title: Anterograde sinuatrial conduction evaluated by sinus node electrogram in atropine blocked retrograde atrial conduction.
abstract: Two cases are described where atropine induced the disappearance of reset zone as response to premature atrial stimulation for blocked retrograde atrial conduction. Because of this, sinuatrial conduction time could not be estimated. The sinus node electrogram allowed the direct measurement of sinuatrial conduction and showed a facilitated anterograde conduction through the perinodal fibers after administration of the drug.
mesh_terms: D001285:Atropine; D002304:Cardiac Pacing, Artificial; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012848:Sinoatrial Block / Q000175:diagnosis* / Q000503:physiopathology; D012849:Sinoatrial Node / Q000187:drug effects* / Q000503:physiopathology
chemical_list: D001285:Atropine