Positional Change in Blood Pressure and 8-Year Risk of Hypertension

Thomas, Randal J.; Kiang Liu; Jacobs Jr., David R.; Bild, Diane E.; Kiefe, Catarina I.; Hulley, Stephen B.
August 2003
Mayo Clinic Proceedings;Aug2003, Vol. 78 Issue 8, p951
Academic Journal
• Objective: To assess the relationship between positional blood pressure change and 8-year incidence of hypertension in a biracial cohort of young adults. • Subjects and Methods: Participants from the Coronary Artery Risk Development in Young Adults (CARDIA) study with complete data from year 2 (1987-1988), year 5 (1990-1991), year 7 (1992-1993), and year 10 (19951996) examinations were included (N=2781). Participants were classified into 3 groups based on their year 2 systolic blood pressure response to standing: drop, a decrease in systolic blood pressure of more than 5 mm Hg; same, a change of between -5 and +5 mm Hg; and rise, more than 5-mm Hg increase. • Results: The number of participants in each group was as follows: drop, 741; same, 1590; and rise, 450. The 8year incidence of hypertension was 8.4% in the drop group, 6.8% in the same group, and 12.4% in the rise group (P<.001). Adjusted odds ratios for developing hypertension during the follow-up period in the rise group vs the same group were as follows: in black men, 2.85 (95% confidence interval [CI], 1.43-5.69), in black women, 2.47 (95% CI, 1.19-5.11), in white men, 2.17 (95% CI, 1.004.73), and in white women, 4.74 (95% CI, 1.11-20.30). • Conclusions: A greater than 5-mm Hg increase in blood pressure on standing identified a group of young adults at increased risk of developing hypertension within 8 years. These findings support a physiologic link between sympathetic nervous system reactivity and risk of hypertension in young adults.


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