Friday, January 27, 2023

KIMM develops the world’s first electrode design for lithium-ion battery that improves smartphone·laptop battery performance

KIMM announces the development of lithium-ion battery with high-performance and reliability using bilayer electrodes,The new battery is expected to improve the performance and lifespan of electric vehicles and other electronic devices

Peer-Reviewed Publication

NATIONAL RESEARCH COUNCIL OF SCIENCE & TECHNOLOGY

Photos of research achievements 

IMAGE: ELECTRODE (ANODE) WITH A GROOVED, PATTERNED BILAYER STRUCTURE view more 

CREDIT: KOREA INSTITUTE OF MACHINERY AND MATERIALS (KIMM)

KIMM has announced the development of the design and process technology for the world's first battery electrode that significantly improves the performance and stability of batteries used in electronic devices such as smartphones, laptops, and electric vehicles.

A joint research team led by principal researcher Seungmin Hyun of the Department of Nano-Mechanics at the Korea Institute of Machinery and Materials (President Sang-jin Park, hereinafter referred to as KIMM), an institution under the jurisdiction of the Ministry of Science and ICT, and Professor Hoo-jeong Lee of Sungkyunkwan University (President Ji-beom Yoo, hereinafter referred to as SKKU) have developed a new battery technology that uses an electrode (Anode) structure that enhances the reliability and performance of traditional lithium-ion batteries. The results of their research achievement were published in the leading journal Advanced Functional Materials (IF: 19.924)*.

*Publication title: Design Strategies toward High-Performance Hybrid Carbon Bilayer Anode for Improved Ion Transport and Reaction Stability (Publication date: 2022.11.10)

In order to develop a design and process technology that maintains high performance and reliability even when the electrode of the lithium-ion battery is thick, the KIMM-SKKU joint research team formed a bilayered anode. Additionally, the anode is designed with grooves allowing small materials with improved ion conductivity and electrical conductivity to be placed between high-capacity materials

In general, lithium-ion battery electrodes are manufactured by coating and drying a slurry* so that it can be evenly distributed over the entire electrode. As such, it is the uniformity of the slurry that determines the performance of battery. The thicker the electrode, the lower the energy density and uniformity, making it difficult to maintain performance in a high-power environment.

*Slurry: A mixture of solids and liquids. Specifically, this refers to a mixture of active materials that chemically react to generate electrical energy when a battery is discharged, binders that are added for the structural stabilization of electrodes, and conductive materials that are added to improve electric conductivity.

However, with the anode structure of this newly developed battery. Uniform reaction stability can be achieved while maintaining high energy density throughout the electrode, even if the electrode is thick. This is particularly helpful in improving the performance and lifespan of batteries.

Principal researcher Seungmin Hyun stated that this achievement is an efficient method to improve the performance and lifespan of batteries by applying a new design to traditional lithium-ion battery materials and processes. He added that the team will continue to make efforts to apply this new technology to electric vehicles and soft robots that require high energy density in high-power environments, as well as to electronic devices such as commercial smartphones and laptops.

This research study was carried out with the support of the Nano and Material Technology Development Project (No. 2021M3H4A1A02099352) from the Ministry of Science and ICT, and with the support of the Nano-based Omni-TEX Manufacturing Technology Development Project from KIMM.

A Bilayer Electrode battery in pouch form

CREDIT  Korea Institute of Machinery and Materials (KIMM)

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The Korea Institute of Machinery and Materials (KIMM) is a non-profit government-funded research institute under the Ministry of Science and ICT. Since its foundation in 1976, KIMM is contributing to economic growth of the nation by performing R&D on key technologies in machinery and materials, conducting reliability test evaluation, and commercializing the developed products and technologies.

 

This research study was carried out with the support of the Nano and Material Technology Development Project (No. 2021M3H4A1A02099352) from the Ministry of Science and ICT, and with the support of the Nano-based Omni-TEX Manufacturing Technology Development Project from KIMM.

New study debunks the assumption that menstrual cycles disqualify women from exercise research

Women are routinely excluded from exercise research; study shows why that's misguided

Peer-Reviewed Publication

BRIGHAM YOUNG UNIVERSITY

Peruse any women’s magazine, and you’ll likely find advice on how to boost workouts. But what many don’t realize is that the research behind most exercise advice is based almost entirely on men. Female subjects are excluded from over 90% of studies on exercise performance and fatigability because hormonal changes during the menstrual cycle were thought to affect exercise capability — which, if true, could muddy the data, making women’s inclusion in the research too complicated.

