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(a–l) Relation between PETCO2 and CBF in ME/CFS patients with a normal heart rate and blood pressure response and with postural orthostatic tachycardia syndrome. CBF, cerebral blood flow; normHRBP, normal heart rate/blood pressure during tilt test; PETCO2, end‐tidal carbon dioxide; POTS, postural orthostatic tachycardia syndrome during tilt test.
