DEFINITION
Sinus rhythm in which impulses arise from the sinoatrial node at a slower than normal rate
ECG Features
Dogs—sinus rate < 70 bpm (< 60 bpm in giant breeds)
Cars—sinus rate < 120 bpm at home or < 150 bpm at the clinic
Rhythm regular, often with a slight variation in R-R interval; may be irregular if bradycardia due to high vagal tone
Normal P wave for each QRS complex
P-R interval constant
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