A new study from Brigham Young University researchers, published in the Journal of Applied Physiology, shows why that assumption is misguided. Analyzing women’s exercise performance across their menstrual cycles, researchers found no variability in endurance thresholds or performance: from workout to workout, women’s performance was just as consistent as men’s.

“Females with regular cycles performed the same between the high-estrogen phase, the high-progesterone phase and during menstruation, when there are low concentrations of both,” said Jessica Linde, who led the study for her BYU Master’s thesis in exercise science. “That information lifts a big barrier. It shows we shouldn’t be excluding women from research based on the idea that their menstrual cycles are going to skew the results.”

In fact, the study demonstrated why it’s crucial to include women in research. While women’s menstrual cycles didn’t affect their exercise, there were key differences between how women’s and men’s endurance played out. For example, women reached exhaustion from muscle fatigue about 18% faster than men, even when adjusting for muscle mass, possibly because women’s bodies may naturally reserve more energy.

“The assumption in exercise research has long been that women are like men, just smaller,” said BYU exercise science professor and co-author Jayson Gifford. “Our study suggests that they’re not, that there are important differences between women’s and men’s exercise. Including more women in research will allow us to fine tune approaches to women’s physiology.”

For the study, seven women and 10 men completed intense cycling sessions, the women at three points during the menstrual cycle confirmed through blood draws and ovulation tests, and the men at 10-day intervals. As participants exercised, researchers measured heart and respiratory rates to assess performance.

“Previous studies have looked at maybe one intensity of exercise in the menstrual cycle, but Jessica was extremely comprehensive and looked at five. It was one of the most thorough studies I’ve seen to date, and the data were extremely convincing,” Gifford said.

Although female participants often told the researchers that their menstrual cycles affected how they were feeling and how well they expected to perform, their measurable results showed “absolutely no change,” the researchers said. While hormones like estrogen are known to influence how well arteries dilate and how blood flows to muscles, those underlying processes “didn’t amount to impaired overall performance.”

Linde and Gifford were careful to note that the study focused only on cycling and included only women without menstrual disorders. More research is needed to determine how irregular menstruation might affect exercise. Learning more about women’s exercise is especially important now that there are more female athletes than ever — Linde, who is now continuing her research as a Ph.D. student at Marquette University, was herself inspired to pursue the research because of her experiences as a Division I athlete in college.

“I had never considered my female physiology impacting my performance until I got injured, and it was brought up,” Linde said. “I think sometimes we just don’t think of these questions. But in the last Olympics, the number of female and male athletes was finally equal. We have so many female athletes and women in general who are exercising and want answers about how they perform, so we need to study them.”

New study shows snacking on mixed tree nuts may impact cardiovascular risk factors and increase serotonin

New findings From UCLA published in Nutrients in Partnership with The International Tree Nut Council Nutrition Research & Education Foundation

Peer-Reviewed Publication

THE MOTION AGENCY

Logo 

IMAGE: INC NREF LOGO view more 

CREDIT: INC NREF

In a paper[1] published online this week in the journal, Nutrients, researchers found that consuming mixed tree nuts (almonds, Brazil nuts, cashews, hazelnuts, macadamias, pecans, pine nuts, pistachios and walnuts) had a positive effect on the metabolism of the essential amino acid, tryptophan, in overweight and obese individuals. Specifically, there was an increase in both cardioprotective tryptophan metabolites and in the neurotransmitter, serotonin.

 

In a previous study[2], researchers at UCLA demonstrated that consuming 1.5 ounces of tree nuts per day (versus pretzels) during 24 weeks of weight loss and weight maintenance, resulted in weight loss, increased satiety, decreased diastolic blood pressure and decreased heart rate. Tryptophan (found in tree nuts) has been indicated as an important factor in cardiovascular disease (CVD). It is metabolized in the gut, producing many bioactive metabolites that are important in immune regulation affecting chronic diseases such as diabetes and CVD. The current study looked at whether tree nut snacks, as part of a hypocaloric diet, could modify the gut microbiome, resulting in increased levels of cardio-protective tryptophan microbial metabolites.

