title: Terminology and electrophysiologic concepts in cardiac arrhythmias. IV. Fusion beats and summation of impulses.
mesh_terms: D000818:Animals; D001145:Arrhythmias, Cardiac / Q000503:physiopathology*; D003937:Diagnosis, Differential; D004562:Electrocardiography; D004594:Electrophysiology; D006325:Heart Atria / Q000503:physiopathology; D006352:Heart Ventricles / Q000503:physiopathology; D010138:Pacemaker, Artificial; D011817:Rabbits; D013610:Tachycardia / Q000503:physiopathology; D014927:Wolff-Parkinson-White Syndrome / Q000503:physiopathology