Methods and Techniques for Increasing the Accuracy of Continuous Non-invasive Blood Pressure Measurement Under Dynamic Loads

Abstract

In this paper, various methods for measuring blood pressure (BP) are considered and discussed in detail. Among those, we focus on the indirect BP measurement using the volume clamp method (VC). We considered a hardware solution using the SAKR-2 (Ltd Intox) device for non-invasive BP measurement. Based on our experimental results, this solution is well suited to BP dynamics measure for the patients both at rest and during movement. Specifically, by analyzing the characteristics of multiple measured results in different scenarios, we have proposed several post-processing techniques to remove the systematic errors during measurements (e.g., due to the measurement condition) and enhance accuracy. Compared to the conventional direct BP measurement methods in the radial artery (RA) using commercial device (S5 monitor), both systolic blood pressure (SBP) and diastolic blood pressure (DBP) indicators have strong relationship. The measured BP shifts with respect to hydrostatic changes in blood pressure are fairly match to the theoretical predetermined value during repetitive measurements.