Strokes linked to Depression: Study

Even though Depression is considered to be a common problem for people who have had a stroke, it is also noted that some people may have symptoms of depression years prior to their stroke, according to a study published in an online issue of Neurology, the medical journal of the American Academy of Neurology. Researchers found that, in people who developed a stroke, symptoms of depression preceded the onset of stroke and further worsened after the stroke.

Study author PhD Maria Blochl of the University of Munster in Germany, "Depression is among the most pressing problems in people who have had a stroke and it is so common it is referred to as post-stroke depression," "But our study found depressive symptoms not only markedly increase after stroke, it found people already had developed some depressive symptoms before the stroke even occurred."

Researchers looked at 10,797 adults with an average age of 65 and without a history of stroke at the start of the study. Participants were followed for up to 12 years, For the study. During that time, 425 people had a stroke. They were matched with 4,249 people who did not have a stroke but were similar in their age, gender, racial or ethnic identity, and other health conditions.

Participants took a survey every two years asking whether they experienced symptoms of depression in the past week, including feeling depressed; feeling lonely; feeling sad; everything was an effort; and restless sleep. The more symptoms participants had the higher their scores.

Researchers found that six years before the time of the stroke, people who later had a stroke and those who did not score roughly the same, about 1.6 points. But about two years before the stroke, scores of people who had a stroke started increasing, on average by 0.33 points. Following a stroke, depressive symptoms increased an additional 0.23 points for this group, reaching a total of about 2.1 points and they stayed that high for 10 years after the stroke. In contrast, the scores of people who did not have a stroke remained roughly the same throughout the study.

"This suggests that increasing symptoms of depression before stroke are mostly subtle changes and may not always be clinically detectable. But even slight increases in depressive symptoms, especially mood and fatigue-related symptoms, maybe a signal of a stroke that is about to occur," noted Blöchl.

"Depression is not only a post-stroke issue but also a pre-stroke phenomenon," said Blöchl. "Whether these pre-stroke changes can be used to predict who will have a stroke is unclear. Exactly why depressive symptoms occur pre-stroke needs to be investigated in future research. Also, the study underscores why doctors need to monitor for symptoms of depression long-term in people who have had strokes."

A limitation of the study was that researchers did not have enough data on treatments for depression. So, it is possible that some people received antidepressants that could have improved their symptoms of depression following stroke.

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