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 C
Explanation
A) Montelukast (Singulair): This medication is a leukotriene receptor antagonist used to manage asthma and allergic rhinitis. It does not contain soy or soy-derived ingredients, making it a safe option for a client with a soybean allergy. There are no known contraindications related to soy in this medication.
B) Methylprednisolone (Solumedrol): This is a corticosteroid used to reduce inflammation. It is not contraindicated for clients with a soybean allergy, as it does not contain soy-derived components. The medication primarily poses risks related to long-term use, but not specifically regarding soybean allergies.
C) Ipratropium bromide (Atrovent): This medication is an anticholinergic used to relieve bronchospasm. Ipratropium bromide is formulated with soy lecithin, which is derived from soybeans. Therefore, it is contraindicated for clients with a known allergy to soybeans, as it may trigger an allergic reaction.
D) Albuterol (Ventolin): This medication is a short-acting beta-agonist used for quick relief of bronchospasm. It does not contain any soy components and is generally safe for patients with soybean allergies. While there may be other considerations for its use, the allergy to soy is not a concern with this medication.
Correct Answer is A
Explanation
A. Use this inhaler 15 minutes prior to physical activity: This is the correct recommendation for cromolyn. It is a mast cell stabilizer that helps prevent asthma symptoms by inhibiting the release of inflammatory mediators. Using it before physical activity can help minimize exercise-induced bronchospasm.
B. Tachycardia is an adverse effect associated with this medication: This statement is misleading. Cromolyn is not typically associated with tachycardia as an adverse effect. Unlike bronchodilators, which can cause increased heart rate, cromolyn primarily works to stabilize mast cells and has a different side effect profile.
C. This medication should not be discontinued abruptly: While it is generally good practice to consult a healthcare provider before stopping any asthma medication, cromolyn does not have a significant risk of withdrawal symptoms like corticosteroids might. It is more important to maintain regular use for effectiveness rather than fear abrupt discontinuation.
D. Injections are required weekly to properly prevent asthma attacks: This statement is incorrect. Cromolyn is administered via inhalation, not by injection, and does not require weekly injections. Patients should use the inhaler as prescribed, typically several times a day, depending on their individual treatment plan.