{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,19]],"date-time":"2026-02-19T03:34:09Z","timestamp":1771472049810,"version":"3.50.1"},"reference-count":23,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2021,8,25]],"date-time":"2021-08-25T00:00:00Z","timestamp":1629849600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JCM"],"abstract":"<jats:p>Background: The wearable cardioverter defibrillator (WCD) uses surface electrodes to detect arrhythmia before initiating a treatment sequence. However, it is also prone to inappropriate detection due to artefacts. Objective: The aim of this study is to assess the alarm burden in patients and its impact on clinical outcomes. Methods: Patients from the nationwide Swiss WCD Registry were included. Clinical characteristics and data were obtained from the WCDs. Arrhythmia recordings \u226530 s in length were analysed and categorized as VT\/VF, atrial fibrillation (AF), supraventricular tachycardia (SVT) or artefact. Results: A total of 10653 device alarms were documented in 324 of 456 patients (71.1%) over a mean WCD wear-time of 2.0 \u00b1 1.6 months. Episode duration was 30 s or more in 2996 alarms (28.2%). One hundred and eleven (3.7%) were VT\/VF episodes. The remaining recordings were inappropriate detections (2736 (91%) due to artefacts; 117 (3.7%) AF; 48 (1.6%) SVT). Two-hundred and seven patients (45%) had three or more alarms per month. Obesity was significantly associated with three or more alarms per month (p = 0.01, 27.7% vs. 15.9%). High alarm burden was not associated with a lower average daily wear time (20.8 h vs. 20.7 h, p = 0.785) or a decreased implantable cardioverter defibrillator implantation rate after stopping WCD use (48% vs. 47.3%, p = 0.156). Conclusions: In patients using WCDs, alarms emitted by the device and impending inappropriate shocks were frequent and most commonly caused by artefacts. A high alarm burden was associated with obesity but did not lead to a decreased adherence.<\/jats:p>","DOI":"10.3390\/jcm10173811","type":"journal-article","created":{"date-parts":[[2021,8,26]],"date-time":"2021-08-26T00:19:26Z","timestamp":1629937166000},"page":"3811","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["High Incidence of Inappropriate Alarms in Patients with Wearable Cardioverter-Defibrillators: Findings from the Swiss WCD Registry"],"prefix":"10.3390","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7972-5199","authenticated-orcid":false,"given":"Boldizsar","family":"Kovacs","sequence":"first","affiliation":[{"name":"Department of Cardiology, University Heart Center Zurich, R\u00e4mistrasse 100, 8091 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Haran","family":"Burri","sequence":"additional","affiliation":[{"name":"Department of Cardiology, University Hospital of Geneva, 1205 Geneva, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andres","family":"Buehler","sequence":"additional","affiliation":[{"name":"Department of Cardiology, University Heart Center Zurich, R\u00e4mistrasse 100, 8091 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sven","family":"Reek","sequence":"additional","affiliation":[{"name":"Hirslanden Klinik Aarau, 5001 Aarau, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8428-7050","authenticated-orcid":false,"given":"Christian","family":"Sticherling","sequence":"additional","affiliation":[{"name":"Department of Cardiology, University Hospital Basel, 4031 Basel, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Beat","family":"Schaer","sequence":"additional","affiliation":[{"name":"Department of Cardiology, University Hospital Basel, 4031 Basel, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andre","family":"Linka","sequence":"additional","affiliation":[{"name":"Department of Cardiology, Cantonal Hospital Winterthur, 8400 Winterthur, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peter","family":"Ammann","sequence":"additional","affiliation":[{"name":"Department of Cardiology, Cantonal Hospital St. Gallen, 9007 St. Gallen, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andreas S.","family":"M\u00fcller","sequence":"additional","affiliation":[{"name":"Department of Cardiology, Triemli Hospital Zurich, 8063 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7910-5152","authenticated-orcid":false,"given":"Omer","family":"Dzemali","sequence":"additional","affiliation":[{"name":"Department of Cardiac Surgery, Triemli Hospital Zurich, 8063 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3988-7262","authenticated-orcid":false,"given":"Richard","family":"Kobza","sequence":"additional","affiliation":[{"name":"Department of Cardiology, Cantonal Hospital Lucerne, 6004 Lucerne, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Matthias","family":"Schindler","sequence":"additional","affiliation":[{"name":"Department of Cardiology, University Heart Center Zurich, R\u00e4mistrasse 100, 8091 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laurent","family":"Haegeli","sequence":"additional","affiliation":[{"name":"Department of Cardiology, Cantonal Hospital Aarau, 5001 Aarau, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kurt","family":"Mayer","sequence":"additional","affiliation":[{"name":"Department of Cardiology, Cantonal Hospital Graub\u00fcnden, 7000 Chur, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Urs","family":"Eriksson","sequence":"additional","affiliation":[{"name":"Department of Cardiology, GZO Regional Healthcare Center Wetzikon, 8620 Wetzikon, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6881-3073","authenticated-orcid":false,"given":"Claudia","family":"Herrera-Siklody","sequence":"additional","affiliation":[{"name":"Department of Cardiology, University Hospital Lausanne, 1011 Lausanne, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7197-8415","authenticated-orcid":false,"given":"Tobias","family":"Reichlin","sequence":"additional","affiliation":[{"name":"Department of Cardiology, Inselspital, University Hospital Bern, University of Bern, 3010 Bern, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jan","family":"Steffel","sequence":"additional","affiliation":[{"name":"Department of Cardiology, University Heart Center Zurich, R\u00e4mistrasse 100, 8091 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1896-0803","authenticated-orcid":false,"given":"Ardan M.","family":"Saguner","sequence":"additional","affiliation":[{"name":"Department of Cardiology, University Heart Center Zurich, R\u00e4mistrasse 100, 8091 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4748-0158","authenticated-orcid":false,"given":"Firat","family":"Duru","sequence":"additional","affiliation":[{"name":"Department of Cardiology, University Heart Center Zurich, R\u00e4mistrasse 100, 8091 Zurich, Switzerland"},{"name":"Center for Integrative Human Physiology, University of Zurich, 8006 Zurich, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,8,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2275","DOI":"10.1056\/NEJMoa1211107","article-title":"Reduction in Inappropriate Therapy and Mortality through ICD Programming","volume":"367","author":"Moss","year":"2012","journal-title":"N. 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