Physio-Control LIFEPAK CR Plus Posted on September 21, 2017 by Physio-Control LIFEPAK CR Plus LIFEPAK EXPRESS defibrillator AEDS are portable electronic devices that automatically diagnose the potentially life threatening cardiac arrhythmias of ventricular fibrillation. With LIFEPAK EXPRESS you assess the person in sudden cardiac arrest, then open the device and apply the electrodes. The device analyzes the heart’s rhythm and tells you to push a button.