By S. Dahan et al.
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Postural orthostatic tachycardia syndrome (POTS) is a heterogeneous disorder of the autonomic nervous system in which a change from the supine position to an upright position causes an abnormally large increase in heart rate or tachycardia (30?bpm within 10?min of standing or head-up tilt). This response is accompanied by a decrease in blood flow to the brain and hence a spectrum of symptoms associated with cerebral hypoperfusion. Many of these POTS-related symptoms are also observed in chronic anxiety and panic disorders, and therefore POTS is frequently under- and misdiagnosed.
Source: Dahan S, Tomljenovic L, Shoenfeld Y. Postural Orthostatic Tachycardia Syndrome (POTS) – A novel member of the autoimmune family. Lupus. 2016 Feb 3. pii: 0961203316629558. [Epub ahead of print]