Hospitals in New Orleans started preparations several days ahead of Isaac's arrival. In fact, some of the preparations have technically been going on for months. Ochsner Health System, a non-profit healthcare provider located in and around New Orleans, is keeping all of its hospitals and emergency rooms open during and after the storm to help treat potential patients. According to Thomas, one of the biggest downfalls of hospitals and medical centers during Hurricane Katrina was their inability to sustain themselves after loss of power. Two of the most important aspects a hospital needs to consider, Thomas said, are air conditioning and water.