Efficacy of Ventricular Capture Management in Patients with Single or Dual Chamber Pacemakers

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Introduction: Medtronic Ventricular Capture Management (VCM) allows effective long-term management of the pacing output and thus, maximises battery longevity. The aim of this study is to determine the accuracy of the VCM and results were comparable with in-office manual threshold results (MTR). Method: Patients with bradyarrhythmia indications who received a Medtronic device with VCM were recruited. Clinical demographics were collected and analysed. The VCM data was analysed and compared with in-office MTR. VCM was turned on only 3 months after implantation. Results: There were 30 patients (13 male, 17 female) of mean age 71 years old. 13% received single chamber pacemaker. The mean duration of initial implantation was 2.5 years. 14 patients (46.7%) had identical VCM threshold results and in-office MTR. 15 patients (50%) had+0.25 V difference between VCM threshold results and in-office MTR. Only 1 patient (3.3%) was shown to have 0.5 V difference between VCM threshold results (1.125 V @ 0.4 ms) and in-office MTR (0.625 V @ 0.4 ms). Conclusion: VCM is considered to be accurate and comparable to in-office manual threshold tests at least 3 months after device implantation. VCM reliability will allow proper management of the pacing output by adjusting accordingly to the threshold obtained automatically.