Initial Orthostatic Hypotension Causes (Transient) Postural Tachycardia

Lightheadedness upon rapid standing is common. If systolic/diastolic blood pressure (BP) are reduced by >40/20 mm Hg this is denoted “initial orthostatic hypotension” (IOH) ([Figure 1A][1]) [(1)][2]. Clinical history indicates rapid resolution of hypotension and is diagnostic of IOH. During