• Christian G Nielsen, Milda Grigonyte-Daraskeviciene, Mikkel T Olsen, Morten H Møller, Kirsten Nørgaard, Anders Perner, Johan Mårtensson, Ulrik Pedersen-Bjergaard, Peter L Kristensen, and Morten H Bestle.
• Department of Anesthesiology and Intensive Care, Copenhagen University Hospital-North Zealand, Hilleroed, Denmark. Christian.gantzel.nielsen@regionh.dk.
• Intensive Care Med. 2024 Oct 17.

PurposeGlycemic control poses a challenge in intensive care unit (ICU) patients and dysglycemia is associated with poor outcomes. Continuous glucose monitoring (CGM) has been successfully implemented in the type 1 diabetes out-patient setting and renewed interest has been directed into the transition of CGM into the ICU. This scoping review aimed to provide an overview of CGM accuracy in ICU patients to inform future research and CGM implementation.MethodsWe systematically searched PubMed and EMBASE between 5th of December 2023 and 21st of May 2024 and reported findings in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guideline for scoping reviews (PRISMA-ScR). We assessed studies reporting the accuracy of CGM in the ICU and report study characteristics and accuracy outcomes.ResultsWe identified 2133 studies, of which 96 were included. Most studies were observational (91.7%), conducted in adult patients (74%), in mixed ICUs (47.9%), from 2014 and onward, and assessed subcutaneous CGM systems (80%) using arterial blood samples as reference test (40.6%). Half of the studies (56.3%) mention the use of a prespecified reference test protocol. The mean absolute relative difference (MARD) ranged from 6.6 to 30.5% for all subcutaneous CGM studies. For newer factory calibrated CGM, MARD ranged from 9.7 to 20.6%. MARD for intravenous CGM was 5-14.2% and 6.4-13% for intraarterial CGM.ConclusionsIn this scoping review of CGM accuracy in the ICU, we found great diversity in accuracy reporting. Accuracy varied depending on CGM and comparator, and may be better for intravascular CGM and potentially lower during hypoglycemia.© 2024. Springer-Verlag GmbH Germany, part of Springer Nature.

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