Temporary transvenous cardioversion and defibrillation: a new method for practical tachyarrhythmia management

Area of Science:

• Cardiovascular Electrophysiology
• Medical Device Technology

Background:

• Transthoracic defibrillation remains standard for emergent arrhythmias despite advances in transvenous implantable cardioverter-defibrillators (ICDs) and atrial defibrillation.
• High energy transthoracic shocks are commonly used for patients without devices experiencing ventricular tachycardia (VT) or ventricular fibrillation (VF).

Purpose of the Study:

• To describe the evolution of temporary internal defibrillation techniques.
• To report initial clinical outcomes of a novel disposable catheter for internal cardioversion and defibrillation.

Main Methods:

• A custom-built disposable catheter prototype was developed for internal cardioversion and defibrillation.
• The prototype was tested in 28 patients, delivering shocks for 109 episodes of VT or VF.
• A newer catheter design incorporating 40-wire Matrix technology was evaluated for its defibrillating electrode properties.

Main Results:

• The prototype catheter successfully converted over 95% of VT/VF episodes.
• Effective conversion was achieved using biphasic energies of 20 Joules (J) or less.
• The Matrix technology catheter features a high surface area, low impedance, and low current density.

Conclusions:

• Temporary internal cardioversion-defibrillation using novel disposable catheter designs is highly effective.
• This technology demonstrates potential for broad application in electrophysiology procedures.
• The catheters are suitable for critical care units managing patients at risk for tachyarrhythmias.