Asthma | |
---|---|
This is an image of an asthmatics airways, it become swollen and full of mucous. | |
Pronunciation | |
Specialty | Pulmonology |
Symptoms | Recurring episodes of wheezing, coughing, chest tightness, shortness of breath[3] |
Complications | Gastroesophageal reflux disease (GERD), sinusitis, obstructive sleep apnea |
Usual onset | Childhood |
Duration | Long term[4] |
Causes | Genetic and environmental factors[3] |
Risk factors | Air pollution, allergens[4] |
Diagnostic method | Based on symptoms, response to therapy, spirometry[5] |
Treatment | Avoiding triggers, inhaled corticosteroids, salbutamol[6][7] |
Frequency | Approx. 262 million (2019)[8] |
Deaths | Approx. 461,000 (2019)[8] |
Asthma is a long-term inflammatory disease of the airways of the lungs.[4] It is characterized by variable and recurring symptoms, reversible airflow obstruction, and easily triggered bronchospasms.[9][10] Symptoms include episodes of wheezing, coughing, chest tightness, and shortness of breath.[3] These may occur a few times a day or a few times per week.[4] Depending on the person, asthma symptoms may become worse at night or with exercise.[4]
Asthma is thought to be caused by a combination of genetic and environmental factors.[3] Environmental factors include exposure to air pollution and allergens.[4] Other potential triggers include medications such as aspirin and beta blockers.[4] Diagnosis is usually based on the pattern of symptoms, response to therapy over time, and spirometry lung function testing.[5] Asthma is classified according to the frequency of symptoms of forced expiratory volume in one second (FEV1), and peak expiratory flow rate.[11] It may also be classified as atopic or non-atopic, where atopy refers to a predisposition toward developing a type 1 hypersensitivity reaction.[12][13]
There is no known cure for asthma, but it can be controlled.[4] Symptoms can be prevented by avoiding triggers, such as allergens and respiratory irritants, and suppressed with the use of inhaled corticosteroids.[6][14] Long-acting beta agonists (LABA) or antileukotriene agents may be used in addition to inhaled corticosteroids if asthma symptoms remain uncontrolled.[15][16] Treatment of rapidly worsening symptoms is usually with an inhaled short-acting beta2 agonist such as salbutamol and corticosteroids taken by mouth.[7] In very severe cases, intravenous corticosteroids, magnesium sulfate, and hospitalization may be required.[17]
In 2019 asthma affected approximately 262 million people and caused approximately 461,000 deaths.[8] Most of the deaths occurred in the developing world.[4] Asthma often begins in childhood,[4] and the rates have increased significantly since the 1960s.[18] Asthma was recognized as early as Ancient Egypt.[19] The word asthma is from the Greek ἆσθμα, âsthma, which means 'panting'.[20]