Orthostatic hypotension was defined as SBP drop at least 20 mmHg or DBP drop at least 10 mmHg within 3 min of the standing position compared with the supine position.
Recently, an international consensus group defined supine hypertension in patients with neurogenic orthostatic hypotension as brachial SBP at least 140 mmHg and/or DBP at least 90 mmHg while supine.
Orthostatic hypotension-related hospitalizations were predicted by age [per 1-year increase, hazard ratio 1.14, 95% confidence interval (CI): 1.12-1.16], smoking (hazard ratio 1.35, 95% CI: 1.12-1.64), diabetes (hazard ratio 1.50, 95% CI: 1.00-2.25), baseline orthostatic hypotension (hazard ratio 1.45, 95% CI: 1.05-1.98), in particular, by SBP fall at least 30 mmHg (hazard ratio 3.93, 95% CI: 2.14-7.23), whereas syncope hospitalizations by age (per 1-year increase, hazard ratio 1.09, 95% CI: 1.07-1.11), smoking (hazard ratio 1.27, 95% CI: 1.08-1.49), and hypertension (hazard ratio 1.42, 95% CI: 1.20-1.69).
After analysis by sex and adjustment for conventional risk factors, the β1 -AR Gly389 homozygote conferred about a 3-fold risk of OH and independently predicted a 6.5 mm Hg greater orthostatic SBP decrease (GG -8.9±13 mm Hg vs CC+CG -2.4±12 mm Hg, P<.001) only in female hypertensive patients.