Regular or Irregular? – Veterinary ECG Quiz

Dog (Recorded with Beecardia)

12 years • Male

Question

How would you classify the rhythm on this tracing?

Normal sinus rhythm

Sinus arrhythmia

Atrial fibrillation

Sinus tachycardia

Dog - Shih Tzu (Recorded with Beecardia)

7 years • Male

Question

Before trying to name this rhythm, what should you check first on the tracing - and what does it show?

The R-R intervals shorten and lengthen in a repeating cycle.

The R-R intervals vary with no consistent pattern at all.

The QRS complexes are too wide to judge spacing reliably.

The R-R intervals are essentially equal from beat to beat.

Dog - Labrador (Recorded with Beecardia)

12 years • Male • Diagnosed with dilated cardiomyopathy, managed with pimobendan. Asymptomatic

Question

How would you classify the regularity of this rhythm?

Regular, with a constant R-R interval throughout

Regularly irregular, with a cyclical R-R pattern

Irregularly irregular, with no discernible R-R pattern

Regular, apart from a single early beat

Dog (Recorded with Beecardia)

12 years • Female • Sent for pre-operative (pre-anesthetic) evaluation

Question

How would you classify the rhythm on this tracing?

Sinus arrhythmia

Atrial fibrillation

Sinus tachycardia

Supraventricular tachycardia

Dog (Recorded with Beecardia)

7 years

Question

Which rhythm diagnosis best fits this ECG?

Sinus arrhythmia

Sinus tachycardia

Supraventricular tachycardia

Atrial fibrillation

Dog - Cocker Spaniel (Recorded with Beecardia)

13 years • Male • A heart murmur was noted on exam, and bradycardia was noted today. The patient is otherwise clinically well but has severe dental disease

Question

How would you characterize this rhythm?

Second-degree atrioventricular block

Frequent atrial premature complexes

Sinus arrhythmia

Frequent ventricular premature complexes

Cat - Domestic Shorthair (Recorded with Beecardia)

6 years • Male

Question

Is anything abnormal in this tracing, and if so, what is it?

Normal sinus rhythm

Sinus arrhythmia

Ventricular bigeminy

Atrial fibrillation

Dog (Recorded with Beecardia)

Male • Prior history of suspected endocarditis, previously well controlled at home, with episodes of quiet/tired behavior after exercise. Presented for cardiology reassessment after auscultation revealed a heart rate over 280 bpm

Question

A vagal maneuver was performed during this recording. Which rhythm diagnosis best fits this ECG?

Supraventricular tachycardia

Sinus tachycardia

Atrial fibrillation

Ventricular tachycardia

Cat - Domestic Shorthair (Recorded with Beecardia)

Question

Which statement about this ECG's rhythm is TRUE?

Every P wave is followed by a QRS complex, though the PR interval lengthens with each beat.

The ventricular rhythm is irregularly irregular, with no P waves seen anywhere in the tracing.

P waves and QRS complexes each occur at their own steady rate, independent of one another.

Two P waves occur for every QRS complex, keeping a constant P-to-QRS ratio throughout.

Dog (Recorded with Beecardia)

11 years • Recheck ECG in a dog being treated for a known ventricular arrhythmia; pulse deficits were noted on exam

Question

A brief run of wide QRS complexes interrupts the underlying rhythm on this tracing. Judging by the rate during that run, how would you classify it?

Accelerated idioventricular rhythm (AIVR)

Ventricular tachycardia

Supraventricular tachycardia with aberrancy

Sinus tachycardia with bundle branch block

Quiz: Regular or Irregular?

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Quiz: Regular or Irregular?

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