Aspergillus conidia are ubiquitous in the environment, and the respiratory epithelium and associated cilia act as the first defense against IPA. Distinct from influenza pneumonia, severe COVID-19 causes diffuse alveolar damage and does not appear to cause significant damage to the respiratory epithelium (Borczuk AC, et al. Mod Pathol. 2020;33[11]:2156-68). This coupled with the lack of histopathologic evidence of invasion in most reports of CAPA raises question regarding the extent of the association between COVID-19 and IPA. Nonetheless, immune perturbation caused by COVID-19 immunomodulating therapies, such as corticosteroids and IL-6 inhibitors, may ultimately leave patients susceptible to IPA and other opportunistic infections.
Kelly M. Pennington, MD
Charles S. Dela Cruz, MD
Sebastion Kurz, MD
NetWork Steering Committee Members
Clinical pulmonary medicine
New USPSTF guidelines for lung cancer screening: A step forward
Despite lung cancer being the number one cause of cancer-related death in America, screening for lung cancer remains low, with only 2-16% eligible patients being offered screening since the US Preventive Services Task Force (USPSTF) recommendation in 2013. New guidelines published in JAMA (Krist AH, et al. JAMA. 2021;325[10]:962-970; Meza R, et al. JAMA. 2021;325[10]:988-97; Jonas DE, at al. JAMA. 2021;325[10]:971-87) have suggested broadening eligibility to those 50-80 years old, who are smokers or previously quit in the past 15 years and have a minimum 20 pack-year smoking history (Grade B recommendation). The change lowers the starting age to 50 and the smoking requirement from 30 to 20 pack-years. Based on Cancer Intervention and Surveillance Modeling Network (CISNET) modeling, utilized by the UPSTF, this change can result in 503 (vs. 381 in the prior guideline) cancer deaths averted for every 100,000 adults and an estimated 13% reduction in lung cancer mortality and 6,918 life-years gained.
This recommendation will dramatically increase the number of eligible adults for screening by 6.4 million people, an increase of 86% compared with the 2013 guidelines. Most importantly, the decrease in pack-year requirement to 20 is expected to increase eligibility for women and minimize racial disparities. African American men have a higher incidence of lung cancer with less smoke exposure compared with white men. Non-Hispanic Black, Hispanics, American Indian/Alaska Native persons are hoped to have significant benefit from these new recommendations. Original recommendations in the 2013 guideline mirrored the National Lung Screening Trial, in which 91% participants were White. Regardless of these updated recommendations, serious socioeconomic barriers may continue to limit racial/ethnic minorities from accessing high-quality lung cancer screening programs. Besides changing the screening criteria, barriers to access will need to be addressed to achieve maximal benefits of the lung cancer screening program.
Munish Luthra, MD, FCCP
Samantha D’Annunzio, MD
Steering Committee Members
Interprofessional team
Let food be thy medicine and medicine be thy food – Hippocrates
Recently an article published in The Lancet discussed malnutrition in the patient with COVID-19 infection requiring non-invasive ventilation (NIV) (Turner P, et al. Lancet. 2021 Apr 3;397[10281]:126). It is known that COVID-19 infection causes hyperinflammation and hypercatabolism, resulting in disruption of metabolic pathways leading to muscle wasting, including cardiac muscle dysfunction, muscle weakness, and prolonged fatigue (Singer PJ, et al. 2021. Intensive Med. In press).
Lipids, specifically DHA and EPA, are known to inhibit cyclooxygenase enzyme and may suppress prostaglandin production and block platelet-activating factor. Consumption of carbohydrates with high glycemic indexes can result in free radical synthesis (increasing inflammatory cytokines C reactive protein, tumor necrosis alpha and interleukin-6). Other nutrients known to have an anti-inflammatory role include vitamins A & D, selenium, and copper. Vitamin A is known to enhance an antigen-specific immune response. Probiotics may also play a role in enhancing the immune response (Turner P, et al. 2021. Lancet. 2021 Apr 3;397[10281]:1261).
Patients requiring NIV encounter impaired tolerance to oral nutrition, and enteral nutrition (EN) is prescribed (Singer PJ, et al. 2021. Intensive Med. In press). Advantages of EN are maintenance of gut integrity and intestinal permeability as well as down regulation of the inflammatory response and insulin resistance. Furthermore, negative energy balance is associated with poor outcomes. Better focus on nutrition assessment practices is needed to overcome energy deficits during treatment of COVID-19 pneumonia. An interprofessional team approach increases use of nutritional scores and optimizes nutritional interventions.
If oral nutrition is feasible, prescribing small, frequent meals and high‐protein, calorically dense foods can ensure adequate caloric intake. (Behrens S, et al. Nutr Clin Pract. 2021 Feb;36[1]:105-9). When EN is indicated, the Intensive Care Society endorses the use of fine bore feeding tubes and NIV masks with special nasogastric tube adapters to reduce mask leak. Head-of-bed elevation and avoidance of bolus feeding improve EN tolerance (Pardo T, et al. 2021. Anaesth Crit Care Pain Med. 2020 Dec;39[6]:738-9).
*Due to the novelty of this disease information is limited and further study is warranted.
David W. Unkle, MSN, APN, FCCP
Robert Baeten, DMSc, PA-C, FCCP
Nikky Keer, DO
NetWork Steering Committee Members
Occupational and environmental health
Not just COVID in the air
Particulate matter (PM) is a specific type of air pollution referred to by its size in micrometers. A direct correlation has been shown between non-accidental death and PM2.5 concentration with a 1.5% increase in daily mortality (Schwartz J, et al. J Air Waste Manag Assoc. 1996 Oct;46[10]:927-39). From 2000-2019, PM2.5 concentrations have steadily decreased over 43% (Environmental Protection Agency). Significant decline in air pollution has occurred early in the COVID-19 pandemic. PM2.5 declined in counties from states instituting early non-essential business closures in the U.S. Additionally, NASA models revealed a nearly 20% drop in global nitrogen dioxide concentrations using a COVID-19-free 2020 model to compare with actual space and ground-based observations since February 2020 (NASA Model Reveals How Much COVID-related Pollution Levels Deviated from the Norm. 2020 Nov 17. The pandemic has shown that there is a significant human behavior-driven contribution to air pollution. The historic fire season of 2020 in the western states contributed to record high air pollution with attributable mortality (Liu X, et al. medRxiv 2020.09.20197921). Additionally, the COVID-19 pandemic impeded firefighting response (Burke M, et al. PNAS. 2021;11[2]:e2011048118).
Despite the pandemic related reduction, racial-ethnic disparities continue to exist in consumption of PM2.5. In a model looking at production of PM2.5, defined as consumption by the consumer and exposure as where the product or service originated, African American and Hispanic individuals have up to 12-21% greater pollution exposure within the United States (Tessum CW, et al. Proc Natl Acad Sci USA. 2019 Mar 26;116[13]:6001-6). PM pollution increased the risk of asthma attacks corresponding to zip codes with higher poverty levels and eligibility to Medicaid (O’Lenick CR, et al. Epidemiol Community Health. 2017 Feb;71[2]:129-36). Other studies have shown people with a lower socioeconomic position, have less education, live nearer to major sources of pollution, greater reliance on public transportation and unemployment are at higher risk from effects of PM pollution (American Lung Association. Disparities in the impact of air pollution.
Disclaimer: The views expressed in this article are those of the author(s) and do not reflect the official policy of the Department of Army/Navy/Air Force, Department of Defense, or US government.
Tyler Church, DO
Fellow-in-Training Member
Bathmapriya Balakrishnan, MD
Dixie Harris, MD
NetWork Steering Committee Members