Abstract
Physiological calibration (Physiocal) improves the quality of continuous blood pressure (BP) signal from finger. However, the effects of Physiocal on spectral characteristics of systolic BP (SBP) variability are not well-known. We tested the hypothesis that the use of Physiocal may alter the results on SBP variability when compared with BP recording without Physiocal. Continuous BP was recorded simultaneously from fingers of both arms during 10-min standing by two Nexfin devices, one with (ON) and the other without (OFF) Physiocal (n = 19). Missing SBP values in ON signal were linearly interpolated over Physiocal sequences (ONinter). The OFF signal was analyzed without any corrections (OFFreference) and after linear interpolation of corresponding sequences when Physiocal appeared in the ON signal (OFFinter). Mean low frequency power of SBP oscillations (LFSBP, 0.04–0.15 Hz) did not differ between the OFFreference, OFFinter, and ONinter. However, LFSBP deviated more from OFFreference when analyzed from ONinter compared with the analysis from OFFinter [median (interquartile range): 14.7 (4.6–38.6) vs. 0.9 (0.5–1.8) %, p < 0.05]. In conclusion, the use of Physiocal had a significant effect on the spectral SBP variability that overwhelms the impact of linear interpolation of short data sequences. Therefore, caution is needed when comparing SBP variability between BP datasets acquired with and without Physiocal.
Highlights
The analysis of blood pressure (BP) variability in frequency domain provides important information on cardiovascular autonomic function in various physiological and clinical settings
Lower HFSBP and greater BRSHF were observed with one with (ON)-BPcorrinter compared with ONinter without BP correction
The present study showed that the use of Physiocal has a significant effect on the spectral components of systolic BP (SBP) variability and baroreflex sensitivity (BRS) that overwhelms the impact of linear interpolation of short data sequences
Summary
The analysis of blood pressure (BP) variability in frequency domain provides important information on cardiovascular autonomic function in various physiological and clinical settings. Together with time-synchronized recording of R-R intervals (RRi), continuous BP measurement enables the assessment of baroreflex sensitivity (BRS) which has provided significant prognostic information in clinical studies (Pagani et al, 1988; La Rovere et al, 1998). Continuous recording of arterial pressure from finger is applied, which has been validated against invasive methods (Imholz et al, 1998). LF oscillations of BP seem to amplify with the finger measurement compared with invasive recording which may be explained by complexity of the changes in peripheral vascular state (Omboni et al, 1993). BP data over ≥ 2 cardiac cycles are lost when Physiolcal is initiated
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