Commentator Discussion: Heart transplant survival and the use of donors with intracranial bleeding: United Network for Organ Sharing registry propensity-matched analysis

Meyer and colleagues are to be congratulated on this large analysis of United Network for Organ Sharing (UNOS) registry recipients in the predonation after cardiac death era.I have 3 questions, one donor-related, one recipientrelated, and one general.As you so convincingly presented, there have been several studies that have addressed this question in the past, and so we know that intracranial bleed heart donors are typically older, more often female, smokers, diabetic, and hypertensive, and your study uses propensity matching to adjust for a number of important factors, but among these, really only donor age is included as far as the donor factors.Are the others not important?And why does just adjusting for age remove the adverse effect of donor intracranial bleed on long-term outcome?