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Med Klin Intensivmed Notfmed. 2018 Mar;113(2):124-130. doi: 10.1007/s00063-017-0278-9. Epub 2017 Apr 4.

Improvement of lay rescuer chest compressions with a novel audiovisual feedback device : A randomized trial.

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Cardiovascular Centre, St. Josef Hospital, University Hospital of the Ruhr-University Bochum, Gudrunstraße 56, 44791, Bochum, Germany.
Department of Cardiology, Charité - Universitätsmedizin Berlin, Campus Virchow-Klinikum, Berlin, Germany.
Department of Epidemiology, German Institute of Human Nutrition, Potsdam-Rehbruecke, Germany.
Department of Nephrology and Intensive Care Medicine, Charité - Universitätsmedizin Berlin, Campus Virchow-Klinikum, Berlin, Germany.



Bystander actions and skills determine among others the outcome of out-of-hospital cardiac arrest. However, the depth and rate of chest compressions (CC) are difficult to estimate for laypeople and poor CC quality may result. Our study aimed to evaluate the impact of a new feedback device on CC performance by laypeople. The percentage of CC with both correct rate and correct depth of all CC served as primary endpoint.


Forty-eight subjects with no medical background performed 2 min of CC on a manikin with and without a novel feedback device (TrueCPR™, Physio-Control, Redmond, Wash.). The device uses a novel, non-accelerometer-based technology. Participants were randomized into two groups. Group 1 performed a 2-min CC trial first with audiovisual feedback followed by a trial with no feedback information, while group 2 performed the task in reverse order.


The absolute percentage of CC with correct rate and depth was significantly higher with the use of the device (59 ± 34% vs. 15 ± 21%, p < 0.0001). The longest interval without correct CC was significantly decreased (76.5 s vs. 27.5 s, p < 0.0001).


The quality of CC carried out by laypeople is significantly improved with the use of a new feedback device. The device may be useful for cardiopulmonary resuscitation (CPR) by laypeople and for educational purposes.


CPR performance; Lay resuscitation; Real-time feedback


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