Cardiovascular characteristics of chronic fatigue syndrome.
Bozzini, Sara, Albergati, Andrea, Capelli, Enrica et al. · Biomedical reports · 2018 · DOI
Quick Summary
This study looked at heart and blood pressure problems in people with ME/CFS. Researchers found that patients with ME/CFS tend to have lower blood pressure than expected, which may explain some common symptoms like dizziness, fatigue, and difficulty concentrating. Most other heart measurements were similar between people with and without ME/CFS.
Why It Matters
Low blood pressure and orthostatic intolerance are poorly understood but clinically significant features of ME/CFS that contribute substantially to disability. Identifying this cardiovascular pattern helps validate patient symptoms and may guide development of targeted interventions, while also highlighting the importance of blood pressure assessment in clinical ME/CFS evaluation.
Observed Findings
19 of 44 referred patients met diagnostic criteria for CFS
Female-to-male ratio of 4:1 among confirmed cases
Statistically significant association between CFS diagnosis and low blood pressure levels
Majority of standard cardiological parameters were not significantly different between CFS and non-CFS groups
Previous infection with Epstein-Barr virus, cytomegalovirus, and other herpesviruses present in patient history
Inferred Conclusions
Hypotension may be a characteristic cardiovascular feature distinguishing CFS patients from controls
Low blood pressure may mechanistically explain multiple CFS symptoms including fatigue, dizziness, reduced concentration, tremors, and nausea
Orthostatic intolerance and abnormal sympathetic nervous system responses warrant further investigation in CFS pathophysiology
Cardiovascular assessment should be incorporated into routine clinical evaluation of suspected CFS
Remaining Questions
Does low blood pressure precede CFS onset or develop as a consequence of the disease?
What specific mechanisms underlie the association between CFS and hypotension—is it autonomic dysfunction, reduced blood volume, or another cause?
What This Study Does Not Prove
This study does not prove that low blood pressure *causes* ME/CFS or that correcting blood pressure will resolve the disease. As an observational study, it cannot establish causation, only association. The findings also cannot be generalized beyond Caucasian populations or explain all ME/CFS symptoms.