[Influence of nail polish on pulse oximeter readings of oxygen saturation: a systematic review].

EN Nail polish has traditionally been assumed to absorb light emitted by pulse oximeters and to interfere with the detection and measurement of oxygenated hemoglobin. In a systematic review of the literature we aimed to assess the influence of nail polish on the measurement of oxygen saturation by pulse oximetry (SpO2). A search protocol for online databases (MEDLINE, Embase, Web of Science, Scopus, Cumulative Index to Nursing and Allied Health Literature, and IBECS [the Spanish health sciences index]) was established to find clinical trials or observational studies published between 1999 and February 2014. Twelve nonrandomized clinical trials were found. Ten were in healthy volunteers. One of the remaining 2 studies was in critical patients undergoing mechanical ventilation, and the other was in patients with stable chronic obstructive pulmonary disease. One study recreated the low oxygen level of high altitudes, while the others were done in normal atmospheric conditions. Differences between pulse oximeters and type of nail polish were found. Nail polish was associated with a statistically significant decrease in SpO2 for at least 1 color in all but 2 studies. However, the differences were within the standard error (±2.0%) of the pulse oximeters used. The authors of the studies all concluded that although nail polish might change SpO2 readings significantly, the variations are not clinically significant.

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