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Intensive Care Medicine
Published in: Intensive Care Medicine 9/2004

01-09-2004 | Original

Bedside estimation of absolute renal blood flow and glomerular filtration rate in the intensive care unit

A validation of two independent methods

Authors: Kristina Swärd, Felix Valsson, Johan Sellgren, Sven-Erik Ricksten

Published in: Intensive Care Medicine | Issue 9/2004

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Abstract

Objective

To evaluate various treatment strategies in critically ill patients with ischaemic acute renal failure, there is a need for reliable bedside measurements of total renal blood flow (RBF), glomerular filtration rate (GFR) and renal oxygen consumption without the need for urine collection.

Design

The continuous renal vein thermodilution method and the infusion clearance techniques were validated against the gold standard technique, the urinary clearance of paraaminohippurate (PAH) and chromium ethylenediaminetetraacetic acid, respectively.

Setting

University hospital cardiothoracic ICU.

Patients

Seventeen uncomplicated mechanically ventilated post-cardiac surgical patients.

Interventions

None.

Measurements and results

Renal blood flow, GFR and the renal filtration fraction (FF) were measured for two consecutive 30-min periods by urinary clearance and compared with simultaneous measurements made by the thermodilution and infusion clearance techniques. Urinary clearance for PAH was corrected for by renal extraction of PAH. The within-group error, repeatability coefficient and the coefficient of variation were highest for the thermodilution technique and lowest for the infusion clearance technique with regard to RBF, GFR and FF. The infusion clearance technique had a higher agreement with the urinary clearance method than the thermodilution method. For estimations of RBF and GFR, the between-group errors were 33% and 43% comparing infusion clearance with urinary clearance and 65% and 67% comparing thermodilution with urinary clearance.

Conclusions

The infusion clearance method had the highest reproducibility and the highest agreement with the urinary clearance reference method. The renal vein thermodilution technique is less reliable in the ICU setting due to poor repeatability and poor agreement with the reference method.
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Metadata
Title
Bedside estimation of absolute renal blood flow and glomerular filtration rate in the intensive care unit
A validation of two independent methods
Authors
Kristina Swärd
Felix Valsson
Johan Sellgren
Sven-Erik Ricksten
Publication date
01-09-2004
Publisher
Springer-Verlag
Published in
Intensive Care Medicine / Issue 9/2004
Print ISSN: 0342-4642
Electronic ISSN: 1432-1238
DOI
https://doi.org/10.1007/s00134-004-2380-8

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