Comparison of the accuracy of noninvasive hemoglobin monitoring for preoperative evaluation between adult and pediatric patients: a retrospective study

초록

We measured noninvasive hemoglobin (SpHb) levels during the pre-anesthesia visit in patients planning elective surgery. Differences between SpHb and laboratory-measured hemoglobin (Hb(lab)) were compared between adult and pediatric patients. In the pre-anesthesia visiting office, we routinely monitor noninvasive Hb levels with oxygen saturation and heart rate using Masimo Radical-7 (R) Pulse CO-Oximetry (Masimo Corp., Irvine, CA, USA). We attached the R1 20 (body weight, 10-50 kg) or R1 25 (body weight > 30 kg) probe on the index finger. After signal stabilization, SpHb and perfusion index (PI) were recorded. We retrospectively reviewed the recorded data and included patients who visited the anesthesiologist within 24 h after venous sampling. Bias was calculated by subtracting Hb(lab) from SpHb. We compared the biases of adult and pediatric patients (<18 years) and evaluated correlation coefficients between the bias and Hb(lab). Records of 105 patients were reviewed and 100 data points of 50 patients in each group were analyzed. The median +/- interquartile range bias was - 2.6 +/- 2.2 and -1.2 +/- 1.5 g/dL in adult and pediatric patients, respectively (P < 0.001); the corresponding mean +/- standard deviation PIs were 4.4 +/- 3.1 and 5.9 +/- 2.7, respectively (P=0.19). Bias was inversely proportional to Hb(lab) irrespective of age. The correlation coefficient between the bias and Hb(lab) was -0.81 in adults and -0.54 in pediatric patients (P < 0.001). SpHb and Hb(lab) measured during pre-anesthesia visits showed a smaller difference in pediatric than in adult patients. Lower Hb(lab) corresponded to higher accuracy.

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