Nov 3, 2010

"Zone of avoidance": RR interval distribution in tachograms, histograms, and Poincaré plots of a Boxer dog

Journal of Veterinary Cardiology : the Official Journal of the European Society of Veterinary Cardiology
N Sydney MoïseNiels F Otani


The RR intervals of sinus and ventricular beats were determined by analysis of a 24-h ambulatory electrocardiogram in a Boxer before and after treatment with sotalol. These RR intervals were plotted using tachograms, histograms, and Poincaré plots. The tachogram demonstrated a 'band' wherein a range of RR intervals was infrequent, the histogram did not take the form of a single Gaussian distribution of RR intervals, and the Poincaré plot showed nonhomogeneous beat-to-beat variability. This type of patterning was described as a "zone of avoidance" potentially caused by the clustering of beats within specific ranges. Treatment with sotalol enhanced the "zone of avoidance". Further investigation is needed to understand the mechanism for this observation as well as any clinical implications.

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Mentioned in this Paper

Sinoatrial Node
Dog Diseases
Complex (molecular entity)
Electrocardiography, Ambulatory
Transcription Initiation
Sinus - General Anatomical Term
Holter Electrocardiography
Cardiac Depressants

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