Hi Happyliza!
I recently read an article about magnesium: the IV Mg is very usefull in stressfull conditions as surgery (all surgeries), heart attack, etc.
In addition to vit C IV, the IV will be very helpfull to him.
Here's a reference:
https://www.sott.net/article/260178-If-you-get-a-heart-attack-insist-on-magnesium