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Long-term depression may double stroke risk despite treatment

Date:
May 13, 2015
Source:
American Heart Association
Summary:
Long-term depression may double the risk of stroke for middle-aged adults, research suggests. The scientists add that reducing symptoms of depression may not immediately reduce the elevated stroke risk.
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Previous research has shown that depression is associated with an increased risk of high blood pressure, abnormalities of the autonomic nervous system and increased inflammatory responses.
Credit: copyright American Heart Association

Persistent depression may double the risk of stroke in adults over 50 -- and stroke risk remains higher even after symptoms of depression go away, according to research in the Journal of the American Heart Association.

"Our findings suggest that depression may increase stroke risk over the long term," said Paola Gilsanz, Sc.D., study lead author and Yerby Postdoctoral Research Fellow at Harvard University's T.H. Chan School of Public Health in Boston, Mass.

Researchers used data from 16,178 participants (ages 50 and older) who had been interviewed as part of the Health and Retirement Study about depressive symptoms, history of stroke, and stroke risk factors every two years in 1998-2010.

The study documented 1,192 strokes over 12 years. Compared to people without depression at either interview:

  • People with high depressive symptoms at two consecutive interviews were more than twice as likely to have a first stroke.
  • People who had depressive symptoms at the first interview but not the second had a 66 percent higher stroke risk.

Researchers did not evaluate whether depressive symptoms diminished because of treatment or for other reasons; but findings suggest that treatment, even if effective for depression, may not have immediate benefits for stroke risk. Researchers also suggest that diminished depression may have a stronger effect on women than men. However, recent onset of depression was not associated with higher stroke risk.

"Looking at how changes in depressive symptoms over time may be associated with strokes allowed us to see if the risk of stroke increases after elevated depressive symptoms start or if risk goes away when depressive symptoms do," Gilsanz said. "We were surprised that changes in depressive symptoms seem to take more than two years to protect against or elevate stroke risk."

Previous research has shown that depression is associated with an increased risk of high blood pressure, abnormalities of the autonomic nervous system and increased inflammatory responses. Depression might trigger underlying vascular problems, including infection or atrial fibrillation, and depressed people are also more likely to smoke and be less physically active.

"Although we now know that depression strongly predicts stroke on par with many other major stroke risk factors, we still need research to understand exactly why this link occurs and whether we can potentially reduce stroke risk by treating depression," said Maria Glymour, Sc.D., study senior author and an associate professor of epidemiology and biostatistics at the University of California, San Francisco School of Medicine.


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Materials provided by American Heart Association. Note: Content may be edited for style and length.


Journal Reference:

  1. Paola Gilsanz, Stefan Walter, Eric J. Tchetgen Tchetgen, Kristen K. Patton, J. Robin Moon, Benjamin D. Capistrant, Jessica R. Marden, Laura D. Kubzansky, Ichiro Kawachi, and M. Maria Glymour. Changes in Depressive Symptoms and Incidence of First Stroke Among Middle‐Aged and Older US Adults. Journal of the American Heart Association, May 2015 DOI: 10.1161/JAHA.115.001923

Cite This Page:

American Heart Association. "Long-term depression may double stroke risk despite treatment." ScienceDaily. ScienceDaily, 13 May 2015. <www.sciencedaily.com/releases/2015/05/150513210740.htm>.
American Heart Association. (2015, May 13). Long-term depression may double stroke risk despite treatment. ScienceDaily. Retrieved May 22, 2017 from www.sciencedaily.com/releases/2015/05/150513210740.htm
American Heart Association. "Long-term depression may double stroke risk despite treatment." ScienceDaily. www.sciencedaily.com/releases/2015/05/150513210740.htm (accessed May 22, 2017).

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