About 400,000 coronary artery bypass graft surgeries are performed in the U.S. each year, and roughly one in five patients goes on to experience clinical depression. But all that could change because of a telephone.

According to University of Pittsburgh researchers, monitoring patient depression and administering a nurse-led intervention via a phone call bi-weekly not only improves quality of life and mood, but it’s also cost-effective and cost-saving.

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As soon as the clocks change each fall, do you feel like your body goes into hibernation mode?

When winter mood shifts bring us to the point of depression, the experience is called Seasonal Affective Disorder, also known as S.A.D., and the mental health effects can be devastating for some people.

Kathryn Roecklein, Assistant professor in the University of Pittsburgh Department of Psychology and Center for the Neural Basis of Cognition at Pitt and CMU studies and treats S.A.D.

She says, contrary to what some people think, S.A.D. is not a response to cold weather, but the shorter days of winter and lack of sunlight.

This is often called “the most wonderful time of the year,” but for many it’s one of the toughest times of the year, thanks to depression. There are several types of depression, including major depressive disorder, or what is more commonly known as clinical depression.

“It’s a mood state that lasts for an extended period of time and to a degree of severity that really interferes with a person’s usual functioning,” said Edward Friedman, a psychiatrist with UPMC. “That’s kind of different from holiday blues or seasonal blues.”

A recent study published in the British Journal of Psychiatry used brain scans to measure blood flow to parts of the brain associated with emotion regulation to gauge if the subjects had unipolar depression or bipolar disorder.

The study hoped to identify brain function markers that identified the two types of depression.

The study used 44 Pittsburgh-area women and was conducted by researchers from the University of Pittsburgh, Kings College London, the University of South Florida and the University of Texas Southwestern.