[Experiences with a new transvenous electrode for left ventricular stimulation].

Area of Science:

• Cardiology
• Medical Devices
• Heart Failure Management

Background:

• Left ventricular and biventricular pacing are emerging therapies for select chronic heart failure patients.
• Traditional epicardial pacing requires thoracotomy, posing surgical risks.
• A novel transvenous electrode for left epicardial pacing via coronary sinus tributaries is evaluated.

Purpose of the Study:

• To assess the safety and efficacy of a new transvenous electrode for left ventricular pacing.
• To evaluate lead placement success rates using a novel guiding catheter and electrode system.
• To compare this new approach with traditional epicardial pacing methods.

Main Methods:

• Implantation of dual-chamber pacemakers/defibrillators with a new left ventricular pacing lead (CPI Easytrak-lead) in coronary veins.
• Lead placement via subclavian vein access and a preformed guiding catheter for coronary sinus insertion.
• Inclusion criteria: NYHA class II heart failure, QRS duration >120 ms, LVEF <35%.

Main Results:

• Successful left ventricular lead implantation in 81% of patients (13/16) into coronary veins.
• Lead insertion failure in 2 patients (12.5%) due to significant cardiomegaly and right atrial enlargement.
• One patient experienced unacceptable high pacing thresholds intraoperatively; no complications or lead dysfunctions reported during mean follow-up of 142 days.

Conclusions:

• The novel transvenous approach for left ventricular pacing is safe and well-tolerated.
• This technique, utilizing a new guiding catheter and electrode, demonstrates a higher success rate than previous methods.
• Left epicardial lead placement via the transvenous over-the-wire technique offers a potentially more efficient alternative to thoracotomy-based pacing.