Outcomes after implantable left ventricular assist device replacement procedures.

Area of Science:

• Cardiology
• Cardiovascular Surgery
• Medical Device Engineering

Background:

• Continuous flow left ventricular assist devices (LVADs) are increasingly used for advanced heart failure.
• Device longevity is a concern, necessitating potential LVAD replacement over time.
• Outcomes following LVAD replacement surgery are not well-established compared to primary LVAD implantation.

Purpose of the Study:

• To compare outcomes between patients undergoing replacement LVAD surgery and those receiving primary LVAD implants.
• To identify major indications for LVAD replacement procedures.
• To analyze survival rates and postoperative complications in LVAD replacement patients.

Main Methods:

• Retrospective analysis of 342 LVAD procedures from 2003-2012, with 30 patients undergoing 35 replacement procedures.
• Propensity matching of replacement patients with primary implant patients based on preoperative characteristics.
• Comparison of 30-day and 1-year survival, transfusion needs, organ dysfunction, hospitalization length, infection, and stroke rates.

Main Results:

• Major indications for LVAD replacement were mechanical/electrical failure (57%), hemolysis/thrombosis (29%), and infection (14%).
• Thirty-day survival was 90% and 1-year survival was 48% after LVAD replacement.
• Survival outcomes were significantly worse for LVAD replacement patients compared to matched primary implant patients (p=0.03).
• Postoperative complications such as transfusion, right ventricular dysfunction, renal dysfunction, infection, and stroke were similar between groups.
• Emergent replacement procedures were associated with higher mortality.

Conclusions:

• LVAD replacement is associated with worse survival outcomes compared to primary LVAD implantation.
• While some complications are similar, emergent replacement carries increased mortality risk.
• Strategies like earlier replacement timing, extracorporeal device stabilization, and non-sternotomy approaches warrant further investigation to improve LVAD replacement outcomes.