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Simulation of Dilated Heart Failure with Continuous Flow Circulatory Support

Identifieur interne : 001314 ( Main/Exploration ); précédent : 001313; suivant : 001315

Simulation of Dilated Heart Failure with Continuous Flow Circulatory Support

Auteurs : Yajuan Wang [États-Unis] ; Natasha Loghmanpour [États-Unis] ; Stijn Vandenberghe [Suisse] ; Antonio Ferreira [États-Unis, Brésil] ; Bradley Keller [États-Unis] ; John Gorcsan [États-Unis] ; James Antaki [États-Unis]

Source :

RBID : PMC:3894974

Descripteurs français

English descriptors

Abstract

Lumped parameter models have been employed for decades to simulate important hemodynamic couplings between a left ventricular assist device (LVAD) and the native circulation. However, these studies seldom consider the pathological descending limb of the Frank-Starling response of the overloaded ventricle. This study introduces a dilated heart failure model featuring a unimodal end systolic pressure-volume relationship (ESPVR) to address this critical shortcoming. The resulting hemodynamic response to mechanical circulatory support are illustrated through numerical simulations of a rotodynamic, continuous flow ventricular assist device (cfVAD) coupled to systemic and pulmonary circulations with baroreflex control. The model further incorporated septal interaction to capture the influence of left ventricular (LV) unloading on right ventricular function. Four heart failure conditions were simulated (LV and bi-ventricular failure with/without pulmonary hypertension) in addition to normal baseline. Several metrics of LV function, including cardiac output and stroke work, exhibited a unimodal response whereby initial unloading improved function, and further unloading depleted preload reserve thereby reducing ventricular output. The concept of extremal loading was introduced to reflect the loading condition in which the intrinsic LV stroke work is maximized. Simulation of bi-ventricular failure with pulmonary hypertension revealed inadequacy of LV support alone. These simulations motivate the implementation of an extremum tracking feedback controller to potentially optimize ventricular recovery.


Url:
DOI: 10.1371/journal.pone.0085234
PubMed: 24465511
PubMed Central: 3894974


Affiliations:


Links toward previous steps (curation, corpus...)


Le document en format XML

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<term>Cardiomyopathy, Dilated (physiopathology)</term>
<term>Case-Control Studies</term>
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<term>Coronary Circulation (physiology)</term>
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<term>Cardiomyopathie dilatée ()</term>
<term>Cardiomyopathie dilatée (imagerie diagnostique)</term>
<term>Cardiomyopathie dilatée (physiopathologie)</term>
<term>Circulation coronarienne (physiologie)</term>
<term>Dispositifs d'assistance circulatoire</term>
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<term>Défaillance cardiaque (imagerie diagnostique)</term>
<term>Défaillance cardiaque (physiopathologie)</term>
<term>Fonction ventriculaire gauche (physiologie)</term>
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<term>Hypertension, Pulmonary</term>
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<term>Fonction ventriculaire gauche</term>
<term>Pression sanguine</term>
<term>Systole</term>
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<term>Coronary Circulation</term>
<term>Stroke Volume</term>
<term>Systole</term>
<term>Ventricular Function, Left</term>
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<p>Lumped parameter models have been employed for decades to simulate important hemodynamic couplings between a left ventricular assist device (LVAD) and the native circulation. However, these studies seldom consider the pathological descending limb of the Frank-Starling response of the overloaded ventricle. This study introduces a dilated heart failure model featuring a unimodal end systolic pressure-volume relationship (ESPVR) to address this critical shortcoming. The resulting hemodynamic response to mechanical circulatory support are illustrated through numerical simulations of a rotodynamic, continuous flow ventricular assist device (cfVAD) coupled to systemic and pulmonary circulations with baroreflex control. The model further incorporated septal interaction to capture the influence of left ventricular (LV) unloading on right ventricular function. Four heart failure conditions were simulated (LV and bi-ventricular failure with/without pulmonary hypertension) in addition to normal baseline. Several metrics of LV function, including cardiac output and stroke work, exhibited a unimodal response whereby initial unloading improved function, and further unloading depleted preload reserve thereby reducing ventricular output. The concept of
<italic>extremal loading</italic>
was introduced to reflect the loading condition in which the intrinsic LV stroke work is maximized. Simulation of bi-ventricular failure with pulmonary hypertension revealed inadequacy of LV support alone. These simulations motivate the implementation of an extremum tracking feedback controller to potentially optimize ventricular recovery.</p>
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