HESI LPN
CAT Exam Practice
1. The healthcare provider prescribes potassium chloride 25 mEq in 500 ml D5W to infuse over 6 hours. The available 20 ml vial of potassium chloride is labeled '10 mEq/5 ml.' How many ml of potassium chloride should the nurse add to the IV fluid?
- A. 12.5
- B. 5
- C. 10
- D. 20
Correct answer: B
Rationale: To prepare 25 mEq of potassium chloride for the infusion, the nurse should add 5 ml of the 10 mEq/5 ml solution. This concentration provides the required amount of potassium chloride without exceeding the needed volume. Choice A would result in 12.5 mEq, which exceeds the prescribed amount. Choices C and D are incorrect as they do not align with the correct calculation based on the vial concentration.
2. When designing a plan of care for a client diagnosed with pheochromocytoma, a goal statement should be prepared that relates to which topic?
- A. Psychological counseling to address emotional well-being
- B. Medication teaching concerning adrenergic blockers
- C. Preoperative and postoperative teaching for adrenalectomy
- D. Education on dietary modifications for hypertension
Correct answer: C
Rationale: The correct answer is C: Preoperative and postoperative teaching for adrenalectomy. Pheochromocytoma often requires adrenalectomy as part of the treatment plan. Therefore, educating the client about what to expect before and after the surgery is crucial for optimal care and outcomes. Choices A, B, and D are incorrect. Choice A focuses on emotional well-being rather than the specific surgical intervention needed for pheochromocytoma. Choice B is unrelated as the primary treatment for pheochromocytoma is surgical rather than medication-based. Choice D, though related to managing hypertension, does not address the surgical aspect of treating pheochromocytoma.
3. A client is admitted to the hospital with a serum sodium level of 128 mEq/L, distended neck veins, and lung crackles. What intervention should the nurse implement?
- A. Increase the intake of salty foods
- B. Administer NaCl supplements
- C. Restrict oral fluid intake
- D. Hold the client's loop diuretic
Correct answer: C
Rationale: In the scenario described, the client presents with signs of fluid overload and hyponatremia. Restricting oral fluid intake is the appropriate intervention to manage fluid overload and correct hyponatremia. Increasing the intake of salty foods (Choice A) and administering NaCl supplements (Choice B) would exacerbate the sodium imbalance. Holding the client's loop diuretic (Choice D) is not directly related to addressing the fluid overload and hyponatremia.
4. The mother of a school-age child calls the school to ask when her daughter can return to school after treatment for Pediculosis capitis. What is the nurse’s best response?
- A. When all live lice are eliminated by the treatment
- B. Two weeks after the last treatment
- C. As soon as the itching stops
- D. After the treatment kills all the live lice
Correct answer: D
Rationale: The correct answer is 'After the treatment kills all the live lice.' The child can return to school once all live lice are eliminated to prevent the spread of Pediculosis capitis. This is essential as live lice are highly contagious. Choices A, B, and C are incorrect. Waiting for the itching to stop or for an epidemic to subside does not ensure that all live lice are eradicated, which is crucial to prevent reinfestation and transmission.
5. A male client admitted three days ago with respiratory failure is intubated and receiving 40% oxygen per facemask. Currently, his temperature is 99°F, capillary refill is less than 4 seconds, and respiratory effort is within normal limits. What outcome should the nurse evaluate to measure for successful extubation?
- A. Exhibits adequate tissue perfusion
- B. Remains free of injury
- C. Remains free of infection
- D. Maintains effective breathing pattern
Correct answer: D
Rationale: Successful extubation is primarily measured by the client's ability to maintain an effective breathing pattern. This indicates that the client can adequately oxygenate and ventilate without the need for artificial airway support. Choices A, B, and C are important aspects of patient care but are not the primary outcomes to evaluate for successful extubation. Adequate tissue perfusion, freedom from injury, and prevention of infection are ongoing goals during the client's hospitalization but are not the immediate focus when considering extubation.
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