A nurse summons you too assess a 300-pound, one-day post-operative cholecystectomy patient. He has no fever, has no productive cough, and has a negative chest x ray. He is, however, reluctant to change body position in bed. Auscultation reveals normal breath sound, but shows diffuse "crackles" in the posterior segments of the lower lobes. Specific first interventions would include:
A. Oxygen therapy
B. Aerosol treatment every 4 hours until crackles are gone
C. Positive pressure hyperinflation therapy
D. "Shake-up" regimen
I think the answer is C, but my friends put D