Normal Variant or Disease? – Veterinary ECG Quiz

Dog (Recorded with Beecardia)

Male

Question

What rhythm is shown on this tracing?

Sinus arrhythmia

Sinus tachycardia

Normal sinus rhythm

Atrial fibrillation

Dog (Recorded with Beecardia)

12 years • Female • Episode of collapse; previously noted to have sinus tachycardia

Question

How would you classify the rhythm on this tracing?

Sinus arrhythmia

Atrial fibrillation

Sinus tachycardia

Atrial premature complexes

Cat - DLH (Recorded with Beecardia)

13 years • Male • Recheck ECG after treatment for urethral obstruction; previously documented severe hyperkalemia has resolved

Question

Which rhythm diagnosis best fits this tracing?

Ventricular premature complexes

Normal sinus rhythm

Ventricular tachycardia

Sinus arrhythmia

Dog (Recorded with Beecardia)

9 years • Male • Atropine response test performed after bradycardia was noted under anesthesia during a prior procedure

Question

How would you interpret the rhythm on this pre-atropine tracing?

Atrial fibrillation - an abnormal rhythm

Second-degree AV block - often a vagal variant

Frequent ventricular premature complexes - an abnormal rhythm

Normal sinus arrhythmia - a physiologic variant

Cat - Russian Blue (Recorded with Beecardia)

12 years • Female

Question

How would you classify this cat's heart rhythm?

Sinus tachycardia

Normal sinus rhythm

Atrial fibrillation

Supraventricular tachycardia

Dog (Recorded with Beecardia)

Male

Question

How would you characterize the significance of the ventricular ectopy seen on this tracing?

Occasional uniform ectopic beats - warrants further cardiac evaluation

Frequent, multiform ectopy with couplets and runs - warrants further cardiac evaluation

A single isolated ventricular premature complex - an incidental finding

Sustained ventricular tachycardia - warrants emergency intervention

Cat - Birman (Recorded with Beecardia)

6 years • Female

Question

Which rhythm diagnosis best fits this tracing?

Atrial premature complexes

Atrial fibrillation

Normal sinus rhythm

Ventricular premature complexes

Dog (Recorded with Beecardia)

6 years • Male • Presented for a recheck ECG

Question

Which interpretation best fits this rhythm?

Sinus arrhythmia

Atrial fibrillation

Frequent atrial premature complexes

Supraventricular tachycardia

Dog - West Highland White Terrier (Recorded with Beecardia)

13 years • Male • Recently diagnosed with diabetes mellitus. Bradycardia noted on exam with no murmur. Mild cardiomegaly on thoracic radiographs. Owner reports lethargy

Question

This dog is lethargic with a recently diagnosed systemic illness. How should you interpret this rhythm?

Sinus arrhythmia - a normal variant in this dog

Third-degree AV block - refer for pacemaker evaluation

Frequent atrial premature complexes - an incidental finding

Sinus rhythm with progressive PR prolongation and pauses - evaluate further

Cat - Domestic Medium Hair (Recorded with Beecardia)

13 years • Female • Presented for vomiting and lethargy; bloodwork at that time indicated diabetes. Later developed hind-end weakness and was found to have an arrhythmia; bloodwork on that occasion was normal

Question

How would you interpret this rhythm, and does it need further work-up?

Sinus arrhythmia - a normal physiologic variant that needs no work-up.

Atrial premature complexes - worth investigating if they are frequent.

Third-degree AV block - significant, with a risk of sudden death.

Second-degree AV block - often vagal; an atropine response test distinguishes.

Quiz: Normal Variant or Disease?

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Quiz: Normal Variant or Disease?

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