Unexpected Hypotension in a Female Patient with Fabry Disease: Switching from Agalsidase α to β after Long-term ERT.

Fabry disease is a rare X-linked lysosomal storage disorder. Enzyme replacement therapies (ERTs), such as agalsidase α and β, are available treatment options. While infusion-related reactions (IRRs) are known to occur at the initiation of ERT owing to immune responses, there is limited information on IRRs during long-term ERT. We report the case of a female patient with Fabry disease who developed unexpected hypotension after six years of stable treatment with agalsidase α, leading to a switch to agalsidase β. Continuous monitoring may be essential to identify potential IRRs in female patients with Fabry disease receiving long-term ERT.