Resting heart rate according to diagnosis Resting heart rate according to diagnosis. Resting heart rate stratified according to final diagnosis at head-up tilt test. NoDx, no diagnosis; VVS, vasovagal syncope; POTS, postural tachycardia syndrome; OH, orthostatic hypotension. Resting heart rate according to diagnosis. Resting heart rate stratified according to final diagnosis at head-up tilt test. NoDx, no diagnosis; VVS, vasovagal syncope; POTS, postural tachycardia syndrome; OH, orthostatic hypotension. Viktor Hamrefors et al. Open Heart 2017;4:e000585 ©2017 by British Cardiovascular Society