ICU stay can lead to depression

Patients who are treated in an intensive care unit (ICU) and survive are at increased risk of depression, a new study suggests. And depression in ICU survivors was linked with a higher risk of death in the next two years, researchers found.

More than half of former ICU patients reported symptoms of psychological disorders, including anxiety, depression and past-taumatic stress disorder (PTSD), according to the study.

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“Psychological problems — anxiety, depression, PTSD — after being treated for a critical illness in the ICU are very common and often complex when they occur,” said the study’s lead author. “Patients who reported symptoms of depression were 47 per cent more likely to die from any cause during the first two years after discharge from the ICU than those who did not report these symptoms.”

The researchers followed 4,943 ICU patients who had spent at least 24 hours in one of 26 ICUs in the UK between 2006 and 2013. The patients were asked to fill out questionnaires at three and 12 months following discharge from intensive care.

 

The questionnaires probed for signs and symptoms of psychological disorders. When the responses were analysed, the researchers determined that 46 per cent of the patients were experiencing symptoms consistent with a diagnosis of anxiety, 40 per cent reported depression symptoms, and 22 per cent reported symptoms of PTSD. Often, patients had symptoms of more than one disorder. In fact, 18 per cent of the patients met the criteria for all three psychological conditions.

Patients who reported symptoms consistent with a diagnosis of depression were 47 per cent more likely to die from any cause during the first two years after discharge from the ICU than those who did not report these symptoms. Increased risk of death was not associated with symptoms of anxiety or PTSD.

 “The reason detecting and recognising psychological problems is so important, is that they are a major cause of poor quality of life following critical illness and they are potentially treatable,” Hatch said in an e-mail. “Our findings suggest that depression following care of a critical illness in the ICU may be a marker of declining health and clinicians should consider this when following up with former ICU patients.”

The new findings were somewhat of a surprise for  an associate professor of psychiatry.

“We knew that symptoms of depression were associated with a worse quality of life after a critical illness,” the Dr. said. “But this shows that they are also associated with mortality. I was struck by the fact that they were 47 per cent more likely to die.”

The Dr. said that a similar study in the US would most likely find similar results.

While the study does not explain why depression might shorten life, there are studies in other areas of medicine that might help shed light on the subject, he said. “In patients with diabetes and heart disease, depression doesn’t just affect how they feel, it affects their behaviour,” he explained. “From the diabetes literature we know that depressed patients are often not taking as good care of themselves: they don’t take their medications and they miss appointments with their doctors.” 

The solution may be better monitoring of patients after they leave the ICU, he  said. “At the hospital we’ve been talking about doing a better job of screening patients for psychological symptoms after they’ve been treated and released from the ICU,” he added. “Then we can get treatment for all of those who screen positive.”