Tulane Univ. Hospital is evacuating by air, using 20 helicopters from their parent company and lifting one or two patients with some staff each trip and carrying them to triage centers outside of the city.
Several hundred patients and staff remain in the hospital at last word; the water's much faster rise, somewhere between 2-to-4 feet per hour, has knocked out their fixed generators, and they're running essential equipment on portable generators.
I can't even imagine operating under these conditions. Tulane has created an emergency blog. I don't know how much longer they'll be able to keep it updated.