HeartMate II Post-marketing Clinical Studies to Further Establish and Expand LVAD Therapy
The number of patients with end-stage heart failure (HF) benefiting from mechanical circulatory support based therapy is rapidly growing. Over the last 2 decades the therapy has been rapidly evolving particularly since the introduction of continuous flow ventricular assist devices (CF-LVAD) which addressed several limitations of the first generation pulsatile devices. According to the sixth INTERMACS registry annual report, the 12 and 24 months overall actuarial survival of CF-LVAD was 80% and 70% respectively.1 Survival rates remained unchanged over the past 6 years. The adverse events associated with CF-LVAD have been dramatically reduced when compared to rates associated with the previous generation pulsatile flow devices. The burden of adverse events associated with CF-LVAD decreased over the last 6 years and quality of life improvement at 12 and 24 months remained consistent. According to the report, while the proportion of patients implanted while stable on inotropic support has significantly increased in the last era (2011-2013), the expansion into INTERMACS levels 4 and higher remains limited to 20%.