The nurse must monitor the trough level of medication.
When would the nurse order the trough level?
4 hours before the next scheduled dose.
24 hours after the drug was given.
30 minutes before the administration of the drug.
1 hour after the medication has been infused.
The Correct Answer is C
Choice A rationale
Ordering a trough level 4 hours before the next scheduled dose would likely result in an inaccurate reading. The trough level represents the lowest concentration of a drug in the bloodstream, typically occurring just before the next dose, ensuring that the drug concentration remains within the therapeutic range to exert its pharmacological effect.
Choice B rationale
Obtaining a trough level 24 hours after the drug was given is too late and would not provide an accurate assessment of the drug's lowest concentration before the subsequent dose. By this time, depending on the drug's half-life, the concentration may be significantly lower or undetectable, making it irrelevant for therapeutic monitoring.
Choice C rationale
The trough level of a medication is measured to ensure that the drug concentration remains above the minimum effective concentration and below toxic levels. Collecting the blood sample 30 minutes before the administration of the next dose allows the drug to reach its lowest concentration in the systemic circulation, providing an accurate representation of the drug's true trough level.
Choice D rationale
Measuring the drug level 1 hour after the medication has been infused would represent a concentration much closer to the peak level, not the trough. The peak level indicates the maximum drug concentration, typically occurring shortly after administration or infusion, and is used to assess for potential toxicity or adequate absorption.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
Albuterol is a selective beta-2 adrenergic agonist. Its primary action is bronchodilation by stimulating beta-2 receptors in the bronchial smooth muscle, leading to relaxation and widening of the airways. It does not directly suppress the cough reflex, which is a protective mechanism to clear airways. Cough suppression is typically achieved by antitussive medications acting on the central nervous system or peripheral cough receptors.
Choice B rationale
Albuterol is a short-acting beta-agonist (SABA), characterized by a rapid onset of action and relatively short duration (4-6 hours). Therefore, it is used for immediate relief of bronchospasm and acute symptoms of asthma, not for long-term daily maintenance. Long-term maintenance medications include inhaled corticosteroids or long-acting beta-agonists (LABAs) used consistently to control inflammation and prevent exacerbations.
Choice C rationale
Albuterol's rapid onset of action and potent bronchodilatory effects make it the ideal medication for acute relief of bronchospasm in asthma. It is used as a "rescue" inhaler to quickly open airways during an asthma attack or before exercise to prevent exercise-induced bronchospasm. This immediate effect is crucial for alleviating respiratory distress.
Choice D rationale
Post-tussive emesis, or vomiting after coughing, is often a symptom of severe coughing spells. While albuterol can alleviate coughing by reducing bronchospasm, its primary mechanism is not to prevent emesis directly. Emesis is a gastrointestinal reflex; albuterol's action is primarily on the respiratory system. Addressing the underlying cause of severe coughing would indirectly reduce emesis.
Correct Answer is ["4"]
Explanation
Step 1 is 1640 - 1200 = 440.
Step 2 is 440 = 4: PM.
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