A client frequently takes diphenhydramine (Benadryl) to alleviate his upper respiratory symptoms associated with allergies. Which of the following mechanism of actions applies to diphenhydramine (Benadryl)?
stimulates effects of histamine by occupying all H receptor sites.
blocks effects of histamine by competing and occupying H1 receptor sites.
blocks effects of histamine by competing and occupying H2 receptor sites.
stimulates effects of histamine by increasing amount of H2 receptor sites.
The Correct Answer is B
A. Stimulates effects of histamine by occupying all H receptor sites: This statement inaccurately describes the action of diphenhydramine. Instead of stimulating histamine effects, diphenhydramine actually blocks them, particularly at H1 receptors, which are involved in allergic responses.
B. Blocks effects of histamine by competing and occupying H1 receptor sites: This accurately describes the mechanism of action of diphenhydramine. As an antihistamine, it competes with histamine for binding to H1 receptor sites, effectively reducing symptoms of allergies, such as sneezing, itching, and nasal congestion.
C. Blocks effects of histamine by competing and occupying H2 receptor sites: This option is incorrect because H2 receptor antagonists are used primarily to reduce gastric acid secretion, not to treat allergic reactions. Diphenhydramine specifically targets H1 receptors, not H2 receptors.
D. Stimulates effects of histamine by increasing the amount of H2 receptor sites: This statement is also incorrect. Diphenhydramine does not stimulate histamine activity or increase receptor sites. Instead, it functions to inhibit the action of histamine at H1 receptors, which is fundamental in alleviating allergy symptoms.
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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.
Correct Answer is ["B","D","E","F"]
Explanation
A) Ipratropium is the drug of choice for acute asthma exacerbations: This statement is incorrect. While ipratropium is used in the management of asthma, it is not the first-line treatment for acute exacerbations. Short-acting beta-agonists, such as albuterol, are the preferred choice for rapid relief during an acute asthma attack due to their quick onset of action.
B) Mechanism of action includes blocking acetylcholine receptors in the airway: This statement is accurate. Ipratropium is an anticholinergic agent that works by blocking acetylcholine receptors in the bronchial smooth muscle. This action leads to bronchodilation and helps to decrease mucus production, making it effective for managing airway constriction.
C) Mechanism of action includes antagonizing histamine receptors of the upper airway: This statement is incorrect. Ipratropium does not act on histamine receptors; rather, it specifically targets acetylcholine receptors. Antihistamines are the medications that block histamine receptors, primarily used for allergic reactions and rhinitis, but not for bronchodilation in asthma.
D) Client's who are allergic to soybean should avoid taking ipratropium: This statement is true. Ipratropium bromide may contain soy lecithin, which can pose a risk for patients with soybean allergies. Therefore, it is essential for healthcare providers to assess a patient’s allergy history before prescribing this medication.
E) Urinary retention is a side effect of Ipratropium bromide: This is correct. Anticholinergic medications, including ipratropium, can lead to urinary retention as a side effect due to their action of inhibiting acetylcholine, which plays a role in bladder function. Patients should be monitored for this side effect, especially if they have a history of urinary issues.
F) Ipratropium (Atrovent) is a medication for asthma and chronic obstructive pulmonary disease (COPD): This statement is accurate. Ipratropium is indicated for both asthma and COPD management, as it helps to relieve bronchospasm and improve airflow. It is often used as an adjunct therapy in combination with other bronchodilators for better management of respiratory conditions.