ECG 21

Signalment: Eleven-year-old spayed female West Highland White Terrier (Maille)

Presenting complaint: Lethargy and episodes of rear limb collapse

Resting ECG on presentation

ECG 21

Quiz

1. What rhythm disturbance occurs after the third QRS complex?

2. What type of complex is the 4th complex (one immediately after the pause)?

3. The rate of the last 6 complexes varies but on average is in the 60 to 70 bpm range. Note the negative P waves immediately behind each QRS complex. Where are these complexes originating from?

ECG taken 30 minutes after 0.04 mg/kg atropine subQ

ECG 21 post atropine

Quiz

1. What is the heart rate?

2. Note the negative P wave in front of each QRS complex. Where is this rhythm most likely originating from?

ECG taken under anesthesia - temporary pacemaker was on for the first 7 beats and was then turned off (two sequential ECGs)

ECG 21 under anesthesia 1

ECG 21 under anesthesia 2

Quiz

1. How long is the pause after the temporary pacemaker is turned off?

2. Where do the first two escape beats originate from?

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