How do you re-stratify patients with a primary prevention ICD in need of a generator change if their LVEF has improved to >40% and they have not previously required any device therapies?  

This is an important question on which there remains a lack of consensus. We had tried to address this through an observational study which was published a few years back:(Appropriateness of primary prevention implantable cardioverter-defibrillators at the time of generator replacement: are indicati...