P6.10 SENSITIVITY OF WAVE SEPARATION IN THE ARTERIES TO ERRORS IN ESTIMATING WAVE SPEED

DOI

10.1016/j.artres.2013.10.191How to use a DOI?

Abstract

Objectives: Examine the effect of erroneous estimation of wave speed (C) on the magnitude and time of the separated pressure (P) and velocity (U) in arteries.

Methods: Pressure and flow were measured in the aorta of 11 dogs and C has been determined using the PU-loop technique. The waves were separated into the forward and backward directions using wave intensity analysis (WIA), with C varying from C-99C% to C+99C%. The following parameters were studied: a) Peak of forward (P+, U+) and backward (P−, U−) pressure and velocity waveforms, b) The onset and peak times of P+, U+, P−, and U− all with respect to ventricular ejection time.

Results: Incorrect values of C resulted in an inaccurate estimation of the P_± and U_±. An error of (+,−)50% in C results in an amplitude error of 7,7% in P₊, 6, 8% in P−, 20, 60% in U+ and 30, 116% in U−. Also, an error of (+,−) 50% in C results in an error in peak time of 7, 11% for P+, 15, 5% for P−, 7, 10% for U+ and 2, 20% for U−. Incorrect determination of C did not affect the onset of the forward waves while it resulted in error of 47,47% for P− and 38,38% for U− (Figure 1,2).

Conclusions: The separation of P and U waveforms using WIA is sensitive to changes of C, whose correct estimation is important for the accurate determination of the magnitude and peak time of the forward and backward waveforms.

Open Access

This is an open access article distributed under the CC BY-NC license.

TY  - JOUR
AU  - J.L. Tassone
AU  - A.W. Khir
PY  - 2013
DA  - 2013/11/11
TI  - P6.10 SENSITIVITY OF WAVE SEPARATION IN THE ARTERIES TO ERRORS IN ESTIMATING WAVE SPEED
JO  - Artery Research
SP  - 156
EP  - 156
VL  - 7
IS  - 3-4
SN  - 1876-4401
UR  - https://doi.org/10.1016/j.artres.2013.10.191
DO  - 10.1016/j.artres.2013.10.191
ID  - Tassone2013
ER  -