Abstract 17064: The Accuracy of an Impedance Cardiogram Based Compression Rate Feedback Algorithm Versus Real-time Video Recording of Chest Compression Rate
Objective: It is widely known that CPR administered in all settings may be sub-optimal. CPR feedback tools can provide reliable feedback to operators to improve compression rate, depth and fraction. The purpose of this study was to evaluate the use of a CPR rate feedback algorithm incorporated into an automated external defibrillator by comparing the CPR compression rate measured by an Impedance Cardiogram based feedback device, a video recording of real-time CPR and using a commercially available accelerometer
Hypothesis: ICG based CPR feedback is as effective as accelerometer based feedback.
Methods: A total of twelve porcine models were used each weighing 29.62±4.2kg. Rate (CPM), End-tidal CO2(ETCO2), Blood Pressure (BP), SpO2 (%) and Depth (mm) was measured for each model. The Impedance Cardiogram (ICG)/Thoracic Impedance was recorded via 2 standard defibrillation electrodes and as a method of detecting the presence of CPR. Ethical approval was granted by the Northern Ireland Home Office and the Home Office in Scotland. Models were anaesthetised using Propofol and Isoflurane and connected to a Datex Ohmeda® monitor for anaesthesia monitoring. A number of physiological measurements were taken every 2 minutes via the carotid and jugular. Rate and depth were measured continuously using Q-CPR®, Philips. Recordings from each experiment were acquired using Datex Ohmeda review software for further statistical analysis using SAS 9.2®.
Findings: The proportion of correct audio and visual feedback of the Impedance Cardiogram based feedback device versus the actual CPR compression rate as demonstrated in video recordings was 95.2%. The study also showed that the proportion of “correct” audio and visual feedback of the SAM 450P CPR Rate Feedback algorithm versus the accelerometer rate (CPM) was 87.5% due to underestimation of some measures in the non-ICG based device.
Conclusions: Therefore it could be concluded that an Impedance Cardiogram based feedback device is highly sensitive to end user chest compression rate over a wide range of rates (40 to 180 compressions-per-minute).
Author Disclosures: R. Di Maio: Employment; Significant; Rebecca Di Maio. P. Crawford: Employment; Modest; Paul Crawford. O. McAlister: Employment; Modest; Olibhear McAlister. H. McReynolds: Employment; Modest; Hannah McReynolds. E. Clutton: None. J. Adgey: Consultant/Advisory Board; Modest; Prof Adgey.
- © 2015 by American Heart Association, Inc.