Blood rheology and myalgic encephalomyelitis: a pilot study

Area of Science:

• Hematology
• Rheology
• Immunology

Background:

• Myalgic encephalomyelitis (ME), also known as chronic fatigue syndrome, is a complex multisystem disease.
• Understanding blood rheology alterations in ME is crucial for diagnosing and managing the condition.
• Previous studies have yielded inconsistent findings regarding blood rheology in ME patients.

Purpose of the Study:

• To investigate blood rheology differences between individuals with ME and healthy controls.
• To determine if acute or chronic phases of ME are associated with specific rheological abnormalities.
• To assess the potential impact of these rheological changes on microcirculatory blood flow.

Main Methods:

• Blood samples were collected from ME patients and healthy blood donors using EDTA anticoagulation.
• Blood viscosity was measured using multiple shear rate viscometry.
• Blood filterability was assessed under varying pressures using multiple-pressure filtration techniques.

Main Results:

• While average blood viscosities did not significantly differ between groups, significant differences in whole blood filterability were observed in females with ME at low filtration pressure (2.5 cm H2O).
• These findings suggest that acute-phase ME may involve rheological changes affecting blood flow.
• No significant rheological abnormalities were detected in the chronic state of the disorder.

Conclusions:

• Acute-phase myalgic encephalomyelitis is associated with altered blood rheology, potentially leading to impaired microcirculatory blood flow.
• Chronic-phase ME does not appear to be characterized by significant rheological abnormalities.
• Blood filterability may serve as a sensitive indicator of rheological changes in acute ME, particularly in females.