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Related Experiment Video

Updated: Nov 28, 2025

Normothermic Ex Situ Heart Perfusion in Working Mode: Assessment of Cardiac Function and Metabolism
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Left atrial assist device function at various heart rates using a mock circulation loop.

Yuichiro Kado1, Anthony R Polakowski1, Barry D Kuban1

  • 1Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA.

The International Journal of Artificial Organs
|December 1, 2020
PubMed
Summary
This summary is machine-generated.

A new left atrial assist device (LAAD) effectively supports circulation in simulated heart failure with preserved ejection fraction (HFpEF) and diastolic dysfunction. The device maintained adequate cardiac output and aortic pressure across various heart rates and failure conditions.

Keywords:
Assisted circulationdiastolic heart failureheart failure with preserved ejection fractionhemodynamicsmechanical circulatory support

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Area of Science:

  • Cardiovascular Engineering
  • Biomedical Devices
  • Heart Failure Research

Background:

  • Heart failure with preserved ejection fraction (HFpEF) and diastolic dysfunction (DHF) represent significant unmet clinical needs.
  • Current therapeutic options for DHF are limited, necessitating novel device development.
  • Left atrial assist devices (LAADs) offer a potential solution for improving cardiac function in these patients.

Purpose of the Study:

  • To evaluate the hemodynamic performance of a novel left atrial assist device (LAAD).
  • To assess the efficacy of the LAAD under normal heart conditions and simulated diastolic heart failure (DHF).
  • To determine the impact of the LAAD on cardiac output, aortic pressure, and left atrial pressure across various heart rates.

Main Methods:

  • A pulsatile mock circulatory loop was utilized, incorporating a pneumatic ventricle to simulate native left ventricular function.
  • Simulations included normal heart (NH) and mild, moderate, and severe diastolic heart failure (DHF) conditions by adjusting ventricular diastolic pressures.
  • A continuous-flow LAAD was tested at 3200 rpm across pneumatic ventricle rates of 60, 80, and 120 bpm, measuring key hemodynamic parameters.

Main Results:

  • The LAAD significantly increased cardiac output (3.4-3.8 L/min) and mean aortic pressure (90-105 mmHg) under all tested conditions.
  • Hemodynamic improvements were observed across all DHF severities and heart rates, independent of the pneumatic ventricle's rate.
  • Mean left atrial pressure decreased with LAAD support in DHF conditions, indicating improved atrial unloading.

Conclusions:

  • The developed LAAD demonstrates robust hemodynamic support capabilities in an in vitro model.
  • The device effectively maintains adequate circulation across a range of heart rates and simulated diastolic heart failure conditions.
  • LAAD technology holds promise for managing patients with HFpEF and DHF.