PASC Phenotyping Microvascular Hypoxia NIH RECOVER Framework

Long COVID vs. ME/CFS: Clinical Phenotyping, Microclots & Spike Persistence

Long COVID (PASC) is not a single monolith. This monograph breaks down the 4 biological sub-phenotypes (ME/CFS-like, Autonomic/POTS, Endothelial Microclotting, and Mast Cell Activation), detailing viral antigen reservoirs and targeted diagnostic workups.

1. The 4 Clinical Phenotypes of Long COVID

Phenotype Dominant Pathophysiology Primary Symptoms Target Treatments
1. ME/CFS Phenotype Mitochondrial failure, craniocervical neuro-inflammation, impaired glycolysis. Post-Exertional Malaise (PEM), unrefreshing sleep, severe mental/physical crashes. Pacing, Low-Dose Naltrexone (LDN), Low-Dose Abilify (LDA), CoQ10 + NADH.
2. Dysautonomia / POTS Small-fiber neuropathy, splanchnic venous pooling, autoantibodies against GPCRs. Tachycardia upon standing (ΔHR ≥ 30 bpm), lightheadedness, blood pooling in feet. Pyridostigmine (Mestinon), Ivabradine, Fludrocortisone, 30–40 mmHg binders.
3. Endothelial Microclots Fibrin amyloid microclots, platelet hyperactivation, capillary hypoxia. Severe shortness of breath with normal chest CT, muscle burning at rest, chest heaviness. Fibrinolytic enzymes (Nattokinase, Lumbrokinase), Sulodexide, Triple Anticoagulation.
4. MCAS / Allergic Mast cell degranulation, histamine, tryptase, and prostaglandin release. Flushing, dermatographia, gastrointestinal spasms, food sensitivities, hives. H1/H2 blockers (Famotidine, Cetirizine), Cromolyn sodium, Quercetin, Low-Histamine diet.

Peer-Reviewed References

  1. Davis HE, et al. Long COVID: major findings, mechanisms and recommendations. Nat Rev Microbiol. 2023;21(3):133-146. PMID: 36639608.
  2. Proal AD, VanElzakker MB. Long COVID or Post-acute Sequelae of COVID-19 (PASC): An Overview of Biological Factors That May Drive Persistent Symptoms. Front Microbiol. 2021;12:698169. PMID: 34248921.
  3. Pretorius E, et al. Persistent clotting protein pathology in Long COVID. Cardiovasc Diabetol. 2021;20(1):172. PMID: 34425843.