RT Journal A1 Blum A, Podovitzky O, Sheiman J, Khasin M T1 REversal of first-degree atrioventricular block in fabry disease JF Archives of Internal Medicine JO Archives of Internal Medicine YR 2009 FD November 9 VO 169 IS 20 SP 1925 OP 1926 DO 10.1001/archinternmed.2009.334 UL http://dx.doi.org/10.1001/archinternmed.2009.334 AB Fabry disease is an X-linked disorder of glycosphingolipid catabolism that results from deficient activity of the lysosomal enzyme α-galactosidase A in the vascular smooth muscle, the myocardium, the central nervous system, and epithelial cells of the glomeruli, causing accumulation of globotriaosylceramide, the glycosphingolipid substrate for this enzyme. Five years ago we published a case report of a 26-year-old man with Fabry disease who had first-degree atrioventricular (AV) block with right bundle branch block and diastolic dysfunction with a restrictive pattern. In the last few years he was treated with α-galactosidase A. Recently he was readmitted for left leg cellulitis, and surprisingly we found that his electrocardiogram and echocardiogram patterns were improved, with the disappearance of the AV block and diastolic dysfunction.