Abstract
The safety and efficacy of the leadless pacemaker (LP) have been confirmed in previous reports, yet studies on LPs in superelderly patients are limited. A total of 62 patients aged over 85 years old were implanted with single-chamber pacemakers due to symptomatic bradyarrhythmia at Sakakibara Heart Institute from May 2014 through July 2019. We divided them into two groups, a transvenous (TV) single-chamber pacemaker group (35 patients) and an LP group (27 patients), and compared the groups. Mean participant age was 90.3 ± 3.8 y.o., 41.9% were male, and mean participant body mass index (BMI) was 21.3kg/m2 . The LP group contained a significantly larger proportion of patients with dementia than the TV group did (63%vs. 37.1%, P=.04). The complication-free rate tended to be lower in the LP group in spite of the higher frequency of dementia (88.6%vs. 92.6%, P=.68). At implantation, the pacing threshold was significantly higher in the LP group than in the TV group (1.30 ± 0.91 V vs. 0.71 ± 0.23 V, P<.01), but over the first 3 months after the operation the pacing threshold in the LP group gradually improved (0.82 ± 0.2 V vs. 1.05 ± 1.02 V, P=.16). The procedure time and time from operation to discharge were also shorter in the LP group. LP implantation appears to be safe and is accordingly becoming the cornerstone for Japanese superelderly patients indicated for single-chamber pacemakers, even for those with small bodies and dementia. However, careful procedures and long follow-ups are needed until a greater volume of data is reported.
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