British Journal of Anaesthesia, Vol 79, Issue 1 64-67, Copyright © 1997 by The Board of Management and Trustees of the British Journal of Anaesthesia
R. G. Hahn and C. Svensen
Changes in the volume of the fluid space expanded by i.v. infusion of
Ringer's acetate solution have been analysed recently using mathematical
models. Data obtained by such analyses allow simulation of the dilution of
the plasma volume during infusion of the solution at different rates. To
obtain basic kinetic data for such simulations, the plasma dilution-time
curves were measured during and after i.v. infusion of Ringer's solution 25
ml kg-1 over 30 min in 15 healthy male volunteers (mean age 31 yr) and over
30, 45 and 80 min in six females (mean age 32 yr). Based on these
experiments, nomograms were constructed from which the rate of infusion of
Ringer's solution and the infusion time required to obtain a defined plasma
dilution in both males and females can be estimated together with the
infusion rate needed to maintain the dilution at the level reached.
CLINICAL INVESTIGATIONS
Plasma dilution and the rate of infusion of Ringer's solution
Karolinska Institute, Department of Anaesthesia, Soder Hospital, S-118 83 Stockholm, Sweden
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