Current Opinion in Pulmonary Medicine最新文献

Purpose of review: Combined pulmonary fibrosis and emphysema (CPFE) is a syndrome characterized by upper lobe emphysema with lower lobe fibrosis. We aim to bring some clarity about its definition, nature, pathophysiology, and clinical implications.

Recent findings: Although multiple genetic and molecular pathways have been implicated in the development of CPFE, smoking is considered the most prevalent risk factor. CPFE is most prevalent in middle-aged men with more than 40 pack-years of smoking and can be seen in about 8% of all chronic obstructive pulmonary disease (COPD) patients. Given its nature, it is a radiological diagnosis, better defined by computed tomography (CT). Spirometry can be normal despite severe disease or can have restrictive or obstructive patterns, but the diffusing capacity of the lungs (DLCO) is consistently low regardless of the spirometry pattern. The disease is progressive, with high occurrences of lung cancer and pulmonary hypertension, complications that limit survival. Unfortunately, there is no treatment found to be beneficial other than supportive care and guideline-directed medical therapy.

Summary: CPFE is best described as a clinical and radiological syndrome where smokers are particularly at greater risk. Although simplistic, the earliest definition based chiefly on radiographic findings can identify a patient population with similar physiology. The most recent consensus proposes the definition based on mainly radiological findings with impaired gas exchange.

Purpose of review: Post-tuberculosis lung disease (PTLD) is an increasingly recognized and debilitating consequence of pulmonary tuberculosis (PTB). In this review, we provide a comprehensive overview of PTLD with airflow obstruction (PTLD-AFO), focusing on its burden, pathophysiology, clinical manifestations, diagnostic methods, and management strategies.

Recent findings: The relationship between PTLD and airflow obstruction is complex and multifactorial. Approximately 60% of the patients with PTLD have some spirometric abnormality. Obstruction is documented in 18-22% of PTLD patients. The host susceptibility and host response to mycobacterium drive the pathogenic mechanism of PTLD. A balance between inflammatory, anti-inflammatory, and fibrotic pathways decides whether an individual with PTB would have PTLD after microbiological cure. An obstructive abnormality in PTLD-AFO is primarily due to destruction of bronchial walls, aberrant healing, and reduction of mucosal glands. The most common finding on computed tomography (CT) of thorax in patients with PTLD-AFO is bronchiectasis and cavitation. Therefore, the 'Cole's vicious vortex' described in bronchiectasis applies to PTLD. A multidisciplinary approach is required for diagnosis and treatment. The disability-adjusted life-years (DALYs) attributed to PTLD represent about 50% of the total estimated burden of DALYs due to tuberculosis (TB). Patients with PTLD require comprehensive care that includes psychosocial support, pulmonary rehabilitation, and vaccination against respiratory pathogens. In the absence of trials evaluating different treatments for PTLD-AFO, therapy is primarily symptomatic.

Summary: PTLD with airflow obstruction has considerable burden and causes a significant morbidity and mortality. However, many aspects of PTLD-AFO still need to be answered. Studies are required to evaluate different phenotypes, especially concerning Aspergillus -related complications. The treatment should be personalized based on the predominant phenotype of airflow obstruction. Extensive studies to understand the exact burden, pathogenesis, and treatment of PTBLD-AFO are needed.

Purpose of review: Every type of dry powder inhaler (DPI) device has its own intrinsic resistance. A patient's inspiratory effort produces a pressure drop that determines the inspiratory flow, depending on the inhaler's specific internal resistance. Optimal peak inspiratory flow (PIF) is needed for effective release of dry powder, disaggregation of drug-carrier agglomerates, and optimal deposition of respirable drug particles, particularly generation of a high fine-particle fraction to reach the small airways of the lungs. However, standardized recommendations for PIF measurements are lacking and instructions appeared vague in many instances.

Recent findings: Suboptimal PIFs are common in outpatient chronic obstructive pulmonary disease (COPD) patients and during acute exacerbations of COPD, and are associated with increased healthcare resource utilization. There is significant variation in the results of studies which is in part related to different definitions of optimal flow rates, and considerable variation in how PIF is measured in clinical and real-life studies.

Summary: Standardization of technique will facilitate comparisons among studies. Specific recommendations for PIF measurement have been proposed to standardize the process and better ensure accurate and reliable PIF values in clinical trials and clinical practice. Clinicians can then select and personalize the most appropriate inhaler for their patients and help them achieve the optimal PIF needed for effective drug dispersion.

