A nurse is discussing how beta blockers work to decrease blood pressure with a nursing student. Which statement by the student indicates a need for further teaching?
“Beta blockers decrease the release of renin.”
“Beta blockers decrease peripheral vascular resistance.”
“Beta blockers decrease heart rate and contractility.”
“Beta blockers block the actions of angiotensin II.”
The Correct Answer is B
Choice A reason: Beta blockers decrease renin release, reducing angiotensin II and aldosterone, which lowers blood pressure. This statement is accurate, reflecting correct understanding, so it does not indicate a need for further teaching.
Choice B reason: Beta blockers do not primarily decrease peripheral vascular resistance; they reduce heart rate and contractility. Peripheral resistance is more affected by alpha blockers or vasodilators, so this incorrect statement indicates a need for further teaching.
Choice C reason: Beta blockers reduce heart rate and myocardial contractility, decreasing cardiac output and blood pressure. This statement is correct, showing proper understanding, so it does not require additional teaching.
Choice D reason: While beta blockers do not directly block angiotensin II, they reduce its production by decreasing renin. The statement is imprecise but not entirely wrong, making it less indicative of a teaching need than choice B.
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Related Questions
Correct Answer is D
Explanation
Choice A reason: To calculate the volume, divide the ordered dose (8 mg) by the concentration (5 mg/mL): 8 ÷ 5 = 1.6 mL. Choice A (1.4 mL) underestimates the volume, delivering only 7 mg (1.4 × 5), which is insufficient for the prescribed dose, making it incorrect for accurate medication administration.
Choice B reason: Calculating 8 mg ÷ 5 mg/mL yields 1.6 mL. Choice B (1.8 mL) would deliver 9 mg (1.8 × 5), exceeding the ordered dose. This overdose could increase the risk of sedation or respiratory depression, as Valium (diazepam) is a benzodiazepine with potent CNS effects, making this choice incorrect.
Choice C reason: The correct volume is 8 mg ÷ 5 mg/mL = 1.6 mL. Choice C (1.2 mL) delivers only 6 mg (1.2 × 5), which is below the prescribed dose. This underdose could result in inadequate therapeutic effects, such as insufficient anxiety relief or seizure control, making it an incorrect choice.
Choice D reason: Dividing the ordered dose (8 mg) by the concentration (5 mg/mL) gives 8 ÷ 5 = 1.6 mL. This volume accurately delivers the prescribed 8 mg of Valium, ensuring therapeutic efficacy for conditions like anxiety or seizures while minimizing risks of over- or under-dosing, making it the correct choice.
Correct Answer is C
Explanation
Choice A reason: Inhaled glucocorticoids, like budesonide, reduce airway inflammation over time but don’t act quickly enough to abort acute asthma attacks. Short-acting beta-agonists (e.g., albuterol) are used for acute relief, as glucocorticoids lack immediate bronchodilatory effects, making this choice incorrect for chronic asthma management.
Choice B reason: Using inhaled glucocorticoids only in emergencies is ineffective for chronic asthma. These drugs prevent inflammation and exacerbations through consistent use, not acute intervention. Emergency use is reserved for rescue inhalers like albuterol, making this choice inappropriate for long-term asthma control.
Choice C reason: Inhaled glucocorticoids require daily use to maintain anti-inflammatory effects, reducing airway hyperresponsiveness and preventing asthma exacerbations. Consistent dosing ensures steady suppression of chronic inflammation, improving lung function and reducing symptoms, making this the correct choice for managing chronic asthma effectively.
Choice D reason: A 2-week on/off schedule disrupts the consistent anti-inflammatory action of inhaled glucocorticoids needed for chronic asthma control. Intermittent use reduces efficacy, allowing inflammation to rebound, increasing exacerbation risk. Daily use is standard to maintain therapeutic benefits, making this choice incorrect.
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