ATI RN
ATI Fluid Electrolyte and Acid-Base Regulation
1. . A nurse assesses a client who had an intraosseous catheter placed in the left leg. Which assessment finding is of greatest concern?
- A. The catheter has been in place for 20 hours.
 - B. . The client has poor vascular access in the upper extremities.
 - C. The catheter is placed in the proximal tibia.
 - D. The clients left lower extremity is cool to the touch.
 
Correct answer: D
Rationale:
2. What is the main force that pushes fluid in blood capillaries?
- A. Blood pressure.
 - B. Sodium in the blood plasma.
 - C. Sodium in the interstitial fluid.
 - D. Protein in the blood plasma.
 
Correct answer: A
Rationale: The correct answer is A, blood pressure. Blood pressure is the primary force that pushes fluid out of the capillaries into the surrounding tissues. This pressure difference is essential for the exchange of nutrients, gases, and waste products between the blood and tissues. Choices B, C, and D are incorrect as they do not represent the primary force responsible for pushing fluid in blood capillaries.
3. What happens first in dehydration?
- A. Intercellular fluid volume drops first.
 - B. Plasma volume drops first.
 - C. Interstitial fluid drops first.
 - D. Neither interstitial nor intracellular fluid volume are affected.
 
Correct answer: C
Rationale: In dehydration, the body first draws fluid from the interstitial space to maintain blood volume, leading to a decrease in interstitial fluid volume. This is why choice C is correct. Choice A is incorrect because intracellular fluid is not the first to be affected. Choice B is also incorrect as plasma volume reduction typically occurs after interstitial fluid loss. Choice D is incorrect as dehydration impacts both interstitial and intracellular fluid volumes.
4. The nurse is admitting a patient with a suspected fluid imbalance. The most sensitive indicator of body fluid balance is:
- A. Daily weight
 - B. Serum sodium levels
 - C. Measured intake and output
 - D. Blood pressure
 
Correct answer: A
Rationale: Daily weight is the most sensitive indicator of body fluid balance because it can show trends over time, helping in assessing the effectiveness of interventions and medications. While serum sodium levels provide objective data on electrolyte balance, they may not accurately reflect fluid balance, especially if a patient is dehydrated. Measured intake and output are crucial for assessing fluid balance, but it can be challenging to match the two due to various ways fluid is lost from the body. Blood pressure and other vital signs may not always be reliable indicators of fluid balance as they can be influenced by other factors beyond fluid status.
5. The healthcare professional working in the PACU is aware that which of the following procedures may contribute to extracellular losses?
- A. Removal of an ingrown toenail
 - B. Tooth extraction
 - C. Abdominal surgery
 - D. Cataract surgery
 
Correct answer: C
Rationale: Fluid loss from the extracellular compartment can be caused by abdominal surgery as it involves opening the abdominal cavity, potentially leading to significant fluid losses. Choices A, B, and D do not typically result in substantial extracellular losses compared to abdominal surgery.
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