Assessment of Systolic Arterial Pressure Using Diameter Waveforms: 24-Hour Conscious Sheep Study

Abstract

The aim of this study was to evaluate the methodology to assess systolic arterial pressure using diameter waveforms. For this purpose we instrumented a sheep with invasive aortic pressure and diameter sensors. Four experiences were performed, in which both signals were recorded during 24 hours with the animal in conscious stage. Two calibration methods were considered: linear calibration and iterative exponential approach. When comparing the estimates of systolic aortic pressure with the measured values, errors of 1.3% and 0.5% were obtained for linear and exponential calibration, respectively. Both methods resulted effective to estimate systolic blood pressure with errors lower than 2%.