Pandemic Measures Reduced Exposure to Seasonal Viruses, a Common COPD Trigger
Researchers at the University of Maryland School of Medicine (UMSOM) analyzed data at the 13-hospital University of Maryland Medical System (UMMS) and found public health measures designed to reduce the spread of the COVID-19 virus may have fostered a substantial side benefit: Hospital admissions for chronic obstructive pulmonary disease (COPD) were reduced by 53 percent, according to a new study published in The American Journal of Medicine. This is likely due to a drop in circulating seasonal respiratory viruses such as influenza.
Hospitalizations for COPD, a group of lung diseases that make it hard to breathe and get worse over time, are commonly driven by flare-ups where symptoms are triggered by such factors as tobacco smoke, air pollution and respiratory infections. Seasonal respiratory viruses, including those that cause the common cold or influenza, trigger nearly half of those flare-ups.
In the wake of a marked drop in COPD admissions during the pandemic, the researchers theorized that COVID-19 behavior changes – a mix of stay-at-home orders, social distancing, masking mandates and strict limitations on large gatherings – not only protected against COVID-19, but they may have also reduced exposure to other respiratory infections.
Conversely, they worry that the return to normal behavior may lead to more COPD flare-ups.
“Our study shows there’s a silver lining to the behavior changes beyond protecting against COVID-19,” said senior author Robert M. Reed, MD, UMSOM Professor of Medicine and pulmonologist at the University of Maryland Medical Center (UMMC). “If we completely eliminate masks and distancing during cold and flu season, we’ll allow all those viruses that have been effectively suppressed to come raging back. There could be a lot of illness.”
Prior to the COVID-19 pandemic, COPD was the fourth-leading cause of death worldwide and a leading cause of hospital admissions in the United States. The pandemic has led to significant changes in health care delivery, including reduced admissions for COPD and other non-COVID illnesses, some of which may have stemmed from patients’ fear of contracting COVID in various hospital settings, as well as a shift toward telemedicine and outpatient COPD management during the pandemic.
To understand what may have occurred to reduce COPD admissions, the researchers compared weekly hospital admissions for COPD in the pre-COVID-19 years of 2018 and 2019, with admissions after the COVID-19 public health measures were instituted.
At UMMS, those measures were implemented before April 1, 2020, so the investigators chose the same five-month period in each year for their comparison, April 1 to Sept. 30.
Co-lead author Jennifer Y. So, MD, UMSOM Assistant Professor of Medicine and COPD specialist at UMMC, said electronic medical records from multiple hospitals across a range of communities in the UMMS database facilitated a granular evaluation of changes over time. “We assessed a variety of possible causes that could affect COPD admissions including the presence of multiple diseases or medical conditions and the frequency of COPD exacerbations.”
The database findings were correlated with data on respiratory viral trends from the U.S. Centers for Disease Control and Prevention for the period of Jan. 1, 2018, through Oct. 1, 2020.
“We found a 53 percent drop in COPD admissions throughout UMMS during COVID-19. That is substantial, but equally significant, the drop in weekly COPD admissions was 36 percent lower than the declines seen in other serious medical conditions, including congestive heart failure, diabetes and heart attack,” said Dr. So.
As more and more people are vaccinated against COVID-19 and many of the public health measures of the past year are relaxed, the researchers warn that a full return to normal may again expose COPD patients to the familiar seasonal triggers.
“Our study did not assess which public health components worked to tame seasonal respiratory viruses, but a simple thing like wearing a mask while riding on public transit or working from home when you’re sick with a cold could go a long way to reduce virus exposure,” said Dr. Reed.
Dr. So, who is from South Korea, said it is a cultural norm to wear masks during the winter in her native country. “The COVID-19 pandemic has helped a lot of people around the world become more aware of the role of masking and social distancing to reduce the spread of disease,” she said.
“This is a compelling study that raises some important public health questions about protecting our most vulnerable patient populations after we are finished with the COVID-19 pandemic. I certainly think it warrants a fuller discussion,” said UMSOM Dean E. Albert Reece, MD, PhD, MBA, University Executive Vice President for Medical Affairs and the John Z. and Akiko K. Bowers Distinguished Professor.
So JY, O’Hara NN, Kenaa B, Williams JG, deBorja CL, Slejko JF, Zafari Z, Sokolow M, Zimand P, Deming M, Marx J, Pollak A, Reed RM. Decline in COPD Admissions During the COVID-19 Pandemic Associated with Lower Burden of Community Respiratory Viral Infections. The American Medical Journal of Medicine. doi: https://doi.org/10.1016/j.amjmed.2021.05.008
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Now in its third century, the University of Maryland School of Medicine was chartered in 1807 as the first public medical school in the United States. It continues today as one of the fastest growing, top-tier biomedical research enterprises in the world -- with 46 academic departments, centers, institutes, and programs, and a faculty of more than 3,000 physicians, scientists, and allied health professionals, including members of the National Academy of Medicine and the National Academy of Sciences, and a distinguished two-time winner of the Albert E. Lasker Award in Medical Research. With an operating budget of more than $1.2 billion, the School of Medicine works closely in partnership with the University of Maryland Medical Center and Medical System to provide research-intensive, academic and clinically based care for nearly 2 million patients each year. The School of Medicine has nearly $600 million in extramural funding, with most of its academic departments highly ranked among all medical schools in the nation in research funding. As one of the seven professional schools that make up the University of Maryland, Baltimore campus, the School of Medicine has a total population of nearly 9,000 faculty and staff, including 2,500 students, trainees, residents, and fellows. The combined School of Medicine and Medical System (“University of Maryland Medicine”) has an annual budget of over $6 billion and an economic impact of nearly $20 billion on the state and local community. The School of Medicine, which ranks as the 8th highest among public medical schools in research productivity (according to the Association of American Medical Colleges profile) is an innovator in translational medicine, with 606 active patents and 52 start-up companies. In the latest U.S. News & World Report ranking of the Best Medical Schools, published in 2021, the UM School of Medicine is ranked #9 among the 92 public medical schools in the U.S., and in the top 15 percent (#27) of all 192 public and private U.S. medical schools. The School of Medicine works locally, nationally, and globally, with research and treatment facilities in 36 countries around the world. Visit medschool.umaryland.edu
About the University of Maryland Medical System
The University of Maryland Medical System (UMMS) is a university-based regional health care system focused on serving the health care needs of Maryland, bringing innovation, discovery and research to the care we provide and educating the state's future physician and health care professionals through our partnership with the University of Maryland School of Medicine and University of Maryland, Baltimore professional schools (Nursing, Pharmacy, Social Work and Dentistry) in Baltimore. As one of the largest private employers in the State, the health system's more than 29,500 employees and 4,000 affiliated physicians provide primary and specialty care in more than 150 locations, including 13 hospitals and 9 University of Maryland Urgent Care centers. The UMMS flagship academic campus, the University of Maryland Medical Center in downtown Baltimore, is recognized regionally and nationally for excellence and innovation in specialized care. Our acute care and specialty rehabilitation hospitals serve urban, suburban and rural communities and are located in 13 counties across the State. For more information, visit www.umms.org.