A Comparison of Efficacy between Atrial Pacing and Dual-Chamber Pacing in Patients with Slow-fast Syndrome

Objective:To evaluate retrospectively the treatmeat effects on slow-fast syndrome using AAI and DDD pacing.Methods:Thirty-four patients with sick-sinus syndrome underwent cardiac pacing therapy,including 16 patients with AAI pacing and 18,with DDD pacing from January of 1997 to December of 2005.After pacemaker implantation,follow-up candiac function and incidence of persistant atrical fibrillation were obained.Results:During follow-up of 6.8±2.5 years,there were no significant changes (P0.05) in cardiac systolic function before and after pacing treatment in both patient groups,either using AAI (Left ventricular ejection fraction 57.1%±6.4% pre-versus 61.2%±8.1% post-treatment) or DDD (57.3%±4.3% pre-versus 58.7%±6.5% post).There was significant difference (P0.05) for the incidence of persistant atrial fibrillation in AAI patient group (2 of 16 cases,12.5%) versus (6 of 18 cases,33.3%) in DDD patient group.Conclusion:Pacing treatment of sinus-node syndrome either using AAI or DDD is effective.Preliminary findings indicate that an incidence of persistant atrial fibrillation is observed lower in AAI patient group as compared to that in DDD patient group.