Sequential biventricular pacing: evaluation of safety and efficacy

Area of Science:

• Cardiology
• Biomedical Engineering
• Medical Devices

Background:

• Systolic heart failure with prolonged QRS complex duration often requires advanced pacing solutions.
• Biventricular pacing aims to resynchronize ventricular contraction, improving cardiac function.
• Optimizing pacing parameters is crucial for maximizing therapeutic benefits.

Purpose of the Study:

• To evaluate the clinical safety, performance, and efficacy of the InSync III biventricular stimulator.
• To assess the impact of sequential biventricular pacing on heart failure patients.
• To determine optimal programming of sequential biventricular pacing features.

Main Methods:

• A multicenter, prospective 3-month study involving 198 patients with symptomatic systolic heart failure.
• Implantation of the InSync III (Model 8042) biventricular stimulator.
• Assessment of clinical endpoints including 6-minute hall walk distance, NYHA class, and echocardiographic parameters (stroke volume).

Main Results:

• Successful implantation in 95.9% of patients.
• Significant improvements in 6-minute hall walk distance (422m vs 339m) and NYHA class (1.9 vs 3.1).
• Sequential pacing improved stroke volume (68mL vs 56mL) within specific V-V delay ranges (+/- 40ms).

Conclusions:

• Sequential biventricular pacing with the InSync III device is safe and efficacious for heart failure patients.
• Optimized sequential pacing significantly enhances stroke volume compared to simultaneous pacing.
• The device functioned as expected with manageable lead-related complications and acceptable survival rates.