Chest
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Accelerated aging has been proposed as a pathologic mechanism of various chronic diseases, including COPD. This concept has almost exclusively been approached by analyses of individual markers. We investigated whether COPD is associated with accelerated aging using a panel of markers representing various interconnected aspects of the aging process. ⋯ Markers of the aging mechanism represent distinct molecular aspects of aging. Among them, different markers were altered in COPD, but only telomere length was consistently associated with lung function, and seems a useful marker for expressing accelerated aging in COPD.
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OSA has a familial aggregation pattern indicating that it can be partially caused by a genetic component. However, the heritability of OSA has been estimated based on the study of families of obese probands of urban populations with established OSA diagnosis. The objective of this genetic-epidemiologic study is to study families ascertained from a general rural population to determine an unbiased estimate of OSA heritability. ⋯ The heritability of AHI in a rural population with low levels of obesity is intermediate (25%).
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Respiratory virus infections are commonly associated with COPD exacerbations, but little is known about the mechanisms linking virus infection to exacerbations. Pathogenic mechanisms in stable COPD include oxidative and nitrosative stress and reduced activity of histone deacetylase-2 (HDAC2), but their roles in COPD exacerbations is unknown. We investigated oxidative and nitrosative stress (O&NS) and HDAC2 in COPD exacerbations using experimental rhinovirus infection. ⋯ O&NS, airways inflammation, and impaired HDAC2 may be important mechanisms of virus-induced COPD exacerbations. Therapies targeting these mechanisms offer potential new treatments for COPD exacerbations.
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Case Reports
A 26-Year-Old Woman With Systemic Lupus Erythematosus Presenting With Orthopnea and Restrictive Lung Impairment.
A 26-year-old white woman diagnosed with systemic lupus erythematosus (SLE) presented with left shoulder pain and a three-pillow orthopnea. Lupus was diagnosed at age 21 years when she developed arthritis, and she has been maintained on prednisone (2.5 mg) and mycophenolate (500 mg bid). In the course of evaluating her new symptoms, imaging revealed a small left pleural effusion with exudative characteristics on a diagnostic thoracentesis, but there was no evidence of infection. ⋯ Three months later, she presented to our clinic with worsening six-pillow orthopnea, such that she usually slept with 45° truncal elevation on a recliner at night. She was unable to lie flat. Her dyspnea was worse in the mornings, and she described having to "gasp" for air.
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Among patients with OSA, a higher number of medical morbidities are known to be associated with those who have obesity hypoventilation syndrome (OHS) compared with OSA alone. OHS can pose a higher risk of postoperative complications after elective noncardiac surgery (NCS) and often is unrecognized at the time of surgery. The objective of this study was to retrospectively identify patients with OHS and compare their postoperative outcomes with those of patients with OSA alone. ⋯ Better emphasis is needed on preoperative recognition of hypercapnia among patients with OSA or overlap syndrome undergoing elective NCS.