Medical Bays
Areas of the ship can be designated as Medical Bays (sick bay). Although they are not a system in the conventional sense, they do draw power. Breaches to the outside atmosphere will make these areas inoperable (and stop them from drawing power).
If power is cut to sickbay, then they will no longer be able to heal patients.
Power Requirements
Each sickbay draws 1MW of power per active patient.