Construction of a general model for estimating blood pressure using independent components of facial skin temperature in consideration of the mechanism of variation

The objective of this study was to construct a general model for estimating blood pressure (BP) using independent components of facial skin temperature in consideration of its mechanism of variation. In our previous study, we constructed models for estimating cardiac-dominant BP variation by applying an independent component analysis, which was a blind source separation algorithm, to facial skin temperature. However, these models were constructed using individual independent components of facial skin temperature, and a general model for estimating BP, which is a simplex model for estimating BP from facial skin temperatures in general population is necessary for practical use. In contrast, the mechanism of variation in BP is roughly classified into cardiac and vascular-dominant patterns, and revealed that the facial skin temperature distribution was different between the mechanisms of variation in BP. In this study, a general model using facial skin temperature during cardiac and vascular-dominant patterns, and both mechanisms of variation in BP was constructed and evaluated. As a result, the general models in both mechanisms of variation in BP could be estimated with the highest accuracy in each general model. Hence, a general model for estimating BP in consideration of its mechanism of variation could be constructed.