title: Concealed pre-excitation.
mesh_terms: D001145:Arrhythmias, Cardiac / Q000175:diagnosis* / Q000209:etiology; D001283:Atrioventricular Node / Q000503:physiopathology*; D004594:Electrophysiology; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D013610:Tachycardia / Q000175:diagnosis / Q000209:etiology; D014927:Wolff-Parkinson-White Syndrome / Q000175:diagnosis / Q000209:etiology