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Validation of a tonometric noninvasive arterial blood pressure monitor in the intensive care setting

Summary Intra‐arterial measurement is considered the gold standard for continuous, beat‐to‐beat arterial blood pressure monitoring. However, arterial cannulation can be difficult and may cause complications such as thrombosis and ischaemia. Recently, a tonometric system, the Colin CBM‐7000 has been developed for noninvasive beat‐to‐beat measurement of arterial blood pressure from the radial artery. We assessed the level of agreement between the CBM‐7000 and invasive radial artery measurements in 15 patients on a neuro‐intensive care unit. Agreement of systolic, diastolic and mean arterial pressure values was limited, with ≈ 34% of mean arterial pressures differing by over 10 mmHg. In many cases, this was due to a downward drift of the noninvasive measurements over time. Furthermore, there was a tendency to underestimate low pressures and overestimate high pressures. In our opinion, the Colin CBM‐7000 cannot be recommended for continuous blood pressure monitoring in the intensive care setting.