December 14, 2023

How a Chest Compression Feedback Device Monitors CPR Performance

Chest compressions are an important part of cardiopulmonary resuscitation (CPR), a lifesaving technique used to restore blood flow and oxygen to the heart and brain in the event of cardiac arrest. Chest compressions must be performed properly and consistently to maximize the chances of survival. Unfortunately, they can be difficult to perform correctly in high-stress emergency situations, especially for novice rescuers. Using a chest compression feedback device can help improve the quality of CPR. These devices monitor CPR performance and provide real-time audio or visual feedback on important metrics such as hand position, compression rate, depth, and chest recoil to optimize the quality of manual chest compressions.

Several studies on simple feedback systems have shown that using them can significantly increase the rate of manual chest compressions. Typically, these systems use metronome-like sounds to maintain a consistent rhythm and a visual display of the compression rate. However, these devices have not yet been proven to improve adherence to the guidelines for chest compression depth and rate in actual cardiac arrest patients.

The latest feedback devices are based on accelerometers or pressure sensors that measure the force applied during chest compressions. They also provide audio feedback on the depth of chest compressions, helping to ensure they are at a depth of 2-6 inches (5-6 cm). Additionally, the devices will indicate whether or not the rib cage is moving during each compression cycle by signaling a click sound.

A number of these devices also offer feedback on other aspects of the CPR process, such as the chest compression fraction (the percentage of time during which chest compressions are being performed) and hand position recoil. They can also calculate the amount of time during which a pause in chest compressions is occurring.

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