Continuous blood pressure measurement by using the pulse transit time: comparison to a cuff-based method

Abstract

Pulse transit time (PTT) and pulse wave velocity (PWV), respectively, were shown to have a correlation with systolic blood pressure (SBP) and have been reported to be suitable for indirect BP measurements. The aim of this study was to create a function between SBP and PWV, and to test its reliability for the determination of absolute SBP using a non-linear algorithm and a one-point calibration. 63 volunteers performed exercise to induce rises in BP. Arterial PTT was measured between the R-spike of the ECG and the plethysmographic curve of finger pulse-oximetry. The reference BP was measured using a cuff-based sphygmomanometric aneroid device. Data from 13 of the 63 volunteers served for the detection of the PWV-BP relationship. The created non-linear function was used to calculate BP values after individual correction for the BP offset in a group of 50 volunteers. Individual correlation coefficients for SBP measured by PTT (SBP(PTT)) and by cuff (SBP(CUFF)) varied between r = 0.69 and r = 0.99. Taking all data together, we found r = 0.83 (276 measurements in 50 volunteers). In the Bland-Altman plot, the limits of agreement were [Formula: see text]± 19.8 mmHg. In conclusion, comparing SBP values using the PTT-based method and those measured by cuff resulted in a significant correlation. However, the Bland-Altman plot shows relevant differences between both methods, which are partly due to greater variability of the SBP(PTT) measurement during intensified exercise. Results suggest that PTT can be used for measuring absolute SBP when performing an individual correction for the offset of the BP-PWV relation.

Study on Cardiovascular and Respiratory Responses Relevant to Tactile Softness Evaluation

“…As reported, the variations of PWTT correlate well with the variations of BP [6][7][8]. On the basis of the above results, we suppose that the variations of BP will change in different ways when deformable materials perceived to be different in tactile softness are compressed.…”

Effects of slow and regular breathing exercise on cardiopulmonary coupling and blood pressure

“…There is a significant difference in PTT baseline between the SB section and the PB section at 7 BPM (from 172.8 ± 20.1 to 176.8 ± 19.2 ms, p < 0.001). As PTT is inversely proportional to BP [10,41], the increase in the PTT baseline also suggests the beneficial effect of the SPB procedure to cardiovascular system. Figure 6 shows an illustration of the variations of PTT, SBP and DBP during the SPB procedure (from the same subject with Fig.…”

Non-image forming effects of illuminance level: Exploring parallel effects on physiological arousal and task performance

“…PWTT values were transformed into SBP values using the formula developed by Gesche et al [52]. This formula included the participants" body height and calibrated values of the SBP measured by an automatic blood pressure device developed by Beurer [53].…”