P2.21: Agreement of Central Blood Pressure Measured by Applanation Tonometry and Echotracking

Background Some studies have shown the interest of measuring central blood pressure (CBP). Usually measured non-invasively through a function transfer by applanation tonometry (Sphygmocor®) CBP can also be calculated by echotracking (Art.Lab®) at the common carotid artery assuming the fact that the distension waveform is similar to a pressure curve and thus be more precise. However, the agreement between CBP derived from these two devices remains not clear. Objectives To analyse the agreement between CBP and study the discrepancies between the two techniques. Materials and methods 74 Patients from Pharmacology Department in Paris and from Surgery, Medical, Molecular, and Critical area pathology Department at Pisa university were matched for age, sex and BP. CBP was estimated by the onboard transfer function of the Sphygmocor® derived from radial measurement. Echotracking measurements were performed on right CCA (ART.LAB) and treated to obtain CBP. Pearson’s correlation and Bland&Altman graph were performed for carotid SBP and PP, and multivariate regressions to found the determinants of discrepancies. Results The correlations between the carotid BP were good (SBP: r = 0.79; PP: r = .77, p