Is the Rhythm Normal? – Veterinary ECG Quiz

Dog - Cockapoo (Recorded with Beecardia)

6 months • Female • 5.5 kg • Pre-operative ECG evaluation

Question

Which rhythm best fits this ECG?

Normal sinus rhythm

Sinus arrhythmia

Atrial fibrillation

Second-degree AV block

Dog - Pug (Recorded with Beecardia)

12 years • Male

Question

How would you classify the rhythm shown?

Normal sinus rhythm

Atrial fibrillation

Sinus tachycardia

Sinus arrhythmia

Dog - Labrador Retriever mix (Recorded with Beecardia)

10 years • Female • Presented for acute forelimb lameness; an irregular rhythm was noted on auscultation before planned sedation for a CT scan of the limb

Question

An irregular rhythm was heard on auscultation - which interpretation best fits this tracing?

Sinus arrhythmia

Normal sinus rhythm

Sinus rhythm with ventricular premature complexes

Atrial fibrillation

Cat - Domestic shorthair (Recorded with Beecardia)

8 months • Male

Question

Which rhythm diagnosis fits this tracing?

Sinus tachycardia

Normal sinus rhythm

Atrial fibrillation

Supraventricular tachycardia

Dog - Caucasian Shepherd (Recorded with Beecardia)

9 years • Female • Presented for weakness and a distended abdomen; an arrhythmia with pulse deficits was noted on physical exam

Question

Which rhythm best fits this ECG?

Atrial fibrillation

Sinus arrhythmia

Supraventricular tachycardia

Atrial premature complexes

Dog - Great Dane (Recorded with Beecardia)

2 years • Male • 1-2 month history of decreased activity and significant weight loss; an irregular heart rhythm was noted by the owner and confirmed on physical exam

Question

Which rhythm best explains this tracing?

Atrial fibrillation

Sinus arrhythmia

Sinus tachycardia

Supraventricular tachycardia

Dog - German Shepherd Mix (Recorded with Beecardia)

14 years • Male • Progressive heart murmur, increased from grade 1/6 to grade 3/6

Question

Which rhythm best fits this tracing?

Third-degree (complete) AV block

High-grade second-degree AV block

A single non-conducted P wave (isolated dropped beat)

Sinus arrhythmia

Dog - Labrador Retriever (Recorded with Beecardia)

11 years • Male • Senior dog scheduled for a dental procedure; ECG obtained for pre-anesthetic evaluation

Question

Would you flag this rhythm before proceeding with anesthesia, or is it a normal finding?

Yes - the pattern suggests third-degree AV block, which should prompt cardiology clearance before anesthesia.

Yes - the pattern suggests sinus node dysfunction, which could worsen further once the dog is sedated.

No - this is a junctional escape rhythm and needs no action beyond routine anesthetic monitoring.

No - this is a slow but regular sinus rhythm and, by itself, does not require delaying anesthesia.

Cat - Domestic shorthair (Recorded with Beecardia)

7 years • Male • Weight loss was reported, with normal activity and appetite. Bradycardia and an irregular rhythm were noted on exam, along with slightly weak pulses

Question

Is this rhythm a normal variant, or does it call for further work-up?

A normal variant: a relaxed resting rhythm that needs no follow-up

An isolated dropped beat: a single non-conducted P wave that can be monitored

A significant abnormality: complete AV block requiring further evaluation

A significant abnormality: high-grade second-degree AV block requiring further evaluation

Dog - Golden retriever (Recorded with Beecardia)

3 years • Male

Question

More than one run of abnormal ventricular beats interrupts the underlying rhythm. Which diagnosis best fits the fastest run?

Accelerated idioventricular rhythm

Ventricular tachycardia

Supraventricular tachycardia

Atrial fibrillation

Quiz: Is the Rhythm Normal?

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Quiz: Is the Rhythm Normal?

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