A nurse is preparing to administer medication to a preschooler and must convert the child's weight from pounds to kilograms. The child weighs 30 lb. How many kilograms does the child weigh?

(Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Choice A rationale:

The correct answer. A piston syringe is used for wound irrigation to deliver a controlled and directed flow of fluid to clean the wound. It helps remove debris and promote healing. This choice aligns with wound irrigation best practices.

Choice B rationale:

Barrier ointment is not typically used for wound irrigation. Its purpose is to protect intact skin from moisture, friction, and other irritants, rather than to clean wounds.

Choice C rationale:

Chilled irrigation solution is not commonly used for wound irrigation. Room temperature or warm sterile saline is usually recommended for wound cleansing as cold solutions can cause discomfort and vasoconstriction.

Choice D rationale:

Sterile cotton balls are not used for wound irrigation. They may leave fibers in the wound, potentially leading to infection. Wound irrigation is usually performed using sterile syringes, solutions, and appropriate irrigation devices.

The correct answer is choice C. Headache.

Choice A rationale:

Fluid overload is not a potential adverse effect of a lumbar puncture. A lumbar puncture involves the removal of cerebrospinal fluid (CSF) from the spinal canal, which wouldn't lead to fluid overload. This choice is not relevant to the procedure.

Choice B rationale:

Diarrhea is not a common adverse effect of a lumbar puncture. The procedure involves accessing the spinal canal and collecting CSF, which is not directly connected to the gastrointestinal system. Diarrhea is unrelated to the procedure.

Choice C rationale:

Headache is a potential adverse effect of a lumbar puncture. This is caused by the leakage of cerebrospinal fluid (CSF) through the puncture site, leading to a decrease in CSF pressure. This drop in pressure can cause a headache, particularly when the client sits or stands up. The headache is often described as severe and may be accompanied by neck pain and sensitivity to light. It usually resolves within a few days but can be managed with pain relief medications and plenty of fluids.

Choice D rationale:

Difficulty voiding is not a common adverse effect of a lumbar puncture. The procedure involves the lower back and spinal canal, and it doesn't directly affect the urinary system. This choice is unrelated to the procedure and its potential complications.