Abstract 19507: Outcome of In-Hospital VT/VF Arrest by Time and Location When Using a Wearable Cardioverter Defibrillator
Introduction: Previous studies have shown that survival following an in-hospital sudden cardiac arrest (SCA) is worse during nighttime hours or on weekends, or in non-monitored areas. The wearable cardioverter defibrillator (WCD) automatically detects and treats lethal ventricular tachyarrhythmias (VT/VF) without hospital staff’s intervention. This study assessed the time- and location-dependent outcome of in-hospital shockable SCA events when using a WCD.
Methods: We retrospectively reviewed in-hospital shockable SCA events (01/2011-05/2015) experienced by patients using a WCD. All data were retrieved from the manufacturer’s registry. The index shockable SCA event was defined as the first arrest caused by VT/VF, if a patient had more than 1 arrest during the same hospitalization. Daytime was defined as 7:00AM-7:00PM and nighttime as 7:01PM-6:59AM. Initial arrhythmias and shock conversion were analyzed from the device-stored ECGs. Event locations and clinical outcomes were extracted from patient call logs. Survival analysis was performed using the Kaplan-Meier (KM) method. Chi-square or Fisher’s exact test were used to test categorical variables. A 2-sided p value of 0.05 was considered to be statistically significant.
Results: A total of 234 in-hospital shockable SCA events (65±12 years, 74% male) were included in the final analysis. Shock conversion and 24-hour survival were similar for events occurring in the daytime compared with nighttime (91% vs. 89%), on the weekend compared with weekday (92% vs. 89%), and by location (Table). The average follow-up time after the index event was 52 ±127 days. KM analyses revealed that 30-day survival was similar between weekend and weekday events (72% vs. 65%, p=0.79) and between daytime and nighttime events (65% vs. 68%, p=0.29).
Conclusions: WCD therapy during in-hospital VT/VF arrest resulted in high shock conversion success and survival regardless of time of day, day of week, or location.
Author Disclosures: C. Wan: Employment; Significant; ZOLL. S.J. Szymkiewicz: Employment; Significant; ZOLL.
- © 2016 by American Heart Association, Inc.