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Flow chart of the study population. The diagram summarises the diagnostic workup and follow-up of patients presenting with unexplained syncope or symptoms of orthostatic intolerance. AF, atrial fibrillation; AVB, intraventricular/atrioventricular block; CSS, carotid sinus syndrome; ICD, implantable cardioverter defibrillator; OH, orthostatic hypotension; PM, pacemaker; SA, sinus arrest; VT/VF, ventricular tachycardia/ventricular fibrillation; VVS, vasovagal syncope.
