Response interval is important for survival until admission after prehospital cardiac arrest.
BACKGROUND
An increasing distance to the nearest hospital must be expected as a result of centralization of acute care at a small number of hospitals. This may have important consequences in emergency situations, such as prehospital or out-of-hospital cardiac arrest (OHCA) where the aim is to obtain return of spontaneous circulation (ROSC), i.e. successful resuscitation. The aim of this study was to describe the impact of response interval on sustained ROSC, i.e. ROSC at hospital admission, after OHCA with presumed cardiac aetiology.


METHODS
We included all OHCA calls in which the Copenhagen Mobile Emergency Care Unit (MECU) was involved during the 2002-2008 period. Data were collected prospectively and the primary endpoint was sustained ROSC.


RESULTS
Resuscitation was attempted in 2,678 OHCA cases. Among these, cardiac aetiology was presumed in 2,327 cases, and 745 patients (32.0%) achieved sustained ROSC. The mean response interval was significantly shorter for patients who obtained sustained ROSC (370 seconds) than for patients who did not (394 seconds) (p = 0.015).


CONCLUSIONS
A significantly shorter response interval was observed in patients who were successfully resuscitated after out-of-hospital cardiac arrest than in patients who were not successfully resuscitated.
Department of Anaesthesia, Centre of Head and Orthopaedics, Rigshospitalet, Copenhagen, Denmark. hien.quoc.do@rh.regionh.dk
Hien Quoc
HQ
Do
Søren Loumann
SL
Nielsen
Lars Simon
LS
Rasmussen
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000552:Ambulances / Q000458:organization & administration*; D016887:Cardiopulmonary Resuscitation; D015331:Cohort Studies; D003718:Denmark; D004632:Emergency Medical Services / Q000458:organization & administration*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D058687:Out-of-Hospital Cardiac Arrest / Q000175:diagnosis / Q000401:mortality* / Q000628:therapy*; D010343:Patient Admission; D012189:Retrospective Studies; D015996:Survival Rate; D013997:Time Factors; D016896:Treatment Outcome