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M. Ebner, K. Parker, T. Vercauteren, S. Ourselin, S. Wassertheurer, A. Hughes, B. Hametner:
"Calculating reservoir pressure with or without flow information: Similarity and algorithmic sensitivity at radial artery";
Talk: Artery Conference 2017, Pisa; 2017-10-12 - 2017-10-14; in: "Artery Conference 2017", J. Cockroft, S. Laurent, C. Vlachopoulos (ed.); Artery 2017, 20/Elsevier (2017), ISSN: 1872-9312; 78 - 79.

Background
Reservoir pressure is typically estimated from the pressure waveform information only. comparability with estimates made using pressure and flow depend on assmptions, e.g. a proportional relationship between excess pressure and flow [1]. In this study, we compared (i) results using flow and pressure versus pressure-only at the radial artery, and (ii) two different algorithms used in the literature for pressure-only analysis.
Methods
Reservoir pressure separations were performed on 95 hypertensive individuals where radial pressure and flow velocity waveform measurements were available [2]. Algorith (F) used flow and pressure information [3]. Algorithms (P1) and (P2) refer to the two different pressure-only implementations as used in [4,5], and [1,6], respectively. Reservoir curves characterized by physiologically implausible parameters, i.e. a rate constant b < 0 or an asymptotic pressure P, were discareded, leaving 63 subjects with valid reservoir pressure data.
Results
Estimated reservoir parameters are shown in Table 1. Algorith (F) showed statistically sighificant differences in most of the parameters compared to (P1) and (P2), although, except time constant T differences were observed in reservoirs pulse pressur and area estimates between (P1) and (P2) despite their, in general high correlation.

http://dx.doi.org/10.1016/j.artres.2017.10.104