Rowe, P C, Bou-Holaigah, I, Kan, J S et al. · Lancet (London, England) · 1995 · DOI
This study looked at whether a condition called neurally mediated hypotension—where blood pressure drops suddenly when standing up—might be causing chronic fatigue in some patients. Researchers tested seven teenagers with severe fatigue using a tilt-table test (which gradually tilts the body upright) and found that all seven experienced significant drops in blood pressure. Four of these patients improved when treated with specific heart medications, suggesting this condition may contribute to some cases of ME/CFS.
This study suggests a potentially treatable physiological mechanism underlying some ME/CFS symptoms, which could explain why certain patients experience post-exertional fatigue and orthostatic stress. If neurally mediated hypotension is confirmed as a contributing factor in ME/CFS subsets, it could lead to targeted diagnostic testing and pharmaceutical interventions for symptomatic relief.
This small case series does not establish that neurally mediated hypotension causes ME/CFS in most patients, nor does it prove causation rather than coincidental association. The lack of a control group means we cannot determine whether similar hypotensive responses occur in healthy adolescents. The improvement in four patients does not rule out placebo effect or other concurrent treatments.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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