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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-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 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: 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.

Obesity

Obesity

The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in adipocytes...

Asthma III: Clinical Manifestations

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,...

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Related Experiment Video

Updated: May 26, 2026

Intraperitoneal Glucose Tolerance Test, Measurement of Lung Function, and Fixation of the Lung to Study the Impact of Obesity and Impaired Metabolism on Pulmonary Outcomes

Intraperitoneal Glucose Tolerance Test, Measurement of Lung Function, and Fixation of the Lung to Study the Impact of Obesity and Impaired Metabolism on Pulmonary Outcomes

Published on: March 15, 2018

Obesity and asthma disease phenotypes.

Amanda R Stream¹, E Rand Sutherland

¹Department of Medicine, University of Colorado, Colorado, USA.

Current Opinion in Allergy and Clinical Immunology

|December 14, 2011

Summary

Obesity significantly increases asthma risk and severity, making it harder to control. Weight loss may improve asthma symptoms and lung function, highlighting a distinct obese asthma phenotype.

Area of Science:

Pulmonology
Metabolic Disorders
Clinical Phenotyping

Background:

Rising prevalence of asthma and obesity presents a significant public health challenge.
Obesity is a major risk factor for developing asthma.
Obese individuals with asthma often experience increased morbidity and healthcare utilization.

Purpose of the Study:

To review recent data on the obese asthmatic as a distinct clinical phenotype.
To explore the association between obesity and asthma risk, severity, and control.
To examine the impact of obesity on asthma management and treatment responsiveness.

Main Methods:

Review of epidemiologic research defining the obesity-asthma association.
Analysis of physiological abnormalities linked to both obesity and asthma.

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Examination of inflammatory pathways in obese asthmatics.

Assessment of comorbid conditions and weight loss effects.

Main Results:

Obesity is a significant risk factor for asthma development and exacerbation.
Asthma in obese patients is frequently more difficult to control.
Obese asthmatics show reduced responsiveness to standard controller therapies.
Systemic and airway inflammation likely mediate reduced treatment efficacy in obese asthmatics.

Conclusions:

Obesity profoundly impacts asthma risk, severity, and control.
The obese asthmatic represents a distinct phenotype with unique inflammatory and physiological characteristics.
Further research is needed to elucidate the mechanisms by which obesity modifies asthma phenotypes.