Outflow cannula position for left ventricular assist device: A propensity score-matched study.

Area of Science:

• Cardiology
• Medical Devices
• Surgical Techniques

Background:

• Left ventricular assist device (LVAD) implantation is a critical treatment for end-stage heart failure.
• The positioning of the outflow cannula can influence clinical outcomes, but data comparing different approaches are limited.

Purpose of the Study:

• To evaluate the clinical consequences of alternative outflow cannula positioning in LVAD implantation.
• To compare outcomes between right-sided versus left-sided outflow cannula implantation into the ascending aorta.

Main Methods:

• A cohort of 50 consecutive patients undergoing LVAD implantation with the Medtronic Heartware Ventricular Assist Device was analyzed.
• Patients were divided into left and right outflow cannula positioning groups.
• Propensity score matching was used to control for baseline differences in Interagency Registry for Mechanically Assisted Circulatory Support score, prior cardiac surgery, and inotropic support.

Main Results:

• In the matched cohort (n=45), no significant differences were observed in baseline demographics.
• Pump thrombosis rates were 10% (right) vs. 8% (left), and stroke rates were 10% (right) vs. 16% (left).
• One-year mortality showed no significant difference between right-sided (20%) and left-sided (25%) implantation.

Conclusions:

• There were no significant differences in mortality, stroke, or pump thrombosis between left and right outflow cannula positioning for LVAD implantation.
• While preliminary, these findings suggest left-sided anastomoses may facilitate subsequent heart transplantation re-entry.
• Larger studies are needed to confirm these outcomes.