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 should the nurse conduct an Allen’s test?
- A. When obtaining pulmonary artery pressures
- B. To assess for the presence of a deep vein thrombus in the leg
- C. Just before arterial blood gases are drawn peripherally
- D. Prior to attempting a cardiac output calculation
Correct answer: C
Rationale: The correct time to conduct an Allen’s test is just before arterial blood gases are drawn peripherally. This test is performed to assess the adequacy of collateral circulation in the hand before obtaining arterial blood gases. Choice A is incorrect because an Allen’s test is not specifically done when obtaining pulmonary artery pressures. Choice B is incorrect because an Allen’s test is not used to assess deep vein thrombosis. Choice D is incorrect because an Allen’s test is not done specifically before attempting a cardiac output calculation.
3. A client with complaints of shortness of breath and abdominal pain 1 week after bariatric surgery is admitted for follow-up evaluation. Which assessment finding warrants immediate intervention by the nurse?
- A. Rectal temperature of 101°F
- B. Complaints of left shoulder pain
- C. Blood pressure of 88/50 mmHg
- D. Sustained sinus tachycardia
Correct answer: C
Rationale: A blood pressure of 88/50 mmHg indicates possible hypovolemia or shock, which requires immediate attention. Hypotension can be a sign of decreased perfusion to vital organs, potentially leading to organ failure. The other options, such as a rectal temperature of 101°F, complaints of left shoulder pain, or sustained sinus tachycardia, while important, do not present the same level of immediate threat to the client's well-being as a critically low blood pressure.
4. The healthcare provider prescribed furosemide for a 4-year-old child with a ventricular septal defect. Which outcome indicates to the nurse that this pharmacological intervention was effective?
- A. Urine specific gravity changing from 1.021 to 1.031
- B. Daily weight decrease of 2 pounds (0.9 kg)
- C. Blood urea nitrogen (BUN) increasing from 8 to 12 mg/dl (2.9 to 4.3)
- D. Urinary output decreasing by 5 ml/hour
Correct answer: B
Rationale: The correct answer is B. A daily weight decrease of 2 pounds (0.9 kg) is the most appropriate outcome to indicate the effectiveness of furosemide in a child with a ventricular septal defect. Furosemide is a diuretic medication that helps reduce fluid retention. Therefore, a decrease in weight reflects a reduction in fluid volume, which is the desired effect of furosemide. Choices A, C, and D are incorrect because changes in urine specific gravity, blood urea nitrogen (BUN) levels, and urinary output do not directly reflect the effectiveness of furosemide in this context.
5. When assessing a client's blood pressure and determining an auscultatory gap, which action should the nurse implement?
- A. Compare the palpated systolic blood pressure with the auscultated pressure
- B. Assess the client for lightheadedness upon standing
- C. Determine if an automated blood pressure reading is consistent with the manual reading
- D. Observe for changes in blood pressure between lying and sitting positions
Correct answer: A
Rationale: When an auscultatory gap is present, comparing the palpated systolic blood pressure with the auscultated pressure is crucial. This helps to accurately measure blood pressure and detect any discrepancies caused by the gap. Assessing for lightheadedness upon standing (choice B) is unrelated to addressing an auscultatory gap. Checking the consistency between automated and manual blood pressure readings (choice C) is important for validation but not specifically for managing an auscultatory gap. Observing blood pressure changes between lying and sitting positions (choice D) is relevant for orthostatic hypotension assessment but not for dealing with an auscultatory gap.
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