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Author

  • Benson, D. Woodrow (1)
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  • 2012
  • dynam
  • procedur

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Article

Hypoplastic Left Heart Syndrome Current Considerations and Expectations

by Jeffrey A. Feinstein; D. Woodrow Benson; Anne M. Dubin; Meryl S. Cohen; Dawn M. Maxey; William Mahle; Elfriede Pahl; Juan Villafane; Ami B. Bhatt; Lynn F. Peng; Beth Ann Johnson; Alison L. Marsden; Curt J. Daniels; Nanacy A. Rudd; Christopher A. Caldarone; Kathleen A. Mussatto; David L. Morales; D. Dunbar Ivy; J. William Gaynor; James S. Tweddell; Barbara J. Deal; Anke K. Furck; Geoffrey L. Rosenthal; Richard G. Ohye; Nancy S. Ghanayem; John P. Cheatham; Wayne Tworetzky; Gerard R. Martin

2012

Subjects
  • Health Sciences, Medicine and Surgery
  • Health Sciences, General
  • File Download
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Abstract:Close

In the recent era, no congenital heart defect has undergone a more dramatic change in diagnostic approach, management, and outcomes than hypoplastic left heart syndrome (HLHS). During this time, survival to the age of 5 years (including Fontan) has ranged from 50% to 69%, but current expectations are that 70% of newborns born today with HLHS may reach adulthood. Although the 3-stage treatment approach to HLHS is now well founded, there is significant variation among centers. In this white paper, we present the current state of the art in our understanding and treatment of HLHS during the stages of care: 1) pre-Stage I: fetal and neonatal assessment and management; 2) Stage I: perioperative care, interstage monitoring, and management strategies; 3) Stage II: surgeries; 4) Stage III: Fontan surgery; and 5) long-term follow-up. Issues surrounding the genetics of HLHS, developmental outcomes, and quality of life are addressed in addition to the many other considerations for caring for this group of complex patients.

Article

Effect of Flow Pulsatility on Modeling the Hemodynamics in the Total Cavopulmonary Connection

by Reza H. Khiabani; Maria Restrepo; Elaine Tang; Diane De Zelicourt; Fotis Sotiropoulos; Mark Fogel; Ajit Yoganathan

2012

Subjects
  • Engineering, Biomedical
  • Biophysics, General
  • File Download
  • View Abstract

Abstract:Close

Total cavopulmonary connection is the result of a series of palliative surgical repairs performed on patients with single ventricle heart defects. The resulting anatomy has complex and unsteady hemodynamics characterized by flow mixing and flow separation. Although varying degrees of flow pulsatility have been observed in vivo, non-pulsatile (time-averaged) boundary conditions have traditionally been assumed in hemodynamic modeling, and only recently have pulsatile conditions been incorporated without completely characterizing their effect or importance. In this study, 3D numerical simulations with both pulsatile and non-pulsatile boundary conditions were performed for 24 patients with different anatomies and flow boundary conditions from Georgia Tech database. Flow structures, energy dissipation rates and pressure drops were compared under rest and simulated exercise conditions. It was found that flow pulsatility is the primary factor in determining the appropriate choice of boundary conditions, whereas the anatomic configuration and cardiac output had secondary effects. Results show that the hemodynamics can be strongly influenced by the presence of pulsatile flow. However, there was a minimum pulsatility threshold, identified by defining a weighted pulsatility index (wPI), above which the influence was significant. It was shown that when wPI < 30%, the relative error in hemodynamic predictions using time-averaged boundary conditions was less than 10% compared to pulsatile simulations. In addition, when wPI < 50, the relative error was less than 20%. A correlation was introduced to relate wPI to the relative error in predicting the flow metrics with non-pulsatile flow conditions.
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