An increase in heart rate is often noted when there is a change in posture. sudden drop in blood pressure (Naschitz & Rosner, 2007; Winslow, Lane, & Woods, 1995; Smith, Porth, & Erickson, 1994). differential diagnosis for OH. while no change in heart rate may point to a neurogenic cause (Naschitz, & Rosner, 2007).
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