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Related Concept Videos

Pneumonia II: Pathophysiology01:29

Pneumonia II: Pathophysiology

The pathophysiology of pneumonia involves the following steps:
Pneumonia I: Introduction01:29

Pneumonia I: Introduction

Pneumonia is an infection of the lower respiratory tract that leads to inflammation of the lung parenchyma, often resulting in the accumulation of inflammatory exudate in the alveoli and airways. Unlike the watery, low-protein fluid exudate in pulmonary edema, the exudate in this case is a thick fluid rich in immune cells, proteins, and debris produced during infection and inflammation.This impairs gas exchange and can lead to consolidation of lung tissue. The infection may be caused by a...
Pneumonia I: Introduction01:30

Pneumonia I: Introduction

Pneumonia is an acute respiratory infection that targets the lungs, specifically the alveoli. These tiny air sacs, essential for oxygen exchange, become engorged with pus and fluid, severely hindering breathing, decreasing oxygen absorption, and causing significant pain and discomfort during respiration.
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...
Chronic Obstructive Pulmonary Disease IV: Clinical Manifestations01:19

Chronic Obstructive Pulmonary Disease IV: Clinical Manifestations

Chronic Obstructive Pulmonary Disease, or COPD, is a long-term condition marked by persistent and only partially reversible airflow limitation. It involves two overlapping conditions—chronic bronchitis and emphysema—which often co-appear but differ in dominant symptoms and underlying mechanisms.Chronic Bronchitis FeaturesChronic bronchitis presents with a persistent productive cough and thick, sometimes purulent mucus due to airway inflammation, enlarged mucus glands, and goblet cell...
COPD: Pathogenesis and Clinical Features01:20

COPD: Pathogenesis and Clinical Features

Chronic obstructive pulmonary disease (COPD) is a group of lung conditions that progressively worsen over time, including chronic bronchitis and emphysema. This cluster of diseases collectively leads to a gradual and irreversible decline in lung function over time.
The primary cause for the onset of COPD is cigarette smoking and exposure to air pollution. These hazardous factors initiate a chain reaction within the lungs, resulting in chronic inflammation, damage to the airways, and a...
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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Updated: Jul 7, 2026

Assessment of the Cytotoxic and Immunomodulatory Effects of Substances in Human Precision-cut Lung Slices
12:04

Assessment of the Cytotoxic and Immunomodulatory Effects of Substances in Human Precision-cut Lung Slices

Published on: May 9, 2018

Hypersensitivity pneumonitis: clinical perspectives.

J Mark Madison1

  • 1University of Massachusetts Medical School, Department of Medicine, 55 Lake Ave N, Worcester, MA 01655, USA. mark.madison@umassmed.edu

Archives of Pathology & Laboratory Medicine
|February 7, 2008
PubMed
Summary
This summary is machine-generated.

Diagnosing hypersensitivity pneumonitis (HSP) is challenging due to its variable course. A multidisciplinary approach, including detailed history, imaging, and tests like bronchoalveolar lavage, aids in identifying this interstitial lung disease.

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Experimental Model to Evaluate Resolution of Pneumonia
09:49

Experimental Model to Evaluate Resolution of Pneumonia

Published on: February 17, 2023

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Last Updated: Jul 7, 2026

Assessment of the Cytotoxic and Immunomodulatory Effects of Substances in Human Precision-cut Lung Slices
12:04

Assessment of the Cytotoxic and Immunomodulatory Effects of Substances in Human Precision-cut Lung Slices

Published on: May 9, 2018

Experimental Model to Evaluate Resolution of Pneumonia
09:49

Experimental Model to Evaluate Resolution of Pneumonia

Published on: February 17, 2023

Area of Science:

  • Pulmonology
  • Immunology
  • Radiology

Background:

  • Hypersensitivity pneumonitis (HSP) presents with a highly variable clinical course.
  • Accurate diagnosis of HSP remains a significant clinical challenge for pulmonologists.

Purpose of the Study:

  • To review key clinical, radiographic, and laboratory findings for diagnosing hypersensitivity pneumonitis (HSP).
  • To offer a clinician-focused perspective on HSP diagnosis.

Main Methods:

  • Comprehensive literature review encompassing contemporary and historical research.
  • Integration of author's clinical experience and expert viewpoints.

Main Results:

  • Diagnosis requires a multidisciplinary approach.
  • Initial evaluation for unexplained dyspnea and interstitial lung disease should include environmental/occupational history.
  • Ancillary tests like serology, chest imaging, inhalation challenges, and bronchoalveolar lavage are crucial.

Conclusions:

  • A detailed patient history and targeted ancillary testing are essential for HSP diagnosis.
  • In ambiguous cases, lung biopsy is recommended for definitive diagnosis.
  • Multidisciplinary collaboration improves diagnostic accuracy for hypersensitivity pneumonitis.