title: Estimating vascular reactivity by iontophoretic injection of vasoactive agents.
mesh_terms: D005385:Fingers / Q000098:blood supply; D006632:Histamine / Q000008:administration & dosage; D006801:Humans; D007478:Iontophoresis; D009638:Norepinephrine / Q000008:administration & dosage; D010991:Plethysmography; D014666:Vasomotor System / Q000502:physiology*
chemical_list: D006632:Histamine; D009638:Norepinephrine