ABSTRACT
Multiple breath nitrogen washout (MBNW) indices provide insight into ventilation heterogeneity globally [lung clearance index (LCI)] and within acinar (Sacin) and conducting (Scond) airways. Normal aging leads to an accelerated deterioration of Sacin in older adults, but little is known about the contribution of peripheral airway function to changes in pulmonary function indices reflecting expiratory airflow [forced expiratory volume in one second (FEV1)/forced vital capacity (FVC)] and gas trapping [residual volume (RV)/total lung capacity (TLC)] with aging. We aimed to examine associations between MBNW and FEV1/FVC as well as RV/TLC in healthy adults, and to determine if these relationships differ in older (≥50 yr) versus younger subjects (<50 yr). Seventy-nine healthy adult volunteers aged 23-89 yr with no cardiac or respiratory disease and a smoking history of <5 pack-years underwent spirometry, plethysmography, and MBNW. After adjustment for sex, height, and body mass index, the following relationships were present across the entire cohort: Sacin was inversely related to FEV1/FVC (R2 = 0.22, P < 0.001); Sacin and Scond were positively related to RV/TLC (R2 = 0.53, P < 0.001); on separate analyses, the relationship between Sacin and FEV1/FVC was strongest in the older group (R2 = 0.20, P = 0.003) but markedly weaker in the younger group (R2 = 0.09, P = 0.04); and Sacin and Scond were related to RV/TLC in older (R2 = 0.20, P = 0.003) but not younger subgroups. No relationships were observed between LCI and FEV1/FVC or RV/TLC. Changes in FEV1/FVC and RV/TLC are at least in part due to changes in peripheral airway function with aging. Further studies of the relationships between MBNW and standard pulmonary function indices may prove useful for their combined application and interpretation in obstructive airways disease. NEW & NOTEWORTHY This study explores associations between multiple breath nitrogen washout (MBNW) and standard pulmonary function indices reflecting expiratory airflow [forced expiratory volume in one second (FEV1)/forced vital capacity (FVC)] and gas trapping [residual volume (RV)/total lung capacity (TLC)] in healthy adults across a wide range of ages. We have demonstrated statistically significant relationships between MBNW and FEV1/FVC as well as RV/TLC. These findings provide novel evidence of the contribution of peripheral airway function to changes in standard pulmonary function indices with aging.
Subject(s)
Aging/physiology , Bronchioles/physiology , Adult , Aged , Cross-Sectional Studies , Female , Healthy Volunteers , Humans , Male , Middle Aged , Respiratory Function TestsSubject(s)
Bronchi , Pneumonectomy/instrumentation , Prostheses and Implants/adverse effects , Aged , Humans , MaleABSTRACT
Inhaled therapies play a significant role in the management of cystic fibrosis patients. Mucolytic and airway-rehydrating agents improve mucociliary clearance and respiratory functional status. Nebulized antibiotherapy achieve high local concentration, while reducing systemic toxicity. Tolerance to inhaled treatments is good excepting frequent bronchoconstriction which can usually be prevented by prior administration of beta2-mimetics. The majority of treatments are only available in liquid formulations. Thus, nebulization is the most frequently used inhalation mode. Vibrating-mesh nebulizers have significantly reduced inhalation time.
Subject(s)
Cystic Fibrosis/therapy , Respiratory Therapy/methods , Administration, Inhalation , Anti-Bacterial Agents/administration & dosage , Anti-Inflammatory Agents/administration & dosage , Bronchodilator Agents/administration & dosage , Cystic Fibrosis/drug therapy , Deoxyribonuclease I/administration & dosage , Humans , Mucociliary Clearance/drug effects , Nebulizers and Vaporizers , Respiratory Therapy/trends , Saline Solution, Hypertonic/administration & dosageABSTRACT
Lung transplantation has now been performed for more than 30 years in patients with end-stage chronic obstructive pulmonary disease (COPD). This disease is the major indication for lung transplantation, involving more than one third of the procedures worldwide. Although lung transplantation in COPD patients has clearly shown a positive impact on lung function, exercise capacity and quality of life, the survival benefit remains difficult to ascertain. Several methodological difficulties, particularly the absence of classical randomised studies, make the analysis especially challenging. There is however indirect but convincing evidence that lung transplantation can, when appropriate selection criteria are applied, provide not only an active post-transplant lifestyle but also a survival benefit for patients with COPD.
Subject(s)
Lung Transplantation , Pulmonary Disease, Chronic Obstructive/surgery , Evidence-Based Medicine , Humans , Outcome Assessment, Health Care , Pulmonary Disease, Chronic Obstructive/mortalityABSTRACT
An 89-year-old patient was admitted to the emergency department (ED) because of sudden onset of chest pain. The chest radiograph appeared to show a detachment of the pleura on the right side. The diagnosis of a pneumothorax was made. Insertion of a chest tube was indicated, but the patient refused her consent. The next day, another chest radiograph was taken. It showed no more detachment of the pleura. The initial diagnosis of pneumothorax had to be abandoned as retrospectively the pneumothorax could be identified as an artefact. Different aspects of pseudopneumothorax are discussed.
