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Asthma I: Introduction

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: Symptoms and Complications

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-I: Introduction

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 Classification

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-IV: Diagnostic and Management

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:

Asthma: Pathogenesis and Management

Asthma: Pathogenesis and Management

Asthma is a chronic pulmonary condition involving inflammation of the airways, hyper-reactivity, and reversible obstruction of the airways. This condition can significantly impact a person's quality of life, making breathing difficult and leading to distressing symptoms.
Asthma is classified as allergic and non-allergic. Allergens such as dust mites, pollen, and pet dander trigger allergic asthma, while factors like cold air, intense emotions, or exercise can induce non-allergic asthma.

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Related Experiment Video

Updated: Jun 17, 2026

Murine Model of Allergen Induced Asthma

Murine Model of Allergen Induced Asthma

Published on: May 14, 2012

Different definitions in childhood asthma: how dependable is the dependent variable?

K E Van Wonderen¹, L B Van Der Mark, J Mohrs

¹Academic Medical Center - University of Amsterdam, Division of Clinical Methods and Public Health, Dept of General Practice, P.O. Box 22700 1100 DD, Amsterdam, The Netherlands. k.vanwonderen@amc.uva.nl

The European Respiratory Journal

|December 25, 2009

Summary

Different asthma definitions significantly impact prevalence estimates and prediction model performance in children. Standardizing these definitions is crucial for consistent clinical decision-making in pediatric asthma diagnosis.

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Last Updated: Jun 17, 2026

Murine Model of Allergen Induced Asthma

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Published on: May 14, 2012

Methodology for Sputum Induction and Laboratory Processing

Methodology for Sputum Induction and Laboratory Processing

Published on: December 17, 2017

Area of Science:

Pediatric respiratory medicine
Clinical epidemiology
Biostatistics

Background:

Predictive modeling in medicine often focuses on predictor selection, with less emphasis on outcome definition.
The definition of childhood asthma varies widely across studies, potentially affecting research findings and clinical practice.

Purpose of the Study:

To assess the impact of diverse asthma definitions on prevalence estimates and prediction model performance in children.
To evaluate the variability in clinical decision-making due to differing asthma diagnostic criteria.

Main Methods:

Systematic literature search on PubMed for childhood asthma definitions (ages 6-18) in cohort studies.
Construction and comparison of four prediction models for childhood asthma at age 6 using a fixed predictor set and varying asthma definitions.
Analysis of prevalence estimates and the proportion of children falling within a defined clinical indecision zone (25%-60% posterior probability).

Main Results:

A review of 122 papers identified 60 distinct childhood asthma definitions.
Prevalence estimates for childhood asthma ranged from 15.1% to 51.1% based on the definition used.
The percentage of children in the clinical indecision range varied substantially, from 14.9% to 65.3%, depending on the asthma definition.

Conclusions:

The choice of asthma definition significantly influences prevalence rates and the performance of predictive models in pediatric populations.
Inconsistent operational definitions of asthma contribute to variability in clinical decision-making and research outcomes.
Greater uniformity in defining childhood asthma is necessary to improve consistency in research and clinical practice.