Plasma and stool samples were collected from 95 overweight or obese participants and were evaluated in the current study for tryptophan metabolites and for gut microbiota. “We’ve known for a long time that tree nuts can help decrease CVD risk, and these findings provide some possible explanations,”

Stated lead researcher, Zhaoping Li, MD, PhD, Professor of Medicine and Chief of the Division of Clinical Nutrition at UCLA. “We discovered some new associations between tryptophan metabolites and blood pressure, heart rate, and satiety in overweight/obese subjects, suggesting a broader impact of tryptophan metabolism in overall health, including cardiovascular health.”

Another interesting finding was the significant increase in blood serotonin levels (60.9% and 82.2% increase from baseline at week 12 and 24, respectively) in both the weight loss and weight maintenance phases, in the those who consumed mixed tree nuts. “This is the first time we’ve seen mixed tree nut consumption associated with an increase in serotonin levels in the body,” explained Dr. Li. “While more research is needed, this is exciting since serotonin can have an important impact on mood and overall mental health.”

Research has shown that people get about 25% of their calories each day from snacks and a large proportion come from desserts, sugar-sweetened beverages, sweets and salty snacks.[3] “Replacing just one of those snacks with 1.5 ounces of tree nuts may help improve overall health and reduce the risk for various chronic diseases,” stated Maureen Ternus, M.S., R.D.N, Executive Director of the International Tree Nut Council Nutrition Research & Education Foundation.

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The International Tree Nut Council Nutrition Research & Education Foundation (INC NREF) is a

non-profit, non-governmental organization dedicated to supporting nutrition research and education for consumers and health professionals throughout the world. Members include those associations and organizations that represent the nine tree nuts (almonds, Brazils, cashews, hazelnuts, macadamias, pecans, pine nuts, pistachios and walnuts). For more information, please visit our website at www.nuthealth.org.

[1] Yang, J., R. Lee, Z. Schulz, A. Hsu, J. Pai, S. Yang, S.M. Henning, J. Huang, J.P. Jacobs, D. Heber, Z. Li, 2023. Mixed Nuts as Healthy Snacks: Effect on Tryptophan Metabolism and Cardiovascular Risk Factors. Nutrients. 15, 569; https://doi.org/10.3390/nu15030569

[2] Wang, J., S. Wang, S.M., Henning, T. Qin, Y. Pan, J. Yang, J. Huang, C.-H. Tseng, D. Heber, Z. Li., 2021 Mixed tree nut snacks compared to refined carbohydrate snacks resulted in weight loss and increased satiety during both weight loss and weight maintenance: a 24-week randomized controlled trial. Nutrients. 13(5), 1512; https://doi.org/10.3390/nu13051512

[3] Dunford, E.K., B.M. Popkin, 2017. Disparities in snacking trends in US adults over a 35-year period from 1977 to 2012. Nutrients. 9(8), 809; https://doi.org/10.3390/nu9080809.

Satellite data shows sustained severe drought in Europe

Europe lacks groundwater – a lot of groundwater. The continent has already been suffering from a severe drought since 2018. This is confirmed by satellite data analysed at the Institute of Geodesy at TU Graz

Reports and Proceedings

GRAZ UNIVERSITY OF TECHNOLOGY

Drought in Europe in 2019 

IMAGE: ALREADY IN 2019 THE AMOUNT OF GROUND WATER IN CENTRAL EUROPE WAS VERY LOW. view more 

CREDIT: KVAS - TU GRAZ

Europe has been experiencing a severe drought for years. Across the continent, groundwater levels have been consistently low since 2018, even if extreme weather events with flooding temporarily give a different picture.

The beginning of this tense situation is documented in a publication by Eva Boergens in Geophysical Research Letters from the year 2020. In it, she noted that there was a striking water shortage in Central Europe during the summer months of 2018 and 2019. Since then, there has been no significant rise in groundwater levels; the levels have remained constantly low. This is shown by data analyses by Torsten Mayer-Gürr and Andreas Kvas from the Institute of Geodesy at Graz University of Technology (TU Graz). As part of the EU's Global Gravity-based Groundwater Product (G3P) project, they used satellite gravimetry to observe the world's groundwater resources and documented their changes in recent years.

