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Alpha-Gal Syndrome and Aortic Valve Replacement
Nabeel Sami1, Bharat Ravishankar1, Berhane Worku2
1Division of Cardiology, Department of Medicine, New York Presbyterian Brooklyn Methodist Hospital, Brooklyn, New York, USA.
Background:
Alpha-gal syndrome (AGS) is an IgE-mediated hypersensitivity response to galactose-alpha-1,3-galactose (alpha-gal), an oligosaccharide present in beef and pork. This complicates bioprosthetic heart valve selection, as both bovine and porcine valves contain alpha-gal, posing risks of allergic reaction and potentially accelerated structural valve degeneration.
Case Summary:
A 78-year-old man with AGS and severe symptomatic aortic stenosis underwent transcatheter aortic valve replacement with a porcine-derived Evolut FX 29-mm valve following multidisciplinary evaluation. Preoperative allergist-guided prophylaxis, including IgE risk stratification, antihistamines, and corticosteroids, enabled successful implantation without complications.
Discussion:
Bioprosthetic valves may pose unique risks for individuals sensitized to alpha-gal, where an alpha-gal IgE to total IgE ratio ≤5% is a proposed threshold in which patients can be rechallenged with animal products. This case highlights the successful management of a slightly higher ratio.
Take-Home Message:
The interplay between AGS, bioprosthetic valve selection, and structural valve durability necessitates an individualized approach to mitigate the hypersensitivity risks.
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