As with all toxicological exposures, primary efforts after patient stabilization should be directed at decontamination to prevent further exposure.
Supportive care should be directed at airway support.  This may include supplemental oxygen, nebulized bronchodilators, and corticosteroids.
Hemodialysis is ineffective due to high protein binding
If severe poisoning from nickel carbonyl is suspected give 1 gram diethyldithiocarbamate  (DDC) in divided doses (not available in the United States)
There is limited evidence for the use of disulfiram in the treatment of nickel carbonyl.  No established dosing exists; however, disulfiram is metabolized to two molecules of DDC.  Contact your local toxicologist for further guidance in the use of chelators.  It is important to note that chelation with disulfiram in the setting of nickel carbonyl is not standard of care.
Nickel toxicity
Nickel carbonyl exposures should be considered in all relevant occupational or industrial exposures presenting with significant pulmonary, cardiac, or neurological findings. Other occupational and toxicological exposures that should be considered.
Zinc toxicity
Manganese
Mercury toxicity
Cadmium
Gold toxicity
Elemental mercury