Postural orthostatic tachycardia syndrome

Postural orthostatic tachycardia syndrome (POTS) is a condition where a patient's heart rate substantially increases upon sitting or standing. It is a form of orthostatic intolerance (OI). Accompanying the heart rate acceleration, other symptoms, such as headaches, fatigue, sweating, nausea, fainting and dizziness may occur. POTS is associated with an increase in heart rate from the lying to upright position of greater than 30 beats per minute, or a heart rate of greater than 120 beats per minute within 10 minutes of standing.

A tilt table test can be used to diagnose POTS.

POTS in ME/CFS
POTS can be a co-morbid condition in ME/CFS patients. In a 2008 study done in the UK by the Northern CFS/ME Clinical Network, using the Fukuda criteria, 27% of the study population had POTS compared with 9% in the control population.The researchers concluded:"POTS is a frequent finding in patients with CFS/ME. We suggest that clinical evaluation of patients with CFS/ME should include response to standing. Studies are needed to determine the optimum intervention strategy to manage POTS in those with CFS/ME."

A 2011 study, by the Vanderbilt Autonomic Dysfunction Center (Vanderbilt University School of Medicine, Nashville, TN, U.S.A.), reported that 64% of the POTS population in the study also met the Centers for Disease Control & Prevention criteria for chronic fatigue syndrome.

Diagnosis of ME/CFS
The proposed SEID criteria has OI as a symptom but it is not necessary for a diagnosis as it is not always present. If the patient does not have OI they would have to have Cognitive Impairment (Cognitive dysfunction) to meet SEID criteria.

Lean more

 * POTS UK website

Studies

 * 2014, Postural Orthostatic Tachycardia With Chronic Fatigue After HPV Vaccination as Part of the “Autoimmune/Auto-inflammatory Syndrome Induced by Adjuvants”
 * 2013, What is brain fog? An evaluation of the symptom in postural tachycardia syndrome