Related Experiment Video
Updated: Aug 4, 2026
Measuring Ascending Aortic Stiffness In Vivo in Mice Using Ultrasound
Published on: December 2, 2014
In vitro evaluation of the effect of aortic compliance on pediatric intra-aortic balloon pumping
L L Minich1, L Y Tani, J A Hawkins
1Departments of Pediatrics and Surgery, University of Utah, Salt Lake City, UT
Insights
Intra-aortic balloon pumping (IABP) improves blood flow and reduces afterload in pediatric circulation models. This study shows IABP benefits even in aortas with higher compliance, crucial for pediatric heart support.
Area of Science:
- Cardiovascular fluid dynamics
- Pediatric cardiology
- Biomedical engineering
Background:
- Pediatric intra-aortic balloon pumping (IABP) is a critical mechanical circulatory support.
- Understanding the impact of aortic compliance on IABP effectiveness is essential for optimizing pediatric cardiac care.
Purpose of the Study:
- To evaluate the effect of aortic compliance on the efficacy of pediatric intra-aortic balloon pumping (IABP).
Main Methods:
- An in vitro mechanical model simulating pediatric left heart circulation was utilized.
- Two aortas with differing compliances (0.12 and 0.07 mL/mm Hg) were tested under baseline, shock, and IABP conditions.
- Flow rates and pressures were measured in the ascending aorta, coronary, and brachiocephalic arteries.
Main Results:
- IABP consistently provided diastolic augmentation and afterload reduction in both compliant and less-compliant aortas.
- IABP significantly increased coronary and brachiocephalic arterial flow and aortic pressure compared to shock conditions.
- Aortic flow augmentation was more pronounced in the less-compliant aorta.
Conclusions:
- Pediatric IABP effectively improves hemodynamics, including diastolic augmentation and afterload reduction, across varying aortic compliances.
- The findings support the use of IABP in pediatric patients with different aortic characteristics.
- IABP demonstrates significant benefits in enhancing systemic and coronary perfusion in simulated pediatric circulatory states.
Abstract:
OBJECTIVES: To evaluate the effect of aortic compliance on pediatric intra-aortic balloon pumping (IABP). DESIGN: In vitro study using a mechanical model of the pediatric left heart circulation. SETTING: Cardiovascular fluid dynamics research laboratory. SUBJECT: Pulsatile flow system simulating the pediatric left heart circulation and two different aortas with compliances comparable to those of the pediatric aorta (0.12 and 0.07 mL/mm Hg). INTERVENTIONS: Measurements were made at a baseline peak aortic flow of 4 L/min, at simulated shock (1.7 L/min), and with 1:1 IABP (rates, 130 and 150 bpm; balloon volumes, 2.5 and 5.0 mL). MEASUREMENTS AND MAIN RESULTS: Peak flow rates were measured in the ascending aorta, coronary arterial system, and brachiocephalic arterial systems. Aortic pressure was measured in the ascending aorta. For both aortas (0.12 and 0.07 mL/mm Hg), IABP resulted in diastolic augmentation (38 +/- 8 and 43 +/- 16 mm Hg) and afterload reduction (4 +/- 2 and 6 +/- 3 mm Hg). For both aortas, compared to shock, IABP resulted in significant increases in coronary arterial and brachiocephalic arterial flow and aortic pressure for both aortas. Aortic flow significantly increased only in the less-compliant aorta. CONCLUSIONS: In a laboratory model of pediatric left heart circulation, IABP results in diastolic augmentation, afterload reduction, and improved hemodynamics, even in aortas of greater compliance.
