Pump Speed Optimization in Patients Implanted With the HeartMate 3 Device.

Area of Science:

• Cardiovascular Engineering
• Medical Device Optimization
• Hemodynamics

Background:

• Ventricular assist device (VAD) pump speed optimization is crucial for patient management.
• Current methods for VAD optimization present significant challenges during follow-up.
• Invasive hemodynamic assessment combined with exercise testing offers a potential solution.

Purpose of the Study:

• To evaluate the efficacy of combined invasive hemodynamic ramp tests and cardiopulmonary exercise testing (CPX) for optimizing VAD pump speed.
• To determine if this combined approach can improve patient management and exercise capacity.

Main Methods:

• Eighteen patients with HeartMate 3 (HM3) VADs underwent ramp testing with right heart catheterization and echocardiography at various speeds.
• Hemodynamic parameters including central venous pressure (CVP), pulmonary artery pressure, and pulmonary capillary wedge pressure (PCWP) were recorded.
• Functional capacity was assessed using cardiopulmonary exercise testing (CPX) via the modified Bruce protocol.

Main Results:

• Only 30% of patients had normal PCWP at baseline settings.
• Increasing pump speed significantly improved cardiac output and decreased PCWP.
• Hemodynamic ramp testing allowed for successful adjustment of pump speed to achieve near-normal CVP and PCWP in all patients.
• All patients demonstrated good functional capacity on CPX (peak VO2: 16.8 ± 3.5 mL/kg/min).

Conclusions:

• Hemodynamic ramp testing provides an objective method for optimizing VAD pump speed.
• This optimization strategy has the potential to enhance patient exercise tolerance.
• Combined hemodynamic and exercise testing is a valuable tool for VAD management.