Hi I Have A Vistula And Diverticulitis And Bowel Obstruction

Hi I have a vistula and diverticulitis and bowel obstruction in small intestine now they have seen my arteries are thinned out now they want to do a ultrasound to check them to my colon before doing any surgery does this seem right I seem to be getting more problems as I wait does this seam like the right thing to do