title: ECG quiz: variation in P wave rate during AV block.
authors.forename: Krishan
authors.initials: K
authors.lastname: Soni
authors.forename: Jana
authors.initials: J
authors.lastname: Svetlichnaya
authors.forename: Nora
authors.initials: N
authors.lastname: Goldschlager
mesh_terms: D054537:Atrioventricular Block / Q000175:diagnosis* / Q000517:prevention & control*; D001919:Bradycardia / Q000175:diagnosis; D058409:Cardiac Resynchronization Therapy Devices; D003937:Diagnosis, Differential; D004562:Electrocardiography / Q000379:methods*; D005189:False Positive Reactions; D006801:Humans; D008297:Male; D008875:Middle Aged; D016896:Treatment Outcome