Far-reaching consequences

The effects of this prolonged drought were evident in Europe in the summer of 2022. Dry riverbeds, stagnant waters that slowly disappeared and with them numerous impacts on nature and people. Not only did numerous aquatic species lose their habitat and dry soils cause many problems for agriculture, but the energy shortage in Europe also worsened as a result. Nuclear power plants in France lacked the cooling water to generate enough electricity and hydroelectric power plants could not fulfil their function without sufficient water either.

Groundwater measurement from space

How can the geodesists at TU Graz use data from space to make accurate statements about groundwater reservoirs? At the heart of the G3P project are twin satellites named Tom and Jerry, which orbit the Earth in a polar orbit at an altitude of just under 490 kilometres. The distance between the satellites of around 200 kilometres is important. The one behind must not catch up with the one in front, which is why they have been given the name Tom and Jerry in reference to the cartoon characters.

The distance between the satellites is being constantly and precisely measured. If they fly over a mountain, the satellite in front is initially faster than the one behind because of the increased mass under it. Once it has passed the mountain, it slows down slightly again, but the rear satellite accelerates as soon as it reaches the mountain. Once both are over the mountain, their relative speed is established once more. These changes in distance over large masses are the main measurement variables for determining the Earth's gravitational field and are ascertained with micrometre precision. As a comparison, a hair is about 50 micrometres thick.

Monthly gravity map of the Earth

All of this happens at a flight speed of around 30,000 km/h. The two satellites thus manage 15 Earth orbits a day, which means that they achieve complete coverage of the Earth's surface after one month. This in turn means that TU Graz can provide a gravity map of the Earth every month. “The processing and the computational effort here are quite large. We have a distance measurement every five seconds and thus about half a million measurements per month. From this we then determine gravity field maps,” says Torsten Mayer-Gürr.

Mass minus mass equals mass

However, the gravity map does not yet determine the amount of groundwater. This is because the satellites show all mass changes and make no distinction between sea, lakes or groundwater. This requires cooperation with all other partners in the EU G3P project. Torsten Mayer-Gürr and his team provide the total mass, from which the mass changes in the rivers and lakes are then subtracted, the soil moisture, snow and ice are also subtracted and finally only the groundwater remains.

Each of these other masses has its own experts who contribute their data here. These are located in Austria (Graz University of Technology, Vienna University of Technology, Earth Observation Data Center EODC), Germany (GeoForschungsZentrum GFZ in Potsdam), Switzerland (University of Bern, University of Zurich), France (Collection Localisation Satellites CLS, Laboratoire d'Etudes en Géophysique et Océanographie Spatiales LEGOS, Magellium), Spain (FutureWater), Finland (Finnish Meteorological Institute) and the Netherlands (International Groundwater Resources Assessment Centre IGRAC).

Europe has a water problem

The result of this cooperation shows that the water situation in Europe has now become very precarious. Torsten Mayer-Gürr had not expected this on such a big scale. “A few years ago, I would never have imagined that water would be a problem here in Europe, especially in Germany or Austria. We are actually getting problems with the water supply here – we have to think about this,” he explains. From his point of view, it is first of all necessary to be able to document the continuing drought using data and to have continuous satellite missions on this in space.

The European Space Agency ESA and its US counterpart NASA will continue this research with the MAGIC (Mass-change And Geoscience International Constellation) project. TU Graz will again be on board for the data evaluation.

For more information on satellite geodesy, see the article “Cat chases mouse in space

Information on the G3P project

OHSU researchers find immune response to COVID-19 strengthens over time

Study suggests people who have had COVID-19 benefit from vaccination, even if they’ve delayed it

Peer-Reviewed Publication

OREGON HEALTH & SCIENCE UNIVERSITY

Immunity from COVID-19 appears to gather strength with more time between vaccination and infection, a new laboratory study from researchers at Oregon Health & Science University suggests. The findings carry implications for vaccine recommendations as the pandemic transitions to an endemic state.

Researchers measured the antibody response in blood samples for a group of people who gained so-called “hybrid immunity” through two means: either vaccination followed by a breakthrough infection, or by getting vaccinated after contracting COVID-19. They measured the immune response in blood samples of 96 generally healthy OHSU employees and found that the immune response was uniformly stronger the longer the time period between vaccination and infection. The longest interval measured was 404 days.

