Guidance for symptomatic patients in clinical practice. CA, catheter ablation; ECG, electrocardiogram; ELR, external loop recorder; EPS, electrophysiology study; ICM, implantable cardiac monitor; PER, post-event recorder; SHD, structural heart disease. * If syncope during or shortly after exertion, left ventricular hypertrophy suggesting cardiomyopathy, ECG changes consistent with acute ischaemia, pre-excited QRS complexes; ** If syncope and bundle branch block in resting ECG, pre-excited QRS complexes, paroxysmal supraventricular tachycardia; *** Provocative test with ajmaline/flecainide when Brugada syndrome is suspected, cardiac magnetic resonance when arrhythmogenic ventricular cardiomyopathy is suspected.