Abstract: A guide system for indicating an activator of a defibrillator to a user including a motion detection circuit which determines motion of the defibrillator and generates at least one defibrillator motion mode signal, and a guide circuit which receives the defibrillator motion mode signal and causes the activator to be indicated to the user of the defibrillator.

Abstract: A guide system for indicating an activator of a defibrillator to a user including a motion detection circuit which determines motion of the defibrillator and generates at least one defibrillator motion mode signal, and a guide circuit which receives the defibrillator motion mode signal and causes the activator to be indicated to the user of the defibrillator.

Abstract: A defibrillator for determining a cardiopulmonary resuscitation (CPR) compression rate, including electrodes adapted to be attached to the subject, an impedance signal measurement system connected to the electrodes and configured to measure at least one impedance signal of the subject, an electrocardiogram signal measurement system connected to the electrodes, an impedance signal processing system connected to the impedance signal measurement system, an electrocardiogram signal processing system connected to the electrocardiogram signal measurement system, a compression rate estimate processing system configured to apply a plurality of criteria to the impedance signal features and the electrocardiogram signal features and use compliance with one or more of the criteria to select one of the plurality of impedance signal compression rate estimates as the cardiopulmonary resuscitation compression rate, and an output unit configured to output feedback based on the cardiopulmonary resuscitation compression rate to