Purpose of review: Currently available evidence supporting the use of supplemental oxygen therapy (SOT) in chronic obstructive pulmonary disease (COPD) is complex, and data on the mortality reduction associated with SOT usage in patients with severe daytime resting hypoxemia have not been updated since the development of other treatments.

Recent findings: No reduction in mortality was found when SOT was used in patients with moderate resting daytime, isolated nocturnal, or exercise-induced hypoxemia. However, some of these patients obtain other significant benefits during SOT, including increased exercise endurance, and a mortality reduction is possible in these 'responders'. The adverse effects of long-term oxygen therapy also need to be considered, such as reduced mobility and social stigma. Furthermore, conservative SOT could improve outcomes in the setting of COPD exacerbations compared with higher concentration oxygen regimens. Compared with usual fixed-dose SOT, automated oxygen administration devices might reduce dyspnea during exercise and COPD exacerbations.

Summary: Current recommendations for SOT need to be revised to focus on patients who respond best and benefit most from this therapy. A conservative approach to SOT can reduce side effects compared with higher concentration oxygen regimens, and automated oxygen administration devices may help to optimize SOT.

Purpose of review: This review holds significant relevance and is timely; as of June 2022, the United States Accreditation Council of Graduate Medical Education (ACGME) formally recognized interventional pulmonary medicine as a novel subspecialty with a unique fellowship training program pathway beyond Pulmonary and Critical Care Medicine. This recognition stands as a culmination of extensive efforts spanning decades, aimed at establishing a specialized training program for interventional pulmonary medicine beyond traditional Pulmonary and Critical Care Fellowship in the United States. Globally, there are apprenticeship models in non-US programs with ongoing efforts to further standardize training in interventional pulmonary medicine. It underscores the progressive evolution and innovative nature inherent to this subspecialty, signifying a distinctive leap forward in medical education and practice, which calls for further inventive development of training tools and standardized educational delivery.

Recent findings: Newly discovered insights from the recent literature review will highlight methodologies of procedural education and innovative training approaches. These findings will underscore the significance of standardized curriculum development within the field as well as ongoing challenges.

Summary: Identifying and addressing future challenges in integrating new technologies into clinical education and broadening the educational scope of trainees in this newly recognized subspecialty is crucial for enhancing competency. The implications of moving toward a more standardized process, creating new clinical pathways with research, and adopting emerging minimally invasive technologies aim to impact patient outcomes in both nonmalignant and malignant thoracic diseases. This progressive shift is redefining the specialty, moving beyond specific procedures, and pivoting towards a more distinct educational pathway. Such a transformation will lead to more diverse, comprehensive, and evidence-based driven patient care delivery.

Purpose of review: The purpose of this review is to compile recent data on the clinical associations of computed tomography (CT) scan findings in the literature and potential avenues for implementation into clinical practice.

Recent findings: Airways dysanapsis, emphysema, chronic bronchitis, and pulmonary vascular metrics have all recently been associated with poor chronic obstructive pulmonary disease (COPD) outcomes when controlled for clinically relevant covariables, including risk of mortality in the case of emphysema and chronic bronchitis. Other authors suggest that CT scan may provide insight into both lung parenchymal damage and other clinically important comorbidities in COPD.

Summary: CT scan findings in COPD relate to clinical outcomes. There is a continued need to develop processes to best implement the results of these studies into clinical practice.

Purpose of review: There has been a rapid increase in silicosis cases, particularly related to artificial stone. The key to management is avoidance of silica exposure. Despite this, many develop progressive disease and there are no routinely recommended treatments. This review provides a summary of the literature pertaining to pharmacological therapies for silicosis and examines the plausibility of success of such treatments given the disease pathogenesis.

Recent findings: In-vitro and in-vivo models demonstrate potential efficacy for drugs, which target inflammasomes, cytokines, effector cells, fibrosis, autophagy, and oxidation.

Summary: There is some evidence for potential therapeutic targets in silicosis but limited translation into human studies. Treatment of silicosis likely requires a multimodal approach, and there is considerable cross-talk between pathways; agents that modulate both inflammation, fibrosis, autophagy, and ROS production are likely to be most efficacious.