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Asthma is a common pulmonary condition defined by chronic inflammation of respiratory tubes, tightening of respiratory smooth muscle, and episodes of bronchoconstriction. [1] The Centers for Disease Control and Prevention estimate that 1 in 11 children and 1 in 12 adults have asthma in the United States of America. [1]
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.
Respiratory disease is a common and significant cause of illness and death around the world. In the US, approximately one billion common colds occur each year. [29] A study found that in 2010, there were approximately 6.8 million emergency department visits for respiratory disorders in the U.S. for patients under the age of 18. [30]
The term reactive airway disease originally began to appear in medical literature in the 1980s in reference to asthmatic patients with hyperactive airways, which is a common feature of asthma. This feature is characterized by increased bronchoconstriction reactions in response to stimuli that should not elicit so strong of response.
In normal respiratory function, the air flows in through the upper airway, down through the bronchi and into the lung parenchyma (the bronchioles down to the alveoli) where gas exchange of carbon dioxide and oxygen occurs. [7]
492 Emphysema. 492.0 Emphysematous bleb; 492.8 Other emphysema; 493 Asthma. 493.0 Extrinsic asthma; 493.1 Intrinsic asthma; 493.2 Chronic obstructive asthma; 494 Bronchiectasis; 495 Extrinsic allergic alveolitis; 496 Chronic airway obstruction, not elsewhere classified 496.0 COPD, Not Otherwise Specified
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