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. 2024 Sep;65(9):874–879.

FIGURE 2.

FIGURE 2

A — Full disclosure of an electrocardiogram (ECG) recording obtained with a Holter monitor from a female dog during a syncope event. Bradycardia started at 06:41:00, followed by 16 s of sinus arrest, from 06:41:17 to 06:41:33. Paper speed = 25 mm/s; 1 cm = 1 mV.

B — An ECG recording obtained with a Holter monitor during a syncope event. Before the occurrence of sinus arrest, the PR interval remained constant, but the RR interval gradually started to irregularly lengthen. Subsequently, coughing occurred (arrow, as mentioned by the owner), accompanied by the onset of sinus arrest. Intermittent escape beats were observed (arrowheads) and the return to a clear sinus rhythm was noted (asterisk). The ECGs are not continuous. Paper speed = 25 mm/s; 1 cm = 1 mV.