A defibrillator that assesses and provides feedback on cardiopulmonary resuscitation (CPR) performed by a person on a subject. The device comprises a biosignal measurement system to monitor the subject, determine whether CPR is required and provide start/stop signals, a CPR measurement system configured to measure compressions performed by the person, and a feedback unit to issue CPR feedback to the person. A CPR assessment system configured to: set a baseline equal to a performance measurement of a first plurality of compressions, produces a further performance measurement (FPM) from a further plurality of compressions, compares the FPM with the baseline, and outputs feedback signals dependent on the comparison result. If the FPM is greater than the baseline it is set as the updated baseline. A new FPM is then produced from a new further plurality of compressions and the process repeats. The CPR measurement system may measure thoracic impedance signals.
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