Outcomes of Patients Who Have Incidental Non-Sustained Ventricular Tachycardia Identified on Cardiac Implantable Electronic Device Interrogation

Background: Non-sustained ventricular tachycardia (NSVT) is an arrhythmia prevalent in both structurally normal and abnormal hearts. Methods: We conducted a single-center retrospective clinical audit of patients followed-up in a device clinic with one or more incidental NSVT episodes recorded on their device between November 2017 and August 2018 and followed up patients for outcomes until January 2019. Results: A total of 83 patients were included in the analysis with one or more episodes of NSVT on device interrogation. Those identified to have NSVT were more likely to be male (74.7%) and there was a mean of 14.2 beats per episode and a mean of 3.7 episodes for each patient. Only 24.7% of patients had electrolytes checked within 4 weeks of episode detection and 18.3% had an echocardiogram post-episode. The majority of patients (73.5%) were followed up again in the pacing clinic but had no changes in medication, or other management implemented. In terms of outcomes, 81.7% of patients had no admission to hospital, mortality, or shock during the follow-up period. Conclusions: Most patients who developed NSVT did not have an extra follow-up, medication review, or investigation. Despite this, outcomes such as admission, shock, or death were uncommon.