title: Differentiation of 2:1 A-V block from sinus bradycardia as diagnosed by echocardiography.
mesh_terms: D000368:Aged; D001919:Bradycardia / Q000175:diagnosis*; D003937:Diagnosis, Differential; D004452:Echocardiography; D006327:Heart Block / Q000175:diagnosis*; D006801:Humans; D008297:Male