MEA Summary Review: Cardiac abnormalities in ME/CFS not due to
deconditioning | 26 November 2018
Charlotte Stephens, Research Correspondent, ME Association.
Click to download our 7-page summary review.
Linda van Campen and Frans Visser from the Netherlands have just
published a study
that examined stroke volume and cardiac output in ME/CFS. It confirmed
earlier findings from a smaller study that changes occurred in these
two key cardiac measures despite normal tilt-table results (Timmers et
Both studies found reduced cardiac output and stroke volumes during a
tilt table test in ME/CFS patients compared to healthy controls.
However, these patients had normal tilt table results, meaning their
heart rate and blood pressure did not change significantly enough to
be diagnosed with orthostatic intolerance.
The authors of the earlier study suggested that these findings were
due to deconditioning, but in this new, larger study, Van Campen and
Visser showed they were not as they found no difference in results
between different disease severities.
If it were a case of deconditioning, the cardiac measurements would be
worse in the more severely affected compared to the mild, as they have
poorer physical functioning.
What made this study better than the previous one?
Much larger patient cohort. The previous study tested 26 ME/CFS
patients, whereas this current study involved 150 ME/CFS patients.
Improved method of measuring cardiac parameters. The reliability of
the previous study's method (pulse contour analysis) is questionable,
whereas the current study used a validated technique (suprasternal
aortic Doppler echography) (van Geldorp et al., 2011).
The latest study compared results across illness severities. This
revealed that the cardiac abnormalities could not be due to
What were the two key measures found to be different?
Cardiac output = The volume of blood pumped by the heart per minute.
Stroke Volume = The volume of blood pumped by the left ventricle of
the heart per heartbeat.
Both of these measures usually decrease upon standing. However, they
were found to decrease more in the patients with ME/CFS, compared to
the healthy controls.
This research review is available for free.
Click to read online or to download.
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