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Related Concept Videos

Asthma: Pathogenesis and Management01:20

Asthma: Pathogenesis and Management

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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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Asthma-I: Introduction01:29

Asthma-I: Introduction

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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...
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Asthma-II: Pathophysiology and Classification01:26

Asthma-II: Pathophysiology and Classification

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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:
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Asthma-III: Symptoms and Complications01:24

Asthma-III: Symptoms and Complications

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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
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Asthma I: Introduction01:28

Asthma I: Introduction

112
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...
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Asthma III: Clinical Manifestations01:13

Asthma III: Clinical Manifestations

49
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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Bronchial Thermoplasty: A Novel Therapeutic Approach to Severe Asthma
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Formaldehyde asthma--rare or overlooked?

H Nordman, H Keskinen, M Tuppurainen

    The Journal of Allergy and Clinical Immunology
    |January 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Formaldehyde-induced asthma, though rare, is likely underreported. Occupational exposure can cause sensitization, but removing exposure improves symptoms, though low home exposure may prolong them.

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    Effects of Exposure of Formaldehyde to a Rat Model of Atopic Dermatitis Induced by Neonatal Capsaicin Treatment
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    Symptom Assessment of Patients with Allergic Rhinitis Using an Allergen Exposure Chamber
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    Symptom Assessment of Patients with Allergic Rhinitis Using an Allergen Exposure Chamber

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    Area of Science:

    • Occupational Medicine
    • Pulmonology
    • Toxicology

    Background:

    • Asthma-like respiratory symptoms following formaldehyde exposure are a concern in occupational settings.
    • Formaldehyde is a common industrial chemical with potential respiratory irritant properties.

    Observation:

    • A study examined 230 individuals occupationally exposed to formaldehyde with asthma-like symptoms.
    • Bronchial provocation tests with formaldehyde were administered to all subjects.
    • 12 cases were identified as specific sensitization to formaldehyde, with symptom onset after 1 month to 19 years of exposure.

    Findings:

    • Eleven of the 12 formaldehyde-sensitized individuals reacted to approximately 2.5 mg/m³ of formaldehyde.
    • One sensitized individual reacted to 1.2 mg/m³.
    • Beclomethasone dipropionate inhalation blocked a late reaction in one patient.
    • Bronchial hyperreactivity was observed in 71 of 218 non-reacting subjects.

    Implications:

    • Formaldehyde-induced asthma may be underdiagnosed.
    • Occupational removal from formaldehyde exposure is beneficial for symptom management.
    • Continued low-level domestic exposure can perpetuate symptoms in sensitized individuals.