Their findings suggest that vaccine boosters should be spaced no more frequently than a year apart, at least among healthy people.

“Longer intervals between natural infection and vaccination appear to strengthen immune response for otherwise healthy people,” said co-senior author Fikadu Tafesse, Ph.D., associate professor of molecular microbiology and immunology in the OHSU School of Medicine.

The study comes as an advisory panel for the Food and Drug Administration is due to meet Thursday, Jan. 26, to consider the nation’s COVID-19 vaccine strategy going forward.

Published in the Journal for Clinical Investigation Insight, the new research is the latest in a series of laboratory discoveries by OHSU scientists revealing a pattern of strengthened immune response through hybrid immunity. Their findings suggest that the magnitude, potency and breadth of hybrid immune response all increased with a longer time period between exposure to the virus — whether through vaccination or natural infection.

This likely is related to the body’s immune response maturing over time, said co-senior author Marcel Curlin, M.D., associate professor of medicine (infectious diseases) in the OHSU School of Medicine and medical director of OHSU Occupational Health.

“The immune system is learning,” Curlin said. “If you’re going to amplify a response, what this study tells us is that you might want to boost that response after a longer period of learning rather than early after exposure.”

Further, the research team found that it didn’t matter whether someone developed hybrid immunity by getting vaccinated after contracting COVID-19 or after a breakthrough infection following vaccination. Both groups developed an equally potent immune response.

The findings suggest long-lasting potency of so-called “memory cells,” the B cells that recognize an invading virus and generate protein antibodies to neutralize the virus and its many variants. The authors write that an ever-growing pool of people who have contracted the SARS-CoV-2 virus stand to benefit from vaccination, even if they’ve delayed it until now.

Relying on natural infection alone is a bad idea, “given the risks of severe illness, long-term complications, and death,” the authors write.

The researchers say the findings are the latest to point toward the virus evolving to an endemic state.

“Our results point to a future where inevitable vaccine breakthrough infections would be expected to help build a reservoir of population-level immunity that can help blunt future waves and reduce the opportunity for further viral evolution,” they write.

The researchers cautioned that the immune response was measured in relatively healthy people, and boosters may be advisable on a more frequent basis among vulnerable people who are older or are immunocompromised.

Funding for this study was supported by the M.J. Murdock Charitable Trust; the OHSU Foundation; the National Institutes of Health training grant T32HL083808; NIH grant R01AI145835; and a grant from the OHSU Innovates IDEA fund. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH.

COVID toll realized: CVD deaths take big jump, especially among certain populations

American Heart Association 2023 Statistical Update reports largest increase in the number of CVD deaths in the U.S. in years, highest among Asian, Black and Hispanic populations

Peer-Reviewed Publication

AMERICAN HEART ASSOCIATION

Report Highlights:

  • More people died from cardiovascular-related causes in 2020, the first year of the COVID-19 pandemic, than in any year since 2003, according to data reported in the American Heart Association’s 2023 Statistical Update.
  • The largest increases in deaths were seen among Asian, Black and Hispanic people
  • While the pandemic’s effects on death rates may be noticed for several years, lessons learned offer major opportunities to address structural and societal issues that drive health disparities, according to Association leaders.

DALLAS, Jan. 25, 2023 — The number of people dying from cardiovascular disease (CVD) in the U.S. escalated during the first year of the COVID-19 pandemic, from 874,613 CVD-related deaths recorded in 2019 to 928,741 in 2020. The rise in the number of CVD deaths in 2020 represents the largest single-year increase since 2015 and topped the previous high of 910,000 recorded in 2003, according to the latest available data from the Heart Disease and Stroke Statistics — 2023 Update of the American Heart Association, a global force for healthier lives for all, and published today in the Association’s flagship, peer-reviewed journal Circulation.

“While the total number of CVD-related deaths increased from 2019 to 2020, what may be even more telling is that our age-adjusted mortality rate increased for the first time in many years and by a fairly substantial 4.6%,” said the volunteer chair of the Statistical Update writing group Connie W. Tsao, M.D., M.P.H., FAHA, an assistant professor of medicine at Harvard Medical School and attending staff cardiologist at Beth Israel Deaconess Medical Center in Boston. “The age-adjusted mortality rate takes into consideration that the total population may have more older adults from one year to another, in which case you might expect higher rates of death among older people. So even though our total number of deaths have been slowly increasing over the past decade, we have seen a decline each year in our age-adjusted rates – until 2020. I think that is very indicative of what has been going on within our country – and the world – in light of people of all ages being impacted by the COVID-19 pandemic, especially before vaccines were available to slow the spread.”

