System for determining depth of chest compressions during CPR

A system for determining a chest compression depth and for providing therapy during an administration of chest compressions to a patient, the system comprising:

• a chest compression apparatus configured to receive chest compression data from sources of the chest compression data comprising:
• a compression monitor adapted to be disposed at a first location that is on the chest of the patient and to move in accordance with the chest of the patient during the administration of the chest compressions, the compression monitor operable to provide a compression acceleration signal indicative of acceleration of the chest of the patient, and
• a system of one or more reference sensors comprising at least one accelerometer adapted to be disposed at a second location that is on the patient and operable to provide at least one acceleration signal indicative of a same external acceleration that the patient experiences during the administration of the chest compressions;
• at least one processor configured to:
• receive and process the compression acceleration signal and the at least one acceleration signal indicative of the same external acceleration that the patient experiences to determine an estimated actual acceleration, and
• doubly integrate the estimated actual acceleration to produce an estimated actual chest compression depth;
• and
• a display operatively coupled to the at least one processor and configured to provide chest compression feedback for a rescuer based on the estimated actual chest compression depth.