title: Poincaré plots and tachograms reveal beat patterning in sick sinus syndrome with supraventricular tachycardia and varying AV nodal block.
abstract: Using 24-h ambulatory electrocardiography, the RR intervals of all beats were determined in a West Highland white terrier with sick sinus syndrome characterized by long sinus pauses, bradycardia, supraventricular tachycardia (SVT) and varying degrees of atrioventricular (AV) heart block. Distinctive patterns of bradycardia and 1:1, 2:1, 3:1, 4:1 and 5:1 AV block associated with SVT were evident in the tachogram (RR interval distribution over time) and Poincaré plots (short-term heart rate variability plots of RRn versus RRn+1). These patterns differed from those of abrupt alteration in cycle length during long sinus pauses or bursts of supraventricular tachycardia. Recognition of such patterns may direct attention to time points for which close attention to the cardiac rhythm should be evaluated in the full-disclosure of the 24-h ECG recording.
authors.affiliation: Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Andrea
authors.initials: A
authors.lastname: Gladuli
authors.forename: N Sydney
authors.initials: NS
authors.lastname: Moïse
authors.forename: Shari A
authors.initials: SA
authors.lastname: Hemsley
authors.forename: Niels F
authors.initials: NF
authors.lastname: Otani
mesh_terms: D000818:Animals; D000889:Anti-Arrhythmia Agents / Q000627:therapeutic use; D001262:Atenolol / Q000627:therapeutic use; D054537:Atrioventricular Block / Q000473:pathology / Q000628:therapy / Q000662:veterinary*; D002940:Circadian Rhythm; D004283:Dog Diseases / Q000473:pathology* / Q000628:therapy; D004285:Dogs; D004562:Electrocardiography / Q000662:veterinary*; D008297:Male; D010138:Pacemaker, Artificial / Q000662:veterinary; D012804:Sick Sinus Syndrome / Q000473:pathology / Q000628:therapy / Q000662:veterinary*; D013617:Tachycardia, Supraventricular / Q000473:pathology / Q000628:therapy / Q000662:veterinary*
chemical_list: D000889:Anti-Arrhythmia Agents; D001262:Atenolol