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Dynamic hyperinflation is a phenomenon that occurs when a new breath begins before the lung has reached the static equilibrium volume. [1] In simpler terms, this means that a new breath starts before the usual amount of air has been breathed out, leading to a build-up of air in the lungs, and causing breathing in and out to take place when the lung is nearly full.
The increased total lung capacity (hyperinflation) can result in the clinical feature of a barrel chest – a chest with a large front-to-back diameter that occurs in some individuals with emphysematous COPD. Hyperinflation can also be seen on a chest X-ray as a flattening of the diaphragm. [citation needed]
However, in asthma, the airflow limitation usually completely resolves after exacerbations, whereas in COPD it may not. [1] ACO presents with a chronic airflow limitation or obstruction (due to inflammation), with characteristics of both asthma and COPD. Inflammation of the large and medium airways (classically seen with asthma) is seen in ACO. [1]
While prevalence is likely higher due to the fact that asthma can go undiagnosed and untreated, nearly 1 in 10 adults living in the United States likely has the condition per the U.S. Centers for ...
However, asthma is rarely the only symptom, and not all people with food or other allergies have asthma [17] Sulfite sensitivity Asthma can occur in reaction to ingestion or inhalation of sulfites, which are added to foods and wine as preservatives. [18] Salicylate sensitivity Salicylates can trigger asthma in sensitive individuals. Salicylates ...
Asthma phenotyping and endotyping has emerged as a novel approach to asthma classification inspired by precision medicine which separates the clinical presentations of asthma, or asthma phenotypes, from their underlying causes, or asthma endotypes. The best-supported endotypic distinction is the type 2-high/type 2-low distinction.
Asthma triggers are factors or stimuli that provoke the exacerbation of asthma symptoms or increase the degree of airflow disruption, which can lead to an asthma attack. [1] An asthma attack is characterized by an obstruction of the airway , hypersecretion of mucus and bronchoconstriction due to the contraction of smooth muscles around the ...
Air trapping represents poorly aerated lung, but on its own is clinically benign. It is a common problem for smokers who dive. On diving the lung volume collapses and pushes air into the poorly aerated regions. On arising from a deep depth, these air-trapped areas of lung expand. This places great pressure on the lung tissue which can rupture. [3]
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