Bronchodilators are respiratory drugs used in the treatment of bronchospasm also referred to as bronchoconstriction. Bronchospasm occurs when the lungs become irritated resulting in the smooth muscle around the airways in the lungs (called bronchioles) to contract (tighten), resulting in less airflow passing through the lungs. When the smooth muscles contract, the inner diameter of the bronchus is narrowed and the mucosa becomes swollen and inflamed.
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This inflammation results in further narrowing of the airways. In addition, bronchial glands excrete sticky mucus which further obstructs the flow of air through the airways. These three factors bronchospasm, inflammation and the production of sticky mucus are all forms of obstruction. Obstruction in terms of respiratory therapy is any condition that causes blockage and prevents air from flowing through the airways. Obstruction results in an individual feeling short of breath.
”Asthma
http://nethealthbook.com/lung-disease/asthma-introduction/ (Links to an external site.)
The contraction and relaxation of the smooth muscles of the bronchioles is controlled by the autonomic nervous system. Bronchodilators are drugs that work by causing the bronchial muscles to relax, dilating the bronchioles and allowing easier airflow through the lungs. There are three types of bronchodilators: beta-adrenergic also referred to as beta-agonists, anticholinergics, and xanthines such as theophylline.
Beta2 adrenergic bronchodilators
Beta-adrenergic or beta2 agonist bronchodilators. work by stimulating beta2 (B2) receptor sites. Beta2 receptors are found in the smooth muscle of the airway, particularly the bronchioles. Stimulating Beta2 receptor sites results in bronchial smooth muscle relaxation referred to as bronchodilation. Bronchodilation results in the following:• An increase in how fast air can flow through the airways during expiration (flow rate)• Less resistance in the airways• A decrease in the amount of work the patient has to perform to move air into and out of the lungs (referred to as work of breathing).
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The post Bronchodilators are respiratory drugs used in the treatment of bronchospasm also referred to as bronchoconstriction. Bronchospasm occurs when the lungs become irritated resulting in the smooth muscle around the airways in the lungs (called bronchioles) to contract (tighten), resulting in less airflow passing through the lungs. When the smooth muscles contract, the inner diameter of the bronchus is narrowed and the mucosa becomes swollen and inflamed. appeared first on My Nursing Papers.
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