Key result
Intra-aortic balloon pump support benefits the most when the balloon is deflated simultaneously with ventricular contraction, whereas inflation before diastole interferes with ejection.
Why the study?
How do alterations in IABP timing affect hemodynamic support in a computational model and clinical patients?
How do alterations in IABP timing affect hemodynamic support in a computational model and clinical patients?
A computational model validated in patients demonstrates that IABP timing, specifically deflation simultaneous with ventricular contraction, optimizes hemodynamic support.
Deflation with ventricular contraction may optimize IABP hemodynamics in models; leaves open prospective clinical validation of timing protocols.
Because of the large number of interaction factors involved, the effects of the intra-aortic balloon pump (IABP) have not been investigated deeply. To enhance its clinical efficiency and to better define indications for use, advanced models are required to test the interaction between the IABP and the cardiovascular system. A patient with mild blood pressure depression and a lowered cardiac output is modeled in a lumped parameter computational model, developed with physiologically representative elements for relevant components of circulation and device. IABP support is applied, and the moments of balloon inflation and deflation are varied around their conventional timing modes. For validation purposes, timing is adapted within acceptable ranges in ten patients undergoing IABP therapy for typical clinical indications. In both model and patients, the IABP induces a diastolic blood pressure augmentation as well as a systolic reduction in afterload. The support capabilities of the IABP benefit the most when the balloon is deflated simultaneously with ventricular contraction, whereas inflation before onset of diastole unconditionally interferes with ejection. The physiologic response makes the model an excellent tool for testing the interaction between the IABP and the cardiovascular system, and how alterations of specific IABP parameters (i.e., timing) affect this coupling.
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Schampaert et al. (2012) studied Patients undergoing IABP therapy (n=10). Intra-aortic balloon pump (IABP) timing variations vs. Conventional timing modes was evaluated on Diastolic blood pressure augmentation and systolic reduction in afterload. Intra-aortic balloon pump support benefits the most when the balloon is deflated simultaneously with ventricular contraction, whereas inflation before diastole interferes with ejection.
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