Gorman, Gráinne S, Elson, Joanna L, Newman, Jane et al. · Neuromuscular disorders : NMD · 2015 · DOI
This study found that fatigue is very common and severely disabling in people with mitochondrial disease. About 62% of patients reported excessive fatigue, and 32% experienced severe fatigue that significantly limited their daily activities—levels comparable to fatigue in ME/CFS patients. The researchers surveyed 132 patients and compared their fatigue levels to healthy people and ME/CFS patients to understand how widespread and serious this problem is.
This study demonstrates that fatigue in mitochondrial disease reaches severity levels comparable to ME/CFS, suggesting shared pathophysiological mechanisms or symptom presentations warrant investigation. Understanding fatigue across these conditions could identify common therapeutic targets and validate patient experiences across diagnostic boundaries.
This cross-sectional study cannot establish causality or identify the specific biological mechanisms causing fatigue in mitochondrial disease. The comparison to ME/CFS patients does not prove the conditions share identical underlying mechanisms, only that perceived fatigue severity is similar. The study's postal survey format cannot assess whether comorbid conditions (anxiety, depression, sleepiness) are causes, consequences, or independent correlates of fatigue.
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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