Staff numbers at Enniskillen's main hospital are to double if there is trouble at the G8 summit.
World leaders will gather at the Lough Erne golf resort next Monday and Tuesday and hundreds of extra hospital beds have been made available.
All non-urgent elective surgery which would have taken place on Monday and Tuesday at the South West Acute Hospital has been rescheduled.
Patients will be offered rearranged appointments as soon as possible after the summit.
Up to 5,000 additional people could be in Enniskillen this weekend, including delegates, their staff and protesters.