Influence of the pressure measuring site for velocity/pressure loops

Background: Velocity/pressure (Vel/P) loops are obtained by combining aortic blood velocity (measured by esophageal Doppler-ED-, CombiQ ™, Deltex Medical, Chichester, UK) and arterial pressure signals. They represent a tool to estimate afterload of the heart and arterial stiffness with at least two remarkable angles: β and γ. Pressure is usually measured in the radial artery (PRad) rather than in the descending thoracic aorta (P AoDesc) where ED measures blood flow. Our aims were to assess the influence of the site of pressure recording on the values of β and γ and to develop a mathematical transfer function (TF) to estimate PAoDesc from PRad and then reconstruct Vel/PTFAoDesc loops.

Source: Artery Research - November 25, 2016 Category: Cardiology Authors: Jona Joachim, Fabrice Vall ée, Arthur Le Gall, Stéphanie Lenck, Alexandre Mebazaa, Étienne Gayat Source Type: research