title: Progressively decreasing ectopic to second sinus beat intervals in concealed trigeminy.
abstract: A case of classical concealed trigeminy is reported in which the concealed ventricular extrasystoles occur due to a progressive shortening of the intervals in between manifest extrasystoles and their subsequent conducted second sinus beats. The specific mechanisms underlying such a remarkable phenomenon remain to be explained.
mesh_terms: D000368:Aged; D005117:Cardiac Complexes, Premature / Q000503:physiopathology*; D004562:Electrocardiography; D006801:Humans; D008297:Male; D011674:Pulse; D013610:Tachycardia / Q000503:physiopathology*