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Noninvasive monitors of blood pressure in the critically ill: what are acceptable accuracy and precision?

We read with interest the study by Drs Ilies et al., comparing blood pressure (BP) measurements by the noninvasive CNAP technology (for Continuous Noninvasive Arterial Pressure) with intra-arterial measurements, in the aftermath of cardiovascular surgery. The authors analysed more than 11 000 measurements of BP collected in more than 100 patients and they should be congratulated for this effort.