Not sure what to think

Today when I got home from work Grandma Judy let me know Lance had not been to the bathroom all day. After a call to The Sibley Heart Center we were on our way to Children's Health Care of Atlanta for what I was told would be some lab work. When we got there they told me Lance was a direct admit and was going straight to the cardiac stepdown unit. They did a chest x-ray and ran some lab work and still at this point no urine output. So at this point it has been over 24 hours since he has gone to the restroom. We just found out that they are going to put an IV with fluids and if he has not had any urine within a couple of hours they will put a cath in and try some other things. At this point we are not sure if this is a problem relating to his heart function. I will hopefully know more tomorrow.