The client receives 200 mg of a medication on a consistent schedule. How much drug is in the body at 4 half-lives?
387.5
375
393.8
350
The Correct Answer is B
Here's the process for calculating the drug concentration after multiple half-lives:
First half-life: After 1 half-life, 50% of the original dose remains in the body.
200 mg x 0.50 = 100 mg remains after 1 half-life.
Second half-life: After 2 half-lives, 50% of the remaining drug will be eliminated.
100 mg x 0.50 = 50 mg remains after 2 half-lives.
Third half-life: After 3 half-lives, 50% of the remaining drug will be eliminated again.
50 mg x 0.50 = 25 mg remains after 3 half-lives.
Fourth half-life: After 4 half-lives, 50% of the remaining drug will be eliminated once more.
25 mg x 0.50 = 12.5 mg remains after 4 half-lives.
Now, we need to sum up the amount of drug remaining in the body at each half-life:
After 4 half-lives, there are 12.5 mg left from the original dose.
Total drug in the body after 4 half-lives = 200 mg - 12.5 mg = 375 mg.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A) Planning: The planning phase involves setting goals and determining the actions needed to achieve those goals. While the nurse may have planned to administer the medications through the nasogastric tube, the specific actions of crushing the tablets, mixing them with fluid, and administering them fall under a different phase. Therefore, planning is not the correct phase for the actions described.
B) Diagnosis: The diagnosis phase is when the nurse identifies and formulates nursing diagnoses based on data collected about the patient’s health status. The actions of preparing and administering medication do not fall under this phase, as diagnosis pertains to assessing health problems or needs.
C) Evaluation: Evaluation is the phase where the nurse assesses whether the goals or outcomes of the care plan have been met. The nurse would evaluate the effectiveness of the medication administration after it has been done, but the actual action of giving the medication is part of implementation, not evaluation.
D) Implementation: Implementation is the phase where the nurse carries out the planned interventions, including administering medications. In this case, the nurse is taking specific steps to prepare and administer the crushed tablets down the nasogastric tube, which is a direct action related to the care plan. This phase involves performing the tasks necessary to carry out the interventions that were decided during the
planning phase.
E) Assessment: Assessment involves collecting data about the client’s health status, such as physical examination, history, and vital signs. The actions taken to crush and administer medications are not part of the assessment phase, which focuses on gathering information, not delivering care.
Correct Answer is C
Explanation
A) Problems that cause severe discomfort to the client: While addressing discomfort is important in providing holistic care, it is not the highest priority in nursing. The nurse’s primary focus should be on life-threatening issues or those that could deteriorate the client’s condition rapidly. Severe discomfort can be managed once immediate threats to life are addressed.
B) Problems the client deems most important: Although it’s essential to consider the client’s perspective and involve them in their care plan, problems that are most important to the client may not always be the most urgent or life-threatening. For example, the client may prioritize pain management, but addressing life-threatening issues must always take precedence.
C) Problems that are immediately life-threatening for the client: This is the correct answer. According to Maslow’s hierarchy of needs and the nursing prioritization framework, life-threatening problems should always be the nurse's first priority. These are issues that, if not addressed immediately, can lead to death or severe complications. For instance, airway obstruction, severe bleeding, or shock would require immediate intervention.
D) Problems that are identified as priority by the physician: While the physician’s orders and priorities should be taken into consideration, the nurse must independently assess and prioritize care based on the overall health status of the client. This includes using clinical judgment to identify life-threatening conditions, even if they are not explicitly stated in the physician’s orders. Nurses are trained to identify priority issues through their assessments and are responsible for making decisions that ensure the client’s safety.
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