Natural recovery of cardiac allograft diastolic function, a retrospective longitudinal report.

Cardiac allografts suffer diastolic dysfunction early post-heart transplantation (HTx) due to ischemic injury, however the natural course of diastology recovery post HTx remains unknown (Tallaj et al., 2007 [1]). We retrospectively reviewed 60 adult HTx patients between 2015 and 2021 at a single site. Invasive hemodynamics and echocardiograms were obtained at 2 weeks and 1, 3, 6, and 12 months post-HTx. RA strain by 2D feature tracking was compared to intracardiac pressure measurements. In all patients, we observed normalization of RV and RA filling pressures by post-operative week 12 and recovery of diastolic dysfunction by month 6. There was an inverse correlation between RV end-diastolic pressure and RA contractile (r = -0.192, p < 0.05) and reservoir (r = -0.128, p < 0.05) functions in the allograft. As the post-transplant care paradigm shifts away from invasive procedures, right atrial indices should be included in imaging-based allograft surveillance studies.