Journal CHEST®
By Xiaoting Wang, MM, and colleagues
This study from the Shanghai Sleep Health Study cohort enhances our understanding of physiologic endotypes in sleep apnea—nonpositional OSA (NPOSA) and positional OSA (POSA). The study found that nonanatomic traits play a more significant role in POSA severity. Patients with POSA exhibited lower arousal thresholds and greater ventilatory compensation, while anatomical abnormalities were more prominent in NPOSA. This research underscores the need for personalized treatment strategies based on specific endotypes, especially with the increasing emergence of alternatives to CPAP therapy, such as mandibular advancement therapy and hypoglossal nerve stimulation. Patients with obesity with NPOSA were found to have elevated loop gain, which is known to be impacted by weight loss. This is particularly relevant in light of recent studies showing that new GLP-1 agonists can dramatically reduce sleep apnea severity. Future research should focus on refining these personalized approaches and integrating alternative treatments to provide a more individualized approach to managing sleep apnea.
Commentary by Shyam Subramanian, MD, FCCP, Member of the CHEST Physician Editorial Board
CHEST® Pulmonary
By Fayez Kheir, MD, and colleagues
The novel mRNA genomic array, Envisia Genomic Classifier (EGC), used in this study has been shown to be highly specific for a histopathologic diagnosis of usual interstitial pneumonia (UIP). A diagnosis of UIP carries significant prognostic import as patients exhibit a higher risk for progressive fibrosis and death compared with other interstitial lung diseases (ILDs). In this retrospective study, the combination of bronchoscopic lung cryobiopsy and EGC testing was associated with a significant change in clinical management of those living with an indeterminate ILD. Participants were more likely to be started on antifibrotic therapy following this intervention. This study emphasizes the need for prospective trials on the diagnostic yield of molecular phenotyping with bronchoscopic lung biopsy compared with the traditional surgical approach for the undifferentiated ILD.
Commentary by Michael Marll, MD, Member of the CHEST Physician Editorial Board
CHEST® Critical Care
By Elizabeth Landzberg, MD, and colleagues
Respiratory illness is the most common reason for both hospitalization and ICU admission in children. Studies suggest inhaled corticosteroids (ICSs) may protect adults with direct lung injury (DLI) from developing respiratory failure. However, there is a paucity of literature on this therapeutic intervention within the pediatric population. This retrospective, large, single-center study identified children seeking treatment at the emergency department (ED) with DLI before hospitalization. ICS use before hospitalization was associated with one-half the odds of escalation to intubation and noninvasive respiratory support (NRS) in pediatric patients seeking treatment in the ED with DLI. The protective effect was greatest in patients with a history of asthma. According to the authors, this is the first study to assess ICS exposure before hospitalization and progression to respiratory failure in all-cause pediatric DLI. It highlights the need for future studies to evaluate whether a role exists for early prophylactic ICS use in pediatric DLI without status asthmaticus, stratified by history of asthma.
Commentary by Anne C. Coates, MD, FCCP, Member of the CHEST Physician Editorial Board