Ventricular Arrhythmias – Veterinary ECG Quiz

Dog - Whippet (Recorded with Beecardia)

10 years • Male • Degenerative mitral valve disease, stage B2. A murmur and an arrhythmia were noted on examination; no clinical signs reported

Question

At first glance this looks like a normal sinus rhythm. Which interpretation best fits the entire tracing?

Normal sinus rhythm

Sinus rhythm with atrial premature complexes

Ventricular tachycardia

Sinus rhythm with ventricular premature complexes

Cat - DSH (Recorded with Beecardia)

10 years • Male

Question

Which interpretation best fits this ECG?

Atrial premature complexes

Ventricular premature complexes

Ventricular tachycardia

Motion artifact

Cat - DSH (Recorded with Beecardia)

14 years • Male

Question

Premature complexes interrupt the sinus rhythm in this tracing. Which finding tells you where they originate?

Wide, bizarre premature QRS complexes with no preceding P wave - ventricular origin

Early beats each introduced by an abnormally shaped premature P wave - atrial origin

Narrow premature QRS complexes identical to the sinus beats with no preceding P wave - junctional origin

An irregular baseline with no organized P waves at all - atrial fibrillation

Dog - Siberian Husky (Recorded with Beecardia)

13 years • Female • Syncopal episodes reported

Question

Premature complexes interrupt the underlying rhythm in this tracing. What is their origin?

Atrial premature complexes

Ventricular premature complexes

Junctional premature complexes

Sinus beats with intermittent bundle branch block

Cat - Domestic Shorthair (Recorded with Beecardia)

3 months • Male • Recently castrated; presented for a castration-site infection with an arrhythmia and pale mucous membranes noted on examination

Question

Which arrhythmia pattern best fits this tracing?

Ventricular trigeminy

Ventricular bigeminy

Atrial bigeminy

Nonsustained ventricular tachycardia

Cat - Domestic shorthair (Recorded with Beecardia)

12 years • Female • Receiving atenolol therapy

Question

The premature complexes on this tracing are ventricular in origin. What is the most complex grouping of consecutive ventricular beats present?

Couplets - two consecutive VPCs

Triplets - three consecutive VPCs

Singlets - one VPC at a time

A run - four or more consecutive VPCs

Dog - American Bulldog (Recorded with Beecardia)

7 years • Male • Recording obtained standing, before any antiarrhythmic treatment

Question

How would you classify the arrhythmia on this tracing?

Ventricular tachycardia

Frequent ventricular premature complexes

Accelerated idioventricular rhythm

Supraventricular tachycardia with aberrant conduction

Dog - Golden Retriever (Recorded with Beecardia)

10 years • Female • Recent splenectomy and gastropexy

Question

The ectopic complexes in this tracing are ventricular in origin. Which classification best fits this ventricular rhythm?

Ventricular tachycardia

Ventricular escape rhythm

Frequent ventricular premature complexes

Accelerated idioventricular rhythm

Dog - Labrador (Recorded with Beecardia)

10 years • Male

Question

This tracing shows several ventricular premature complexes. Based on how the ectopic beats look, what does their morphology suggest about the origin of the ventricular ectopy?

Uniform VPCs, suggesting a single ventricular focus or activation path

Multiform VPCs, suggesting more than one ventricular focus or activation path

Supraventricular premature complexes conducted with aberrancy

Fusion beats blending sinus and ventricular activation

Dog - Hound Mix (Recorded with Beecardia)

15 years • Female • A grade 2/6 murmur noted on examination

Question

Which option best describes the clinical significance of the ventricular ectopy on this tracing?

A single incidental premature beat whose rarity makes further evaluation unnecessary

A sustained run of ventricular tachycardia that makes this immediately life-threatening

Frequent single, predominantly monomorphic ectopy whose significance rests on burden rather than complexity

Multiform ectopy grouped into couplets, whose significance rests on high-risk complexity

Quiz: Ventricular Arrhythmias

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Quiz: Ventricular Arrhythmias

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