Prognostic Value of Cardiopulmonary Exercise Test Parameters in Ventricular Assist Device Therapy

Area of Science:

• Cardiology
• Exercise Physiology

Background:

• Cardiopulmonary exercise test (CPET) parameters are established prognosticators in heart failure.
• The prognostic utility of pre- and postimplantation CPET in left ventricular assist device (LVAD) therapy requires further elucidation.

Purpose of the Study:

• To evaluate the prognostic value of preimplantation and postimplantation CPET parameters in patients undergoing LVAD therapy.
• To assess the association between specific CPET metrics and postimplantation outcomes, including mortality.

Main Methods:

• Retrospective analysis of adult patients who received an LVAD and underwent CPET pre- or postimplantation.
• Calculation and multivariable analysis of five CPET parameters: vO2 max, oxygen uptake efficiency slope (OUES), VE/vCO2 Slope, VE/vCO2 min, and VE/vCO2 max.
• Evaluation of the relationship between CPET parameters and 1, 3, and 5-year postimplantation outcomes.

Main Results:

• Preimplantation vO2 max and OUES predicted 1, 3, and 5-year mortality; VE/vCO2 min predicted 3 and 5-year mortality; VE/vCO2 Slope predicted 5-year mortality.
• Postimplantation vO2 max independently predicted 3 and 5-year mortality; VE/vCO2 max independently predicted 3-year mortality.
• Preimplantation CPET parameters showed prognostic value for long-term survival, with weaker associations for early outcomes.

Conclusions:

• Preimplantation CPET parameters are valuable for predicting long-term survival after LVAD implantation.
• Postimplantation CPET parameters, specifically vO2 max and VE/vCO2 max, are associated with survival on device support and can aid prognostication when preimplantation data is absent.