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The airways of asthma patients are "hypersensitive" to certain triggers, also known as stimuli (see below). (It is usually classified as type I hypersensitivity.) [4] [5] In response to exposure to these triggers, the bronchi (large airways) contract into spasm (an "asthma attack").
When queried, asthma patients may report that their first asthma symptoms began after an acute lower respiratory tract illness. This type of history has been labelled the "infectious asthma" (IA) syndrome, [ 133 ] or as "asthma associated with infection" (AAWI) [ 134 ] to distinguish infection-associated asthma initiation from the well known ...
Very severe acute asthma (termed "near-fatal" as there is an immediate risk to life) is characterised by a peak flow of less than 33% predicted, oxygen saturations below 92% or cyanosis (blue discoloration, usually of the lips), absence of audible breath sounds over the chest ("silent chest" : wheezing is not heard because there is not enough ...
Asthma is a common condition and affects over 300 million people around the world. [3] Asthma causes recurring episodes of wheezing, breathlessness, chest tightness, and coughing, particularly at night or in the early morning. [4] Exercise-induced asthma is common in asthmatics, especially after participation in outdoor activities in cold weather.
Furthermore, patients with asthma are found to have an increased release of type II cytokines, especially IL4 and IL5, but a normal or low level of type I cytokine production. Similarly, M. pneumoniae infection promotes a T helper type 2 response, which is why M. pneumoniae -positive patients with asthma have increased airways expression of ...
An estimated 22 million American adults had asthma in the US that year, according to the Centers for Disease Control and Prevention. Nearly 30,800 US adults with asthma were included in the study.
It is also preferred due to the former term giving the false impression that asthma is caused by exercise. In a patient with EIB, exercise initially follows the normal patterns of bronchodilation. However, by three minutes, the constriction sets in, which peaks at around 10–15 minutes, and usually resolves itself by an hour.
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