Hensel, Ole, Pfrommer, Laura, Furch, Peggy et al. · MMW Fortschritte der Medizin · 2026 · DOI
This narrative review summarises research on long-COVID, focusing on two common symptoms: post-exertional malaise (PEM, a worsening of symptoms after exertion) and postural tachycardia syndrome (POTS, a heart-rate and blood-pressure dysregulation when standing). The authors report that PEM and POTS are observed in a large proportion of long-COVID patients and discuss both non-medication and medication-based management approaches. However, as a review article, this summary reflects the current state of published literature rather than presenting new primary research evidence.
By analogy, since long-COVID and ME/CFS share phenotypic overlap (both feature PEM and autonomic dysfunction in some patients), this inventory of post-COVID research findings may inform understanding of similar symptom clusters in ME/CFS. However, the relevance of long-COVID-specific prevalence and mechanism claims to ME/CFS remains unclear, as the two conditions may have distinct aetiologies and pathophysiology. This review underscores that PEM and dysautonomia are not unique to one post-infectious condition and warrant comparable clinical attention across conditions.
This review does not establish causation or provide mechanistic proof; it surveys published literature without conducting new experiments. It does not demonstrate that prevalence estimates (86%, 82%) generalise beyond the specific cohorts cited in underlying primary studies, nor does it establish that pacing or symptomatic treatments are effective—only that they have been proposed or reported. The review does not confirm organic versus functional aetiology in individual patients, and the claim of 'SARS-CoV-2-related organic origin' is an interpretation, not a proven fact derived from the review itself.
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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