Attacks can be triggered by a wide variety of allergens such as pollen, dust, feathers...ect.
During an attack:
Muscle in the walls of the bronchi and bronchioles contracts, thus reducing the diameter of the airways.
Mucus secreting cells lining the airways go into slight over drive and start producing lots of mucus.
Mast cells resppond by producing histamine which causes the linings of the airways to become inflamed and swollen.
Blood vessels dilate and become leaky, causing the bronchi to fill with fluid.
Breathing becomes inccreasingly difficult and because less air can reach the alveoli there is a danger of lack of oxygen to the brain which could be fatal.
Treatment:
Avoiding exposure to allergens.
Using drugs such as antihistamines to relax muscles and reduce inflammation.
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