Young gay and bisexual men who use methamphetamine are more likely to take sexual risks that boost their chances of contracting HIV, a new study suggests.
Researchers say the findings underscore the fact that meth, and its associated HIV risk, is not just a problem of middle-aged white men.
Methamphetamine triggers a massive release of the feel-good chemical dopamine in the brain, making users feel disinhibited, energized -- and prone to sexual risk-taking.
Studies of gay and bisexual men have found that roughly 43 percent have ever used meth, and that the habit is strongly linked to their risk of contracting HIV, the virus that causes AIDS.
But much less has been known about meth use and HIV risk among teenagers and young men.
So for the new study, researchers surveyed 595 12- to 24-year-old gay and bisexual males from eight U.S. cities. They found that 31 percent had ever used hard drugs -- one-third of whom had used methamphetamine.
And young men who'd used meth were more likely to report a range of risk factors for HIV.
Nearly 86 percent said they'd had sex with at least two different partners in the past 90 days (versus 63 percent of non-drug users). Almost 52 percent had ever had sex with an injection-drug user (versus 11 percent), and one-third had had sex with someone who was HIV-positive (against 11 percent).
Despite all of that, meth users were less consistent with condoms: one-third said they used them every time they had sex, compared with 54 percent of young men who'd never used hard drugs.
"In many ways, these findings mirror what's been seen in older MSM (men who have sex with men)," said Dr. Robert Garofalo of Children's Memorial Hospital in Chicago.
That's concerning, he told Reuters Health in an interview, and it also points to a large public health need.
"There are not a lot of proven HIV prevention programs for this age group," Garofalo said. More programs, including ones that target meth abuse, need to be piloted, according to Garofalo and his colleagues.
"We shouldn't wait," he said. "This is a real public health crisis."
The findings, which appear in the Archives of Pediatrics & Adolescent Medicine, are not representative of all young gay and bisexual men in the U.S. The researchers recruited their participants from clubs, bars, parks and other urban venues where they might find higher-risk young men.
But the researchers also consider that a strong point of the study.
"It tells us something about where to find these young men, and where we might be able to run some type of intervention," said lead researcher Peter Freeman, who is also with Children's Memorial.
For parents and teenagers, he said, the findings highlight the importance of having open conversations about both drug use and risky sexual behavior.
Garofalo said there still may be many parents who do not know that methamphetamine is something they need to worry about. So the current findings may be something of an eye-opener for some, he added.
Finding effective ways to curb HIV risk among young gay and bisexual men will only become increasingly important, according to Garofalo and Freeman.
In 2004, Americans between the ages of 13 and 24 accounted for 13 percent of new HIV diagnoses.
And gay and bisexual males, especially minorities, have been particularly vulnerable. A study of seven cities by the U.S. Centers for Disease Control and Prevention found that 14 percent of African-American gay and bisexual males ages 15 to 22 had HIV. The same was true of 7 percent of Hispanics.
Sources : http://www.reuters.com/article/2011/08/03/us-gay-men-meth-risk-idUSTRE7726UR20110803
Thursday, August 4, 2011
Tuesday, August 2, 2011
Magnetic field exposure linked to asthma risk
Children whose mothers had high exposure to electromagnetic fields while pregnant may have an increased risk of developing asthma, U.S. researchers said on Monday in a study that adds to an ongoing debate.
Many prior studies have failed to consistently show that chronic exposure to electromagnetic fields -- from power lines and appliances such as microwaves ovens, hair dryers and vacuum cleaners -- are harmful to human health.
But many of these studies required people to estimate their exposure levels over several years, says Dr. De-Kun Li, senior research scientist at the Kaiser Permanente in Oakland, California, whose study appears in Archives of Pediatrics & Adolescent Medicine.
To get a more conclusive answer, Li designed a so-called prospective study in which 801 pregnant women wore monitors that measured their exposure to magnetic fields for 24 hours.
These monitors measured their exposure to low-frequency magnetic fields from electronics such as microwaves, hair dryers, fans, coffee grinders and fluorescent light bulbs, power lines, and transformer stations.
It did not monitor exposure to higher frequency electromagnetic fields generated by cellphones or cellphone towers.
The team used medical records to follow the women's children for 13 years. During the follow-up, 130 children, or 20.8 percent of study participants, developed asthma.
Most of these cases were diagnosed before age 5.
They then compared exposure levels during pregnancy to rates of asthma and found that children whose mothers had the highest exposure levels -- within the top 10 percent of women in the study -- were 3.5 times more likely to develop asthma than those who were in the bottom 10 percent.
The risk for children whose exposure was somewhere in the middle -- between 10 percent and 90 percent -- was 75 percent higher than for those in the lowest exposure group.
For the average population, Li said, children of women whose exposure levels were in the range of the bottom 10 percent in the study would have about a 13.6 percent absolute risk of developing asthma. Women whose exposure was in the highest range would have about a 33 percent risk of having children who developed asthma over the 13 year study period.
Some 13 percent of children under age 18 have asthma, which is caused by malfunction of the respiratory organs and the immune system.
Li said it is not clear why exposure to power lines might increase the risk of asthma, but he said there are several possibilities.
He said a prior study by his team found high exposure to electromagnetic fields increased the risk of miscarriages. And some animal studies have suggested that electromagnetic field exposure can affect immune response, which could increase the risk of asthma.
Exposure to power lines has been fodder for significant debate, and while many studies have found an effect of some sort -- ranging from immune disorders and poor semen quality to certain types of cancers -- Li said his study offers a stronger argument that concerns about magnetic fields may affect human health.
