title: A report of atrial parasystole.
mesh_terms: D000200:Action Potentials; D001145:Arrhythmias, Cardiac / Q000150:complications* / Q000503:physiopathology; D006325:Heart Atria / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D012849:Sinoatrial Node / Q000503:physiopathology