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Indications and contraindications for heart transplantation in infancy
M M Boucek1, C M Mathis, A Razzouk
1Department of Pediatrics/Pediatric Cardiology, University of Colorado/The Children's Hospital, Denver.
Insights
Infant heart transplantation offers survival for complex congenital heart disease (CCHD) and myopathies. An algorithm improves survival rates by selecting candidates with lower pre- and post-transplant death risks.
Area of Science:
- Pediatric Cardiology
- Transplantation Surgery
- Critical Care Medicine
Background:
- Infant heart transplantation is vital for irreversible myopathies and complex congenital heart disease (CCHD).
- Current 1-year survival is 85%, with potential to reach 95% by managing perioperative variables.
- A significant pre-transplant mortality (15-20%) highlights the need for optimized organ allocation.
Purpose of the Study:
- To develop an algorithm maximizing survival for infants undergoing heart transplantation.
- To improve donor organ utilization by prioritizing patients with the greatest need and lowest risk.
- To refine selection criteria for infant heart transplantation candidates.
Main Methods:
- A risk-factor-based algorithm was developed considering hemodynamic stability, central venous access, ventilator support, atrial septal defect restriction, pulmonary hypertension, anomalous pulmonary venous return, and sepsis history.
- The algorithm stratifies patients based on predicted pre- and post-transplant mortality risk.
Main Results:
- Transplantation is recommended for CCHD patients with <20% predicted mortality risk to maximize overall survival.
- Donor organs are best reserved for myopathy patients and CCHD patients with <10% predicted mortality risk for optimal utilization.
- The algorithm effectively identifies candidates likely to benefit most from heart transplantation.
Conclusions:
- The developed algorithm enhances infant heart transplantation outcomes by optimizing patient selection.
- Careful risk assessment improves both patient survival and efficient use of limited donor organs.
- The algorithm provides a framework for dynamic adjustments based on surgical risks and donor availability.
Abstract:
Heart transplantation uniquely offers infants with irreversible myopathies and complex congenital heart disease (CCHD) the potential for survival. Heart transplantation in the first year of life has an actuarial 1-year survival rate of 85%. Controlling for the variables that lead to perioperative death can improve 1-year survival rates to 95%. Mortality is also accrued before transplantation, with 15% to 20% of infants dying before a donor organ is available. Because of this cumulative mortality, an algorithm was developed to maximize pre- and posttransplantation survival and thus increase the likelihood that the limited donor supply would have the greatest impact. The risk factors considered in the algorithm include: (1) hemodynamic stability, (2) central venous access/prostaglandin requirements, (3) need for ventilator support, (4) pulmonary blood flow dependent on a critically restricted atrial septal defect, (5) risk for pulmonary hypertension, (6) anomalous pulmonary venous return, and (7) history of sepsis. Overall, patient survival would be maximized by only using transplantation for patients with CCHD who have moderate or less risk of pre- or posttransplantation death (< 20%). Donor organ utilization could be maximized by reserving transplantation for patients without options (myopathies) and for patients with CCHD who have a low predicted risk of death (< 10%). Because the risks of death at transplantation or in the first year after transplantation are low and relatively fixed, changes in risks of palliative surgery or donor availability can be easily used to adjust the decision algorithm.