Validation of New and Existing Decision Rules for the Estimation of Beat-to-Beat Pulse Transit Time

Figure 1

The PTT estimation using simultaneous noninvasive measurements of pressure waveform in the respective arm arteries. (a) Schema of pulse signals acquisition. (b) Brachial arterial pressure signal. (c) Radial arterial pressure signal. (d) Differential signals of brachial/radial pulse signals using the first-order derivative. (e) Differential signals of brachial/radial pulse signals using the second-order derivative. (f) Coefficients of slope sum function of two channel signals. In this example, the PTT is calculated by the first-order differential method, and is the beat number. See text for abbreviation.