His diabetes is currently managed on 40 units of NPH insulin q a.m. Give consideration to your choice of intravenous fluids and methods of monitoring glucose control. His foley catheter is removed on the morning of the 2nd postoperative day. Ten hours after removal of the catheter, the patient complains that he has been unable to void. Physical exam at this time reveals a bladder distended to 2 cm below the umbilicus.
Rectal exam reveals mild prostatic hypertrophy.