Patent attributes
A dosage for electrotherapy delivered to a patient, such as a defibrillation pulse delivered by an external defibrillator, is selected based on an age-related classification, such as adult or child, and a measured electrical parameter, such as the transthoracic impedance, of the patient. For example, a nominal voltage level for an energy storage circuit may be determined based on a nominal dosage. The nominal voltage level may be adjusted by applying a function that relates voltage level adjustment to impedance to the measured impedance. The function may be selected based on the age-related classification of the patient. The dosage of the defibrillation pulse delivered based on the adjusted voltage level, i.e., the selected dosage, may have a substantially equivalent probability of success for the patient as the nominal dosage would provide for a reference patient with an average transthoracic impedance for the class of which the patient is a member.
