Wide-complex tachycardia, possibly WPW syndrome.
D003937:Diagnosis, Differential; D004562:Electrocardiography; D006352:Heart Ventricles; D006801:Humans; D008297:Male; D008875:Middle Aged; D013610:Tachycardia / Q000175:diagnosis*; D014927:Wolff-Parkinson-White Syndrome / Q000175:diagnosis*