Conduction defects with pro- gression to complete heart block and VT or VF are common. Amiodarone appears to be effec- tive in treating VA.S7.5-23 An ICD is frequently used in the late phase of myocarditis,S7.5-24 and radiofrequency catheter ablation has been suc- cessfully used to control recurrent VA in some 2. Giant cell myocarditis is fairly uncommon, but it is of particular importance as it typically affects young individuals and is usually fatal if untreated. The diagnosis is confirmed by endo- myocardial biopsy. Patients may develop heart block, requiring a temporary or a permanent pacemakers. An ICD and antiarrhythmic medica- tions, such as amiodarone are often used in the acute phase to treat VT or VF and reduce the risk 7.6. Cardiac Sarcoidosis Recommendations for Cardiac Sarcoidosis References that support the recommendations are summarized in Online Data Supplement 33. 