Question

question: 45 of 45
a nurse is administering a total parenteral nutrition (tpn) solution via a central line. for which of the following reasons is a central line used instead of a peripheral line?

• blood flow is much higher in a peripheral line than in a central line.
• blood flow is much higher in a central line than in a peripheral line.
• peripheral lines use veins too small to transport any type of tpn.
• ingredients of a tpn are incompatible with the veins used for peripheral lines.

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Explanation:

To determine why a central line is used for TPN instead of a peripheral line, we analyze each option:

• Option 1 ("Blood flow is much higher in a peripheral line than in a central line") is incorrect because central lines have higher blood flow.
• Option 2 ("Blood flow is much higher in a central line than in a peripheral line") is correct. TPN solutions are hyperosmolar, and the high blood flow in central lines (e.g., in large veins like the superior vena cava) dilutes the TPN quickly, reducing the risk of vein irritation or damage.
• Option 3 ("Peripheral lines use veins too small to transport any type of TPN") is incorrect; peripheral lines can transport TPN but are limited by lower blood flow and smaller vein size, making them unsuitable for long - term or high - concentration TPN.
• Option 4 ("Ingredients of a TPN are incompatible with the veins used for peripheral lines") is incorrect; the main issue is blood flow and dilution, not ingredient - vein incompatibility.

Answer:

The correct option is the one with the text "Blood flow is much higher in a central line than in a peripheral line" (the third option from the left among the four options, or the second option in the list of four options as per the order in the image: first option: Blood flow is much higher in a peripheral line than in a central line; second option: Blood flow is much higher in a central line than in a peripheral line; third option: Peripheral lines use veins too small to transport any type of TPN; fourth option: Ingredients of a TPN are incompatible with the veins used for peripheral lines. So the correct one is the second option among the four, which has the text "Blood flow is much higher in a central line than in a peripheral line").