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Accuracy of a continuous noninvasive hemoglobin monitor in intensive care unit patients*

Frasca, Denis MD; Dahyot-Fizelier, Claire PhD; Catherine, Karen MD; Levrat, Quentin MD; Debaene, Bertrand MD; Mimoz, Olivier PhD

doi: 10.1097/CCM.0b013e3182227e2d
Clinical Investigations

Objective: To determine whether noninvasive hemoglobin measurement by Pulse CO-Oximetry could provide clinically acceptable absolute and trend accuracy in critically ill patients, compared to other invasive methods of hemoglobin assessment available at bedside and the gold standard, the laboratory analyzer.

Design: Prospective study.

Setting: Surgical intensive care unit of a university teaching hospital.

Patients: Sixty-two patients continuously monitored with Pulse CO-Oximetry (Masimo Radical-7).

Interventions: None.

Measurements and Results: Four hundred seventy-one blood samples were analyzed by a point-of-care device (HemoCue 301), a satellite lab CO-Oximeter (Siemens RapidPoint 405), and a laboratory hematology analyzer (Sysmex XT-2000i), which was considered the reference device. Hemoglobin values reported from the invasive methods were compared to the values reported by the Pulse CO-Oximeter at the time of blood draw. When the case-to-case variation was assessed, the bias and limits of agreement were 0.0 ± 1.0 g/dL for the Pulse CO-Oximeter, 0.3 ± 1.3g/dL for the point-of-care device, and 0.9 ± 0.6 g/dL for the satellite lab CO-Oximeter compared to the reference method. Pulse CO-Oximetry showed similar trend accuracy as satellite lab CO-Oximetry, whereas the point-of-care device did not appear to follow the trend of the laboratory analyzer as well as the other test devices.

Conclusion: When compared to laboratory reference values, hemoglobin measurement with Pulse CO-Oximetry has absolute accuracy and trending accuracy similar to widely used, invasive methods of hemoglobin measurement at bedside. Hemoglobin measurement with pulse CO-Oximetry has the additional advantages of providing continuous measurements, noninvasively, which may facilitate hemoglobin monitoring in the intensive care unit.

From the Centre Hospitalier Universitaire de Poitiers (DF, CDF, KC, QL, BD, OM), INSERM ERI 23 (DF, CDF, BD, OM), and Université de Poitiers, UFR de Médecine-Pharmacie (DF, CDF, BD, OM), Poitiers, France.

Supported, in part, by Masimo, who supplied the Radical-7 monitors and the sensors used for SpHb measurement. The manufacturer had no input into the design or conduct of this study or in the decision to submit the manuscript for publication.

The authors have not disclosed any potential conflicts of interest.

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© 2011 by the Society of Critical Care Medicine and Lippincott Williams & Wilkins