eTable. Definition of test results considered as pathological for the decision to hospitalize patients with syncope.

Test
Long-term ECG	narrow complex tachycardia (e.g., AV nodal reentrant tachycardia or absolute tachyarrhythmia) newly diagnosed atrial fibrillation (also normal frequency) absolute bradycardia with symptoms sinus arrest with pauses over 3 seconds AV block type II (Mobitz) or higher-grade block of conduction ventricular tachycardia (at least 5 beats)
Echocardiography	left ventricular ejection fraction <40% local wall movement abnormalities (hypokinesis/akinesis) in more than 2 segments, or ‧evidence for a cardiac wall aneurysm hemodynamically relevant obstruction in the left ventricular outflow tract medium and severe valve defects evidence of at least moderate pulmonary hypertension
Coronary angiography	significant coronary artery stenosis >70% at least moderate valve defects left ventricular ejection fraction <40 % local wall motion abnormalities cardiac wall aneurysm
Carotid artery ultrasonography	>70% stenosis of the carotid artery flow asymmetry in the vertebral arteries flow reversal of vertebral artery
Orthostatin test	drop in systolic blood pressure by >20 mmHg drop in diastolic blood pressure by >10 mmHg symptomatic orthostatin test
Chest X-ray	pathological changes of the lung parenchyma enlarged heart shadow signs of congestion
Cranial computed tomography (CCT)	recent ischemic stroke intracranial hemorrhage aneurysm of the cerebral vessels brain cancer other intracranial pathological changes skull fracture