Use of Beta-blockers in patients with bronchospasms
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Why should beta-blockers be used cautiously in patients with a history of bronchospasms? A) They may induce bronchospasm due to beta-receptor blockade. B) They increase mucous production. C) They enhance lung capacity. D) They reduce oxygen saturation.
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Let's examine why beta blockers should be used with caution in patients who have a history of bronchospasms.
Beta-Blockers and Respiratory Safety
To understand this, we need to look at the different types of beta receptors in the body and what they do.
| Receptor | Primary Location | Effect of Stimulation |
|---|---|---|
| Beta-1 | Heart | Increases Heart Rate |
| Beta-2 | Lungs (Bronchioles) | Bronchodilation (Opening) |
Beta two receptors are responsible for relaxing the smooth muscles in the airway. When these receptors are stimulated, it leads to bronchodilation, which helps breathing.
However, beta blockers, especially non-selective ones, blocks these receptors. When you block a receptor that is supposed to open the airway, you get the opposite effect.
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