Bradyarrhythmia has recently been described as a distinctive prodrome of voltage-gated potassium channel complex/leucine-rich glioma inactivated 1 antibody encephalitis (VGKC/LGI1–ab) leading to pacemaker implantation in 3 cases (23), just as in one of our patients. The gene discussed is LGI1; the disease is encephalitis.