I’m worried sick.. is there a chance he’ll be okay?

Just had to call the rescues squad for my grandfather. He was sleeping all morning then I found him unresponsive and barely had a pulse. They pinched him and everything, no response. He has tons of health issues, he’s on dialysis, has strokes and seizures, has diabetes, has a hole in his heart, and dementia. He’s 80 years old. His mother died around this age. I’m 19, I’ve lived with them my entire life, I’m so worried. Does anyone know the possibilities of what could be happening? Be as truthful as you can, even if it hurts.