1. Articles from ajrccm.atsjournals.org

  2. 1-14 of 14
    1. Central Airway Compliance in Asthma: Up or Down? Good or Bad?

      Central Airway Compliance in Asthma: Up or Down? Good or Bad?

      In this issue of the Journal, Williamson and coworkers (pp. 612–619) report on the use of anatomical optical coherence tomography(OCT) to measure the luminal area of central intrathoracic airways (generations 0–5) (1). By coupling this dynamic, in vivomeasurement with simultaneously measured transpulmonary pressure, they derived area–pressure relationships of these airwaysand calculated airway compliance (Caw) and specific compliance(sCaw). They then compared these values in control subjects andthose with obstructive lung diseases: asthma, chronic obstructivepulmonary disease (COPD), and bronchiectasis. This is an excitinguse of a new technology, and their results are surprising.First described in 1991 (2 ...

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    2. Elastic Properties of the Central Airways in Obstructive Lung Diseases Measured Using Anatomical Optical Coherence Tomography

      Elastic Properties of the Central Airways in Obstructive Lung Diseases Measured Using Anatomical Optical Coherence Tomography
      Rationale: Our understanding of how airway remodeling affects regional airway elastic properties is limited due to technical difficulties in quantitatively measuring dynamic, in vivo airway dimensions. Such knowledge could help elucidate mechanisms of excessive airway narrowing. Objectives: To utilize anatomical optical coherence tomography (aOCT) to compare central airway elastic properties in control subjects and those with obstructive lung diseases. Methods: Following bronchodilation, airway lumen area (Ai) was measured using aOCT during bronchoscopy in control subjects (n=10) and those with asthma (n=16), chronic obstructive pulmonary disease (COPD) (n=9) and bronchiectasis (n=8). Ai was measured in each of ...
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    3. Advances in Diagnostic Bronchoscopy

      Advances in Diagnostic Bronchoscopy
      Diagnostic bronchoscopy has undergone two major paradigm shifts in the last 40 years. First, the advent of flexible bronchoscopy gave chest physicians improved access to the tracheobronchial tree with a rapid learning curve and greater patient comfort compared with rigid bronchoscopy. The second paradigm shift has evolved over the last 5 years with the proliferation of new technologies that have significantly enhanced the diagnostic capabilities of flexible bronchoscopy compared with traditional methods. At the forefront of these new technologies is endobronchial ultrasound. In its various forms, endobronchial ultrasound has improved diagnostic yield for pulmonary masses, nodules, intrathoracic adenopathy, and disease ...
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    4. New and Current Clinical Imaging Techniques To Study Chronic Obstructive Pulmonary Disease

      Chronic obstructive pulmonary disease (COPD) is a heterogeneous disease, characterized by both small airway and parenchymal abnormalities. There is increasing evidence to suggest that these two morphologic phenotypes, while related, may have different clinical presentations, prognosis and therapeutic responses to medications. With the advent of novel imaging modalities, it is now possible to evaluate these two morphologic phenotypes in large clinical studies using non or minially invasive methods such as computed tomography (CT), magentic resonance imaging (MRI) and optical coherence tomography (OCT). In this paper, we provide a pictorial overview of these modalities in the context of COPD and discuss ...

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    5. Gender Differences in Airway Wall Measurements with Optical Coherence Tomography (OCT).

      Purpose: To examine the difference in the relationship between airway wall dimensions and lung function in male and female smokers. Methods: 35 male and 18 female subjects from the BC Lung Health Cohort, who underwent OCT imaging and spirometry, were studied. OCT images, acquired at the time of bronchoscopy, were converted to digital images at 0.5s intervals using frame capture software. Airways were measured using ImageJ (NIH) image analysis software on 5 consecutive frames when the airway attained the diameter of the OCT probe (1.5mm) Lung function, represented by FEV1% predicted, was plotted against the wall area percent ...

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    6. Inter- and Intra-Observer Variability in Measurements of Airways Using Optical Coherence Tomography (OCT).

      Purpose: To devise a protocol for the measurement of airways using optical coherence tomography (OCT) with acceptable inter− and intra−observer variability. Methods: 59 subjects from the British Columbia Lung Health Cohort who underwent OCT imaging were studied. OCT images, acquired at the time of bronchoscopy were converted to digital images at 0.5s intervals using frame capture software. Airways were measured using ImageJ (NIH) image analysis software on 5 consecutive frames when the probe was located in an airway with the same diameter as the probe (1.5mm). The airway lumen and wall areas were measured using the circular ...

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    7. Airway Wall Thickness Assessed Using Computed Tomography and Optical Coherence Tomography

      Airway Wall Thickness Assessed Using Computed Tomography and Optical Coherence Tomography

      Rationale: Computed tomography (CT) has been shown to reliably measure the airway wall dimensions of medium to large airways. Optical coherence tomography (OCT) is a promising new micron-scale resolution imaging technique that can image small airways 2 mm in diameter or less. Objectives: To correlate OCT measurements of airway dimensions with measurements assessed using CT scans and lung function. Methods: Forty-four current and former smokers received spirometry, CT scans, and OCT imaging at the time of bronchoscopy. Specific bronchial segments were identified and measured using the OCT images and three-dimensional reconstructions of the bronchial tree using CT. Measurements and Main ...

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    1-14 of 14
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