Journal CHEST®
By Launois, MD, PhD, and colleagues
One of the pitfalls in the interpretation of the effect of treatment adherence on health outcomes is the healthy-adherer effect (HAE) bias. Healthy-adherer bias occurs when patients who are treatment-adherent tend to actively seek out preventative care and engage in other healthy behaviors. Incomplete adjustment for such behaviors can lead to spurious inferences regarding study outcomes because healthy behaviors are associated with a reduced risk of many poor health outcomes.
This study demonstrates that HAE proxies (adherence to CV active drugs, no history of smoking, or sleepiness-related car accidents) were associated with subsequent PAP adherence after adjustment for confounders. PAP-adherent patients used less health care resources before PAP initiation. Unfortunately, the study did not measure other healthy behaviors (nutrition, physical activity, psychosocial support) that could also potentially explain HAE. Until the HAE associated with PAP adherence is better understood, clinicians should use caution when interpreting the association of PAP adherence with CV health outcomes and health care resource use.
CHEST
Dr. Sai Venkateshiah
– Commentary by Sai Venkateshiah, MD, FCCP, Member of the CHEST Physician Editorial Board
CHEST® Critical Care
By Alladina, MD, and colleagues
Practitioners in the intensive care unit have become increasingly aware that the population of patients with ARDS is highly heterogenous not only in terms of the inciting factors of their condition but also in terms of their respiratory physiology. Calfee and co-workers opened new horizons for us with their 2014 descriptions of two phenotypes of ARDS based upon biological markers that had different clinical outcome profiles. The work by Alladina et al adds to this body of knowledge by studying biomarkers from patients with COVID-ARDS who were receiving anti-inflammatory therapies. These researchers demonstrated that in such patients, endothelial biomarkers, particularly NEDD9, were associated with 60-day mortality. Increased understanding of biologic phenotypes in ARDS patients may facilitate the application of precision medicine to patients with this condition, improving outcome prediction and allowing practitioners to target specific treatments to selected patients.
CHEST
Dr. Daniel Ouellette
– Commentary by Daniel R. Ouellette, MD, FCCP, Critical Care Commentary Editor of CHEST Physician
CHEST® Pulmonary
By Horne, PhD, MStat, MPH, and colleagues
Trigger avoidance is one the most important interventions in the control of symptoms and prevention of exacerbations in chronic airways diseases. Nevertheless, trigger avoidance is at times not possible. This is the case with wildfire smoke and other environmental irritants—an increasing global health problem. Using data from 11 hospitals along the Utah’s Wasatch Front, the study by Horne and colleagues shows a clear association between a short-term increase in ambient fine particulate matter exposure resulting from wildfires and a surge in asthma exacerbations. This effect was also seen in patients with COPD but to a lesser degree. The study is limited by its observational design and because measurements of pollution levels were performed regionally and not at individual patient level. Yet this study offers valuable insights on the effects of environmental exposures in patients with chronic airways diseases and the consequences to our health care systems. Futures studies are still needed to assess the long-term consequences of sustained exposures to these irritants in patients with respiratory conditions.
CHEST
Dr. Diego J. Maselli
– Commentary by Diego J. Maselli, MD, FCCP, Member of the CHEST Physician Editorial Board