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. A 3-year-old boy was successfully toilet trained prior to his admission to the hospital for injuries sustained from a fall. His parents are very concerned that the child has regressed in his toileting behaviors. Which information should the nurse provide to the parents?
- A. Children usually resume their toileting behaviors when they leave the hospital
- B. A retraining program will need to be initiated when the child returns home
- C. Diapering will be provided since hospitalization is stressful to preschoolers
- D. A potty chair should be brought from home so he can maintain his toileting skills
Correct answer: A
Rationale: Children often regress in toileting behaviors during hospitalization due to stress and changes in routine. However, they usually resume normal behaviors once they are discharged and back in their familiar environment. Providing reassurance to the parents that the child is likely to return to his previous toileting habits after leaving the hospital can help alleviate their concerns. Choices B, C, and D are incorrect because they do not address the normal pattern of behavior regression and recovery in toileting skills associated with hospitalization.
3. The healthcare provider is completing a head-to-toe assessment for a client admitted for observation after falling out of a tree. Which finding warrants immediate intervention by the healthcare provider?
- A. Sluggish pupillary response to light
- B. Clear fluid leaking from the nose
- C. Complaint of severe headache
- D. Periorbital ecchymosis of the right eye
Correct answer: B
Rationale: Clear fluid leaking from the nose is concerning for cerebrospinal fluid leakage, which is a medical emergency requiring immediate intervention. Sluggish pupillary response to light may indicate neurological issues but is not as urgent as CSF leakage. Complaint of severe headache is important but not as critical as the possibility of CSF leakage. Periorbital ecchymosis of the right eye could be indicative of trauma but does not pose an immediate threat to the patient's life.
4. A 10-month-old girl is admitted with a diagnosis of possible cystic fibrosis. What question should the nurse ask the parent to assist in the diagnosis of cystic fibrosis (CF)?
- A. When you kiss her, does she taste salty?
- B. Do you notice if her urine has a musty odor?
- C. Has she been drinking cow's milk in her daily diet?
- D. How often does she have a normal bowel movement?
Correct answer: A
Rationale: The correct answer is A. Salty skin is a common sign of cystic fibrosis due to high levels of sodium in sweat. Asking about the taste of the child's skin provides valuable information related to the diagnosis of CF. Choices B, C, and D are not helpful in diagnosing cystic fibrosis. A musty odor in urine is not a typical symptom of CF. Drinking cow's milk or bowel movement frequency are not specific to CF diagnosis.
5. A client is admitted with severe dehydration. What is the most important assessment finding for the nurse to monitor?
- A. Changes in mental status
- B. Urine output and color
- C. Blood pressure and heart rate
- D. Skin turgor
Correct answer: A
Rationale: Changes in mental status are crucial to monitor in a client with severe dehydration. Altered mental status, such as confusion or lethargy, can indicate severe dehydration and potential complications like electrolyte imbalances affecting the brain. Monitoring urine output and color (choice B) is essential but may not provide immediate signs of severe dehydration. While monitoring blood pressure and heart rate (choice C) is important, changes in mental status take precedence as they can indicate more critical conditions. Skin turgor (choice D) is a valuable assessment for dehydration, but changes in mental status take priority due to their direct correlation with severe dehydration.
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