title: Double-bifocal-ventricular parasystole.
mesh_terms: D000368:Aged; D005117:Cardiac Complexes, Premature / Q000150:complications / Q000503:physiopathology*; D004562:Electrocardiography; D006352:Heart Ventricles / Q000503:physiopathology*; D006801:Humans; D008297:Male