Final answer:
An Automated External Defibrillator (AED) should be readily available as a backup wherever resuscitation may be needed, in case a compressed gas source fails.
Step-by-step explanation:
An Automated External Defibrillator (AED) should be readily available as a backup wherever resuscitation may be needed, in case a compressed gas source fails. AEDs are portable devices that provide verbal instructions and are designed to be used by lay persons. They automatically diagnose the patient's heart rhythm and apply the appropriate shock.