Cardiac Arrhythmias in Horses

Area of Science:

• Veterinary Cardiology
• Equine Medicine

Background:

• Arrhythmias are frequently observed in horses.
• Physiologic arrhythmias like sinus arrhythmia and atrioventricular block typically resolve with exercise.

Purpose of the Study:

• To review common equine arrhythmias.
• To discuss their clinical significance and management.

Main Methods:

• Literature review of equine cardiac arrhythmias.
• Clinical case analysis (implied).

Main Results:

• Sinus arrhythmia and AV block are common but usually benign.
• Atrial premature depolarizations can trigger atrial fibrillation, risking collapse.
• Atrial fibrillation is treatable with quinidine sulfate or electrical cardioversion.
• Ventricular premature depolarizations may portend ventricular tachycardia/fibrillation, especially with heart disease.

Conclusions:

• Understanding equine arrhythmias is crucial for diagnosis and treatment.
• Prompt identification and management of significant arrhythmias improve prognosis.
• Certain arrhythmias require intervention to prevent serious outcomes.