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Related Experiment Video

Updated: Mar 16, 2026

Implantation of Left Ventricular Assist Device (LVAD) in Juvenile Landrace Swine: A LVAD Implantation Model of Pediatric Heart Failure
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High-frequency operation of a pulsatile VAD - a simulation study.

Mathias Rebholz1, Raffael Amacher2, Anastasios Petrou1

  • 1pd|z Product Development Group Zurich, Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich.

Biomedizinische Technik. Biomedical Engineering
|August 10, 2016
PubMed
Summary

Increasing pulsatile ventricular assist device (pVAD) stroke frequency can reduce its size. Simulations show reduced stroke volume maintains support, allowing smaller pVADs for heart failure patients.

Keywords:
hemodynamics with mechanical circulatory supportpulsatile blood pumpspulsatilitysynchronous operation, ventricular assist device (VAD)

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Physiology
  • Medical Devices

Background:

  • Ventricular assist devices (VADs) treat severe heart failure.
  • Pulsatile VADs (pVADs) are often too large for full implantation.
  • Turbodynamic VADs (tVADs) have largely replaced pVADs due to size constraints.

Purpose of the Study:

  • To investigate if increasing pVAD stroke frequency can reduce device size.
  • To evaluate the hemodynamic effects of synchronized pVAD operation at varying rates.
  • To determine if smaller pVADs can maintain adequate cardiovascular support.

Main Methods:

  • Simulated a human cardiovascular system (CVS) with a pVAD.
  • Tested pVADs at stroke rates equal to, twice, and thrice the heart rate (HR).
  • Synchronized pVAD operation with HR for hemodynamic control and ventricular unloading.

Main Results:

  • Reduced pVAD stroke volume by 71% while maintaining 30 mm Hg aortic pulse pressure.
  • Achieved pVAD synchronization, avoided suction events, and enabled aortic valve opening.
  • Demonstrated that a 67% stroke volume reduction allows tuning of pVAD-CVS interaction.

Conclusions:

  • Increasing pVAD stroke frequency significantly reduces required stroke volume.
  • Smaller pVADs are feasible without compromising hemodynamic support or ventricular unloading.
  • Physician-tunable pVADs can be developed for personalized heart failure treatment.