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Related Concept Videos

Asthma-I: Introduction01:29

Asthma-I: Introduction

Asthma is a chronic respiratory ailment that requires careful management due to its varying symptoms and influencing factors. It is characterized by airway inflammation, bronchial hyperresponsiveness, and reversible airflow obstruction, leading to symptoms like wheezing, shortness of breath, chest tightness, and coughing. The symptom frequency and intensity may vary considerably over time. It is also linked to immune system responses to allergens and irritants, highlighting the complex...
Asthma-II: Pathophysiology and Classification01:26

Asthma-II: Pathophysiology and Classification

Asthma is a prevalent chronic respiratory condition marked by inflammation and hyperresponsiveness of the airways. Its pathophysiology involves complex interactions among inflammatory pathways, immune responses, and neural mechanisms.
Additionally, environmental and genetic factors play crucial roles in determining an individual's susceptibility to asthma and the severity of their condition.
Critical processes in asthma pathophysiology include:
Asthma I: Introduction01:28

Asthma I: Introduction

Asthma is a chronic inflammatory disorder of the airways characterized by variable airflow obstruction and heightened bronchial responsiveness to a wide range of triggers. The underlying inflammation leads to airway swelling, mucus hypersecretion, and smooth muscle constriction, all of which narrow the airway lumen and impede airflow. Clinically, asthma presents with recurrent episodes of wheezing, shortness of breath, chest tightness, and coughing, symptoms that typically vary in intensity and...
Asthma III: Clinical Manifestations01:13

Asthma III: Clinical Manifestations

Asthma presents with a characteristic pattern of episodic respiratory symptoms that reflect underlying airway inflammation, bronchoconstriction, and mucus hypersecretion. Although severity varies among individuals, certain clinical manifestations are considered hallmarks of the disorder and often guide diagnosis and assessment.Respiratory SymptomsA persistent cough is one of the most common early features of asthma. It is frequently dry and tends to worsen at night or in the early morning,...
Chronic Obstructive Pulmonary Disease II: Emphysema01:23

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 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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A Reversible, Non-invasive Method for Airway Resistance Measurements and Bronchoalveolar Lavage Fluid Sampling in Mice
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Published on: April 14, 2010

Cigarette smoke-sensitive asthma: challenge studies.

R P Stankus1, P K Menon, R J Rando

  • 1Department of Medicine, Tulane Medical School, New Orleans, La 70112.

The Journal of Allergy and Clinical Immunology
|September 1, 1988
PubMed
Summary
This summary is machine-generated.

Environmental tobacco smoke significantly impairs pulmonary function in one-third of asthma patients, causing symptoms like cough and chest tightness. This effect is reproducible and not linked to tobacco leaf allergies.

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Area of Science:

  • Pulmonary Medicine
  • Environmental Health
  • Allergy and Immunology

Background:

  • Asthma patients often report respiratory issues upon exposure to environmental tobacco smoke (ETS).
  • Previous exposure to cigarette smoke has been linked to symptoms like cough, shortness of breath, and chest tightness in sensitive individuals.

Purpose of the Study:

  • To assess the impact of passive ETS exposure on pulmonary function in individuals with asthma.
  • To determine the percentage of asthma patients experiencing pulmonary function decline due to ETS.
  • To investigate potential associations between ETS response and atopy or tobacco leaf hypersensitivity.

Main Methods:

  • Twenty-one subjects with asthma and self-reported smoke sensitivity were exposed to controlled levels of mechanically produced tobacco smoke in an inhalation chamber.
  • Pulmonary function, specifically FEV1 (Forced Expiratory Volume in 1 second), was measured before and after exposure.
  • Responses were assessed for reproducibility, and associations with serum IgE antibodies and skin test reactivity to tobacco leaf extract were examined.

Main Results:

  • A significant decline (greater than 20%) in FEV1 was observed in 7 out of 21 (33%) subjects during ETS exposure.
  • The observed pulmonary function changes were reproducible in the reactive subjects.
  • No association was found between ETS-induced pulmonary response and serum IgE levels or positive skin tests to tobacco leaf extract, indicating the effect is not due to hypersensitivity.

Conclusions:

  • A substantial percentage (33%) of smoke-sensitive asthma patients experience significant pulmonary function impairment upon ETS exposure.
  • The study dissociates the observed pulmonary effects from specific hypersensitivity to tobacco leaf components.
  • These findings highlight the detrimental impact of ETS on asthma control and underscore the need for avoidance.