When caring for a client with an upper respiratory infection (URI), the nurse is notified the client is taking guaifenesin (Mucinex). What is the mechanism of action of guaifenesin (Mucinex)?
Stimulate alpha-adrenergic receptors, thus producing vascular constriction of capillaries in nasal mucosa
Compete with histamine for receptor sites, thus preventing a histamine response and overall congestion.
Treat allergic rhinitis and prevent motion sickness.
Loosen bronchial secretion to assist in elimination.
The Correct Answer is D
A. Stimulate alpha-adrenergic receptors, thus producing vascular constriction of capillaries in nasal mucosa: This describes the action of decongestants, not guaifenesin. Guaifenesin does not work by constricting blood vessels; rather, its primary function is to help manage mucus production.
B. Compete with histamine for receptor sites, thus preventing a histamine response and overall congestion: This mechanism is associated with antihistamines, which are used to relieve symptoms of allergic reactions, not with guaifenesin. Guaifenesin does not block histamine but focuses on mucus management.
C. Treat allergic rhinitis and prevent motion sickness: While these are common uses for antihistamines, they do not apply to guaifenesin. Guaifenesin is primarily an expectorant and is not indicated for treating allergic rhinitis or motion sickness.
D. Loosen bronchial secretion to assist in elimination: Guaifenesin acts as an expectorant, promoting the clearance of mucus from the airways by loosening bronchial secretions. This facilitates easier expectoration of mucus, helping to relieve chest congestion associated with upper respiratory infections.
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Correct Answer is ["A","C"]
Explanation
A) Decongestants: These medications are primarily used to relieve nasal congestion associated with upper respiratory conditions such as allergic rhinitis and the common cold. They work by constricting blood vessels in the nasal passages, thereby reducing swelling and congestion. Common examples include pseudoephedrine and phenylephrine.
B) H2 Antagonist: H2 antagonists are primarily used to reduce gastric acid secretion and treat conditions such as peptic ulcers and gastroesophageal reflux disease (GERD). They are not indicated for upper respiratory conditions, so this option does not apply.
C) H1 Antagonist: H1 antagonists, or antihistamines, are used to alleviate symptoms of allergies, hay fever, and other upper respiratory conditions by blocking the effects of histamine. This class includes both first-generation antihistamines (like diphenhydramine) and second-generation antihistamines (like cetirizine), making them relevant for upper respiratory issues.
D) Long-Acting Beta Agonist (LABA): LABAs are primarily used for the management of asthma and chronic obstructive pulmonary disease (COPD), targeting the lower respiratory tract. They are not typically used for upper respiratory conditions, so this option does not apply.
E) Short Acting Beta Agonist (SABA): SABAs, such as albuterol, are primarily used for acute asthma attacks and bronchospasm in conditions like COPD. They act on the lower respiratory tract and are not indicated for upper respiratory conditions.
F) Mast Cell Stabilizers: These medications are used to prevent allergic reactions and asthma symptoms by stabilizing mast cells and preventing the release of histamine and other inflammatory mediators. While they may have a role in allergic rhinitis, they are not the primary treatment for upper respiratory tract conditions, making this option less applicable compared to decongestants and H1 antagonists.
Correct Answer is B
Explanation
A) Ipratropium bromide: While ipratropium is used to manage bronchospasm, it is typically not the first choice for acute asthma attacks. It has a slower onset of action compared to short-acting beta-agonists like albuterol and is generally used as an adjunct therapy rather than for immediate relief.
B) Albuterol: This medication is a short-acting beta-agonist that provides rapid relief of bronchospasm during an acute asthma attack. It works by relaxing the muscles in the airways, making it the preferred first-line treatment for quick relief in asthma exacerbations.
C) Salmeterol: This medication is a long-acting beta-agonist (LABA) used for long-term control of asthma symptoms, not for immediate relief. It has a delayed onset of action and should not be used as a rescue medication during an acute attack, as it may take longer to provide effects.
D) Budesonide: This is an inhaled corticosteroid that helps in controlling chronic inflammation associated with asthma. While important for long-term management, it is not effective for the rapid relief of acute symptoms and should not be used during an asthma attack.