Patent ID: 7463923

Claim:
A method for dynamically determining a second phase of a transchest external defibrillation biphasic shock pulse which, when applied though electrodes positioned on a patient's torso, will produce a desired response in the patient's cardiac cell membranes, including: providing a quantitative model of a defibrillator circuit for producing the external defibrillation shock pulse; providing a quantitative model of a patient including a chest component, a heart component and a cardiac cell membrane component; providing a quantitative description of a predetermined response of said cardiac cell membrane to said shock pulse; and providing instructions comprising: computing a quantitative description of a first phase of a transchest external defibrillation shock pulse that will produce said predetermined cardiac cell membrane response, wherein said computation is made as a function of predetermined cardiac cell membrane response, the patient model and defibrillator circuit model; and computing a quantitative description of a second phase of a transchest external defibrillation shock pulse based on the first phase.