EF cut-off at 35%
While all patients had an EF ≤35% at baseline, 381 (32%) had an improvement to >35% at first follow-up (Figure 1). However, at second follow-up EF had returned back to ≤35% in 104 (27%) of these patients. On the other hand, of the 797 patients who had an EF <35% at first follow-up, 146 (18%) had an improvement to >35% at the second follow-up. A fluctuation was observed in both the ischemic and non-ischemic cardiomyopathy subgroups (Appendix), but a higher proportion of patients with non-ischemic cardiomyopathy had an improvement in EF to >35% at first follow-up compared to those with ischemic cardiomyopathy (38% vs. 27%, p=<0.0001).