Pre-excitation of the ventricles.
D003937:Diagnosis, Differential; D004562:Electrocardiography; D006352:Heart Ventricles; D006801:Humans; D009203:Myocardial Infarction / Q000175:diagnosis; D013610:Tachycardia / Q000175:diagnosis; D013614:Tachycardia, Paroxysmal / Q000175:diagnosis; D014927:Wolff-Parkinson-White Syndrome / Q000175:diagnosis*