Table 2.

Proportions of subjects with abnormal orthostatic blood pressure changes according to different criteria in a population of patients (n = 1520) with unexplained syncope and/or orthostatic intolerance

Diagnostic criteria	n (%)	n (difference)
ΔSBP ≤ −20 mmHg and/or ΔDBP ≤ −10 mmHg*	186 (12.2)	Reference
ΔSBP ≤ −20 mmHg only	176 (11.6)	−10
ΔSBP ≤ −20 mmHg and/or 3-min HUT SBP <90 mmHga	188 (12.4)	+2
ΔSBP ≤ −20 mmHg if supine SBP <160 mmHg or ΔSBP ≤ −30 mmHg if supine SBP ≥160 mmHg or 3-min HUT SBP < 90mmHga	173 (11.4)	−13

SBP systolic blood pressure, DBP diastolic blood pressure, HUT head-up tilt test

* Orthostatic hypotension definition according to the current Autonomic Societies Consensus (2011)

^aDefinition of orthostatic hypotension according to the current European Society of Cardiology guidelines for active standing test (2009)