High central pulse pressure is independently associated with adverse cardiovascular outcome the strong heart study.

OBJECTIVES

This study was designed to facilitate clinical use of central pulse pressure (PP). We sought to determine a value that might predict adverse outcome and thereby provide a target for assessment of intervention strategies.

BACKGROUND

We previously documented that central PP more strongly relates to carotid hypertrophy and extent of atherosclerosis and, more importantly, better predicts incident cardiovascular disease (CVD) than brachial PP.

METHODS

Radial applanation tonometry was performed in the third Strong Heart Study examination to determine central blood pressure. Cox regression analyses were performed using pre-specified covariates and quartiles of central and brachial PP.

RESULTS

Among 2,405 participants without prevalent CVD, 344 suffered CVD events during 5.6 +/- 1.7 years. Quartiles of central PP (p < 0.001) predicted outcome more strongly than quartiles of brachial PP (p = 0.052). With adjustment for covariates, only the event rate in the fourth quartile of central PP (> or =50 mm Hg) was significantly higher than that in the first quartile (hazard ratio [HR]: 1.69, 95% confidence interval [CI]: 1.20 to 2.39, p = 0.003). Central PP > or =50 mm Hg was related to outcome in both men (HR: 2.06, 95% CI: 1.39 to 3.04, p < 0.001) and women (HR: 2.03, 95% CI: 1.55 to 2.65, p < 0.001); in participants with (HR: 1.84, 95% CI: 1.41 to 2.39, p < 0.001) and without diabetes (HR: 1.91, 95% CI: 1.29 to 2.83, p = 0.001); and in individuals younger (HR: 2.51, 95% CI: 1.59 to 3.95, p < 0.001) and older (HR: 1.53, 95% CI: 1.19 to 1.97, p = 0.001) than the age of 60 years.

CONCLUSIONS

Central PP > or =50 mm Hg predicts adverse CVD outcome and may serve as a target in intervention strategies if confirmed in other populations and in prospective studies.