Autonomous Mechanical CPR Device

An apparatus for providing mechanical CPR to a victim comprising:

• a mechanical CPR device having a compression module comprising a ram having a contact surface, the ram controlled by a control system capable of delivering CPR to a victim during a CPR session;
• wherein, the control system comprises a hardware processor, a memory, and instructions stored in the memory and executable by the hardware processor, the instructions capable of performing the following steps:
• establishing, by the control system, an initial therapeutic position for the contact surface of the ram relative to an initial position of the victim's chest,
• controlling, by the control system, the ram to provide a CPR stroke thereby compressing the chest of the victim, and
• establishing, by the control system, a beginning therapeutic position, where the beginning therapeutic position is based on a decompressed position of the chest of the victim at a beginning of a second CPR stroke.