CONCLUSION
Substantial fluctuations of EF occur among patients with ischemic or
non-ischemic cardiomyopathy who are eligible for ICD implantation. These
data suggest that EF improvement in these patients represents remission
rather than true recovery of the cardiomyopathy and may help explain the
continued risk of SCD after improvement in EF. These data support the
need for indefinite medical and continued device therapy after
improvement in EF.