Postural Tachycardia Syndrome: The hallmark of this syndrome is an exaggerated heart rate increase in response to postural change without hypotension.

Clinical symptoms of POTS widely vary and are nonspecific: dizziness, lightheadness, weakness, blurred vision, and fatigue in an orthostatic nature.

Other diagnoses in this differential consider:

  • Autonomic neuropathies
  • Central dysautonomias
  • Bedrest deconditioning
  • Medications
  • Hypovolemia