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Study: 1/3 of knee replacements are questionable
June 30th, 2014
03:34 PM ET

Study: 1/3 of knee replacements are questionable

Whether to replace aging knees can be a tough decision. More than 650,000 Americans underwent total knee replacement surgery last year, but a new paper from researchers at Virginia Commonwealth University suggests that a third of those were not “appropriate,” based on standard medical criteria.

The study authors analyzed 175 cases, looking at imaging tests to find the degree of arthritis, as well as each patient’s age and reported pain level. Only 44% of the operations were rated “appropriate.” Thirty-four percent were “inappropriate,” while 22% were inconclusive.

But appropriateness is in the eye of the beholder, says Dr. Jeffery Katz, an orthopedic surgeon at Brigham and Women’s Hospital in Boston. When the current criteria were developed in the late 1990s, knee replacement “was considered a treatment of last resort,” Katz writes in an editorial published alongside the study in the Journal of Arthritis and Rheumatism. Today, many are being done in relatively healthy people in their 50s and 60s.
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Have you had the 'sext' talk with your kids?
June 30th, 2014
01:33 PM ET

Have you had the 'sext' talk with your kids?

It’s called sexting, the act of sending and/or receiving sexually explicit text or photo messages via your mobile phone. And one in five middle school-aged students are doing it, according to a new study published in the medical journal Pediatrics.

Among the 1,285 Los Angeles students aged 10 to 15 surveyed for the study, 20% reported having received at least one sext, while 5% reported having sent at least one sext.

“Very frequently it’s the image or the sex, that is finding its way to the middle schooler first, prior to any sort of conversation or education" by parents, said Ian Kerner, a sexuality counselor and father to two boys. "That makes it even more confusing (for kids).”

The study authors also looked at how sexting relates to sexual behavior among these adolescents. The survey showed that those who reported receiving a sext, were six times more likely to report being sexually active than teens who hadn't received a sext. Those who sent a sext were about 4 times more likely to report being sexually active.
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5 studies you may have missed
Eating more fruits and vegetables won't help you lose weight if you don't reduce the number of calories you're eating overall.
June 27th, 2014
12:39 PM ET

5 studies you may have missed

Here's a roundup of five medical studies published this week that might give you new insights into your health, mind and body. Remember, correlation is not causation – so if a study finds a connection between two things, it doesn't mean that one causes the other.

Eating more fruits and veggies won’t make you lose weight
American Journal of Clinical Nutrition

We’re often told to eat more fruits and vegetables, but the chances that you’ll lose weight just by eating more of these foods are slim. New research suggests increased fruit and vegetable intake is only effective for weight loss if you make an effort to reduce your calorie intake overall.

In other words, you need to exercise or consume fewer calories to shed those pounds.
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How reliable is the drug info you find online?
June 26th, 2014
08:04 AM ET

How reliable is the drug info you find online?

When people want to learn more about a new drug warning, they turn to the internet - that’s no surprise. But is the information they find there accurate and up-to-date? Not always, according to a report published in the New England Journal of Medicine this week.

“Despite debates over its credibility, Wikipedia is reportedly the most frequently consulted online health care resource globally,” the authors write. “Wikipedia pages typically appear among the top few Google search results and are among the references most likely to be checked by internet users.”

Wikipedia, along with Google and WebMD, is where more than half of all Americans turn to for health information, according to the report.

Researchers found that when the FDA issues a drug safety warning, Google searches about that drug increase 82% on average in the following week. Wikipedia pages about the drug see a 175% increase in views on the day of the announcement.

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June 24th, 2014
06:14 PM ET

Do I need a 3-D mammogram?

Digital breast tomosynthesis, better known as 3-D mammography, can find more invasive, and in some cases more dangerous, cancers than a traditional digital mammogram, a new study published in the Journal of the American Medical Association this week concludes.

But do you need one?

Approved by the Food and Drug Administration in 2011 as a supplement to digital mammography, tomosynthesis creates a 3-D reconstruction of the breast tissue, giving radiologists a clearer view of overlapping slices. This new study found using the combination of digital and 3-D mammography reduces false alarms and unnecessary call backs by 15% in all groups of patients, including younger women and women with dense breast tissue.

