Peer support appeared to reduce psychologic morbidity and increase social support. The evidence for peer support in critically ill populations is limited. There is a need for well-designed and rigorously reported research into this complex intervention. Two-thousand nine-hundred thirty-two studies were screened. Eight were included, comprising 192 family members and 92 patients including adults (with cardiac surgery, acute myocardial infarction, trauma), pediatrics, and neonates. The most common peer support model of the eight studies was an in-person, facilitated group for families that occurred during the patients’ ICU admission.

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