title: Circadian variation in ventricular refractoriness.
authors.forename: E H
authors.initials: EH
authors.lastname: Friedman
mesh_terms: D001341:Autonomic Nervous System / Q000502:physiology; D002940:Circadian Rhythm / Q000502:physiology*; D006352:Heart Ventricles / Q000294:innervation*; D006801:Humans; D012032:Refractory Period, Electrophysiological / Q000502:physiology*