Abstract 95: Using Accelerometers to Track Chest Wall Motion During CPR
Hypothesis: The use of accelerometers placed on the sternum to monitor CPR quality and provide real-time rescuer feedback has dramatically improved CPR delivery. However, these devices focus on the rescuer. We hypothesize that similar technology can be developed to track 3-D chest wall motion during CPR, which will provide information on the affect of CPR on the victim.
Methods: An accelerometer data collection system and software package has been assembled. The system tracks 4 accelerometers in real time, and the software package analyzes the acceleration signals to provide 3-D motion of the accelerometer as a function of time. The system is scalable, and it is anticipated that the number of accelerometers will ultimately be significantly higher (∼16).
Results: Data has been collected on two test systems. The first test system is a computer controlled linear motor. This system was used to verify signal processing against a known motion signal. The second system was a CPR training mannequin. Two test cases were run. In the first case all four accelerometers were placed on the chest wall of the mannequin. In the second case, three accelerometers were placed on the mannequin, and one was placed on the table where the mannequin was located. A representative data set is shown below. Before presentation of this work, the system will be placed on the chest wall of swine in our ongoing swine CPR study.
Conclusions: Integration of accelerometer signals to determine displacement leads to numerical errors. The integrated signal can be significantly improved by imposing constraints consistent with CPR chest compressions. Our results indicate it is possible to use accelerometers to track chest wall motion.
- © 2010 by American Heart Association, Inc.