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A. Bauer, B. Hametner, T. Weber, S. Wassertheurer:
"Comparison of ejection durations derived from radial and brachial pressure waves";
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; 95 - 96.

Purpose
The ejection duration (ED) is an important indicator of ventricular function as well as ventricular arterial coupling. Thus, the non-invasive oscillometric determination of ED from arterial pressure waves could enhance methods of pulse wave analysis. The aim of this work was to test and to validate the calculation of ED based on measurements from tow different devices (brachial oscillometry and radial tonometry).
Methods
138 pluse wave measurements from 79 patients were obtained in direct succession with the Mobil-O-Graph (IEM, Germany) and with the Sphygmocor device (AT Cor Medical Pty. Led., Australia) in a comarative study. An algorithm based on numerical derivates was developed to determine the ejection duration from the arterial pulse wave. For both measurements, the ED was calculated and the ED from the internal algorithm of the Sphygmocor was obtained.
Results
the mean ED of the internal Sphygmocor algorith (Sphylnt) is 309+-27 ms, of the calculated ED form the Mobil-O-graph measurements (Mob) 304+-29 ms. So, the mean differences between Mob and SphyInt are -4+-20ms, see figure, and between Mob and Sphy are -3+-26ms. The sampling rates of Sphyphygmocor and Mobil-O-Graph are 128 respectively 100 Hz, so the mean errors are below the particluar step sizes.

http://dx.doi.org/10.1016/j.artres.2017.10.151