The nurse is providing care for a client with a fluid imbalance. The nurse explains that in the body, areas with high concentration of solutes naturally and passively shift to areas of lower concentration. The nurse is describing which process?

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.

Choice A reason: This is not the best response because it does not accurately describe the client's condition. Obstruction is a possible complication of diverticulitis, but it is not indicated by fever and abdominal rigidity. Obstruction is more likely to cause symptoms such as nausea, vomiting, constipation, and abdominal distension.

Choice B reason: This is not the best response because it can worsen the client's condition. Positioning the client supine and inserting an NG tube are interventions for gastric outlet obstruction, not diverticulitis. An NG tube can increase the risk of infection and perforation in the inflamed colon. Supine position can also increase the pressure on the abdomen and cause more pain and discomfort.

Choice C reason: This is not the best response because it can be harmful to the client. Administering a fleet enema is contraindicated for diverticulitis, as it can cause more inflammation, bleeding, or perforation in the colon. A fleet enema is a type of laxative that contains sodium phosphate and is used to relieve constipation or prepare for colonoscopy.

Choice D reason: This is the best response because it is the most appropriate and urgent action for the client. Contacting the primary provider promptly and reporting these signs of perforation is essential for the client's safety and treatment. Perforation is a life-threatening complication of diverticulitis, where the colon wall ruptures and causes peritonitis, which is inflammation of the abdominal cavity. Perforation can cause symptoms such as fever, abdominal rigidity, tenderness, and rebound pain. Perforation requires immediate surgical intervention and antibiotic therapy.