Orthostatic intolerance – an inability to remain in an upright sitting or standing posture without developing symptoms and needing to lie down – is common in ME/CFS.
The following articles on the topic were written by Cort Johnson and form part of the Phoenix Rising research archive.
- Orthostatic Intolerance I: The Evidence (2004) An explanation of the biological systems that play a role in upright posture and an examination of the evidence that orthostatic intolerance is a symptom in ME/CFS.
- Orthostatic Intolerance in CFS II – Types (2004) Examining the different types of orthostatic intolerance that occur in ME/CFS.
- Orthostatic Intolerance in CFS Pt. III – Possible Causes (2004) Investigation of various theories of the causes of orthostatic intolerance in ME/CFS.
- Orthostatic Intolerance in Chronic Fatigue Syndrome (ME/CFS) IV: A Biomarker? Plus Conclusions and Links (2004, updated 2007) Discussion of a 2000 paper by Naschitz and colleagues suggesting that ME/CFS patients have a specific pattern of ‘cardiovascular reactivity’ in response to orthostatic testing.