The biggest increases in the overall number of CVD-related deaths were seen among Asian, Black and Hispanic people, populations most impacted in the early days of the pandemic, and brought to focus increasing structural and societal disparities.

“We know that COVID-19 took a tremendous toll, and preliminary data from the U.S. Centers for Disease Control and Prevention (CDC) have shown that there was a substantial increase in the loss of lives from all causes since the start of the pandemic. That this likely translated to an increase in overall cardiovascular deaths, while disheartening, is not surprising. In fact, the Association predicted this trend, which is now official,” said the American Heart Association’s volunteer president, Michelle A. Albert, M.D., M.P.H., FAHA, the Walter A. Haas-Lucie Stern Endowed Chair in Cardiology, a professor of medicine at the University of California at San Francisco (UCSF) and Admissions Dean for UCSF Medical School. “COVID-19 has both direct and indirect impacts on cardiovascular health. As we learned, the virus is associated with new clotting and inflammation. We also know that many people who had new or existing heart disease and stroke symptoms were reluctant to seek medical care, particularly in the early days of the pandemic. This resulted in people presenting with more advanced stages of cardiovascular conditions and needing more acute or urgent treatment for what may have been manageable chronic conditions. And, sadly, appears to have cost many their lives.”

According to Albert, who also is the director of the CeNter for the StUdy of AdveRsiTy and CardiovascUlaR DiseasE (NURTURE Center) at UCSF and a renowned leader in health equity and adversity research, the larger increases in the number of coronary heart disease deaths among adults of Asian, Black and Hispanic populations appear to correlate with the people most often infected with COVID-19.

“People from communities of color were among those more highly impacted, especially early on, often due to a disproportionate burden of cardiovascular risk factors such as hypertension and obesity. Additionally, there are socioeconomic considerations, as well as the ongoing impact of structural racism on multiple factors including limiting the ability to access quality health care,” Albert said. “The American Heart Association responded quickly at the beginning of the pandemic to address the impact of COVID-19 and  focus on equitable health for all. The Association launched the first-ever rapid response research grants calling on the research community to quickly turn around transformative science; established a COVID-19 CVD hospital registry through the Get With The Guidelines® quality initiative; and also made an unprecedented pledge to aggressively address social determinants while working to support and improve the equitable health of all communities. We are empowering real change that will save lives.”

Cardiovascular disease, overall, includes coronary heart disease, strokeheart failure and hypertension/high blood pressure. Coronary heart disease includes clogged arteries or atherosclerosis of the heart, which can cause a heart attack. Known generally as ‘heart disease’, coronary heart disease remains the #1 cause of death in the U.S. Stroke continues to rank fifth among all causes of death behind heart disease, cancer, COVID-19 and unintentional injuries/accidents. COVID-19 appeared in the list of leading causes of death for the first time in 2020, the most recent year for which final statistics are available from the U.S. Centers for Disease Control and Prevention (CDC).

Appropriately, this year’s statistical update includes many references to COVID-19 and its impact on cardiovascular disease. Data points and scientific research findings are inserted throughout most chapters of the document, including those related to the risk factors for heart disease and stroke such as obesity, diabetes and high blood pressure, all of which also put people at increased risk for COVID. Many of the studies noted identify specific gender, race and ethnicity disparities.

However, disparities don’t only occur among age, sex and racial/ethnic groups, according to a special commentary authored by members of the Statistical Update writing committee. While the Statistical Update has been including various social determinants of health data in its report, the commentary noted that data from other underrepresented populations, such as LGBTQ people and people living in rural vs. urban areas of the U.S. are still lacking. The commentary authors call out the lack of scientific research and cumulative data on the impacts of social identity and social determinants.

“We know that to address discrimination and disparities that impact health, we must better recognize and understand the unique experiences of individuals and populations. This year’s writing group made a concerted effort to gather information on specific social factors related to health risk and outcomes, including sexual orientation, gender identity, urbanization and socioeconomic position,” Tsao said. “However, the data are lacking because these communities are grossly underrepresented in clinical and epidemiological research. We are hopeful that this gap in literature will be filled in coming years as it will be critical to the American Heart Association’s goal to achieve cardiovascular health equity for all in the U.S. and globally.”

