Clinical Scenarios in Which Cardiac PET May Be Useful in Suspected or Known CS
| Scenario | Specifics |
| Patients with histologic evidence of extraCS, and abnormal screening for CS, defined as one or more of following: | Abnormal electrocardiographic findings of complete left or right bundle branch block or presence of unexplained pathologic Q waves in two or more leads |
| Echocardiographic findings of regional wall motion abnormality, wall aneurysm, basal septum thinning, or LVEF ≤ 50% | |
| Holter findings of sustained or nonsustained ventricular tachycardia | |
| Cardiac MRI findings suggestive of CS | |
| Unexplained palpitations or syncope | |
| Young patients (<60 y) with unexplained, new onset, significant conduction system disease (such as sustained second- or third-degree atrioventricular block) | |
| Patients with idiopathic sustained ventricular tachycardia, defined as not fulfilling any of the following criteria: | Typical outflow tract ventricular tachycardia |
| Fascicular ventricular tachycardia | |
| Ventricular tachycardia secondary to other structural heart disease (coronary artery disease or any cardiomyopathy other than idiopathic) | |
| Patients with proven CS as adjunct to follow response to treatment |