My Dad Had Alzeimers And He Got Heart Stroke ,

My Dad had Alzeimers and he got heart stroke , So now his condition is stable they discharged from hospital. They did not take angiogram still has one of his kidney reading is 1.8 which has to be 1.6 .
But Cardiologist Doctors are saying once we take angiogram and find out there are blocks if we need to take any action like angioplasty or stent or bypass there are so many complications so I am not sure what kind of complications they are thinking of they told of couple like paralysis and blood clots.
My Dad also had once blood clot in the brain for which they did burr hole surgery in 2013 and after that he did good. By that time of surgery also he had alzeimers.
So we are confused whether to do further treatment for heart or leave as is and just make sure he has quality of life .. please help me with your suggestion.