Numerous individuals grappling with conditions such as long COVID, POTS, and ME/CFS experience symptoms resulting from diminished blood flow to the brain upon assuming an upright position. Despite being theoretically recognized, substantiating this phenomenon experimentally has proven challenging until recently. Physicians affiliated with Johns Hopkins, Brigham and Women’s, and Harvard Medical School have successfully utilized ultrasound to validate that Cerebral Blood Flow (measured through ultrasound in cerebral arteries as a means of quantifying blood flow to the head) serves as a pivotal biomarker. This objective measure effectively gauges the existence and intensity of various “invisible illnesses.”
