For the critical outcome of survival to hospital discharge, we identified no evidence that a specific prearrest management strategy in patients with dilated cardiomyopathy or myocarditis shows a benefit. For the critical outcome of survival to hospital discharge, we identified no evidence that a specific anesthetic technique in patients with dilated cardiomyopathy shows any benefit. For the critical outcome of survival to hospital discharge, we identified very-low-quality evidence from a pediatric observational study (downgraded for risk of bias and imprecision)(Teele 2011, 638-643) of 20 children with acute fulminant myocarditis, which demonstrated that the pre–cardiac arrest use of extracorporeal membrane oxygenation (ECMO) may be beneficial.