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A viable therapeutic option: mechanical circulatory support of the failing Fontan physiology
- Source :
- Pediatric cardiology. 34(6)
- Publication Year :
- 2012
-
Abstract
- A blood pump specifically designed to augment flow from the great veins through the lungs would ameliorate the poor physiology of the failing univentricular circulation and result in a paradigm shift in the treatment strategy for Fontan patients. This study is the first to examine mechanical cavopulmonary assistance with a blood pump in the inferior vena cava (IVC) and hepatic blood flow. Five numerical models of mechanical cavopulmonary assistance were investigated using a three-dimensional, reconstructed, patient-specific Fontan circulation from magnetic resonance imaging data. Pressure flow characteristics of the axial blood pump, energy augmentation calculations for the cavopulmonary circulation with and without pump support, and hemolysis estimations were determined. In all of the pump-supported scenarios, a pressure increase of 7-9.5 mm Hg was achieved. The fluid power of the cavopulmonary circulation was also positive over the range of flow rates. No retrograde flow from the IVC into the hepatic circulation was evident during support cases. Vessel suction risk, however, was found for greater operating rotational speeds. Fluid shear stresses and hemolysis predictions remained at acceptable levels with normalized index of hemolysis estimations at 0.0001 g/100 L. The findings of this study support the continued design and development of this blood pump technology for Fontan patients with progressive cardiovascular insufficiency. Validation of these flow and performance predictions will be completed in the next round of experimental testing with blood bag evaluation.
- Subjects :
- Heart Defects, Congenital
medicine.medical_specialty
Suction
Heart Ventricles
Fontan Procedure
Inferior vena cava
Internal medicine
medicine
Humans
Computer Simulation
Assisted Circulation
business.industry
Models, Cardiovascular
Blood flow
Equipment Design
Vascular surgery
medicine.disease
Hemolysis
Cardiac surgery
Blood pump
medicine.vein
Pediatrics, Perinatology and Child Health
Circulatory system
cardiovascular system
Cardiology
Cardiology and Cardiovascular Medicine
business
Subjects
Details
- ISSN :
- 14321971
- Volume :
- 34
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- Pediatric cardiology
- Accession number :
- edsair.doi.dedup.....aaa6faf8035619463d3b430916e0a197