Factors contributing to the accuracy of initial screening values measured by noninvasive spectrophotometric hemoglobin monitoring in an Emergency Department
Objective: Spectrophotometric hemoglobin (SpHb) monitoring is a new noninvasive technology for measuring hemoglobin (Hb). However, few studies have assessed the usefulness of the initial screening SpHb values, especially when measured in an Emergency Department. In this study, we examined the correlation between the initial screening SpHb values and laboratory-measured hemoglobin (Hb) concentrations.
Design: This was a retrospective, single center study.
Setting: Emergency Department in a University hospital.
Patients: 105 cases between February and July 2016.
Interventions: The correlation between SpHb and Hb was determined in univariate analysis. Multiple regression analysis was then performed with ΔHb (defined as the absolute difference between SpHb and Hb [|SpHb-Hb|]) as the dependent variable to identify factors associated with reduced accuracy of SpHb.
Results: The initial screening SpHb value was only moderately correlated with Hb in univariate analysis (r=0.736, p<0.001). In multiple regression analysis, male sex and diastolic blood pressure were significantly associated with ΔHb (p=0.003 and p=0.022, respectively).
Conclusions: The initial screening SpHb value was only moderately correlated with Hb. SpHb might affected by patient factors, including male sex and diastolic blood pressure.