Background:The appropriate duration of prehospital cardiopulmonary resuscitation (CPR) administered by emergency medical service (EMS) providers for patients with out-of-hospital cardiac arrest (OHCA) necessary to achieve 1-month survival with favorable neurological outcome (Cerebral Performance Category 1 or 2, CPC 1-2) is unclear and could differ by age.
Methods and Results:We analyzed the records of 35,709 adult OHCA patients with return of spontaneous circulation (ROSC) before hospital arrival in a prospectively recorded Japanese registry between 2011 and 2014. The CPR duration was defined as the time from CPR initiation by EMS providers to prehospital ROSC. The rate of 1-month CPC 1-2 was 21.4% (7,650/35,709). The CPR duration was independently and inversely associated with 1-month CPC 1-2 (adjusted odds ratio, 0.93 per 1-min increment; 95% confidence interval, 0.93-0.94). The CPR duration increased with age (P<0.001). However, the CPR duration beyond which the proportion of OHCA patients with 1-month CPC 1-2 decreased to <1% declined with age: 28 min for patients aged 18-64 years, 25 min for 65-74 years, 23 min for 75-84 years, 20 min for 85-94 years, and 18 min for ≥95 years.
Conclusions:In patients who achieved prehospital ROSC after OHCA, the duration of CPR administered by EMS providers necessary to achieve 1-month CPC 1-2 varied by age.Key Words: Aging; Cardiopulmonary resuscitation; Epidemiology; Out-of-hospital cardiac arrest
ORIGINAL ARTICLE Arrhythmia/ElectrophysiologyCirculation Journal Vol.81, May 2017 653 CPR Duration and Outcomes After OHCA by Age crew consists of 3 EMS staff members, including at least 1 emergency lifesaving technician (ELST). ELSTs are allowed to use various resuscitation methods, including for whom resuscitation was attempted after OHCA in Japan between January 2011 and December 2014. Some data from this patient cohort from January 2011 to December 2012 have been reported as part of other analyses investigating the relationship between CPR duration and initial documented rhythm. 6 Cardiac arrest was defined as the cessation of cardiac mechanical activity as confirmed by the absence of signs of circulation. The cause of arrest was presumed to be cardiac unless evidence suggested an external cause, respiratory disease, cerebrovascular disease, malignant tumor, or any other noncardiac cause. Physicians in charge made the determination of the cause of arrest in collaboration with EMS providers.This study was approved by the Ethics Committee of Kanazawa University with a waiver of informed consent because of the anonymous nature of the data.
The Japanese EMS SystemJapan has approximately 127 million residents in an area of 378,000 km 2 . Details of the Japanese EMS system have been described previously. 13 The FDMA of Japan supervises the national EMS system. Each local EMS system is operated by the local fire station. In general, an ambulance whether ROSC was achieved before arrival at the hospital, time of the emergency call, time of vehicle arrival at the scene, time of CPR ...