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Aims Anderson–Fabry disease (AFD) is a rare genetic lysosomal storage disorder which often goes unnoticed until the onset of symptoms requires aggressive treatment. Prompt diagnosis remains crucial. Dedicated centres may offer a remarkable opportunity to develop early detection strategies and prompt appropriate multidisciplinary management. To describe the long-term outcomes of patients diagnosed with AFD followed at a national Cardiomyopathy Referral Center according to phenotype (clinical involvement vs. sub-clinical involvement). Methods and results Consecutive patients visited at our Cardiomyopathy Unit from 1989 to 2020 with &amp;gt;1-year follow-up were retrospectively reviewed. Clinical involvement was defined by the presence of one among left ventricular hypertrophy (LVH)&amp;gt;15 mm, presence of conduction blocks or cardiac implantable electronic devices (CIED), atrial fibrillation, kidney disease (glomerular filtration rate &amp;lt;60 ml/min/m2, dialysis or kidney transplant), stroke or transient ischaemic attack (TIA). Disease progression was defined by either de novo CIED implantation, de novo LVH &amp;gt; 15mm or increased IVS, de novo Stroke/TIA, or progression of kidney disease. Overall, 110 were diagnosed with AFD [first via α galactosidase (αGAL) activity and then confirmed via genetic exam], and 86 (78%) with &amp;gt;1-year follow-up were selected. Clinical involvement was present in 60 (70%) patients. Age at diagnosis was similar between patients with clinical and subclinical phenotype (42 ± 17 vs. 39 ± 15, P = 0.277). Patients manifesting clinical involvement compatible with AFD were more frequently men [N = 25 (42%) vs. 4 (15%), P = 0.025] and probands (P = 0.01). Overall, one organ involvement was present in 31 (52%) patients, two organ involvement in 24 (40%) patients, and three organs in 5 (8%). A total of 46 (77%) patients were referred for enzyme replacement therapy (ERT): 52% received agalsidase α, 26% agalsidase β, and 22% migalastat. Among those with a clinical involvement not on ERT, nine (15%) were scheduled for ERT initiation, three (5%) were considered old for ERT, one (1.5%) refused ERT, and one (1.5%) had an allergic reaction to ERT. At 7 (3–12) years follow-up, both study cohorts manifested signs and symptoms of disease progression, although its incidence was higher in patients with clinical involvement [N = 28 (47%, 4.7%/year) vs. N = 4 (15%, 1.5%/year), in clinical vs. subclinical involvement, respectively, P = 0.01]. The main causes for diseases progression were increase in LVH (28%), de novo LVH (13%), progression of kidney disease (7%), and CIED implantation (5%). All patients with disease progression in the subclinical involvement group had been diagnosed with family screening; among these, two were men and one had a late onset phenotype. Three developed LVH &amp;gt; 15mm and one kidney disease. Conclusions Clinical involvement in AFD is frequent irrespective of age at diagnosis, being present in more than 1-in-2 patients at baseline. Prompt referral to dedicated centres is warranted for appropriate care as disease may progress in both patients with and without initial clinical involvement despite optimal medical management.

749 Clinical profile and outcome of patients with Anderson–Fabry disease followed at a multidisciplinary cardiomyopathy centre