Observational Study on Immunoadsorption (IA) in Patients With Autoantibody-Positive Post-Infectious ME/CFS

Patients presenting to our outpatient clinic who meet the Canadian Consensus Criteria (CCC) for ME/CFS and show detectable autoantibodies are offered IA as part of routine care. Those undergoing IA are invited to participate in this observational study. Post-COVID patients fulfilling the CCC are also eligible for IA and study inclusion.

IA is performed independently of the study at the Diamedikum Potsdam. The standard clinical schedule includes five outpatient sessions on days 1, 2, 4, 6, and 8. This procedure follows routine clinical practice and is not influenced by study participation.

At study inclusion, all patients undergo baseline assessments including routine laboratory tests, immunoglobulins, autoantibodies, and biomarkers, with a total of 50 ml of blood collected. Additional diagnostic workup is performed as clinically indicated. The diagnosis of ME/CFS is confirmed using the CCC.

Health status and symptom severity are documented using validated questionnaires: SF-36 (Physical Function subscale), work ability (past 12 months), weighted CCC symptom score, Chalder Fatigue Questionnaire, and Bell Disability Scale. These are completed monthly for 12 months after treatment. To reduce participant burden, questionnaires are mailed to patients for home completion.

Further clinical and laboratory assessments are conducted before IA and at 2- and 6-months post-treatment: i) Handgrip strength, ii) NASA Lean Test, and iii) Blood sampling.

The total study duration per participant is 12 months after IA.

This is a non-interventional observational study following patients with ME/CFS or PCS undergoing IA using the TheraSorb® Immunoadsorption system (Miltenyi) within its approved indication.

Evidence on the effectiveness of IA for ME/CFS including PCS exists only from clinical studies. This observational study aims to provide data to support a future randomized controlled trial (RCT).

Inclusion criteria

• Patients aged 18-65 years who are able to give informed consent and have: i) ME/CFS diagnosed according to the CCC, with exertion intolerance and symptom worsening (post exertional malaise = PEM) lasting at least 14 hours and ii) Significant functional impairment with a Bell Disability Score < 60
• Presence of autoantibodies (adrenergic or antineuronal antibodies)
• Undergoing IA with the TheraSorb® column over 5 days
• Written informed consent provided by the patient
• Health insurance coverage

Exclusion criteria

• Lack of willingness to store pseudonymized disease data as part of the study
• Pregnancy
• Presence of other conditions that prevent a definite ME/CFS diagnosis (e.g., heart failure, lung disease, severe depression, cancer)
• Acute infection (COVID, HIV, hepatitis)
• Severe fatigue disease with bedriddenness (Bell Disability Score < 30)