Initial Clinical Experience With Partial Heart Transplantation for Mitral Valve Replacement: An Experimental Approach.
Douglas M Overbey, Joseph W Turek, Seth E M Wolf et al.
✦ AI-curated · Sources linked
Case in brief
Two pediatric patients underwent orthotopic mitral partial heart transplantation using donor valves with preserved subvalvular apparatus. Both grafts were initially competent, and both patients had early postoperative recovery. One patient had mild-to-moderate regurgitation at 8 months; the other developed progressive regurgitation within 2 months and required valve replacement. Histopathology showed graft integration and preserved leaflet and annular architecture, alongside papillary muscle necrosis consistent with ischemic injury. The authors considered subsequent change in chordal length a likely mechanism of regurgitation.
What made this case unusual
This initial experience applied partial heart transplantation to the mitral position, and histopathology linked papillary muscle necrosis with a likely mechanism for early graft regurgitation.
Diagnostic / clinical pearl
When mitral partial heart transplantation is followed by regurgitation, assess the subvalvular apparatus: papillary muscle ischemia and resulting chordal-length change may contribute even when leaflet and annular architecture are preserved.
Why it matters
The approach was technically feasible with early graft integration, but regurgitation and re-replacement in one patient underscore that mitral partial heart transplantation remains experimental.