Fig. 5

LVEF improvement according to quartile of severity. Pre-procedural LVEF (red), compared with 1st set of post-procedure LVEF measurements (blue) at 4 months ± 1.9 months (range 1–9 mo) and final follow-up (yellow). The LVEFs were measured by MUGA, echocardiogram, or SPECT; the values were treated as continuous variables and compared by paired t-test which demonstrated a significant improvement from pre-procedure to final follow-up (p < 0.0002). Overall, the improvement in LVEF from pre-procedure to post-procedure was statistically significant (Fisher’s exact test p < 0.004). The improvement was most marked in the patients with the most severe cardiomyopathy (LVEF < 20%)