Abstract
<h3>Purpose</h3> In heart transplantation, donor-to-recipient (D-R) size matching has been done by height and weight. Recently, predicted heart mass (PHM) has been found to be more clinically useful to predict outcome. Using PHM, under-sizing a donor heart for a larger recipient with high pulmonary artery pressures leads to increased mortality. It has recently been noted in the ISHLT registry that there may be increased risk in placing an oversized donor heart using weight into a smaller recipient. This clinical outcome has not been established using PHM. We sought to address this question in our large, single center experience using PHM. <h3>Methods</h3> Between January 2010 and June 2020, we assessed 588 D-R heart matches. We used PHM to assess outcome differences when the donor hearts were oversized. We divided the D-R ratio by PHM into two categories: Normal (N: 90-110%, n=524), and markedly oversized (MO: greater than 140%, n=64). Outcomes included 1-year survival, freedom from 1-year rejection (acute cellular rejection [ACR], antibody-mediated rejection [AMR]), freedom from cardiac allograft vasculopathy (CAV: stenosis ≥30%), freedom from cardiac dysfunction (LVEF ≤40%), and freedom from non-fatal major adverse cardiac events (NF-MACE: myocardial infarction, new congestive heart failure, percutaneous coronary intervention, implantable cardioverter defibrillator/pacemaker implant, stroke). <h3>Results</h3> MO (n=64) compared to N (n=524) using PHM showed no difference in 1-year survival, freedom from ACR, freedom from CAV, freedom from NF-MACE, and freedom from cardiac dysfunction. There was a significantly lower freedom from 1-year AMR in the MO group due to more female recipients (sensitized due to previous pregnancies) in this group (71% MO group vs 20% N group). <h3>Conclusion</h3> Markedly oversized donor to recipient matching using PHM does not result in poor outcomes after heart transplantation. This has potential to expand the donor pool, particularly for smaller patients.
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