Patent ID: 8831719

Claim:
An external defibrillator comprising: a therapy delivery circuit configured to be electrically charged and to deliver electrical therapy to a patient; a sensor configured to sense a physiological condition of the patient and generate data indicative of a probability that therapy will be delivered to the patient; and a processor configured to: perform a charge advisory analysis using the data generated by the sensor and a first set of criteria and initiate charging the therapy delivery circuit based on the outcome of the charge advisory analysis; and perform a shock advisory analysis that is a different analysis than the charge advisory analysis and uses a second set of criteria that is different than the charge advisory analysis criteria, and initiate charging the therapy delivery circuit based on the outcome of the shock advisory analysis when charging has not been initiated based on the outcome of the charge advisory analysis, wherein the charge advisory analysis is performed during a first time period and the shock advisory analysis is performed during a second time period that overlaps the first time period.