A nurse is assisting with the collection of a bone marrow specimen from a preschooler. Which of the following actions should the nurse take?

Choice A rationale:
Extremities warm to the touch. This manifestation is not indicative of decreased cardiac output. Warm extremities suggest adequate peripheral perfusion and circulation. In a child with decreased cardiac output, the body might attempt to shunt blood away from the extremities to prioritize vital organs, leading to cooler extremities.
Choice B rationale:
Capillary refill 2 seconds. A capillary refill time of 2 seconds is within the normal range for a preschool-aged child. This quick capillary refill suggests adequate circulation and is not a sign of decreased cardiac output. Prolonged capillary refill time might be indicative of poor peripheral perfusion.
Choice C rationale:
Blood pressure 112/66 mm Hg. While a blood pressure of 112/66 mm Hg might be within the normal range for a preschooler, it is not the most reliable indicator of decreased cardiac output. Blood pressure can be influenced by various factors, and a seemingly normal blood pressure does not rule out decreased cardiac output if other manifestations are present.
Choice D rationale:
Diminished pulses. This is the correct choice. Diminished or weak pulses are indicative of decreased cardiac output. Inadequate blood volume being pumped by the heart can lead to reduced peripheral perfusion, resulting in diminished pulses. This sign is important in assessing the child's cardiovascular status postoperatively, especially after a corrective procedure for tetralogy of Fallot.

Choice A rationale:
Maintaining oral rehydration therapy is a crucial nursing action when caring for a child with shigella, which is a bacterial infection that causes severe diarrhea. Oral rehydration therapy helps prevent dehydration and electrolyte imbalances caused by fluid loss from diarrhea. It involves giving the child oral rehydration solutions containing electrolytes and fluids to replace those lost through diarrhea.
Choice B rationale:
Providing a diet high in sodium is not recommended for a child with shigella. Shigella is associated with diarrhea and gastrointestinal symptoms, and a high-sodium diet can worsen fluid imbalances and dehydration.
Choice C rationale:
Shigella is a bacterial infection, not a viral infection, so administering antiviral medication would not be effective or appropriate. Antiviral medications are used to treat viral infections, not bacterial ones like shigella.
Choice D rationale:
Giving antidiarrheal agents every 4 hours is not recommended for a child with shigella. Antidiarrheal agents can slow down the gastrointestinal tract and inhibit the body's natural mechanism for expelling harmful substances, such as bacteria. It's important to allow the body to eliminate the bacteria and toxins causing the infection through diarrhea, while simultaneously providing rehydration support.