg;P=0.07) correlated (r=–0.46; P=0.005) with an increasein bioimpedance (16 ohms, 95% CI 5–27 ohms; P=0.01). Nodifference between two separate bioimpedance measurements wasseen in the volunteer group. Conclusions. Further work is warranted to determine if bioimpedancechanges may serve as a useful indicator of perioperative fluiddepletion. Br J Anaesth 2004; 92: 134–6 |
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| Keywords: | complications dehydration fluid balance fluid depletion measurement techniques bioimpedance analysis surgery day surgery gastrointestinal |
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