A protective casing to enhance use of an automated external defibrillator device before arrival of emergency medical personnel and adapted to abuttingly contact one or more side portions of and retain a mobile phone configured to communicate with the Internet thereby to define a smartphone when the smartphone is positioned therein, the protective casing comprising: one or more processors thereby to define casing processors; one or more input and output units in communication with the casing processors and further in communication with a smartphone; one or more sensors in communication with the casing processors; one or more capacitors in communication with the casing processors; two or more extendable electrode pads in communication with the casing processors and configured to transmit a current responsive to activation of the one or more capacitors; and non-transitory memory medium in communication with the casing processors and configured to include a plurality of modules, each of the modules including computer-readable instructions stored in the computer-readable medium that when executed by the casing processors cause the casing processors to perform operations, the plurality of modules including: a check module to determine, by use of the two or more extendable electrode pads and the one or more sensors, whether the victim's heart rhythm requires an electrical shock to reestablish a normal heart rhythm responsive to input from the smartphone, a space module to measure, by use of the one or more sensors, presence and amount of preselected materials relatively near the protective casing thereby to define environmental data responsive to the check module, and a shock module to activate the one or more capacitors and generate an electrical current between the two or more extendable electrode pads to deliver an electrical shock to the victim's chest by use of the two or more extendable electrode pads responsive to the check module, the space module, and input from the smartphone. one or more processors thereby to define casing processors; one or more input and output units in communication with the casing processors and further in communication with a smartphone; one or more sensors in communication with the casing processors; one or more capacitors in communication with the casing processors; two or more extendable electrode pads in communication with the casing processors and configured to transmit a current responsive to activation of the one or more capacitors; and non-transitory memory medium in communication with the casing processors and configured to include a plurality of modules, each of the modules including computer-readable instructions stored in the computer-readable medium that when executed by the casing processors cause the casing processors to perform operations, the plurality of modules including: a check module to determine, by use of the two or more extendable electrode pads and the one or more sensors, whether the victim's heart rhythm requires an electrical shock to reestablish a normal heart rhythm responsive to input from the smartphone, a space module to measure, by use of the one or more sensors, presence and amount of preselected materials relatively near the protective casing thereby to define environmental data responsive to the check module, and a shock module to activate the one or more capacitors and generate an electrical current between the two or more extendable electrode pads to deliver an electrical shock to the victim's chest by use of the two or more extendable electrode pads responsive to the check module, the space module, and input from the smartphone. a check module to determine, by use of the two or more extendable electrode pads and the one or more sensors, whether the victim's heart rhythm requires an electrical shock to reestablish a normal heart rhythm responsive to input from the smartphone, a space module to measure, by use of the one or more sensors, presence and amount of preselected materials relatively near the protective casing thereby to define environmental data responsive to the check module, and a shock module to activate the one or more capacitors and generate an electrical current between the two or more extendable electrode pads to deliver an electrical shock to the victim's chest by use of the two or more extendable electrode pads responsive to the check module, the space module, and input from the smartphone.