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A, Mild sinus arrhythmia in a dog. There are P waves for every QRS complex, and P waves are related to the QRS complexes, which make this a sinus rhythm. The variation of the R-R intervals also is visible. An irregular sinus rhythm is a sinus arrhythmia. B, Sinus arrhythmia in the cat.
(From Edwards NF: Bolton's handbook of canine and feline electrocardiography, ed 2, Philadelphia, 1987, WB Saunders.)
