S1.4-7 If corrective measures are not taken rapidly, this condition progresses to SCD. Cardiac arrest is used to signify an event that can be reversed, usually by cardiopulmonary resuscitation (CPR), administration of medications and/or defibrillation or cardioversion. SCA and SCD can result from causes other than VA, such as bradyarrhythmias, electrome- chanical dissociation, pulmonary embolism, intracranial hemorrhage, and aortic dissection; however, the scope of this document includes only SCA and SCD due to VA. This guideline includes indications for ICDs for the treatment of VA and prevention of SCD, but it does not delve into details on individual device selection and programming, including considerations relevant to car- diac resynchronization therapy (CRT), bradycardia pac- ing, and hemodynamic monitoring. These important aspects of ICD management have been covered in an HRS expert consensus statement.S1.4-8 An AHA science advisory discusses the use of wearable cardioverter- The findings of that document were reviewed; however, recommendations on this topic were developed independently of that document. This guideline includes indications for catheter ablation of VA, but does not provide recommendations on specific techniques or ablation technologies, which were be- yond the scope of this document. Recommendations for interventional therapies, in- cluding ablation and the implantation of devices, apply only if these therapies can be implemented by quali- fied clinicians, such that outcomes consistent with pub- lished literature are a reasonable expectation. The writ- ing committee agreed that a high degree of expertise was particularly important for performance of catheter ablation of VA, and this point is further emphasized in relevant sections. In addition, all recommendations re- lated to ICDs require that meaningful survival of >1 year is expected; meaningful survival means that a patient has a reasonable quality of life and functional status. 