Termination of tachycardias by interrupting blood flow to the arrhythmogenic area

Area of Science:

• Cardiology
• Electrophysiology
• Interventional Cardiology

Background:

• Tachycardias, including ventricular tachycardia, Wolff-Parkinson-White syndrome, and atrial tachycardia, pose significant clinical challenges.
• Current treatment strategies for refractory tachycardias often involve invasive procedures or medications with potential side effects.

Purpose of the Study:

• To investigate the feasibility of interrupting tachycardias by inducing localized ischemia or hypothermia in the arrhythmogenic area or pathway.
• To evaluate a novel catheter-based approach targeting the coronary artery supply to the arrhythmia source.

Main Methods:

• Subselective catheterization of coronary arteries supplying the origin of ventricular tachycardia (VT), accessory pathways, or atrial tachycardia (AT).
• Induction of ischemia via arterial occlusion or localized cooling using iced saline.
• Assessment of arrhythmia termination and prevention of reinduction.

Main Results:

• Successful and reproducible termination of ventricular tachycardia in 8 out of 9 patients.
• Temporary prevention of VT reinduction in the majority of treated patients.
• Termination of accessory pathway-mediated tachycardia in 1 patient and AV nodal reentrant tachycardia in another.
• Successful termination of a continuous atrial tachycardia through targeted cooling.

Conclusions:

• Demonstrates the feasibility of identifying and selectively catheterizing coronary arteries supplying arrhythmogenic foci.
• Presents a potential new therapeutic strategy for tachycardias by permanently ablating the blood supply to the arrhythmia source.
• Highlights the potential for localized ischemia or cooling as a treatment modality for complex cardiac arrhythmias.