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Related Concept Videos

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-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 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,...
Asthma-III: Symptoms and Complications01:24

Asthma-III: Symptoms and Complications

Asthma, a common chronic respiratory condition, is classified considering the frequency and severity of symptoms alongside lung function impairment. Understanding this classification is essential for appropriate treatment and management. Here's a detailed look at the classification of asthma and its clinical features and complications:
Classification of Asthma
Asthma-IV: Diagnostic and Management01:30

Asthma-IV: Diagnostic and Management

The diagnosis and management of asthma are comprehensive, encompassing clinical assessments, lung function tests, and pharmacological interventions. Here's an overview:
Clinical Assessment for Asthma:
This is the first step in diagnosing and managing asthma. It includes:

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Related Experiment Video

Updated: Jun 17, 2026

Methodology for Sputum Induction and Laboratory Processing
13:28

Methodology for Sputum Induction and Laboratory Processing

Published on: December 17, 2017

School variation in asthma: compositional or contextual?

Tracy K Richmond1, S V Subramanian

  • 1Division of Adolescent Medicine, Children's Hospital Boston, Boston, Massachusetts, United States of America. tracy.richmond@childrens.harvard.edu

Plos One
|December 31, 2009
PubMed
Summary
This summary is machine-generated.

Significant differences in childhood asthma rates exist between schools, even after accounting for individual and neighborhood factors. This suggests schools themselves may influence asthma prevalence in students.

Related Experiment Videos

Last Updated: Jun 17, 2026

Methodology for Sputum Induction and Laboratory Processing
13:28

Methodology for Sputum Induction and Laboratory Processing

Published on: December 17, 2017

Area of Science:

  • Pediatric epidemiology
  • Environmental health
  • Public health

Background:

  • Childhood asthma prevalence varies by neighborhood.
  • Less is known about variation in asthma prevalence between schools.
  • The study investigates if school-level asthma variation exists independently of individual risk factors.

Purpose of the Study:

  • Determine if significant between-school variation in asthma prevalence exists.
  • Assess if this variation is linked to individual risk factors or school contextual influences.

Main Methods:

  • Cross-sectional analysis of 16,640 adolescents (grades 7-12).
  • Asthma diagnosis reported by parents.
  • Two-level random effects models used to assess school contribution to asthma variance.

Main Results:

  • Highest quartile schools had 21.9% asthma prevalence vs. 7.1% in lowest quartile.
  • Schools significantly contributed to asthma variance (null model).
  • Controlling for individual, school, and neighborhood factors modestly reduced between-school variance.

Conclusions:

  • Significant between-school variation in asthma prevalence persists after controlling for known factors.
  • This indicates potential school-level contextual influences on asthma.
  • Further research is needed to identify mechanisms of school influence on asthma outcomes.