Fig. 1

Diagnostic criteria for orthostatic intolerance in this study. a: based on reference 5. b: based on references 15. BP, blood pressure; INOH, instantaneous orthostatic hypotension; SBP, systolic blood pressure; delayed OH, delayed orthostatic hypotension; HR, heart rate; POTS, postural orthostatic tachycardia syndrome; OI, orthostatic intolerance