Fig. 1. Patterns of changes in systolic BP. Upper line is a schematic representation and lower line shows data from an example patient with orthostatic hypotension. SOH is defined as occurring when a patient has a relatively stable systolic BP after it has decreased within 3 minutes of tilting. POH is defined by a continuous decrease in BP extending beyond 3 minutes of tilting. OHPR is defined by an incomplete recovery in BP (remaining ≥20 mm Hg below baseline) within 5 minutes of tilting. TOH is defined by a recovery in BP to a level that no longer satisfies the definition of OH (i.e., within 20 mm Hg of baseline). BP: blood pressure, OHPR: orthostatic hypotension with partial recovery, POH: progressive orthostatic hypotension, SOH: sustained orthostatic hypotension, TOH: transient orthostatic hypotension.