Systems and methods related to the field of cardiac resuscitation, and in particular to devices for assisting rescuers in performing cardio-pulmonary resuscitation (CPR) are described herein. In some aspects, the system includes a chest compression sensor providing movement information during a plurality of manual chest compressions performed by a rescuer on a chest of a patient； a release sensor providing information as to whether the rescuer's hands are in contact with the release sensor during manual chest compressions or not in contact with the release sensor between manual chest compressions； a computing unit； and an audio and/or visual display providing feedback received from the computing unit to the rescuer regarding chest compression rate, chest compression depth and whether the rescuer's hands are not in contact with the release sensor between manual chest compressions.
