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Background and Objectives: To investigate the impact of age on arterial stiffness and blood pressure (BP) variables in newly diagnoseduntreated hypertension (HT). Subjects and Methods: A total of 144 patients with newly diagnosed untreated HT were divided into two groups: young group (age≤50 years, n=71), and old group (age >50 years, n=73). BP variables were measured on office or 24 hours ambulatory BP monitoring(ABPM). Parameters of arterial stiffness were measured on pulse wave velocity (PWV). Pulse wave analysis (PWA) was compared. Results: Although office BP and pulse pressure (PP) were significantly (p<0.05) higher in the young group than in the old group, BP and PPon ABPM were not significantly different. Central systolic BP and PP, augmentation pressure, augmentation index on PWA, and PWV weresignificantly higher or faster in the old group compared to that in the young group. Age showed significant positive correlation with bothPWV and PWA variables in the young group with HT. However, age only showed significant positive correlation with PWV in the old groupwith HT. In the young group with HT, PWA variable showed better correlation with age than PWV. Conclusion: Considering BP levels on ABPM, office BP is prone to be overestimated in young patients with HT. Parameters of arterial stiffnessmeasured by PWV and PWA were more affected by age rather than by BP level in patients with HT. Therefore, PWA variable might be amore sensitive marker of arterial stiffness in young patients with HT. However, PWV might be a better marker for old patients with HT.

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