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Introduction: Carotid-femoral pulse wave velocity (cfPWV) is widely used in clinical and epidemiological studies to assess central arterial stiffness and predict cardiovascular outcomes. However, cfPWV assessments require applanation of the carotid artery, which may be challenging in some patients, and assessments may be confounded in the presence of carotid artery plaque. Further, since cfPWV is not consistent with the path of blood flow, the measure is adjusted according to an assumed timing of the pressure wave traveling in the opposite direction. Therefore, we hypothesize that heart-femoral PWV (hfPWV) could be a simpler measure of central arterial stiffness that is consistent with the path of blood flow. Objective: To estimate the strength of the association between hfPWV and cfPWV. Methods: We evaluated 4,476 older-aged (75.2 y [SD: 5.0]) adults in the community-based Atherosclerosis Risk in Communities (ARIC) Study. cfPWV and hfPWV were measured using an automated cardiovascular screening device (Omron VP-1000plus) equipped with an electrocardiogram, a phonocardiogram, and 2 applanation tonometry sensors attached to carotid and femoral arteries. Agreement between the two measurements was determined by calculating the intraclass correlation coefficient (ICC) and the standard error of estimate (SEE). We considered ICC value estimates of <0.5, 0.5-0.75, 0.75-0.9, and >0.9 as, respectively, poor, moderate, good, and excellent agreement. The SEE represents the average distance that the observed values fall from the regression line. Smaller values indicate that the observations are closer to the fitted line. The uniformity of error was assessed by visual analysis of regression plot. Results: There was ‘good’ agreement between hfPWV and cfPWV (ICC = 0.83, 95%CI: 0.82, 0.84). While the mean cfPWV (11.6 m/s [SD: 3.0]) and hfPWV (11.5 m/s [SD: 2.3]) were comparable, the SEE was 1.3 (95%CI: 1.27, 1.33) m/s. Inspection of the regression plot revealed bias, with higher PWV further away from the regression line. Conclusions: The current findings suggest good agreement between cfPWV and hfPWV, indicating that hfPWV may be a suitable alternative to cfPWV. Since hfPWV does not require applanation of the carotid artery, the measurement is easier to conduct and may be particularly suited for use in individuals for whom applanation of the carotid artery is challenging.
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