Annually, about five million patients stay in an intensive care unit in the United States. Studies show that up to 35 percent may have symptoms of PTSD for as long as two years after that experience, particularly if they had a prolonged stay due to a critical illness with severe infection or respiratory failure. Those persistent symptoms include intrusive thoughts, avoidant behaviors, mood swings, emotional numbness and reckless behavior.
Lygia Dunsworth, a registered nurse in Texas, had traumatic hallucinations while in the I.C.U. after abdominal surgery and infection. Afterward she had symptoms associated with PTSD for several years.
She described her hallucinations in the British journal BMJ