Final answer:
In case of hypermagnesemia toxicity, it is critical to stop any magnesium intake, support ventilation, administer IV Calcium gluconate, and consider hemodialysis for severe cases.
Step-by-step explanation:
When a patient experiences hypermagnesemia toxicity, several actions should be taken to stabilize the patient and lower magnesium levels. The first step is to discontinue any magnesium-containing IV or medications. The next step is to support ventilation, especially if the patient has depressed respiratory function, which can be a symptom of severe hypermagnesemia. Administration of IV Calcium gluconate is often necessary to counteract the effects of high magnesium on the heart and other muscles. In cases where hypermagnesemia is severe and not responsive to more conservative measures, hemodialysis may be required to quickly remove magnesium from the bloodstream.