Navigation Links
High hormone levels put young black males at risk for cardiovascular disease
Date:12/7/2012

AUGUSTA, Ga. Increased levels of the hormone aldosterone in young black males correlate with an unhealthy chain of events that starts with retaining too much salt and results in an enlarged heart muscle, researchers say.

The findings indicate physicians may want to reach for aldosterone inhibitors early in their effort to control blood pressure and reduce cardiovascular risk in young black males.

Their studies of a cohort of 191 healthy black and white 15- to 19-year-olds showed that only in the black males was higher aldosterone associated with impaired sodium excretion, increased blood pressure and enlargement of the left pumping chamber of the heart, said Dr. Gregory A. Harshfield, hypertension researcher at the Medical College of Georgia and Institute of Public and Preventive Health at Georgia Health Sciences University.

"It's a clear pathway and is consistent with the idea that is the highest risk group for developing earlier and more severe cases of hypertension," Harshfield said. Increased sodium makes the body hold onto more fluid, which increases blood pressure. Unhealthy enlargement of the pumping chamber of the heart, called left ventricular hypertrophy, results from the heart having to work too hard against high blood pressures to push blood and oxygen out to the body. Harshfield's studies have shown that black males particularly have a problem with blood pressure returning to normal following stress because of an impaired ability to eliminate sodium.

"It might be a good idea to consider early on drugs that target aldosterone in these individuals," said Diana G. Murro, a fourth-year student at MCG and first author of the study in the journal Pediatric Nephrology. While aldosterone inhibitors are used to treat refractory hypertension, they typically are not used in blacks, possibly because they haven't been well studied in that population, Harshfield said.

The steroid hormone aldosterone, produced by the adrenal gland, is part of a renin-angiotensin-aldosterone system that helps the body regulate blood pressure and sodium retention. Aldosterone acts on the kidneys, prompting them to hold onto sodium which increases blood pressure. While that can be an asset in some finite scenarios, such as having limited access to water over an extended period, it can become a major health liability in the everyday world where you can consume a day's sodium requirement in single pack of crackers, Murro said.

Each of the other subgroups of young, healthy individuals actually showed some negative impact from higher aldosterone. In white and black females, it correlated with higher baseline blood pressures. In fact, white females had the highest aldosterone levels. In white males, it correlated with reduced sodium excretion. "It was more like we had a piece of the puzzle but not the whole puzzle like we did in the black males," Murro said.

Still, all the findings were concerning, Harshfield said. "This is a normal, healthy group of young people and we are already seeing these associations."

Interestingly, only 16 of the study participants were obese, and there was no significant correlation between obesity a major contributor to hypertension and heart disease and higher aldosterone.

Similar studies are needed in hypertensive youth or those with a family history of high blood pressure to see if their findings hold, the researchers said. One of the newer, more selective aldosterone blockers, eplerenone, has proven more effective than the angiotensin II receptor blocker losartan at treating hypertension in a predominantly black, adult male population. While angiotensin is a precursor for aldosterone, at least one study indicates it's not very effective at directly suppressing aldosterone.

Fewer than half of hypertensive Americans have their blood pressure under control, according to the Centers for Disease Control and Prevention. The MCG research was funded by the National Institutes of Health. Murro worked with Harshfield as a member of the inaugural GHSU Child Health Discovery Institute Summer Scholars Program.


'/>"/>
Contact: Toni Baker
tbaker@georgiahealth.edu
706-721-4421
Georgia Health Sciences University
Source:Eurekalert  

Related medicine news :

1. Could Hormone Spray Help Men Stay, Not Stray?
2. Feel-good hormone helps to jog the memory
3. Pregnancy Hormone Shows Promise as Heart Failure Drug
4. Metabolic syndrome makes a difference in hormone therapy risk
5. Hormone Replacement Therapy: Safe or Not?
6. Mild increases in thyroid-stimulating hormone not harmful in the elderly
7. Role of hormones, potential new treatments topic of UH lecture
8. Taking Breaks From Prostate Cancer Hormone Therapy Seems Safe: Study
9. Hormone acting drugs + uterine artery embolization offers nonsurgical treatment for uterine fibroids
10. Hormone May Boost Aging, Failing Brains
11. Force of habit: Stress hormones switch off areas of the brain for goal-directed behaviour
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
High hormone levels put young black males at risk for cardiovascular disease
(Date:10/13/2017)... ... October 13, 2017 , ... As health professionals work to improve ... engagement.” The patient is doing more than filling out a survey; in many cases ... an increasing emphasis in health care and research on the importance of active engagement ...
(Date:10/13/2017)... Ky. (PRWEB) , ... October 13, 2017 , ... The ... MPH to become its next President and Chief Executive Officer, succeeding Dr. James C. ... CEO Elect beginning July 1, 2018 until Dr. Puffer’s retirement at the end of ...
(Date:10/13/2017)... ... October 13, 2017 , ... PurhealthRX , a leading Health ... technology. Applying the Purzorb™process to full spectrum CBD oil will revolutionize the rapidly growing ... form that can be easily incorporated into liquid products, while reducing costs to end ...
(Date:10/13/2017)... QUEENS, N.Y (PRWEB) , ... October 13, 2017 , ... ... recently became a member of ElderCounsel, a national organization of elder law and special ... constantly changing laws and rules. It also provides a forum to network with elder ...
(Date:10/13/2017)... OBISPO, Calif. (PRWEB) , ... October 13, 2017 , ... ... or dementia. However, many long-term care insurance companies have a waiver for care if ... the 90-day elimination period, when the family pays for care, is often waived, so ...
Breaking Medicine News(10 mins):
(Date:10/11/2017)... 11, 2017  Caris Life Sciences ® , a ... promise of precision medicine, today announced that St. Jude ... Oncology Alliance™ (POA) as its 17 th member. ... Jude Crosson Cancer Institute will help develop standards of ... tumor profiling, making cancer treatment more precise and effective. ...
(Date:10/10/2017)... EXTON, Pa. , Oct. 10, 2017   ... leader in innovative solutions for injectable drug administration, today ... of West,s ID Adapter for improving the intradermal administration ... the Fourth Skin Vaccination Summit in May 2017 by ... Team Lead, Polio Department, World Health Organization (WHO), and ...
(Date:10/4/2017)... -- According to the Centers for Disease Control and Prevention (CDC), influenza ... Care is helping communities across Massachusetts , ... no-cost* flu shots through the end of the month. *Some ... ... flu shot is by the end of October, according to the Centers ...
Breaking Medicine Technology: