E3 PreliminaryPreliminaryPEM unclearCase-ControlPeer-reviewedReviewed
Novel Oronasal Drainage for Long COVID: Proposed Mechanisms-Case Report.
Lorenz, Claudia, Frankenberger, Roland · Viruses · 2025 · DOI
Quick Summary
Researchers tested a new treatment called oronasal drainage (OND) for Long COVID, which involves a gentle abrasive therapy targeting the drainage areas in the nose and mouth. In one patient case, this treatment appeared to reduce various Long COVID symptoms and improve blood circulation to the hands. While these results are promising, the study was very small and more research is needed to confirm whether this treatment actually works.
Why It Matters
This study offers a novel mechanistic framework for understanding potential dysfunction in oronasal drainage and lymphatic clearance in Long COVID, conditions that may parallel dysfunction in ME/CFS. Given the overlap between Long COVID and ME/CFS populations, exploring new physiological targets and treatment approaches could benefit both patient communities, even as rigorous validation remains essential.
Observed Findings
- Patient reported reduction in various Long COVID symptoms following OND treatment
- Enhanced hand blood circulation was documented in the treated patient
- No serious adverse events were reported from the intervention
- Symptom improvement occurred following the novel oronasal drainage procedure
Inferred Conclusions
- OND may target a previously unrecognized physiological dysfunction in Long COVID through combined physiological, biochemical, and fluid mechanical mechanisms
- Further validation through controlled clinical trials is necessary to determine if observed improvements represent genuine treatment efficacy
- The proposed mechanism involving epipharyngeal and oronasal drainage warrants investigation in larger, more rigorous studies
Remaining Questions
- Does OND produce clinically meaningful benefits in a larger, controlled patient population with Long COVID or ME/CFS?
- What is the optimal technique, frequency, and duration of OND treatment, and how do these parameters affect outcomes?
- What is the biological mechanism by which epipharyngeal abrasive therapy might reduce Long COVID symptoms, and is it related to lymphatic clearance or immune modulation?
What This Study Does Not Prove
This case report does not establish that OND is an effective treatment for Long COVID, as a single case cannot prove efficacy or determine causation. It does not rule out placebo effects or natural symptom resolution over time. The study provides no evidence that this approach would work for patients beyond this individual case or that improvement would be sustained long-term.
Tags
Symptom:Fatigue
Biomarker:Blood Biomarker
Phenotype:Infection-TriggeredLong COVID Overlap
Method Flag:PEM Not DefinedWeak Case DefinitionNo ControlsSmall SampleExploratory Only
Metadata
- DOI
- 10.3390/v17020210
- PMID
- 40006965
- Review status
- Editor reviewed
- Evidence level
- Early hypothesis, preprint, editorial, or weak support
- Last updated
- 12 April 2026
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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