Subtle ECG Findings – Veterinary ECG Quiz

Dog - Boxer (Recorded with Beecardia)

7 years • Male • Pre-anesthetic ECG screening

Question

Which interpretation fits this recording as a whole?

Sinus rhythm with isolated ventricular premature complexes

Sinus rhythm with isolated atrial premature complexes

Sinus rhythm with intermittent ventricular tachycardia

Sinus rhythm throughout, with no ectopic beats

Cat - Birman (Recorded with Beecardia)

6 years • Female

Question

Which combination of findings best fits this recording?

Sinus rhythm with ventricular premature complexes and short ventricular runs

Atrial fibrillation with intermittent bursts of rapid ventricular response

Sinus rhythm with atrial premature complexes and short supraventricular runs

Sinus rhythm with intermittent second-degree AV block interrupting the rhythm

Cat - DSH (Recorded with Beecardia)

13 years • Male • Previously evaluated for an arrhythmia

Question

The ventricular rate alone understates what is wrong in this recording. Which abnormality is present?

Sinus arrest with ventricular escape beats

High-grade second-degree AV block with ventricular escape beats

Complete (third-degree) AV block with a ventricular escape rhythm

Sinus rhythm with non-conducted atrial premature complexes

Dog - Cocker spaniel (Recorded with Beecardia)

12 years • Female • Episodes of falling and fainting. Recording obtained 30 minutes after subcutaneous atropine as an atropine response test

Question

Long pauses repeatedly interrupt this rhythm. Which mechanism best explains them?

Sinus arrest from sinus node dysfunction

Non-conducted atrial premature complexes blocking at the AV node

High vagal tone producing exaggerated respiratory sinus arrhythmia

Second-degree AV block with intermittently non-conducted P waves

Cat (Recorded with Beecardia)

1 year • Female

Question

Which finding argues against a ventricular origin for this tachycardia?

Each QRS follows a P wave at a fixed PR interval

The R-R interval stays regular from one beat to the next

The mean electrical axis is markedly deviated to the right

The ventricular rate is well above 200 beats per minute

Dog (Recorded with Beecardia)

8 years • Male

Question

Occasional complexes in this recording differ from the rest. What best explains them?

Motion artifact mimicking ectopic beats

Atrial premature complexes with aberrant conduction

Intermittent change in bundle branch block

Single ventricular premature complexes

Cat - DSH (Recorded with Beecardia)

5 years • Female

Question

How would you classify the rhythm in this tracing?

Sinus arrest with junctional escape beats

Second-degree AV block, Mobitz type II

Second-degree AV block, Mobitz type I

Third-degree AV block with escape rhythm

Dog (Recorded with Beecardia)

Male

Question

Find the single ventricular premature complex in this recording. Which feature of that beat is most important when assessing its potential significance?

Whether it is followed by a full compensatory pause

How much wider its QRS is than the sinus complexes

Whether its morphology is left or right bundle branch block type

Where it falls relative to the preceding T wave

Dog - Basset Hound (Recorded with Beecardia)

7 years • Female

Question

The predominant rhythm here is an accelerated idioventricular rhythm. Which finding would confirm that sinus impulses are still reaching the ventricles during that rhythm?

P waves marching through the wide complexes without altering their shape

Beats of intermediate QRS shape appearing where the two rhythms meet

A compensatory pause following each wide complex

All the wide complexes sharing one identical QRS morphology

Dog - Golden Retriever (Recorded with Beecardia)

1 year • Male

Question

Which next step should take priority for this dog?

Arrange 24-hour Holter monitoring to quantify the arrhythmia

Refer for pacemaker implantation to secure the ventricular rate

Measure serum potassium and assess renal function

Obtain thoracic radiographs to characterize the cardiac enlargement

Quiz: Subtle ECG Findings

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Quiz: Subtle ECG Findings

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