My father was sedated to insert a ventilator now his blood pressure is low , is this normal?

My father had a heart attack three days ago, his enzyme level are good minimal damage was done it appears. Now his doctor, feels his stomach is distended and did a CT Scan to see if there is a blockage, (he cannot hold down food and has no appetite). To do this they had to lay him flat. To lay him flat they had to insert a ventilator, to insert the ventilator they had to sedate him, the sedation has caused low blood pressure. Now they want to insert a Central (PICC) line to infuse the blood pressure medication. It appears everything they do causes another action to be required, He is 80 years old. Is all of this necessary, and considering what he has been through I am afraid his body cannot take all of these procedures, are they really necessary??