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.

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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  -