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The associated infographic with this paper contains an error: In the table guiding management based on lactate the recommendation for a patient with a lactate >4 mmol/L is to "Consider IV fluids", whereas the recommendation for a lactate <2 mmol/L is to "Give IV fluid bolus injection".
This appears to be a transcription error from the recommendation in the original paper and associated NICE guidance, but is concerning given the prominence of this "decision making tool" as described in the article; though I note the disclaimer reports "This infographic is not a clinical decision aid".