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The bronchial spasm is due to the activation of parasympathetic nervous system. Postganglionic parasympathetic fibers will release acetylcholine causing the constriction of the smooth muscle layer surrounding the bronchi. These smooth muscle cells have muscarinic M 3 receptors on their membrane.
Bronchospasm or a bronchial spasm is a sudden constriction of the muscles in the walls of the bronchioles. It is caused by the release (degranulation) of substances from mast cells or basophils under the influence of anaphylatoxins. It causes difficulty in breathing which ranges from mild to severe.
Lower airway, bronchial, or bronchus tone is mediated both by the innervation of airway smooth musculature and, possibly, also by the innervation of airway mucosal vasculature. Lower airway smooth muscles are mostly only innervated by the vagus nerve.
Asthma is a common long-term inflammatory disease of the airways of the lungs. [4] Asthma occurs when allergens, pollen, dust, or other particles, are inhaled into the lungs, causing the bronchioles to constrict and produce mucus, which then restricts oxygen flow to the alveoli.
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 ]
The effects of bronchial thermoplasty on smooth muscle mass are seen up to at least 12 months post-treatment; however, the procedure does not seem to impact other features of airway remodelling. [4] Thus far, no pharmacological treatment modality for asthma has been developed nor shown to prevent or attenuate the progression of airway remodelling.
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