• Tae Han Kim, Youdong Sohn, Wonpyo Hong, Kyoung Jun Song, and Sang Do Shin.
• Department of Emergency Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, South Korea; Laboratory of Emergency Medical Services, Seoul National University Hospital Biomedical Research Institute, South Korea. Electronic address: adoong2001@gmail.com.
• Resuscitation. 2020 Aug 1; 153: 136-142.

ObjectivesCardiac arrest recognition, ambulance dispatch and dispatcher-assisted cardiopulmonary resuscitation (DA-CPR) by emergency medical dispatch (EMD) are crucial for an optimal outcome of out-of-hospital cardiac arrest (OHCA). In EMD, crowding is caused by a mismatch between the number of emergency calls and the number of dispatchers available per shift. Crowding in the emergency department has been shown to decrease performance and outcomes; however, little is known about the effect of crowding in EMD. We aimed to evaluate the incidence of crowding in the EMD and the effect of emergency call crowding on dispatcher-assisted CPR instruction performance in OHCA calls.MethodsWe used a nationwide OHCA database from 2013 to 2016 consisting of patients with the presumed cardiac origin who were dispatched by Seoul EMD. The main exposure was an hourly number of total incoming emergency calls to EMD. The number of hourly calls was categorized into quartiles (≤40 calls, 41-51 calls, 52-61 calls and ≥62 calls). The primary outcome was successful DA-CPR instruction provision within 120 s. Adjusted odds ratios (AORs) and 95% confidence intervals (CIs) were estimated to evaluate the association between EMD crowding and outcomes in the multivariable logistic regression model.ResultsOf a total of 12,722 patients, the proportion of successful DA instruction was highest in the least-crowded quartile and lowest in the most-crowded quartile (22.7% vs. 15.0%, p < 0.01). The adjusted odds ratio was 0.85 (95% CI 0.74-0.98) in the most-crowded EMD quartile, with a lower proportion of DA instruction within 120 s. Crowding in quartile 4 and quartile 3 was associated with a less favorable neurological outcome in the multivariable logistic regression model (AOR (95% CI) 0.78 (0.60-0.99) and 0.70 (0.54-0.91), respectively).ConclusionCrowding in emergency medicine dispatch caused by increased hourly call volume was associated with delayed dispatcher-assisted CPR instruction provision. Medical directors might consider a strategic approach to addressing crowding in EMD according to the crowding distribution.Copyright © 2020 Elsevier B.V. All rights reserved.

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