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Resuscitation. 2017 Jul;116:60-65. doi: 10.1016/j.resuscitation.2017.05.005. Epub 2017 May 2.

Lower chest compression fraction associated with ROSC in OHCA patients with longer downtimes.

Author information

1
Prehospital, Resuscitation and Emergency Care Research Unit (PRECRU), School of Nursing, Midwifery and Paramedicine, Curtin University, Bentley, WA, Australia. Electronic address: milena.talikowska@postgrad.curtin.edu.au.
2
Prehospital, Resuscitation and Emergency Care Research Unit (PRECRU), School of Nursing, Midwifery and Paramedicine, Curtin University, Bentley, WA, Australia; Discipline of Emergency Medicine, University of Western Australia, Crawley, WA, Australia.
3
Prehospital, Resuscitation and Emergency Care Research Unit (PRECRU), School of Nursing, Midwifery and Paramedicine, Curtin University, Bentley, WA, Australia; St John Ambulance, Western Australia, Belmont, WA, Australia.
4
Prehospital, Resuscitation and Emergency Care Research Unit (PRECRU), School of Nursing, Midwifery and Paramedicine, Curtin University, Bentley, WA, Australia; St John Ambulance, Western Australia, Belmont, WA, Australia; Emergency Department, St John of God Murdoch Hospital, Perth, WA, Australia.
5
Prehospital, Resuscitation and Emergency Care Research Unit (PRECRU), School of Nursing, Midwifery and Paramedicine, Curtin University, Bentley, WA, Australia; St John Ambulance, Western Australia, Belmont, WA, Australia; School of Public Health and Preventive Medicine, Monash University, Melbourne, VIC, Australia; Discipline of Emergency Medicine, University of Western Australia, Crawley, WA, Australia.

Abstract

AIM:

To investigate the relationship between chest compression fraction (CCF) and survival outcomes in OHCA, including whether the relationship varied based upon downtime from onset of arrest to provision of cardiopulmonary resuscitation (CPR) by emergency medical services (EMS).

METHODS:

Data from resuscitations performed by St John Ambulance Western Australia (SJA-WA) paramedics between July 2014 and June 2016 was captured using the Q-CPR feedback device. Logistic regression analysis was used to study the relationship between CCF and return of spontaneous circulation (ROSC). Various lengths of Q-CPR data were used ranging from the first 3min to all available episode data. Cases were subsequently divided into groups based upon downtime; ≤15min, >15min and unknown. Univariate and multivariable logistic regression analyses were performed in each group.

RESULTS:

There were 341 cases eligible for inclusion. CCF >80% was significantly associated with decreased odds of ROSC compared to CCF≤80% (aOR: 0.49, 95%CI: 0.28-0.87). This relationship remained significant whether the first 3min of data was used, the first 5min or all available episode data. Among the group with a downtime >15min, CCF was significantly lower for those who achieved ROSC compared to those who did not (mean (SD): 73.01 (12.99)% vs. 83.05 (9.38)% p=0.002). The adjusted odds ratio for achieving ROSC in this group was significantly less with CCF>80% compared to CCF≤80% (aOR: 0.06, 95%CI: 0.01-0.38).

CONCLUSION:

We demonstrated an inverse relationship between CCF and ROSC that varied depending upon the time from arrest to provision of EMS-CPR.

KEYWORDS:

Cardiac arrest; Cardiopulmonary resuscitation; Chest compression fraction

[Indexed for MEDLINE]

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