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Zorluk: ZorPharmacological and Parenteral Therapies

A multidisciplinary care team prescribes continuous total parenteral nutrition (TPN) alongside a separate 20%20\% intravenous lipid emulsion for a client recovering from an extensive bowel resection. The client currently has a single-lumen peripherally inserted central catheter (PICC). The primary TPN infusion set includes a standard 0.22-micron0.22\text{-micron} in-line filter. To safely administer both solutions concurrently, which action must the nurse implement?

  1. Attach the lipid emulsion infusion set to the primary TPN line at the port situated below the 0.22-micron0.22\text{-micron} filter.Cevap
  2. B
    Connect the lipid emulsion tubing to a Y-site on the primary TPN line positioned above the 0.22-micron0.22\text{-micron} filter.
  3. C
    Manually inject the lipid emulsion into the TPN solution bag using a sterile transfer device to create a unified admixture.
  4. D
    Suspend the TPN infusion temporarily while the lipid emulsion infuses to prevent precipitate formation within the catheter.

Cevap

The lipid emulsion must be connected to the primary TPN line at a port distal to (below) the 0.22-micron filter.
Total parenteral nutrition (TPN) solutions require a 0.22-micron filter to trap bacteria and particulate matter. However, intravenous lipid emulsions consist of large fat globules that cannot pass through this microscopic mesh. To administer both solutions concurrently through a single-lumen catheter, the lipid emulsion must be connected to the primary TPN line at a Y-port located below (distal to) the 0.22-micron filter. This technique successfully bypasses the filter for the lipids while ensuring the primary TPN solution remains properly filtered.

Adım Adım Çözüm

1
Identify the physical and molecular properties of the prescribed intravenous solutions.
TPN contains dissolved small molecules (dextrose, amino acids) requiring a 0.22-micron filter to remove bacteria. Lipid emulsions contain large, emulsified fat globules.
Understanding molecular size dictates the specific filtration requirements for safe administration.
2
Determine the appropriate filtration mechanism for lipid emulsions.
Fat globules are significantly larger than 0.22 microns and cannot pass through this microscopic mesh without occluding it.
Forcing lipids through a standard micro-filter will halt the infusion, trigger pump occlusion alarms, and potentially rupture the filter membrane.
3
Select the correct anatomical point of connection on the primary IV tubing.
The lipid emulsion must bypass the 0.22-micron filter but still enter the client's single-lumen catheter concurrently with the continuous TPN.
Connecting the lipid tubing to the Y-port situated below (distal to) the 0.22-micron filter allows both solutions to mix safely just before entering the bloodstream, preserving the integrity of the filter.

Anahtar Kavram

When administering TPN and a lipid emulsion concurrently through a single-lumen central venous catheter, the lipid tubing must be connected below the 0.22-micron TPN filter to prevent complete occlusion of the filter membrane by large fat globules.
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Pharmacological and Parenteral Therapies

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