Evaluation of contributing factors to successful CPR following out-
of-hospital cardiac arrest
Oleksandr Opanasenko, Eva Havlikova, Volodymyr Kizyma
Falck Zachranna, Kosice, Slovakia
Corresponding author: firstname.lastname@example.org
Keywords: out-of-hospital cardiac arrest, successful resuscitation,
high-quality chest compressions
Aim: ERC Guidelines define effective bystander BLS, high-quality chest
compressions and early defibrillation as the main contributing factors to
improve survival after cardiac arrest. Falck Zachranna, the leading EMS
provider in Slovakia, uses a Physio-Control software to abstract from
defibrillator recordings and analyze parameters of the real CPR such as
chest compressions and ventilation parameters. The aim of our study was
to evaluate the abovementioned factors influence on survival odds in
patients after out-of-hospital cardiac arrest (OHCA).
Methods: Authors analyzed 193 cases of shockable OHCA where patients
developed sustained return of spontaneous circulation (ROSC) and were
transported to hospitals. The data were gathered from September 2015 till
December 2017. Authors focused on such parameters as bystander BLS,
chest compressions ratio and rate, ETCO2 concentrations and time to first
shock. The chest compressions ratio and rate and ETCO2 concentrations
before ROSC were chosen as the indicators of uninterrupted, high-quality
Results: The median figures for the chosen parameters were the following:
compression ratio 85%, compression rate 111/min, pre-ROSC ETCO2 30
mmHg, time from OHCA confirmation to first shock 20.50 sec. The
average results for the compression parameters were the following:
compression ratio 82.5±11%, compression rate 112±10/min.
Contraversively, 14.5% of the patients (n=28) had no bystander BLS.
Conclusion: Authors believe that the acquired figures of compressions
ratio and rate and pre-ROSC ETCO2 could be considered as possible
performance targets for high-quality chest compressions. Yet, a study
needs to be fulfilled about relationships of the factors and long-term
patient survival following OHCA.