"This really needs to be studied," Li said. He said there have been a lot of dismissive attitudes about the health effects of exposure to magnetic fields, and he hopes his study -- which measured exposure levels ahead of time -- will encourage others to look further.
Still, he concedes that his findings need to be replicated by different scientists.
Li said if the findings are confirmed, it may offer new strategies for preventing the chronic disease in children.
Sources : http://www.reuters.com/article/2011/08/01/us-pregnancy-asthma-idUSTRE77066420110801
Many prior studies have failed to consistently show that chronic exposure to electromagnetic fields -- from power lines and appliances such as microwaves ovens, hair dryers and vacuum cleaners -- are harmful to human health.
But many of these studies required people to estimate their exposure levels over several years, says Dr. De-Kun Li, senior research scientist at the Kaiser Permanente in Oakland, California, whose study appears in Archives of Pediatrics & Adolescent Medicine.
To get a more conclusive answer, Li designed a so-called prospective study in which 801 pregnant women wore monitors that measured their exposure to magnetic fields for 24 hours.
These monitors measured their exposure to low-frequency magnetic fields from electronics such as microwaves, hair dryers, fans, coffee grinders and fluorescent light bulbs, power lines, and transformer stations.
It did not monitor exposure to higher frequency electromagnetic fields generated by cellphones or cellphone towers.
The team used medical records to follow the women's children for 13 years. During the follow-up, 130 children, or 20.8 percent of study participants, developed asthma.
Most of these cases were diagnosed before age 5.
They then compared exposure levels during pregnancy to rates of asthma and found that children whose mothers had the highest exposure levels -- within the top 10 percent of women in the study -- were 3.5 times more likely to develop asthma than those who were in the bottom 10 percent.
The risk for children whose exposure was somewhere in the middle -- between 10 percent and 90 percent -- was 75 percent higher than for those in the lowest exposure group.
For the average population, Li said, children of women whose exposure levels were in the range of the bottom 10 percent in the study would have about a 13.6 percent absolute risk of developing asthma. Women whose exposure was in the highest range would have about a 33 percent risk of having children who developed asthma over the 13 year study period.
Some 13 percent of children under age 18 have asthma, which is caused by malfunction of the respiratory organs and the immune system.
Li said it is not clear why exposure to power lines might increase the risk of asthma, but he said there are several possibilities.
He said a prior study by his team found high exposure to electromagnetic fields increased the risk of miscarriages. And some animal studies have suggested that electromagnetic field exposure can affect immune response, which could increase the risk of asthma.
Exposure to power lines has been fodder for significant debate, and while many studies have found an effect of some sort -- ranging from immune disorders and poor semen quality to certain types of cancers -- Li said his study offers a stronger argument that concerns about magnetic fields may affect human health.
"This really needs to be studied," Li said. He said there have been a lot of dismissive attitudes about the health effects of exposure to magnetic fields, and he hopes his study -- which measured exposure levels ahead of time -- will encourage others to look further.
Still, he concedes that his findings need to be replicated by different scientists.
Li said if the findings are confirmed, it may offer new strategies for preventing the chronic disease in children.
Sources : http://www.reuters.com/article/2011/08/01/us-pregnancy-asthma-idUSTRE77066420110801
Acute-care hospitals to see higher Medicare payments
The U.S. government announced an increase in reimbursement rates to acute-care hospitals for 2012, a sharp contrast to the cut it announced for skilled nursing facilities on Friday.
The Centers for Medicare and Medicaid Services (CMS) increased payment rates to acute-care hospitals by 1 percent, compared with a 0.5 percent cut it had proposed earlier.
The CMS expects the rate increase will result in Medicare's operating payments to acute-care hospitals rising by $1.13 billion, or 1.1 percent.
On Friday, the CMS cut 2012 payments for skilled nursing facilities by 11.1 percent, or $3.87 billion, leading to a sharp decline in shares of Skilled Healthcare, Kindred Healthcare and Sun Health Care.
There was a broad sell-off in healthcare stocks on Monday on fears that the debt-ceiling deal to be voted on by the U.S. Congress would cut healthcare spending for federal programs such as Medicare.
Acute-care hospital operators such as HealthSouth Corp, Kindred Healthcare Inc, Tenet Healthcare Corp and Community Health Systems Inc are expected to benefit from the hike in payment rate.
Sources : http://www.reuters.com/article/2011/08/01/us-acutecarehospitals-idUSTRE77062U20110801
The Centers for Medicare and Medicaid Services (CMS) increased payment rates to acute-care hospitals by 1 percent, compared with a 0.5 percent cut it had proposed earlier.
The CMS expects the rate increase will result in Medicare's operating payments to acute-care hospitals rising by $1.13 billion, or 1.1 percent.
On Friday, the CMS cut 2012 payments for skilled nursing facilities by 11.1 percent, or $3.87 billion, leading to a sharp decline in shares of Skilled Healthcare, Kindred Healthcare and Sun Health Care.
There was a broad sell-off in healthcare stocks on Monday on fears that the debt-ceiling deal to be voted on by the U.S. Congress would cut healthcare spending for federal programs such as Medicare.
Acute-care hospital operators such as HealthSouth Corp, Kindred Healthcare Inc, Tenet Healthcare Corp and Community Health Systems Inc are expected to benefit from the hike in payment rate.
Sources : http://www.reuters.com/article/2011/08/01/us-acutecarehospitals-idUSTRE77062U20110801
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