The study was funded by Hologic, the manufacturer of the 3-D imaging machine, and the National Cancer Institute.
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Pesticide exposure during pregnancy may increase autism risk
June 24th, 2014
02:36 PM ET

Pesticide exposure during pregnancy may increase autism risk

Scientists have long hypothesized that chemicals found in our environment play a role in causing autism. Research published this week in Environmental Health Perspectives supports that theory, finding children whose mothers are exposed to agricultural pesticides during pregnancy may be at increased risk for autism spectrum disorders, or ASD.

Researchers at the University of California, Davis, looked at the medical records of 970 participants. They found pregnant women who lived within a mile of an area treated with three different types of pesticides were at a two-thirds higher risk of having a child with ASD or developmental delays. These pesticide-treated areas included parks, golf courses, pastures and roadsides.

The study investigated the use of three classes of pesticides: organophosphates, which include the widely used insecticide chlorpyrifos, as well as pyrtheroids and carbamates.
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Filed under: Autism • Conditions • Environment • Pregnancy

5 studies you may have missed
Food trucks are generally as safe or safer than restaurants, a new study found.
June 20th, 2014
03:05 PM ET

5 studies you may have missed

Here's a roundup of five medical studies published this week that might give you new insights into your health, mind and body. Remember, correlation is not causation – so if a study finds a connection between two things, it doesn't mean that one causes the other.

You are the (Facebook) company you keep
Journal: PNAS

It may be time to think twice before accepting that friend request on Facebook. A new study by scientists at Cornell University and Facebook suggests that emotions can be spread via Facebook and other social networks. Yes, you read that right: Your Facebook posts are contagious. The scientists looked at 3 million Facebook posts from a group of 155,000 randomly selected users.

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Depression a 'powerful' risk factor for heart disease in young women
June 19th, 2014
08:54 AM ET

Depression a 'powerful' risk factor for heart disease in young women

Young women are twice as likely to suffer a heart attack or die of heart disease if they suffer from depression, a new study suggests.

Researchers looked at 3,237 patients with suspected or established heart disease who were undergoing coronary angiography – a medical procedure used to diagnose narrowing in the arteries that supply blood to the heart. On the same day of the procedure, the patients answered nine questions assessing their state of mind.

If the patient was experiencing moderate to severe depression, and was under 55 years old, researchers found she had double the chance of experiencing a heart attack in the next few years. Depressed women under 55 were also twice as likely to have heart disease or to die from any cause during that time period than those who were not depressed. Men and those women older than 55 with depression did not show the same increased risk.

Depression is as powerful a risk factor for heart disease as diabetes and smoking, study author Dr. Amit Shah, a cardiologist at Emory University in Atlanta, concluded.
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Filed under: Conditions • Depression • Heart • Mental Health

Sitting too long may increase your cancer risk
June 17th, 2014
10:49 AM ET

Sitting too long may increase your cancer risk

If you’re spending a lot of time sitting every day, either in front of the TV or at work, you may be at higher risk for developing certain types of cancer, according to new research published this week in the Journal of the National Cancer Institute.

The study found an additional two hours a day of sedentary behavior was linked to an 8% increase in colon cancer risk, a 10% increase in endometrial cancer risk and a 6% increase in risk for lung cancer. It did not find the same connection for breast, rectum, ovary and prostate cancers or for non-Hodgkin lymphoma.

Researchers came to these conclusions by analyzing 43 existing studies that included more than 4 million study participants and 68,936 cancer cases to measure the relationship between hours spent sitting and certain types of cancers.
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June 13th, 2014
12:01 AM ET

5 studies you may have missed

Here's a roundup of five medical studies published this week that might give you new insights into your health, mind and body. Remember, correlation is not causation – so if a study finds a connection between two things, it doesn't mean that one causes the other.

Keep your phone out of your pocket – your sperm will thank you
Journal: Environmental International

Since guys don’t usually carry handbags, they tend to keep mobile phones in their pants pockets. A recent study from the University of Exeter suggests this may not be a great idea.

That cell phone could actually have a negative effect on your sperm quality.
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Filed under: Aging • Brain • Cell Phones • Conditions • Dental health • Diet and Fitness • Fertility • Heart • Living Well • Men's Health • Mental Health

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About this blog

Get a behind-the-scenes look at the latest stories from CNN Chief Medical Correspondent, Dr. Sanjay Gupta, Senior Medical Correspondent Elizabeth Cohen and the CNN Medical Unit producers. They'll share news and views on health and medical trends - info that will help you take better care of yourself and the people you love.

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