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Relationship between each SI and SBP drop in patients with OH. The degree of correlation with fall in SBP decreased in the order of SI 3 > SI 2 > SI 4 > SI 5 > SI 6 > SI 1. Change of SBP means that the mean SBP values obtained while lying in the supine position for 10 min minus the mean SBP values obtained during upright posture for 20 min. OH = orthostatic hypotension, SBP = systolic blood pressure, SI = sympathetic index.