Global data

Cardiovascular disease continues to be the #1 killer globally, taking the lives of more than 19 million people around the world each year, including people of all ages, genders and nationalities. Yet, the risk factors that lead to heart disease and stroke continue to disproportionately impact certain populations in the U.S. as well as around the world.

Supplemental tables in this year’s statistical update look at the trend of overall CVD-related deaths globally and regionally, and also provide the number and proportion of deaths caused by various cardiovascular diagnoses. Additionally, the supplemental tables compared all-cause deaths and CVD-related deaths attributable to various risk factors, as well as age-standardized disability-adjusted life years, or DALYs, in various countries and regions. Of special note:

  • Globally, ischemic heart disease and stroke represent the top two causes of CVD-related deaths and account for 16.2% and 11.6% of all causes of deaths, respectively. These rates have increased across the world over the past decade in all but two regions – North America and Europe/Central Asia. Note that ischemic heart disease is the term used in global data sources and is also known as coronary heart disease.
  • In 1990, ischemic heart disease represented 28.2% of all deaths in North America, dropping to 18.7% of all deaths in 2019. Stroke dropped from 7.3% of all deaths in North America in 1990 to 6.4% of all deaths in 2019.
  • In the region of Europe and Central Asia, ischemic heart disease dropped from 27.2% of all causes of death in 1990 to 24.4% in 2019, while stroke represented 15.1% of all causes of death in 1990 and dropped to 12.5% in 2019.
  • The region of East Asia and Pacific is the only region where stroke represents the highest proportion of CVD-related deaths, with the proportion of deaths increasing from 14.8% in 1990 to 18.3% in 2019. During this same time period, the proportion of deaths caused by ischemic heart disease nearly doubled from 8.1% to 15.6%.
  • The region of Sub-Saharan Africa noted the lowest proportion of CVD-related deaths as a percentage of all causes of death. Stroke was the leading cause of CVD-related deaths in the region of Sub-Saharan Africa in 1990, representing 3.6% of all causes, followed by ischemic heart disease (3.1%). In 2019, ischemic heart disease and stroke were both at 5.4% of total deaths.

“As the U.S. prepares to celebrate the 60th annual Heart Month in February 2023, it’s critical that we recognize and redouble the life-saving progress we’ve made in nearly a century of researching, advocating and educating, while identifying and removing those barriers that still put certain people at disproportionately increased risk for cardiovascular disease,” Albert said. “Tracking such trends is one of the reasons the American Heart Association publishes this definitive statistical update annually, providing a comprehensive resource of the most current data, relevant scientific findings and assessment of the impact of cardiovascular disease nationally and globally.”

The annual update represents a compilation of the newest, most relevant statistics on heart disease, stroke and risk factors impacting cardiovascular health. It tracks trends related to ideal cardiovascular health, social determinants of health, global cardiovascular health, cardiovascular health genetics and health care costs. Tsao emphasized the importance of this surveillance as a critical resource for the lay public, policy makers, media professionals, clinicians, health care administrators, researchers, health advocates and others seeking the best available data on these factors and conditions.

This statistical update was prepared by a volunteer writing group on behalf of the American Heart Association Council on Epidemiology and Prevention Statistics Committee and Stroke Statistics Subcommittee.

Additional author names and authors’ disclosures are listed in the manuscript.

The Association receives funding primarily from individuals. Foundations and corporations (including pharmaceutical, device manufacturers and other companies) also make donations and fund specific Association programs and events. The Association has strict policies to prevent these relationships from influencing the science content. Revenues from pharmaceutical and biotech companies, device manufacturers and health insurance providers, and the Association’s overall financial information are available here.

Additional Resources:

About the American Heart Association

The American Heart Association is a relentless force for a world of longer, healthier lives. We are dedicated to ensuring equitable health in all communities. Through collaboration with numerous organizations, and powered by millions of volunteers, we fund innovative research, advocate for the public’s health and share lifesaving resources. The Dallas-based organization has been a leading source of health information for nearly a century. Connect with us on heart.orgFacebookTwitter or by calling 1-800-AHA-USA1.

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