title: A report of an ECG showing unusual manifest and concealed trigeminy.
mesh_terms: D001146:Arrhythmia, Sinus / Q000503:physiopathology*; D005117:Cardiac Complexes, Premature / Q000503:physiopathology; D004562:Electrocardiography; D006352:Heart Ventricles; D006801:Humans; D008297:Male; D008875:Middle Aged