Abstract
Background. Cardiopulmonary resuscitation (CPR) feedback devices are being increasingly used. However, current accelerometer-based devices overestimate chest displacement when CPR is performed on soft surfaces, which may lead to insufficient compression depth. Aim. To assess the performance of a new algorithm for measuring compression depth and rate based on two accelerometers in a simulated resuscitation scenario. Materials and Methods. Compressions were provided to a manikin on two mattresses, foam and sprung, with and without a backboard. One accelerometer was placed on the chest and the second at the manikin's back. Chest displacement and mattress displacement were calculated from the spectral analysis of the corresponding acceleration every 2 seconds and subtracted to compute the actual sternal-spinal displacement. Compression rate was obtained from the chest acceleration. Results. Median unsigned error in depth was 2.1 mm (4.4%). Error was 2.4 mm in the foam and 1.7 mm in the sprung mattress (p < 0.001). Error was 3.1/2.0 mm and 1.8/1.6 mm with/without backboard for foam and sprung, respectively (p < 0.001). Median error in rate was 0.9 cpm (1.0%), with no significant differences between test conditions. Conclusion. The system provided accurate feedback on chest compression depth and rate on soft surfaces. Our solution compensated mattress displacement, avoiding overestimation of compression depth when CPR is performed on soft surfaces.
Highlights
Quality of cardiopulmonary resuscitation (CPR) is key to increase survival from cardiac arrest
The aim of the study was to quantify the error in the estimation of chest compression depth and rate during Cardiopulmonary resuscitation (CPR) performed on soft surfaces
When only the chest acceleration was used, the global median of the error in the estimation of compression depth was 18.1 mm (7.2, 32.8), which corresponded to a percent error of 41.1% (15.3, 72.9)
Summary
Quality of cardiopulmonary resuscitation (CPR) is key to increase survival from cardiac arrest. Transferring the patient to the floor would ensure a firm surface, but it cannot always be done safely and promptly Another alternative would be the use of backboards, which can be placed beneath the patient during CPR to increase the area over which the compression force is spread and reduce the amount of mattress compression. Current accelerometerbased devices overestimate chest displacement when CPR is performed on soft surfaces, which may lead to insufficient compression depth. The system provided accurate feedback on chest compression depth and rate on soft surfaces. Our solution compensated mattress displacement, avoiding overestimation of compression depth when CPR is performed on soft surfaces
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