Measurement of aortic arch distension wave with the echo-track technique.

The aim of this study was to use the echo-track method for measuring aortic arch diameter, distension waveform and elastic parameters. Data were obtained from 50 healthy volunteers of 32 +/- 15 y (mean +/- 1 SD). The aortic arch was interrogated from the suprasternal position with M-mode ultrasonography using a 3.5-MHz transducer; diameter and distension waves were determined by means of an echo-track algorithm (WTS, Pie Medical); arterial blood pressure was measured in the arm with sphygmomanometry. Aortic arch diameter, distension, distensibility and compliance were 24.55 +/- 2.99 mm, 2199 +/- 726 micrometer, 3.9 +/- 1.4. 10(-3) mmHg(-1) and 1.86 +/- 0.61 mm(2). mmHg(-1), respectively. Intrasession, interobserver and intersession variability was less than 10%, 10% and 18%, respectively. It is concluded that aortic arch distension wave can be recorded noninvasively with acceptable reproducibility, allowing assessment of aortic elastic parameters, and yielding insight into pressure wave reflection within the arterial system.