title: Ultrastructural changes in atrial sympathetic nerves during perfusion with solutions deficient in sodium and compensated by potassium or urea [proceedings].
mesh_terms: D000818:Animals; D006321:Heart / Q000294:innervation*; D066298:In Vitro Techniques; D010477:Perfusion; D011188:Potassium / Q000494:pharmacology*; D051381:Rats; D012964:Sodium / Q000494:pharmacology*; D013564:Sympathetic Nervous System / Q000187:drug effects / Q000648:ultrastructure*; D014508:Urea / Q000494:pharmacology*
chemical_list: D014508:Urea; D012964:Sodium; D011188:Potassium