Is Dysphagia After Cardiac Operations a “Preexisting Condition”?

The authors tested a group of 176 patients undergoing cardiac surgery for dysphagia both preoperatively and postoperatively.  Preoperatively, 8.5% of patients failed the swallow test.  Postoperatively, 21.6% failed the test.  All patients who failed preoperatively also failed postoperatively.  Thus, approximately 40% fo patients who have postop dysphagia had evidence of dysphagia preoperatively.  
These results beg the question:  Ought we to be screening at-risk patients for dysphagia preoperatively?  If so, how would this change management postop?