Therefore many patients without tachycardia remain undiagnosed by the tilt test if the end tidal CO2 and CBFv are not measured. Novak – author Orthostatic intolerance just got a bit more complex.  That was actually good news. Hopefully chronic fatigue syndrome (ME/CFS) will soon get more complex in the same … Continue reading Hypocapnic Cerebral Hypoperfusion: New Kind of Orthostatic Intolerance Points to Key Factor in ME/CFS and Others