Novel mutations in the KCND3-encoded Kv4.3 K+ channel associated with autopsy-negative sudden unexplained death.

Heritable arrhythmia syndromes, including Brugada syndrome (BrS) and idiopathic ventricular fibrillation (IVF), may serve as the pathogenic basis for autopsy-negative sudden unexplained death (SUD) and sudden infant death syndrome (SIDS). Emerging evidence has linked perturbations in the transient outward current (I(to) ) conducted by the KCND3-encoded Kv4.3 pore-forming α-subunit to BrS or IVF.

Functional disability in adolescents with orthostatic intolerance and chronic pain.

A retrospective review identified 99 adolescents (79% female) referred to a tertiary care center to evaluate the relationship between symptoms of orthostatic intolerance and chronic pain. Regression analysis indicated that functional disability was strongly associated with pain intensity (P < .001) and depression (P = .