Downey, E.L., Andress, K., and Schultz, C.H. (2013). Initial Management of Hospital Evacuations Caused by Hurricane Rita: A Systematic Investigation. (Abstract only.) Prehospital and Disaster Medicine. 28(3):257-63.
The authors conducted a retrospective study on seven hospitals that either evacuated or sheltered in place during and after Hurricane Rita. They found that hospitals should plan for continuous patient arrival even during evacuation, and certain shortages (e.g., staff and food) when sheltering in place.