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Postpartum depression and the new pope's lung: In health news today

The Conclave Of Cardinals Have Elected A New Pope To Lead The World's Catholics

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Pope Francis, pictured above just after being elected on Wednesday, had a lung removed as a teen due to infection. Forbes notes that people living with one lung are generally able lives that are as active and healthy as their two-lunged counterparts – assuming they stay healthy in other ways.

In today's health news:

While radiation can be an effective breast cancer treatment, it comes with side effects to the heart. ABCNews.com says the risk of cardiovascular disease in patients being treated for breast cancer rose by about 7 percent per unit of radiation exposure to the heart. Researchers said health providers ought to "consider cardiac dose and cardiac risk factors as well as tumor control" when considering whether to use radiation therapy in breast cancer patients.

As many as one in seven women experiences postpartum depression, which comes after having a baby, says a new study. NPR reports that among women who were monitored for one year after giving birth, more than one in five were depressed – some to the point of having suicidal thoughts.

Federal health officials recommend that children get at least an hour of physical activity every day, but that often doesn't happen. A new study in the American Journal of Preventive Medicine tries to help by outlining specific ways kids can change that, including walking or biking to school and after-school programs.

Gene therapy on mice may point the way to arthritis relief: HealthDay reports on a new study that found injecting mice with modified genes appeared to trigger a protein that helps lubricate the joints, which seemed to reduce the risk of the mice developing osteoarthritis.

Don't give healthy children medication for attention-deficit hyperactivity disorder (ADHD): That's the message of the American Academy of Neurology in a new report. CBSNews.com says the doctors call the prescribing of "neuroenhancements" unjustifiable, especially when they're used as "study drugs" among students cramming for class. That's in part because little is known about how safe the medications are in young people who don't have ADHD.

No one likes the thought of watching doctors try desperately to save a family member's life with CPR – but a new study suggests those doctors should actually be inviting a patient's family to watch. According to the Los Angeles Times, researchers found that families who watched as doctors performed CPR on a loved one are less likely to experience post-traumatic stress disorder.

Coronavirus, an often fatal SARS-like sickness which has recently emerged as a potential major threat, isn't curable right now. But HealthDay says new research has pinpointed the receptor the virus uses to invade healthy cells; if scientists figure out how to prevent coronavirus from binding to those receptors, thus entering the cell, they may be able to develop ways to combat the infection.

A new study appearing in JAMA Internal Medicine says that a quarter of the colonoscopies paid for by Medicare may be inappropriate under U.S. Preventive Services Task Force guidelines. The USPSTF says a colonoscopy is inappropriate, for one, if it's repeated within 10 years after a negative screening in an asymptomatic patient between 70 and 75 years old.

And finally, in papal health news: Newly elected Pope Francis had a lung removed as a teen due to an infection, and Forbes has more on what that could mean for the future health of the new pontiff.

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