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VETERINARY CLINICAL CARDIOLOGY
CARDIOLOGY CONCEPTS
Electrocardiology
Normal ECG Parameters
1. Normal ECG Diagram

I. Diagram of Normal ECG with Location of Routine Measurements

2. Normal Small Animal Electrocardiographic Parameters
Normal Electrocardiographic Parameters in the Dog and Cat
Parameter Canine Feline
Heart Rate (beats per minute)

Adults: 70-160

Toy Breeds: up to 180

Puppies: up to 220

160-240
Rhythm

Normal sinus rhythm

Sinus arrhythmia

Wandering atrial pacemaker

Normal sinus rhythm

Sinus tachycardia

Intervals (seconds)
P < 0.04 < 0.04
PR 0.06 to 0.13 0.05 to 0.09
QRS

< 20 kg: < 0.05

> 20 kg: < 0.06

Giant breeds: < 0.065

< 0.04
QT 0.15 to 0.25 0.12 to 0.18
Parameter Canine Feline
Amplitudes (mV) in lead II
P < 0.4 < 0.2
R

< 20 kg: < 2.5

> 20 kg: < 3.0

< 0.9
MEA +40° to +100° -5° to +160°



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