NP supervision of Cardiovascular Stress Testing

Best answers
The most recent information I can find is from 2010 - states a APN must be under Direct Supervision to preform cardiac stress test- has there been any change to this policy? Also does anyone have the guidelines or Facility Policy for training of the APN to be able to supervise these test. Finally our facility performs both inpatient and outpatient stress test in the same area are there any specific guidelines regarding this type of facility? Thank You