Selecting electrotherapy dosage

A device comprising:

• a set of electrodes for coupling to a patient;
• a measuring circuit that measures an electrical parameter of the patient via the electrodes;
• and
• a processor to select a dosage based on an age-related classification of the patient and the measured electrical parameter, and control delivery of electrotherapy at the selected dosage to the patient via the electrodes.

A method comprising:

• receiving an indication of an age-related classification of a patient;
• measuring an impedance of the patient;
• selectively applying one of a set of functions to the measured impedance based on the indicated age-related classification to determine a voltage level adjustment;
• identifying a nominal defibrillation pulse energy level;
• determining a nominal voltage level based on the nominal defibrillation pulse energy level;
• adjusting the nominal voltage level as a function of the determined voltage level adjustment;
• and
• delivering a defibrillation pulse at an energy level that is a function of the adjusted voltage level to the patient.

A method comprising:

• creating a model that describes a relationship between voltage level, impedance, and cardiac response;
• determining average impedance values for each of a plurality of age-related classifications of patients;
• and
• determining a function that describes a relationship between voltage level adjustment and impedance for each of the classifications based on the model and the average impedance for the classification.

A method comprising:

• identifying a nominal dosage;
• selecting a dosage based on a measured electrical parameter of a patient that is a child and the nominal dosage to provide a first probability of successful electrotherapy for the patient based on the measured electrical parameter that is substantially equivalent to a second probability of successful electrotherapy provided by the nominal dosage based on an average value for the electrical parameter for children;
• and
• delivering electrotherapy at the selected dosage to the patient.

A method comprising:

• identifying a nominal dosage;
• selecting a dosage based on a measured electrical parameter of a patient that is a child and the nominal dosage;
• and
• delivering electrotherapy at the selected dosage to the patient, in which selecting a dosage comprises selecting a dosage that is one of greater than the nominal dosage if the measured electrical parameter is greater than an average value of the electrical parameter for children, less than the nominal dosage if the measured electrical parameter is less than the average value, and equal to the nominal dosage if the measured electrical parameter is equal to the average value.