6/ 10Borderline
Cerebral blood flow is reduced in ME/CFS during head-up tilt testing even in the absence of hypotension or tachycardia: A quantitative, controlled study using Doppler echography
van Campen CLMC, Verheugt FWA, Rowe PC, et al. · Clinical Neurophysiology Practice · 2020
Brain blood flow fell much more on tilt in patients than in healthy controls, even with normal heart rate and blood pressure, but without inactive or ill controls or a correction for over-breathing, the claims about cause and diagnosis go beyond the data.
Healthy controls only, fitness not reportedScans recorded by a clinician who knew the groupsMeasures blood volume to the brain, not just speed