cardiovascular disorders
Orthostatic Hypotension
Postural orthostatic tachycardia syndrome (POTS)
POTS (also called postural autonomic tachycardia, or chronic or idiopathic orthostatic intolerance) is a syndrome of orthostatic intolerance in younger patients. POTS is defined by a heart rate of ≥ 120 beats/minute or an increase of ≥ 30 beats/minute when a patient moves from supine to a standing position. Various symptoms (eg, fatigue, light-headedness, exercise intolerance, cognitive impairment) and tachycardia occur upon standing; however, there is little or no fall in BP. The reason for symptoms is unclear. 