P2.45 Evaluation of Central Blood Pressure and Augmentation Index in Patients with Isolated Ambulatory and Isolated Office Hypertension: The Vobarno Study

Abstract

Different BP patterns have been identified by the use of office and 24 hours BP measurement: sustained normotension (NT), isolated office hypertension (IOH), isolated ambulatory hypertension (IAH) and hypertension (HT). Pulsewave analysis has been proposed for evaluation of central BP; “augmentation index” (AIx) is an accepted indirect index of arterial stiffness. Aim of our study was to assess the relationships between PWA and BP patterns in a general population in Northern Italy. Methods In 242 untreated subjects (-age 54±9 yrs, BMI 25±4, 47% males) radial artery applanation tonometry and PWA were used to derive central aortic pressures and AIx. All subjects underwent laboratory examinations and clinic and 24 h BP measurement.-Subjects were divided into subgroups: NT (office BP<140/90 and 24 h BP<125/80 mmHg), IOH (office BP≥140/90 and 24h BP<125/80 mmHg), IAH (office BP<140/90 and 24h BP≥125/80 mmHg) and HT (office BP≥140/90 and 24h BP≥125/80 mmHg).

Results

Patients with IAH and HT were older than NT (59.5±8.4 and 55.3±9.3 vs 51.1±6.4 yrs p<0.01). BMI was higher in IOH and HT than in NT (25.5±3.9 and 26.8±4.3 vs 23.7±3.3, p<0.01). After adjusting for confounding variables (including also mean BP and HR) AIx was significantly higher in IOH, IAH and HT in comparison to NT (31.1±1.0, 30.8±1.8, 31.3±1.0 vs 26.6±1.0, p<0.01). Central SBP was significantly higher in HT, but also in IOH and IAH, than in NT (HT 120.3±0.7, IOH 120.6±0.7, IAH 121.0±1.2 vs NT 117.8±0.7 mmHg, p<0.01).Conclusion: In a general population sample central SBP and AIx are greater in patients with sustained, office or ambulatory hypertension. In IAH, despite normal brachial BP, central BP is significantly increased, possibly contributing to increase cardiovascular risk.