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Introduction: Pulse oximetry may overestimate arterial oxyhemoglobin saturation Sao2 at low Sao2 levels in individuals with darkly pigmented skin, but other factors, such as gender and oximeter probe type, remain less studied. Methods: We studied the relationship between skin pigment and oximeter accuracy in 36 subjects 19 males, 17 females of a range of skin tones. Semisupine subjects breathed air-nitrogen-CO2 mixtures via a mouthpiece to rapidly achieve 2- to 3-min stable plateaus of Sao2. Comparisons of Sao2 measured by pulse oximetry Spo2 with Sao2 by Radiometer OSM-3 were used in a multivariate model to assess the source of errors.
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