Abstract: The invention relates to an apparatus and a method for automated Cardio Pulmonary Resuscitation. The apparatus comprises a chest compression actuator, an actuator driver that supplies time-varying drive signals to the chest compression actuator in dependence of operating parameters of the actuator driver, a physiological parameter sensor supplying measured values of a physiological parameter related to the function of the chest compression actuator, and an adaptive control for the operating parameters of the actuator driver. The operating parameters determining a dynamic behavior of a system comprising the chest compression actuator and a chest of a patient.

Abstract: A method for applying a plurality of compressive forces to a thorax of a patient, measuring a displacement corresponding to each of the plurality of compressive forces, and determining properties of the thorax based on the compressive forces and the displacement. A system having a force applying device applying compressive forces to a thorax of a patient, a measurement device measuring a displacement of the thorax corresponding to each of the compressive forces, and a control device determining properties of the thorax based on the displacements of the thorax corresponding to each of the compressive forces.