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9/11 World Trade Center Exposure Linked to Heart Disease Among NYC Firefighters

BRONX, N.Y., Sept. 6, 2019 /PRNewswire/ -- A new study of New York City firefighters has found that exposure to 9/11 World Trade Center (WTC) dust is associated with a significantly increased long-term risk of cardiovascular disease (CVD). The study, conducted by researchers at Albert  Einstein College of MedicineMontefiore Health System, and the Fire Department of the City of New York  (FDNY), found that those who arrived first at the WTC site—when the air-borne dust was thickest—have a 44% increased risk of CVD compared to those who arrived later in the day. The study was published online today in JAMA Open Network.

Albert Einstein College of Medicine Logo. (PRNewsFoto/Albert Einstein College of Medicine)

"The increase in risk was significant, even taking into account known CVD risk factors such as age, hypertension, elevated cholesterol, diabetes, and smoking," said study leader David J. Prezant, M.D ., a professor of medicine at Einstein, a pulmonary disease specialist at Montefiore, and chief medical officer of the FDNY.

This study's finding of an increased risk of CVD with WTC exposure—as well as the researchers' earlier studies identifying an increased risk for autoimmune rheumatologic diseases and for a blood cancer precursor that can lead to the cancer multiple myeloma—"highlights the need to add these health conditions to the list of WTC-related diseases that are coverable under the James L. Zadroga 9/11 Health and Compensation Act," Dr. Prezant added.

Studies have repeatedly shown that WTC exposure is associated with immediate and long-term risk of adverse health effects, including respiratory problems, post-traumatic stress disorder (PTSD), and several types of cancer. A few studies have examined the association between WTC exposure and CVD. However, the results were inconsistent for a variety of reasons, primarily because they relied on first responders' self-reported health measures.

Assessing Cardiovascular Disease Risk

The current study involved 9,796 firefighters who worked at the WTC site. Most were never smokers (74%) and non-Hispanic white (94%), with an average age of 40 on September 11, 2001. All were men, since there were too few female firefighters at the WTC site to obtain meaningful data.

For this study, the firefighters were divided into four groups: (1) those who first arrived at the WTC site during the morning of 9/11 (who were believed to receive the highest dust exposure); (2) those who first arrived that afternoon; (3) those who first arrived on September 12; and (4) those who first arrived between days 3 and 14.

The researchers reviewed 16 years of medical records, physician examinations, and questionnaires to assess the participants for primary and secondary CVD events. (Primary CVD events were defined as myocardial infarction, stroke, unstable angina, coronary artery surgery or angioplasty, or CVD death; secondary events included transient ischemic attack, angina defined as either angina medication or cardiac catheterization without intervention, cardiomyopathy, and "other CVD": aortic aneurysm, peripheral arterial vascular intervention, and carotid artery surgery.)

Firefighters who arrived during and immediately after the WTC collapse (group 1) had a 44% higher risk of experiencing primary and secondary CVD events compared with those who arrived on September 12 or later (groups 3 and 4 combined). Similarly, those who worked at the WTC site for six months or more were 30% more likely to have experienced a primary or secondary CVD event compared with those who worked less time at the site. These associations were statistically significant after taking into account age, race/ethnicity, and baseline assessments of body mass index, hypertension, elevated cholesterol, diabetes, smoking, and probable PTSD.

"An important message is that new chest pain in this group should not automatically be attributed to well-known WTC-related illnesses, such as acid reflux or obstructive airway disease. It might very well be associated with CVD," said Dr. Prezant.

Monitoring Symptoms and Health

"Our results emphasize why it is crucial to monitor the long-term health of anyone exposed to massive environmental disasters, even many years after the event," said co-lead author Rachel Zeig-Owens, Dr.P.H., a research assistant professor of epidemiology & population health at Einstein and an epidemiologist at Montefiore and FDNY. "By screening for and treating the other CVD risk factors—such as elevated cholesterol, hypertension, obesity, and smoking—we are able to lower the overall risk of CVD in those most exposed to the World Trade Center disaster."

Many other studies have linked both acute and prolonged exposure to air pollution to CVD. The researchers noted that exposure to dust and products of combustion could have triggered persistent disease processes involving chronic inflammation that increased the risk for CVD years later.

The study is titled, "Long-term Cardiovascular Disease Risk among Firefighters after the World Trade Center Disaster." The other contributors include: Hillel W. Cohen, Dr.P.H., (Einstein), Cynthia Joe (Montefiore, and FDNY), Charles B. Hall, Ph.D., (Einstein), Mayris P. Webber, Dr.P.H., (Einstein, Montefiore, and FDNY), Michael D. Weiden, M.D., (FDNY and New York University School of Medicine, New York, NY), Krystal L. Cleven, M.D., (Einstein and Montefiore), Nadia Jaber (FDNY), Molly Skerker (Montefiore, and FDNY), Jennifer Yip, M.P.H., (Montefiore, and FDNY), and Theresa Schwartz, M.S., (Montefiore, and FDNY).

This research was supported through the National Institute for Occupational Safety and Health (contract numbers 200-2011-39378, 200-2011-39383, 200-2017-93326, 200-2017-93426).

About Albert Einstein College of Medicine

Albert Einstein College of Medicine is one of the nation's premier centers for research, medical education and clinical investigation. During the 2018-2019 academic year, Einstein is home to 711 M.D. students, 160 Ph.D. students, 107 students in the combined M.D./Ph.D. program, and 265 postdoctoral research fellows. The College of Medicine has more than 1,800 full-time faculty members located on the main campus and at its clinical affiliates. In 2018, Einstein received more than $172 million in awards from the National Institutes of Health (NIH). This includes the funding of major research centers at Einstein in aging, intellectual development disorders, diabetes, cancer, clinical and translational research, liver disease, and AIDS. Other areas where the College of Medicine is concentrating its efforts include developmental brain research, neuroscience, cardiac disease, and initiatives to reduce and eliminate ethnic and racial health disparities. Its partnership with Montefiore, the University Hospital and academic medical center for Einstein, advances clinical and translational research to accelerate the pace at which new discoveries become the treatments and therapies that benefit patients. Einstein runs one of the largest residency and fellowship training programs in the medical and dental professions in the United States through Montefiore and an affiliation network involving hospitals and medical centers in the Bronx, Brooklyn and on Long Island. For more information, please visit www.einstein.yu.edu, read our blog, follow us on Twitter, like us on Facebook , and view us on YouTube.

 

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SOURCE Albert Einstein College of Medicine

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