Association between EMS response time and return of spontaneous circulation in out-of-hospital cardiac arrest patients in Busan, South Korea - 23/04/26
Abstract |
Objectives |
This study evaluated the impact of response time on prehospital return of spontaneous circulation (ROSC) in out-of-hospital cardiac arrest (OHCA) patients in Busan, South Korea.
Methods |
We analyzed OHCA cases from Busan Fire and Disaster Headquarters (January–December 2022). A total of 2388 patients aged ≥18 years with complete EMS records were included. After excluding response time groups with <30 observations, 2268 cases were analyzed using SAS 9.4 for multiple logistic regression.
Results |
Among 2388 OHCA patients in Busan, 179 (7.5 %) achieved ROSC. Only 2.5 % of cases met the 4-min response time benchmark. Multiple logistic regression identified key factors associated with higher ROSC: younger age (OR = 3.650 for 18–60 years vs. oldest group), witnessed arrest (OR = 2.788), shockable rhythm (OR = 3.105), bystander CPR (OR = 1.881), and EMS defibrillation (OR = 4.554). Response time showed the strongest association at <4 min (OR = 2.812), declining progressively at 5 min (OR = 1.748), 6 min (OR = 1.339), and 7 min (OR = 1.146).
Conclusions |
Shorter response times were associated with increased ROSC rates in OHCA patients. This highlights the need for policy measures to reduce response times, including community-based early recognition systems and optimized emergency resource allocation.
Il testo completo di questo articolo è disponibile in PDF.Highlights |
• | Among 2388 patients with OHCA in Busan, South Korea, 179 (7.5 %) achieved ROSC. |
• | Most arrests were unwitnessed (53.7 %), occurred in nonpublic locations (78.9 %), and presented with non-shockable rhythms (89.1 %). Bystander CPR was provided in 53.1 % of cases, whereas bystander AED use was rare (0.4 %). |
• | Most cases failed to meet response time thresholds of 3–7 min. |
• | After adjusting for key patient and treatment characteristics, the adjusted odds ratios for achieving ROSC progressively declined as the EMS response time threshold increased. |
• | Specifically, significantly higher odds of ROSC were observed when the response time was under 4 min (aOR = 2.812, 95 % CI: 1.116–6.561) and under 5 min (aOR = 1.748, 95 % CI: 1.038–2.870). |
Keywords : Out-of-hospital cardiac arrest, Emergency medical services, Response time, Resuscitation, Return of spontaneous circulation
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Vol 104
P. 172-180 - giugno 2026 Ritorno al numero
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