A nurse is to administer a hypotonic solution to a patient with a critically high sodium. Which solution is hypotonic?

0.9% Sodium Chloride

Lactated Ringer's

D5W (5% Dextrose in Water)

0.45% Sodium Chloride

Answer and Explanation

The Correct Answer is D

Choice A reason: This is not a correct answer because 0.9% Sodium Chloride is an isotonic solution, which means it has the same osmolarity as the blood plasma. It does not cause any fluid shifts between the intracellular and extracellular compartments.

Choice B reason: This is not a correct answer because Lactated Ringer's is an isotonic solution, which means it has the same osmolarity as the blood plasma. It does not cause any fluid shifts between the intracellular and extracellular compartments.

Choice C reason: This is not a correct answer because D5W (5% Dextrose in Water) is an isotonic solution when it is in the IV bag, but it becomes hypotonic once it enters the body, as the dextrose is rapidly metabolized and only water remains. However, it is not a preferred solution for a patient with critically high sodium, as it can cause cerebral edema and worsen the neurological status.

Choice D reason: This is a correct answer because 0.45% Sodium Chloride is a hypotonic solution, which means it has a lower osmolarity than the blood plasma. It causes fluid to shift from the extracellular to the intracellular compartment, which can help lower the sodium level and correct the fluid imbalance.

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Correct Answer is A

Explanation

Choice A reason: This is a correct answer because normal saline is an isotonic solution, which means it has the same osmolarity as the blood plasma. It does not cause any fluid shifts between the intracellular and extracellular compartments, and it can help restore the fluid balance and the blood pressure of the dehydrated client.

Choice B reason: This is not a correct answer because 1/2 normal saline is a hypotonic solution, which means it has a lower osmolarity than the blood plasma. It causes fluid to shift from the extracellular to the intracellular compartment, which can lead to cellular swelling and edema. It is not suitable for rapid infusion, as it can cause hemolysis and hypotension.

Choice C reason: This is not a correct answer because D5W (5% Dextrose in Water) is an isotonic solution when it is in the IV bag, but it becomes hypotonic once it enters the body, as the dextrose is rapidly metabolized and only water remains. It causes fluid to shift from the extracellular to the intracellular compartment, which can lead to cellular swelling and edema. It is not suitable for rapid infusion, as it can cause hemolysis and hypotension.

Choice D reason: This is not a correct answer because D5 1/2 normal saline is a hypertonic solution, which means it has a higher osmolarity than the blood plasma. It causes fluid to shift from the intracellular to the extracellular compartment, which can lead to cellular shrinkage and dehydration. It is not suitable for rapid infusion, as it can cause hypernatremia and fluid overload.

A. Increased thirst and dry mucous membranes B. Low blood pressure and increased heart rate C. Difficulty breathing and weight gain D. Dry cough and poor skin turgor

Correct Answer is C

Explanation

Choice A reason: This is not a correct sign of hypervolemia. Increased thirst and dry mucous membranes are signs of dehydration or fluid volume deficit, which can occur due to excessive fluid loss or inadequate fluid intake.

Choice B reason: This is not a correct sign of hypervolemia. Low blood pressure and increased heart rate are signs of hypovolemic shock, which can occur due to severe fluid loss or hemorrhage.

Choice C reason: This is a correct sign of hypervolemia. Difficulty breathing and weight gain are signs of fluid overload, which can occur due to excessive fluid retention or impaired cardiac function. Difficulty breathing can be caused by pulmonary edema, which is the accumulation of fluid in the lungs. Weight gain can be caused by the increase in total body fluid.

Choice D reason: This is not a correct sign of hypervolemia. Dry cough and poor skin turgor are signs of dehydration or fluid volume deficit, which can occur due to excessive fluid loss or inadequate fluid intake.

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A nurse is to administer a hypotonic solution to a patient with a critically high sodium. Which solution is hypotonic?

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