Impella - Current issues and future expectations for the percutaneous, microaxial flow left ventricular assist device

Area of Science:

• Cardiology
• Medical Devices
• Mechanical Circulatory Support

Background:

• Temporary mechanical circulatory support is crucial for acute heart failure with cardiogenic shock.
• Impella, a catheter-based axial flow left ventricular assist device (LVAD), is gaining attention for its role in hemodynamic support.
• Its unique design and function offer benefits similar to traditional LVADs.

Purpose of the Study:

• To review the principles, physiology, indications, and complications of Impella support.
• To discuss current evidence and future expectations for Impella devices.
• To highlight the need for robust randomized controlled trials (RCTs).

Main Methods:

• This review synthesizes existing literature, including case reports and retrospective studies.
• It examines the physiological effects of Impella on hemodynamics and organ perfusion.
• The review discusses clinical indications and potential complications.

Main Results:

• Impella enhances mean arterial pressure and systemic blood flow, improving organ perfusion and aiding recovery.
• It unloads the left ventricle, increasing coronary perfusion and reducing myocardial oxygen demand, promoting cardiac recovery.
• Impella serves as a mechanical vent for the left ventricle in extracorporeal membrane oxygenation (ECMO) settings.

Conclusions:

• Impella is indicated for cardiogenic shock, high-risk interventions, and as a bridge to recovery, durable devices, or transplantation.
• Prophylactic use in high-risk cardiac surgery is emerging.
• While promising, evidence from large RCTs is limited but ongoing, crucial for defining optimal Impella utilization.