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Published on: November 26, 2018
Feasibility of the PSCOPE hybrid model for predicting post-left ventricular assist device hemodynamics: Three
Abraham E Umo1, Brett A Welch2, Arman Kilic2
1Bioengineering, Clemson University, Clemson, SC, USA.
Objective:
The Physiology Simulation Coupled Experiment (PSCOPE) is a hybrid modeling framework designed for mechanistic cardiovascular predictive modeling. It couples a physical fluid experiment with a lumped parameter network simulation to replicate the closed-loop feedback between simulated cardiovascular physiology and fluid dynamics in the physical experiment. This study evaluates the feasibility of using PSCOPE to predict post-surgical physiology via preliminary validation against clinical data in the context of HeartMate 3 left ventricular assist device implantation.
Methods:
We designed a protocol to characterize the pre- and post-surgical hemodynamics of three adult HeartMate 3 patients using perioperative clinical measurements acquired from routine intensive care unit monitoring. For each patient, we tuned a lumped parameter network model to match their pre-surgical hemodynamic values, creating a patient-specific simulation of pre-surgical physiology. The PSCOPE framework then modeled LVAD implantation by coupling these simulations to a physical HeartMate 3 device flow experiment. This hybrid model estimates physiological flow rate and pressure parameters to predict the patients' post-surgical hemodynamics.
Results:
The percentage difference between PSCOPE predictions and clinical post-surgical hemodynamics ranged from 0.0% to 66.8% across different hemodynamic parameters in different patients. The predicted cardiac index, mean pulmonary arterial pressure, central venous pressure, and pulmonary arterial wedge pressure together accurately indicated the absence of post-implant right ventricular failure in all patients.
Conclusion:
This feasibility study suggests that PSCOPE's patient-specific predictions may help anticipate post-implant hemodynamic trends-including right-ventricular failure risk-and inform surgical planning; however, a more rigorous validation remains necessary to demonstrate broader applicability across LVAD-patient populations.
