Probabilities of heart donors arising within specified times for child recipients

Area of Science:

• Pediatric Cardiology
• Transplant Surgery
• Organ Donation Statistics

Background:

• Urgent heart transplantation is critical for children with end-stage heart failure.
• Donor heart availability is a major limiting factor in pediatric heart transplantation.
• Understanding donor-recipient matching factors is essential for improving outcomes.

Purpose of the Study:

• To determine the likelihood of suitable donor heart availability for pediatric recipients based on blood group and body weight.
• To analyze donor heart availability within critical timeframes for urgent pediatric heart transplantation.
• To inform strategies for optimizing organ allocation in pediatric heart transplantation.

Main Methods:

• Analysis of the Australia and New Zealand Organ Donor Registry data (1989-2004).
• Estimation of donor heart availability probabilities using a Poisson model.
• Consideration of ABO blood group compatibility, donor-recipient body weight ratios (0.8-4.0), and donor age (<40 years).

Main Results:

• Donor heart availability probabilities increase with waiting time (10-180 days) and decrease with recipient competition.
• Maximum suitable donor availability is observed for children weighing 20 kg across all blood groups.
• Within 40 days, probabilities for 20 kg recipients range from 0.67 (O) to 0.89 (AB); for 3 kg recipients, 0.09 (O) to 0.16 (AB); and for 60 kg recipients, 0.42 (O) to 0.66 (AB).

Conclusions:

• Suitable donor heart availability within 40 days is low for infants (<0.3 probability).
• Availability is moderate for small children (0.5-0.9 probability) and modest for larger children (0.4-0.7 probability).
• Outcomes vary by blood group and waiting time across all pediatric body weights.