Use of biphasic electrical cardioversion for treatment of idiopathic atrial fibrillation in two horses.

The study investigates the use of biphasic electrical cardioversion as a treatment method for idiopathic atrial fibrillation in horses, presenting an alternative to the conventional pharmacological treatment.

Experiment Overview

• The researchers conducted an experiment involving two horses suffering from idiopathic sustained atrial fibrillation which is a type of heart arrhythmia.
• The horses were treated with rectilinear biphasic cardioversion where one horse successfully converted to sustained sinus rhythm, which is the normal regular rhythm of the heart.

Variables

• Several factors were suggested that could influence the outcome of the electrical cardioversion procedures in horses. These include the duration of the arrhythmia, positioning of the cardioverter pads and paddles, serum electrolyte concentrations, and the use of quinidine treatment.
• Quinidine is a medication typically used to treat arrhythmias in horses. The comparison of the effects of this traditional treatment to the new method was one of the key points of this study.

Assessment of Myocardium Health

• The health of the horses’ myocardium—the muscular tissue of the heart—after electrical shocks was assessed through measuring serum cardiac troponin I concentrations. This biochemical marker is often used to detect heart muscle injury.
• Despite the electrical cardioversion procedure, the levels of cardiac troponin I was within the normal range for both horses, suggesting that their heart muscles were not damaged by the shocks.

Advantages of Biphasic Cardioversion

• The findings of the study suggest that biphasic electrical cardioversion might serve as a feasible alternative to pharmacologic cardioversion with quinidine in horses.
• In addition to being potentially safer and more effective than traditional monophasic cardioversion, the rectilinear biphasic defibrillator-cardioverter delivers a constant current to the myocardium regardless of transthoracic impedance, allowing for a more controlled treatment process.

This research indicates that biphasic cardioversion might offer advantages in the treatment of idiopathic atrial fibrillation in horses. However, further research and larger sample sizes are needed to confirm these findings and fully examine the potential variables affecting the success of the procedure.