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Autonomic function in patients with chronic fatigue syndrome
P M Soetekouw1, J W Lenders, G Bleijenberg
1Department of Medicine, St. Radboud University Hospital, Nijmegen, The Netherlands.
Summary
This study found no major changes in cardiovascular autonomic function in patients with chronic fatigue syndrome (CFS). While some stress responses differed, overall autonomic control appears largely intact in CFS patients.
Area of Science:
- Cardiovascular Physiology
- Autonomic Nervous System Function
- Chronic Fatigue Syndrome Research
Background:
- Chronic fatigue syndrome (CFS) is sometimes associated with subtle autonomic dysfunction and orthostatic intolerance.
- Assessing cardiovascular autonomic function is crucial for understanding CFS pathophysiology.
Purpose of the Study:
- To noninvasively evaluate cardiovascular autonomic function in an unselected group of patients with CFS.
- To compare the responsiveness of CFS patients to various cardiovascular reflex tests against healthy controls.
Main Methods:
- Utilized Finapres device for continuous blood pressure and heart rate (HR) monitoring in 37 CFS patients and 38 controls.
- Administered cardiovascular reflex tests including forced breathing, standing, Valsalva maneuver, and sustained handgrip exercise.
- Included mental arithmetic tests and symptom severity questionnaires.
Main Results:
- No significant resting differences in blood pressure or HR between CFS patients and controls.
- CFS patients showed significantly lower HR response to mental arithmetic stress, suggesting impaired sympathetic responsiveness.
- Hemodynamic responses during handgrip exercise were lower in CFS patients, potentially due to reduced exertion.
Conclusions:
- The study suggests no gross alterations in cardiovascular autonomic function in patients with chronic fatigue syndrome.
- While some specific stress responses may be blunted, overall autonomic control appears largely preserved in CFS.