Objective:To preliminarily explore the stability of electrical parameters after leadless pacemaker implantation in elderly patients and evaluate the efficacy and safety of leadless pacemakers in clinical application.Methods:This study was a retrospective and observational research.Fifty-two patients aged≥70 years who re-ceived single or dual chamber leadless pacemaker implantation in Shanghai Fengxian District Central Hospital and Shanghai Putuo District Liqun Hospital from August 2021 to February 2023 were selected.The basic characteris-tics and perioperative data were collected.The parameters of leadless pacemaker(R-wave,threshold,imped-ance),echocardiography,brain natriuretic peptide(BNP),and creatinine were followed up after implantation.The complications and serious adverse events were also recorded.Results:Fifty-two patients completed pacemaker implantation with a success rate of 100％.The intraoperative mean ventricular pacing threshold was(0.53±0.24)V at 0.24 ms,the leadless pacemaker R-wave was(11.67±4.65)mV,impedance was(831.88±194.82)Ω,op-eration time was(39.41±19.54)min,and hospital stay was(9.25±3.72)d.There was no perioperative air thromboembolism,cardiac perforation,pericardial tamponade,pacemaker falling off,or shifts.The tricuspid valve function showed no significant change under echocardiography one month after implantation.The electrical parameters 6 months after implantation:mean ventricular pacing threshold was(0.48±0.10)V at 0.24 ms,lead-less pacemaker R-wave was(13.38±3.89)mV,impedance was(716.88±141.23)Ω,and ventricular pacing was 54.1％.Compared with intraoperative values,there was no significant change in the leadless pacemaker R-wave or threshold,while the impedance showed a decreasing trend(P＜0.05).Conclusion:For elderly patients,leadless pacemaker implantation has stable electrical parameters during and after the implantation,with the low incidence of complications.It is safe and effective in clinical applications.
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