Doctors have gradually come to realize that people who survive a serious brush with death in the intensive care unit are likely to develop potentially serious problems with their memory and thinking processes.

This dementia, a side effect of intensive medical care, can be permanent. And it affects as many as half of all people who are rushed to the ICU after a medical emergency. Considering that 5.7 million Americans end up in intensive care every year, this is a major problem that until recently, has been poorly appreciated by medical caregivers.