Clinical follow-up of dual-chamber pacemaker with atrioventricular search function

AIM: To observe the efficacy of reducing ventricular pacing, the long-term changes of pacing parameters and the safety of dual-chamber pacemakers with atrioventricular interval automatic search function (AV search function). METHODS: A 6-month follow-up was conducted in 86 patients implanted with two types of DDD/R pacemakers (40 cases with AV search, 46 cases with non-AV search). RESULTS: Compared with that in patients in non-AV search DDD/R group, ventricular pacing decreased significantly in patients implanted with AV search pacemakers 1, 3 and 6 months after implantation ［(20±6)% vs.(78±12)%, (18±7)% vs.(73±9)%, (19±5)% vs.(76±9)%, P<0.05］. No significant difference was observed in pacing parameters and cardiac functions between the two groups and no AV search problems occurred during the follow-up. CONCLUSION: DDD/R with AV search is safe and can reduce unnecessary ventricular pacing.