Post-op diagnosis?

I am working on a care plan for a post-op CABG patient. I want the care plan to focus on the interventions we use for the post-op patient, such as using the incentive spirometer and early ambulation. I can't seem to find a diagnosis for this. All I keep getting in searches is diagnoses for the problems the CABG was supposed to alleviate. I just can't see using decreased cardiac output when the patient now has adequate output.

Any suggestions?