Elevated nocturnal blood pressure and heart rate in adolescent chronic fatigue syndrome.
Hurum, Harald, Sulheim, Dag, Thaulow, Erik et al. · Acta paediatrica (Oslo, Norway : 1992) · 2011 · DOI
Quick Summary
Researchers measured heart rate and blood pressure over 24 hours in 44 adolescents with ME/CFS and 52 healthy teenagers. They observed that during sleep, adolescents with ME/CFS had higher heart rates and blood pressure compared to healthy peers, and during the day their heart rates also remained elevated. These preliminary findings suggest the nervous system may regulate heart and blood vessel function differently in ME/CFS, though the clinical importance of these observations remains unclear.
Why It Matters
Cardiovascular regulation patterns may be relevant to understanding ME/CFS pathophysiology. If confirmed in larger studies, nocturnal blood pressure and heart rate elevation could become part of a physiological profile that helps distinguish ME/CFS from other adolescent conditions, and might suggest targets for monitoring or intervention.
Observed Findings
Nocturnal heart rate was significantly higher in adolescents with ME/CFS compared to controls (p < 0.01).
Nocturnal mean arterial blood pressure was significantly higher in the ME/CFS group compared to controls (p < 0.01).
Nocturnal diastolic blood pressure was significantly higher in the ME/CFS group compared to controls (p < 0.01).
Daytime heart rate was significantly higher in adolescents with ME/CFS compared to controls (p < 0.05).
Daytime blood pressures (systolic and diastolic) showed no significant difference between the two groups.
Inferred Conclusions
The authors propose that the elevation in nocturnal and daytime heart rate, combined with elevated nocturnal blood pressure, is consistent with sympathetic predominance in cardiovascular autonomic control among adolescents with ME/CFS.
The authors suggest that cardiovascular assessment may warrant increased clinical attention in adolescent ME/CFS populations.
The authors identify elevated nocturnal cardiovascular parameters as a potential target for future therapeutic investigation, although no evidence is presented that modification of these parameters would improve ME/CFS outcomes.
Remaining Questions
Does elevated nocturnal blood pressure and heart rate persist across different age groups and disease severity levels in ME/CFS?
What This Study Does Not Prove
This cross-sectional design does not establish whether elevated nocturnal blood pressure and heart rate cause ME/CFS symptoms, result from ME/CFS, or contribute to post-exertional malaise. The study does not establish whether sympathetic predominance is a mechanism of ME/CFS or merely an association. These findings do not support any treatment recommendation and do not clarify whether the observed cardiovascular pattern is specific to ME/CFS or shared with other conditions.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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Are these cardiovascular patterns specific to ME/CFS, or are they observed in other adolescent conditions associated with autonomic symptoms?
Do these nocturnal and daytime cardiovascular patterns correlate with symptom burden, post-exertional malaise, or exercise intolerance?
Can interventions that modulate sympathetic nervous system activity reduce these cardiovascular abnormalities and, if so, do they improve clinical outcomes?