| Recommendation | Grade of recommendation | Level of evidence |
|---|---|---|
| Inquiry about all medications in use and risk analysis of induced arrhythmias or prolonged QT | I | C |
| 12-derivation EKG in all patients at each clinical visit, even in the absence of symptoms | I | C |
| Calculation of QTc interval for all patients who report palpitation | I | C |
| Calculation of QT interval for all patients with polymorphic VT | I | B |
| 24-h Holter to evaluate symptoms of palpitation, syncope, and unexplained falls | I | B |
| 24-h Holter for asymptomatic patients with normal LV function and EKG with LVH | IIa | B |
| 24-h Holter for asymptomatic patients with depressed LV function and EKG with LVH | I | A |
| 24-h Holter for patients recovered from VF/VT before hospital discharge | IIa | C |
| 24-h Holter for patients recovered from VF/VT during outpatient follow-up to evaluate therapy efficacy | IIb | C |
| 24-h Holter for asymptomatic patients with simple ventricular arrhythmia during the initial exam, with normal LV function and EKG with LVH, during outpatient follow-up to evaluate therapy efficacy | III | C |
| 24-h Holter for asymptomatic patients with complex ventricular arrhythmia during the initial exam, with normal LV function and EKG with LVH, during outpatient follow-up to evaluate therapy efficacy | IIb | C |
| 24-h Holter for asymptomatic patients with simple ventricular arrhythmia during the initial exam, with depressed LV function and EKG with LVH, during outpatient follow-up to evaluate therapy efficacy | III | C |
| 24-h Holter for asymptomatic patients with complex ventricular arrhythmia during the initial exam, with depressed LV function and EKG with LVH, during outpatient follow-up to evaluate therapy efficacy | IIa | C |
| 24-h Holter for asymptomatic patients with normal LV function and EKG | III | B |
| Ergometric test in patients without contraindications who have effort-induced palpitations | I | C |
| Ergometric test in patients without contraindications who have palpitations associated with chest angina | I | C |
| Ergometric test in patients without contraindications who have resting palpitations | III | C |
| Ergometric test in asymptomatic patients without contraindications to investigate arrhythmia | III | C |
| Echocardiogram in all patients with palpitations | IIb | B |
| Echocardiogram in patients with LVH on EKG, asymptomatic patients | IIa | B |
| Echocardiogram in patients with palpitation and dyspnea | I | B |
| Echocardiogram in patients with LVH and cardiac murmur, asymptomatic patients | I | B |
| Investigation of ischemic etiology in all patients with supraventricular tachycardia | III | C |
| Investigation of ischemic etiology in all patients with supraventricular tachycardia and angina | I | C |
| Investigation of ischemic etiology in all patients with complex ventricular tachycardia | I | C |
| Magnetic resonance in patients with complex ventricular arrhythmia, whose other exam results are normal, to investigate arrhythmogenic RV dysplasia, myocardial fibrosis, and asymmetric apical hypertrophy | I | C |
| Magnetic resonance in all patients with VT | III | C |
| Magnetic resonance in all patients with SVT | III | C |
| EPS in patients with high SD risks (unexplained syncope and complex ventricular arrhythmia on Holter or trifascicular block, in order to clarify syncope etiology) | I | C |
EKG: electrocardiogram; EPS: electrophysiological study; LV: left ventricle; LVH: left ventricular hypertrophy; RV: right ventricle; SD: sudden death; SVT: supraventricular tachyarrhythmia; VF: ventricular fibrillation; VT: ventricular tachycardia.