http://online.wsj.com/article/SB125081705506548241.html

WASHINGTON – Severe depression may silently break a seemingly healthy woman’s heart. Doctors have long known that depression is common after a heart attack or stroke, and worsens those people’s outcomes. Monday, Columbia University researchers reported new evidence that depression can lead to heart disease in the first place.

The scientists tracked 63,000 women from the long-running Nurses’ Health Study between 1992 and 2004. None had signs of heart disease when the study began, but nearly 8 percent had evidence of serious depression.

The depressed women were more than twice as likely to experience sudden cardiac death — death typically caused by an irregular heartbeat, concluded the 12-year study, published Monday in the Journal of the American College of Cardiology. They also had a smaller increased risk of death from other forms of heart disease.

The big surprise: Sudden cardiac death seemed more closely linked with antidepressant use than with the depression symptoms the women reported.

That might simply mean that women who used antidepressants were, appropriately, the most seriously depressed, cautioned lead researcher Dr. William Whang. But he said the finding merited more research.

Studies of the newer antidepressants most often used today so far haven’t signaled a risk of irregular heartbeat, and some even have suggested protection, noted Dr. Redford Williams of Duke University, a specialist in how psychosocial factors affect health.

The drug question aside, Williams said the work adds to growing evidence that depression is an independent risk factor for heart disease — on top of the classic risks of high blood pressure, diabetes, high cholesterol and smoking.

The predominantly white Nurses’ Health Study may underestimate it, Williams said. “If anything, the impact in African-American women is probably greater,” he said, adding that it’s time for the next step: A study testing whether properly treating depression lowers the risk.

Why might depression have that effect? The study found that the more severe the women’s reported depression symptoms, the more likely she was to have traditional heart risk factors. Also, stresses like depression have been linked to such physical effects as a higher resting heart rate.

Perhaps a more straightforward reason: Depression can make people do a worse job taking care of themselves. Indeed, the American Heart Association last year recommended that everyone who already has heart disease be regularly screened for depression — because depressed patients may skip their medications, sit indoors instead of exercising, and eat particularly poorly.

Lengthy television viewing in adolescence may raise the risk for depression in young adulthood, according to a new report.

The study, published in the February issue of The Archives of General Psychiatry, found a rising risk of depressive symptoms with increasing hours spent watching television. There was no association of depression with exposure to computer games, videocassettes or radio.

Researchers used data from a larger analysis of 4,142 adolescents who were not depressed at the start of the study. After seven years of follow-up, more than 7 percent had symptoms of depression. But while about 6 percent of those who watched under three hours a day were depressed, more than 17 percent of those who watched more than nine hours a day had depressive symptoms.

The association was stronger in boys than in girls, and it held after adjusting for age, race, socioeconomic status and educational level.

“We really don’t know what it was specifically about TV exposure that was associated with depression, whether it was a particular kind of programming or some contextual factor such as watching alone or with other people,” said Dr. Brian Primack, the lead author and an assistant professor of medicine at the University of Pittsburgh. “Therefore, I would be uneasy to make any blanket recommendations based on this one study.”