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Related Concept Videos

Atelectasis II: Pathophysiology01:10

Atelectasis II: Pathophysiology

Atelectasis develops when alveoli lose their air and collapse inward. Because lung tissue is naturally elastic, these air sacs shrink rather than remaining open. Collapsed alveoli are no longer ventilated, reducing their role in gas exchange. Blood flow may continue in these regions, creating a ventilation–perfusion mismatch. Clinical findings include decreased breath sounds, dullness to percussion, reduced chest expansion, and decreased tactile fremitus as sound transmission through collapsed...
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Chronic Obstructive Pulmonary Disease II: Emphysema

Emphysema, a major phenotype of chronic obstructive pulmonary disease (COPD), is characterized by irreversible destruction of alveolar walls and permanent enlargement of distal airspaces. Unlike chronic bronchitis, which primarily affects the airways, emphysema predominantly involves the lung parenchyma, where structural damage leads to airflow limitation.PathophysiologyIt most commonly results from prolonged exposure to cigarette smoke and other toxic gases, particularly cigarette smoke.
Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

Chronic Obstructive Pulmonary Disease-II: Pathophysiology

Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
Chronic Inflammation
Alveoli and Alveolar Ducts01:26

Alveoli and Alveolar Ducts

The respiratory zone of the human body, which stands in contrast to the conducting zone, comprises the structures that actively participate in the exchange of gases. The initiation of this zone is marked by the terminal bronchioles converging into respiratory bronchioles, the tiniest bronchiole classification. The respiratory bronchioles give way to the alveolar ducts that opens into a congregation of alveoli. Actively involved in gas exchange, alveoli resemble tiny sacs similar to clusters of...
Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...
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Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
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Visualizing Lung Cellular Adaptations during Combined Ozone and LPS Induced Murine Acute Lung Injury
14:48

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Published on: March 21, 2021

Diffuse alveolar damage.

V Poletti1, G L Casoni, A Cancellieri

  • 1Department of Diseases of the Thorax, Morgagni-Pierantoni Hospital, Forlì, Italy. venerino.poletti@gmail.com

Pathologica
|March 25, 2011
PubMed
Summary
This summary is machine-generated.

Diffuse alveolar damage (DAD) presents distinct temporal changes, including edema and hyaline membranes acutely, myofibroblast accumulation and cell proliferation in later stages, and fibrosis. Diagnosis is often possible via small lung biopsies.

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Area of Science:

  • Pulmonary Pathology
  • Histopathology
  • Respiratory Medicine

Background:

  • Diffuse alveolar damage (DAD) is a key histopathologic finding in acute lung injury.
  • DAD exhibits characteristic time-dependent pathological changes.

Purpose of the Study:

  • To describe the temporal histopathologic findings in diffuse alveolar damage.
  • To highlight diagnostic approaches for DAD.

Main Methods:

  • Review of histopathologic features of DAD.
  • Analysis of diagnostic yield from different biopsy types.

Main Results:

  • Acute phase: intra-alveolar/interstitial edema, hyaline membranes.
  • Proliferative phase: myofibroblast accumulation, type II alveolar cell hyperplasia.
  • Advanced phase: fibrosis.
  • Diagnosis is feasible on transbronchial lung biopsy and cytology specimens.

Conclusions:

  • DAD has distinct acute, proliferative, and fibrotic phases.
  • Minimally invasive biopsy techniques are often sufficient for DAD diagnosis.
  • Surgical lung biopsy is infrequently required.