RT Journal Article SR Electronic T1 Comparison of the Outcome of Patients Protected by the Wearable Cardioverter Defibrillator (WCD) for <90 Wear Days versus ≥90 Wear Days JF In Vivo JO In Vivo FD International Institute of Anticancer Research SP 3601 OP 3610 DO 10.21873/invivo.12205 VO 34 IS 6 A1 TOBIAS C. DREHER A1 IBRAHIM EL-BATTRAWY A1 SUSANNE RÖGER A1 STEPHANIE L. ROSENKAIMER A1 STEFAN GERHARDS A1 JÜRGEN KUSCHYK A1 MARTIN BORGGREFE A1 IBRAHIM AKIN YR 2020 UL http://iv.iiarjournals.org/content/34/6/3601.abstract AB Background/Aim: The wearable cardioverter/defibrillator (WCD) is recommended to prevent sudden cardiac death (SCD). Guidelines suggest a 90 days' period, but prolongation of WCD wear time until increasing the ejection fraction (≥35%) might be suggested. Patients and Methods: A cohort of 153 patients with prescribed WCD were divided into two groups: A <90 wear days' group (n=112) vs. ≥90 wear days' group (n=41) and followed. Results: In the first group, WCD shock occurred in 3.6% of patients, 47.3% improved in left ventricular ejection fraction (LVEF) after 3 months, and 37.5% had a cardiac implantable electronic device (CIED) implantation with appropriate implantable cardioverter defibrillator (ICD) shock events occurring in 6 patients. Two of these patients already received WCD shock therapy due to ventricular fibrillation. A 20.5% improved in LVEF after 6-12 months, but 73% were already implanted with ICD. In the second group, 4.9% received WCD shock, 34.1% improved in LVEF after 3 months, 48.8% were implanted with ICD, and 2 had ICD shocks during follow up time. LVEF improvement after 6-12 months occurred in 26.8%. ICD implantation was prevented in 7.3% of patients due to LVEF recovery. Conclusion: Prolonging wearing days of WCD may reduce the number of inappropriate ICD implantation.