Asthma is a chronic inflammatory disorder causes due to immune responses leads to swelling and narrowing of airways causes wheezing, shortness of breath, chest tightness and coughing particularly at night or in early morning. It can be classified according to sign and symptoms, severity, forced expiration volume in 1 second (FEV1) and peak expiration flow rate.
1. Stimuli from external stimulus: Stimuli can be given by the following types-
a) Allergens (dust)
b) Medication: aspirin, penicillin
c) Exercise
d) Hormonal changes
All these are the stimulus which starts the immune responses leads to the development of Th-2 lymphocytes predominant immune response associated with atrophy lead to IgE-mediated inflammation. T-helper cells like cytokines participate to contribute inflammation of airways lead to hyperactive responses of IgE.
2. Bronchoconstriction: During asthma airways tract react with allergens produces mucus in large amount leads to difficulty in breath
3. Bronchial inflammation: After the immune response occurs mucus producing cells grow large and produces more mucus as cell mediated arm of immune system is activated and airways become highly inflamed.
Acetylcholine is the parasympathetic immunomodulator present in the smooth muscles of airways control the bronchoconstriction and production of mucus when this process get highly activated lead to asthma. Vagal tone is increased in the airways inflammation associated with asthma leads to exaggerated acetylcholine release. Acetylcholine controls this whole process by acting on muscrinic receptors m2 and m3. When parasympathetic activity increased in airways lead to inflammation so anticholinegic therapy is used which acts as bronchodilators.
1) Depending on the participation of allergens, asthma is divided into following types-
A. Atropic (Extrinsic) asthma
B. Non-atropic (intrinsic) A.
a) Cough variant asthma: In this type of asthma there is involvement of cough allergens with other symptoms of asthma.
b) Occupational asthma: This kind of asthma affects the people working in the area of high pollution due to the shortness of breath.
c) Exercise induced asthma: It is due to the condition of bronchoconstriction during the exercise.
d) Nocturnal asthma: amount of breath inhaled by a person is measured in FEV1Which is decreased by at least 15% from bed time includes the other symptoms of asthma which may disrupt the sleep and may wake up you from sleep.
e) Steroid resistant asthma: Peoples who regularly inhaled glcocorticoids may become unresponsive to that normal dose include other symptoms.
f) Health condition mimic asthma: Asthma may leads to other problems included cardiac arrhythmia, vocal cord dysfunction.
g) Child hood asthma: It is occur in children due to the hormonal changes.
h) Adult orient asthma: it is occur after the age of 20 more in women as compare to men due to plastic, pollution, mites.
i) Bronchial asthma: difficulty in breathing and wheezing, mucus of airways become narrow, thick mucus produced which causes irritation.
2. Classification of asthma based on severity:
A. Intermittent( moderate asthma)
B. Mild persistent( acute asthma)
C. Severe persistent( life threatening)
Pathogenesis of Asthma
It is an immunological disorder causes reversible air flow obstruction. Pathogenesis of this disorder can be divided into three steps.1. Stimuli from external stimulus: Stimuli can be given by the following types-
a) Allergens (dust)
b) Medication: aspirin, penicillin
c) Exercise
d) Hormonal changes
All these are the stimulus which starts the immune responses leads to the development of Th-2 lymphocytes predominant immune response associated with atrophy lead to IgE-mediated inflammation. T-helper cells like cytokines participate to contribute inflammation of airways lead to hyperactive responses of IgE.
2. Bronchoconstriction: During asthma airways tract react with allergens produces mucus in large amount leads to difficulty in breath
3. Bronchial inflammation: After the immune response occurs mucus producing cells grow large and produces more mucus as cell mediated arm of immune system is activated and airways become highly inflamed.
Acetylcholine is the parasympathetic immunomodulator present in the smooth muscles of airways control the bronchoconstriction and production of mucus when this process get highly activated lead to asthma. Vagal tone is increased in the airways inflammation associated with asthma leads to exaggerated acetylcholine release. Acetylcholine controls this whole process by acting on muscrinic receptors m2 and m3. When parasympathetic activity increased in airways lead to inflammation so anticholinegic therapy is used which acts as bronchodilators.
Types of Asthma
We can classify asthma in different order which keep you in different category which helps the doctors to prescribe you different treatment depending on the category type.1) Depending on the participation of allergens, asthma is divided into following types-
A. Atropic (Extrinsic) asthma
B. Non-atropic (intrinsic) A.
Atropic asthma
This type of asthma is also known as allergic asthma may be due to the continues exposure to allergens like smoke, dust mites, mold, animal dander and is mainly occur due to the immune responses.Non-atropic asthma
In this type of asthma there is not any involvement of allergens but may be due to other reasons. Depending on this it is of various types:a) Cough variant asthma: In this type of asthma there is involvement of cough allergens with other symptoms of asthma.
b) Occupational asthma: This kind of asthma affects the people working in the area of high pollution due to the shortness of breath.
c) Exercise induced asthma: It is due to the condition of bronchoconstriction during the exercise.
d) Nocturnal asthma: amount of breath inhaled by a person is measured in FEV1Which is decreased by at least 15% from bed time includes the other symptoms of asthma which may disrupt the sleep and may wake up you from sleep.
e) Steroid resistant asthma: Peoples who regularly inhaled glcocorticoids may become unresponsive to that normal dose include other symptoms.
f) Health condition mimic asthma: Asthma may leads to other problems included cardiac arrhythmia, vocal cord dysfunction.
g) Child hood asthma: It is occur in children due to the hormonal changes.
h) Adult orient asthma: it is occur after the age of 20 more in women as compare to men due to plastic, pollution, mites.
i) Bronchial asthma: difficulty in breathing and wheezing, mucus of airways become narrow, thick mucus produced which causes irritation.
2. Classification of asthma based on severity:
A. Intermittent( moderate asthma)
B. Mild persistent( acute asthma)
C. Severe persistent( life threatening)
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