The influence of operational protocol on the fluid dynamics in the 12 cc penn state pulsatile pediatric ventricular assist device: The effect of end-diastolic delay

Benjamin T. Cooper, Breigh N. Roszelle, Tobias C. Long, Steven Deutsch, Keefe B. Manning

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The success of adult ventricular assist devices (VADs), coupled with the high transplant waiting list mortality of infants (40%) has prompted Penn State to develop a pediatric version of the clinically successful adult device. Although the primary use of this device will be bridge-to-transplant, there has been sufficient clinical data to demonstrate the efficacy of VADs in a bridge-to-recovery setting. However, removing the patient from the device, a process known as weaning, demands operation of the device at a lower beat rate and concomitant increased risk for thromboembolism. Previous studies have shown that the interrelated flow characteristics necessary for the prevention of thrombosis in a pulsatile VAD are a strong inlet jet, a late diastolic recirculating flow, and a wall shear rate greater than 500/s. In an effort to develop a strong inlet jet and rotational flow pattern at a lower beat and flow rate, we have compressed diastole by altering the end-diastolic delay time (EDD). Particle image velocimetry was used to compare the flow fields and wall shear rates in the chamber of the 12 cc Penn State pulsatile pediatric VAD operated at 50 beats per minute using EDDs of 10, 50, and 100 ms. Although we expected the 100 ms EDD to have the best wall shear profiles, we found that the 50 ms EDD condition was superior to both the 10 and 100 EDD conditions, due to a longer sustained inlet jet.

Original languageEnglish (US)
JournalArtificial organs
Volume34
Issue number4
DOIs
StatePublished - Apr 1 2010

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Pediatrics
Heart-Assist Devices
Hydrodynamics
Fluid dynamics
Time delay
Equipment and Supplies
Transplants
Shear deformation
Rotational flow
Intake systems
Diastole
Waiting Lists
Shear walls
Rheology
Thromboembolism
Infant Mortality
Weaning
Velocity measurement
Flow patterns
Flow fields

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Medicine (miscellaneous)
  • Biomaterials
  • Biomedical Engineering

Cite this

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The influence of operational protocol on the fluid dynamics in the 12 cc penn state pulsatile pediatric ventricular assist device : The effect of end-diastolic delay. / Cooper, Benjamin T.; Roszelle, Breigh N.; Long, Tobias C.; Deutsch, Steven; Manning, Keefe B.

In: Artificial organs, Vol. 34, No. 4, 01.04.2010.

Research output: Contribution to journalArticle

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