Dual chamber sequential pacing management of sinus node dysfunction: advantages over single-chamber pacing

Area of Science:

• Cardiology
• Biomedical Engineering
• Electrophysiology

Background:

• Sinus node dysfunction (SND) is a common indication for pacemaker implantation.
• Ventricular demand (VVI) pacing has been a standard treatment, but may not fully address all SND symptoms.
• Atrioventricular sequential (DVI) pacing aims to restore more physiological cardiac activation.

Purpose of the Study:

• To compare the efficacy of DVI pacing versus VVI pacing in managing symptoms associated with SND.
• To evaluate the impact of each pacing mode on symptom density and specific symptoms like syncope.

Main Methods:

• A comparative study involving 69 patients with DVI pacemakers and 67 patients with VVI pacemakers.
• Assessment of symptom incidence and symptom density before and after pacemaker implantation.
• Analysis of specific symptoms, including syncope, and electrode-related complications.

Main Results:

• Both DVI and VVI pacing effectively controlled syncope.
• DVI pacing demonstrated significantly greater improvement in overall symptoms compared to VVI pacing (p < 0.000).
• Symptom density decreased from 3.3 to 0.43 in the DVI group, versus 3.2 to 1.75 in the VVI group.
• Electrode issues were noted in 7.3% of DVI patients (atrial electrode) and 0.74% of VVI patients (ventricular electrode repositioning).

Conclusions:

• DVI pacing is superior to VVI pacing for comprehensive symptom management in patients with sinus node dysfunction.
• While both pacing modes control syncope, DVI offers broader symptomatic relief.
• Careful monitoring for potential atrial electrode complications is warranted with DVI pacing.