There was too much edema to successfully complete the operation

identify all the referential expressions in the text below and determine the correct referent for each. Assume that the computer attempts to identify reference by finding the most recent noun phrase. How well does this resolution rule work? Suggest a more effective rule.

The clinical text:
“The patient went to receive the AV fistula on December 4. However, he refuses transfusion. In the operating room it was determined upon initial incision that there was too much edema to successfully complete the operation and the incision was closed with staples. It was well tolerated by the patient.”