title: Relation of variations in activation order to intraventricular pressures during premature beats.
mesh_terms: D000818:Animals; D001794:Blood Pressure; D005117:Cardiac Complexes, Premature / Q000503:physiopathology*; D004285:Dogs; D006321:Heart / Q000502:physiology*; D006329:Heart Conduction System; D006352:Heart Ventricles; D010138:Pacemaker, Artificial