Peripheral endothelial dysfunction in myalgic encephalomyelitis/chronic fatigue syndrome.

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ESC Heart Fail. 2020 Mar 10. doi: 10.1002/ehf2.12633. [Epub ahead of print]

Peripheral endothelial dysfunction in myalgic encephalomyelitis/chronic fatigue syndrome.
Scherbakov N1,2,3,4, Szklarski M5, Hartwig J5, Sotzny F5, Lorenz S5, Meyer A1,3,4, Grabowski P5, Doehner W1,2,3,4, Scheibenbogen C1,5.

Abstract
AIMS:
Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a complex multisystem disease. Evidence for disturbed vascular regulation comes from various studies showing cerebral hypoperfusion and orthostatic intolerance. The peripheral endothelial dysfunction (ED) has not been sufficiently investigated in patients with ME/CFS. The aim of the present study was to examine peripheral endothelial function in patients with ME/CFS.

METHODS AND RESULTS:

Thirty-five patients [median age 40 (range 18-70) years, mean body mass index 23.8 ± 4.2 kg/m2 , 31% male] with ME/CFS were studied for peripheral endothelial function assessed by peripheral arterial tonometry (EndoPAT2000). Clinical diagnosis of ME/CFS was based on Canadian Criteria. Nine of these patients with elevated antibodies against β2-adrenergic receptor underwent immunoadsorption, and endothelial function was measured at baseline and 3, 6, and 12 months follow-up. ED was defined by reactive hyperaemia index ≤1.81. Twenty healthy subjects of similar age and body mass index were used as a control group. Peripheral ED was found in 18 of 35 patients (51%) with ME/CFS and in 4 healthy subjects (20%, P < 0.05).

Patients with ED, in contrast to patients with normal endothelial function, reported more severe disease according to Bell score (31 ± 12 vs. 40 ± 16, P = 0.04), as well as more severe fatigue-related symptoms (8.62 ± 0.87 vs. 7.75 ± 1.40, P = 0.04) including a higher demand for breaks [9.0 (interquartile range 7.0-10.0) vs. 7.5 (interquartile range 6.0-9.25), P = 0.04]. Peripheral ED showed correlations with more severe immune-associated symptoms (r = -0.41, P = 0.026), such as sore throat (r = -0.38, P = 0.038) and painful lymph nodes (r = -0.37, P = 0.042), as well as more severe disease according to Bell score (r = 0.41, P = 0.008) and symptom score (r = -0.59, P = 0.005).

There were no differences between the patient group with ED and the patient group with normal endothelial function regarding demographic, metabolic, and laboratory parameters. Further, there was no difference in soluble vascular cell adhesion molecule and soluble intercellular adhesion molecule levels. At baseline, peripheral ED was observed in six patients who underwent immunoadsorption. After 12 months, endothelial function had improved in five of these six patients (reactive hyperaemia index 1.58 ± 0.15 vs. 2.02 ± 0.46, P = 0.06).


CONCLUSIONS:
Peripheral ED is frequent in patients with ME/CFS and associated with disease severity and severity of immune symptoms. As ED is a risk factor for cardiovascular disease, it is important to elucidate if peripheral ED is associated with increased cardiovascular morbidity and mortality in ME/CFS.

© 2020 The Authors. ESC Heart Failure published by John Wiley & Sons Ltd on behalf of the European Society of Cardiology.
KEYWORDS:
Cardiovascular risk factor; Chronic fatigue syndrome; Immune score; Peripheral endothelial dysfunction; Reactive hyperaemia index
PMID: 32154656 DOI: 10.1002/ehf2.12633
 

Pyrrhus

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Just to clarify:

There are many different types of endothelial dysfunction in blood vessels, and this study only looked at one specific type of dysfunction in blood vessels.

Specifically, the technique they used (peripheral arterial tonometry) only looks at the ability of arteries (not veins) to dilate in response to nitric oxide (not in response to autonomic nerves).