People with depression and anxiety have a slightly increased risk of death after undergoing surgery, a new study suggests. U.S. researchers analyzed data from 35,539 surgical patients admitted to intensive care units between Oct. 1, 2003 and Sept. 30, 2006. Of those patients, 8,922 had an existing psychiatric condition, including 5,500 with depression, 2,913 with post-traumatic stress disorder, 2,473 with anxiety, 793 with bipolar disorder, and 621 with psychosis. Initial analysis showed that the death rates within 30 days after surgery were similar for patients with and without psychiatric illness 3.8 percent and 4 percent, respectively.
when the researchers adjusted for other factors, the death rate was higher for patients with a psychiatric condition, according to the report in the October issue of the journal Archives of Surgery. Further analysis showed that the increased risk of death was associated with depression and anxiety, but not any other psychiatric condition. Also, death rates were higher among patients with psychiatric conditions who had respiratory or digestive system surgery, but not for those who had surgery involving the circulatory, nervous or musculoskeletal systems.
"Several potential mechanisms exist to explain these findings," Dr. Thad E. Abrams, of the Iowa City Veterans Affairs Medical Center and University of Iowa Carver College of Medicine in Iowa City, and colleagues wrote in a news release from the journal's publisher. "First, studies indicate that patients with depression frequently do not adhere to medical recommendations for underlying medical conditions," the study authors noted. "It is therefore plausible that such undertreated conditions may affect postoperative care and outcomes. Second, patients with existing psychiatric comorbidity may be more likely to undergo surgery by a lower-quality surgeon or hospital. Third, pre-existing psychiatric comorbidity may serve as an indicator for greater severity of surgical risk."
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