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In 2000-2001 asthma prevalence was monitored at 6.5%; by 2010-2011 a 4.3% increase was shown, with asthma prevalence totaling 10.8% of Canada's population. [29] Furthermore, asthma prevalence varies among the provinces of Canada; the highest prevalence is Ontario at 12.1%, and the lowest is Nunavut at 3.8%. [29]
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.
Acute severe asthma, also known as status asthmaticus, is an acute exacerbation of asthma that does not respond to standard treatments of bronchodilators (inhalers) and corticosteroids. [2] Asthma is caused by multiple genes , some having protective effect, with each gene having its own tendency to be influenced by the environment although a ...
Asthma, particularly severe asthma, is strongly associated with development of chronic obstructive pulmonary disease (COPD). [31] [32] [33] Those with asthma, especially if it is poorly controlled, are at increased risk for radiocontrast reactions. [34] Cavities occur more often in people with asthma. [35]
Asthma is divided into two subgroups: atopic (extrinsic) and non-atopic (intrinsic). The atopic subgroup is closely associated with family history of the disease, whereas the non-atopic subgroup has its onset in adulthood and it is not caused by inheritance. It is known that non-atopic asthma has a more severe clinical course than atopic asthma.
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.
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").
Asthma is a respiratory disease that can begin or worsen due to exposure at work and is characterized by episodic narrowing of respiratory airways. Occupational asthma has a variety of causes, including sensitization to a specific substance, causing an allergic response; or a reaction to an irritant that is inhaled in the workplace.