P134 A New Method for Non-invasive Measurement of Arterial Wave Intensity, Speed and Reflection

Introduction The ventricles accelerate and decelerate blood; the resulting disturbances propagate through the arterial system as waves. These waves contain clinically useful information: e.g. their magnitude and timing varies with cardiac performance and their speed depends on arterial stiffness. These properties can be studied using Wave Intensity Analysis (WIA) [ 1 ] and have been shown to be altered in heart failure [ 2 ]. Conventional WIA relies on invasive catheter measurements of blood pressure and velocity. We have developed and validated a new non-invasive ultrasound-based method that allows accurate WIA. Methods Employing a novel WIA formulation [ 3 ] based on diameter and velocity, and a ultrafast ultrasound imaging system (Verasonics, Kirkland, USA), wave intensity was measured in the abdominal aorta of rabbits. B-mode images were acquired at 1000 Hz, and diameter and velocity measured using standard cross-correlation techniques (the latter after spatio-temporal filtering to enhance the blood signal). Comparative measurements were made with a conventional WIA catheter-based system (Phillips Volcano, San Diego, USA). Ventricular dysfunction was induced by administering esmolol. Results Measured non-invasive peak wave intensities showed good agreement with catheter-based ones ( r = 0.73, p = 0.04, n = 8). Changes in the intensity and timing of the forward compression wave could be detected 1 minute after esmolol administration ( n = 10): peak intensity reduced by 30.3% ( p = 0.003) and was delayed 9.30 ms ( p =