Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

UCLA study finds endocrine disorder is most common cause of elevated calcium levels

22.02.2013
Hyperparathyroidism occurs most often in older African American women

Unusually high calcium levels in the blood can almost always be traced to primary hyperparathyroidism, an undertreated, underreported condition that affects mainly women and the elderly, according to a new study by UCLA researchers.

The condition, which results from overactive parathyroid glands and includes symptoms of bone loss, depression and fatigue that may go undetected for years, is most often seen in African American women over the age of 50, the researchers discovered.

The study, currently online in the Journal of Clinical Endocrinology and Metabolism, is one of the first to examine a large, racially and ethnically diverse population — in this case, one that was 65 percent non-white. Previous studies had focused on smaller, primarily Caucasian populations.

The four parathyroid glands, which are located in the neck, next to the thyroid, regulate the body's calcium levels. When one is dysfunctional, it can cause major imbalances — for example, by releasing calcium from the bones and into the bloodstream. Over time, calcium loss from bones often leads to osteoporosis and fractures, and excessive calcium levels in the blood can cause kidney stones and worsening kidney function.

The UCLA researchers determined that hyperparathyroidism is the leading cause of high blood-calcium levels and is responsible for nearly 90 percent of all cases.

"The findings suggest that hyperparathyroidism is the predominant cause of high calcium levels, so if patients find they have high calcium, they should also have their parathyroid hormone level checked," said the study's lead author, Dr. Michael W. Yeh, an associate professor of surgery and endocrinology at the David Geffen School of Medicine at UCLA.

Hyperparathyroidism, which affects approximately 1 percent of the population, can be detected by measuring parathyroid hormone levels to determine if they are elevated or abnormal.

For the study, researchers utilized a patient database from Kaiser Permanente Southern California that included information on 3.5 million individuals, a population roughly the size of Ohio. Using data from lab results, the research team identified 15,234 cases of chronic high-calcium levels. Of those cases, 13,327 patients (87 percent) were found to have hyperparathyroidism.

The incidence of hyperparathyroidism — reported as the number of cases per 100,000 people per year — was found to be highest among African Americans (92 women and 46 men), followed by Caucasians (81 women and 29 men), Asians (52 women, 28 men) and Hispanics (49 women and 17 men).

The research team also found that with advancing age, the incidence of hyperparathyroidism (per 100,000 people per year) increased and that more women were affected:

Under age 50: 12 to 24 cases for both genders
Ages 50: 80 women and 36 men
Ages 70: 196 women and 95 men
"It was surprising to find the highest incidence in black women over age 50," Yeh said. "We had traditionally thought of the disorder as affecting mostly Caucasian women."

However, since black women tend to have stronger bones and fewer fractures, more study is needed to see how the disorder is manifested in this patient group. African American women's physiology may be different and more protective of calcium and bone, Yeh said.

Yeh also noted that further study of the disorder may result in new, more targeted treatment guidelines based on racial differences. African American women, for instance, may require less vitamin D than is commonly prescribed to protect bone health, he said.

In the study, the researchers also found that the prevalence of hyperparathyroidism has tripled in the last 10 years, increasing from 76 women to 233 (out of 100,000) and from 30 men to 85.

The researchers noted that the growing prevalence is likely due to increased calcium testing, annual lab tests to monitor patients with symptoms and the low rate of surgery to treat the disorder. Previous research has shown that only 28 percent of patients with hyperparathyroidism undergo surgery to remove the overactive parathyroid gland — the most reliable way to correct the disorder.

"Women can suffer for years with hyperparathyroidism and not know they have it, which is especially critical in midlife, when bone health is so important," Yeh said. "Appropriate management of the disorder is essential. Surgery should be considered in the majority of people with primary hyperparathyroidism."

The next step, Yeh said, is further study of this patient population to examine the long-term impact of the condition on bone health and the effectiveness of different management strategies on outcomes.

"We are aiming to better understand how hyperparathyroidism affects people of different racial backgrounds," he said.

The study was funded with support from the Earl Gales Family Foundation, the National Institute on Aging and the American Geriatrics Society.

Additional authors include Philip H.G. Ituarte, Ph.D., Stacie Nishimoto and Dr. Avital Harari of the section of endocrine surgery at the David Geffen School of Medicine at UCLA; Hui Cynthia Zhou, In-Lu Amy Liu and Annette L. Adams, Ph.D., of the department of research and evaluation at Kaiser Permanente Southern California; and Dr. Philip I. Haigh of the department of surgery at Kaiser Permanente Los Angeles Medical Center.

For more news, visit the UCLA Newsroom and follow us on Twitter.

Rachel Champeau | EurekAlert!
Further information:
http://www.mednet.ucla.edu

More articles from Health and Medicine:

nachricht Oxygen can wake up dormant bacteria for antibiotic attacks
08.12.2016 | Penn State

nachricht NTU scientists build new ultrasound device using 3-D printing technology
07.12.2016 | Nanyang Technological University

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Closing the carbon loop

08.12.2016 | Life Sciences

Applicability of dynamic facilitation theory to binary hard disk systems

08.12.2016 | Physics and Astronomy

Scientists track chemical and structural evolution of catalytic nanoparticles in 3-D

08.12.2016 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>