NGF and Schnyder corneal dystrophy: The study of native hearts of transplant recipients has demonstrated that regional reinnervation was associated with a history of spontaneous VA and might be responsible for the occurrence of VA and SCD in these patients.6 This causal relationship was further validated by an animal study in which nerve growth factor was infused to the left SG in dogs with chronic MI and an AV block was performed to augment SN sprouting and to create a successful model of spontaneous VT, VF, and SCD.37 Considering these results, SN sprouting may be an important determinant of VA and SCD in chronic MI.