n with neuromuscular diseases with any degree of AV block, with or without symptoms.
New recommendations for the implantation of cardioverter-defibrillator devices cover patients with:
-spontaneous sustained ventricular fibrillation that is not amenable to other treatments, but only in the absence of structural heart disease
-left ventricular ejection fraction of 30 percent or less,
at least one month post-myocardial infarction and three months post-coronary artery revascularization surgery
-syncope of unexplained etiology or family history of sudden unexplained cardiac death, in association with typical or atypical right bundlebranch block and ST-segment elevation
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