Mathematical modelling of post-filter ionized calcium during citrate anticoagulated continuous renal replacement therapy

Innas Forsal, Anders Nilsson, Mikael Bodelsson, Anders Wieslander and Marcus Broman

PLOS ONE, 2021, vol. 16, issue 2, 1-16

Abstract: Background/Aims: Post-filter ionized calcium (iCa) measured on a blood gas analyzer (BGA) during regional citrate anticoagulated continuous renal replacement therapy (CRRT) are needed to control the regime. This increases the workload and requires attention including interpretation of blood analyses. Two algorithms were developed to calculate the post-filter iCa instead. The first algorithm used measured systemic total calcium and the second used a selected set of values from an initial blood gas sample as input. Methods: Calculated post-filter iCa values were compared to real blood gas analyses. 57 patients treated at the intensive care unit at Skåne University Hospital in Lund during 2010–2017 were included after applying inclusion and exclusion criteria. Clinical and machine parameters were collected from the electronic medical records. Non-quality checked data contained 1240 measurements and quality checked data contained 1034 measurements. Results: The first algorithm using measured systemic total calcium resulted in slightly better precision and trueness with an average difference between the predicted and measured post-filter iCa concentration of 0.0185±0.0453 mmol/L for quality checked data, p

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0247477

DOI: 10.1371/journal.pone.0247477

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