re: Jamie Foxx's loved ones reportedly preparing for worst as his health declines

High blood pressure is the biggest modifiable risk factor for stroke.

Over the long term, it causes plaque to accumulate in arteries. Some of these plaques will erode/"rupture" and cause clots to form with complete arterial occlusion.

I surmise that he had a basilar artery occlusion that required intervention. That's the most common type of stroke that would require "resuscitation" on scene