(49) compared 26 anti-SSA/Ro-positive patients with 20 anti-SSA/Ro-negative patients and found that the incidence of complex ventricular arrhythmias (Lown grade 2 to 5) was significantly higher in the anti-SSA/Ro-positive group (50% vs. 10%), thereby elevating the risk of SCD. This evidence concerns the gene CALR and Schnyder corneal dystrophy.