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Figure 2 Effect of alpha-adrenergic blocking on orthostatic blood pressure change. The dotted bars show the supine blood pressure (upper edge = systolic blood pressure; lower edge = diastolic blood pressure) and the solid bars show the orthostatic blood pressure during tilting test. The values within the arrows show the orthostatic blood pressure change (systolic/diastolic) by tilting test. The baseline orthostatic blood pressure increase was significantly higher in the orthostatic hypertension group than in the normal group (systolic blood pressure/diastolic blood pressure: 24/8.6 mm Hg vs. 1.5/2.5 mm Hg, both p < 0.01).