A case of atrial tachycardia treated with ivabradine as bridge to ablation

Area of Science:

• Cardiology
• Electrophysiology
• Pharmacology

Background:

• Ivabradine inhibits the If current in the sinoatrial node, primarily indicated for cardiac failure and ischemia to reduce sinus rate.
• Supraventricular tachyarrhythmias (SVTs) can be challenging to manage, often requiring multiple antiarrhythmic drugs or interventions.
• Refractory tachyarrhythmias necessitate exploration of alternative therapeutic agents and strategies.

Observation:

• A case study involving an 18-year-old female patient with left atrial tachyarrhythmia resistant to conventional treatments is presented.
• The patient exhibited significant heart rate reduction upon administration of ivabradine, although the tachyarrhythmia persisted.
• An ectopic focus originating from the left pulmonary vein ostium was identified as the source of the arrhythmia.

Findings:

• Ivabradine demonstrated efficacy in controlling the heart rate associated with the left atrial tachyarrhythmia.
• The drug's effect was primarily rate-slowing, without direct antiarrhythmic properties in this specific case.
• Successful ablation of the pulmonary vein ectopic focus resolved the tachyarrhythmia post-ivabradine treatment.

Implications:

• Ivabradine may serve as a valuable adjunctive therapy for managing supraventricular tachyarrhythmias driven by enhanced automaticity.
• This case highlights the potential utility of ivabradine in heart rate control for specific refractory tachyarrhythmias.
• Further research into ivabradine's role in diverse tachyarrhythmia mechanisms is warranted.