Patent ID: 8838233

Claim:
An external defibrillator comprising: a connection port configured to couple the external defibrillator to a plurality of electrodes; an energy storage device coupled to the connection port; and a controller coupled to the connection port and the energy storage device, wherein the controller is configured to: cause an initial defibrillation shock to be delivered through electrodes attached to a patient; determine a rate to charge the energy storage device to substantially achieve a first charge used for the initial defibrillation shock; charge the energy storage device at the determined rate to substantially achieve the first charge used for the initial defibrillation shock; complete a physiology analysis of the patient; and determine whether a subsequent defibrillation shock is advisable based on the physiology analysis of the patient, wherein the controller is configured to determine the rate to charge the energy storage device based on Q Rate =(Q Initial −Q final )/Time Analysis , wherein Q Initial refers to a magnitude of an initial charge when charging begins, Q final refers to a magnitude of a final charge, and Time Analysis refers to an amount of time needed for the physiology analysis to be completed.