NPPB and hydrops fetalis: Finally, a retrospective cohort study by Ali et al. followed 127 patients with CF-LVADs for a median follow-up time of 17 months and they found that for each 1000 unit increase in NTproBNP at 3 months post-discharge from CF-LVAD implantation, there was a 17% increased risk of HF hospitalization or death [13].