Key result
During IABP assistance in a hybrid computational model, lower E(max) and higher ventricular stiffness resulted in higher total coronary blood flow and cardiac output (~35% and 10%, respectively).
Why the study?
Does IABP assistance improve hemodynamic parameters in a hybrid computational-hydraulic model under varying ventricular and circulatory conditions?
Does IABP assistance improve hemodynamic parameters in a hybrid computational-hydraulic model under varying ventricular and circulatory conditions?
A hybrid computational-hydraulic model demonstrates that IABP performance depends on left ventricular filling, ejection characteristics, and arterial compliance, with greater hemodynamic benefits at lower contractility and higher diastolic stiffness.
Answers are grounded in this paper and cite their sources.
IABP benefits in this model vary with ventricular properties; hypothesis-generating and should not yet change practice.
We investigated the effects of the intra-aortic balloon pump (IABP) on endocardial viability ratio (EVR), cardiac output (CO), end-systolic (V(es)) and end-diastolic (V(ed)) ventricular volumes, total coronary blood flow (TCBF), and ventricular energetics (external work [EW], pressure-volume area [PVA]) under different ventricular (E(max) and diastolic stiffness) and circulatory (arterial compliance) parameters. We derived a hybrid model from a computational model, which is based on merging computational and hydraulic submodels. The lumped parameter computational submodel consists of left and right hearts and systemic, pulmonary, and coronary circulations. The hydraulic submodel includes part of the systemic arterial circulation, essentially a silicone rubber tube representing the aorta, which contains a 40-mL IAB. EVR, CO, V(es), and V(ed), TCBF and ventricular energetics (EW, PVA) were analyzed against the ranges of left ventricular E(max) (0.3-0.5-1 mm Hg/cm(3)) and diastolic stiffness V(stiffness) (≈0.08 and ≈0.3 mm Hg/cm(3), obtained by changing diastolic stiffness constant) and systemic arterial compliance (1.8-2.5 cm(3)/mm Hg). All experiments were performed comparing the selected variables before and during IABP assistance. Increasing E(maxl) from 0.5 to 2 mm Hg/cm(3) resulted in IABP assistance producing lower percentage changes in the selected variables. The changes in ventricular diastolic stiffness strongly influence both absolute value of EVR and its variations during IABP (71 and 65% for lower and higher arterial compliance, respectively). V(ed) and V(es) changes are rather small but higher for lower E(max) and higher V(stiffness). Lower E(max) and higher V(stiffness) resulted in higher TCBF and CO during IABP assistance (∼35 and 10%, respectively). The use of this hybrid model allows for testing real devices in realistic, stable, and repeatable circulatory conditions. Specifically, the presented results show that IABP performance is dependent, at least in part, on left ventricular filling, ejection characteristics, and arterial compliance. It is possible in this way to simulate patient-specific conditions and predict the IABP performance at different values of the circulatory or ventricular parameters. Further work is required to study the conditions for heart recovery modeling, baroreceptor controls, and physiological feedbacks.
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Ferrari et al. (2011) studied this question. Intra-aortic balloon pump (IABP) vs. Before IABP assistance was evaluated on Endocardial viability ratio, cardiac output, ventricular volumes, total coronary blood flow, and ventricular energetics. During IABP assistance in a hybrid computational model, lower E(max) and higher ventricular stiffness resulted in higher total coronary blood flow and cardiac output (~35% and 10%, respectively).
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