A patient is getting Total Parenteral Nutrition (TPN) via central venous line. The infusion rate should monitor closely, except?

Appeared in: NORCET 3 - 2022 (Shift-2)

Explanation

the exception because Total Parenteral Nutrition (TPN) is administered into a large central vein, not an artery.
Therefore, preventing an 'artery blockage' is not a relevant concern related to the TPN infusion rate.
Complications related to vessel blockage from a central line would involve the venous system (e.g., venous thrombosis), not the arterial system.

Option A: This is a primary reason to monitor the TPN rate. TPN solutions have a high dextrose concentration (e.g., 20-25%), and rapid infusion causes hyperglycemia, while abrupt cessation causes rebound hypoglycemia.
Option B: This is a critical reason for monitoring. Rapid infusion of the TPN solution can lead to circulatory overload, causing symptoms like hypertension, pulmonary edema, and heart failure.
Option C: This is a vital reason for monitoring. TPN contains concentrated electrolytes. Rapid infusion can cause sudden, dangerous shifts in potassium, phosphate, and magnesium, which can lead to cardiac arrhythmias and other severe complications, including refeeding syndrome.

Clinical Relevance

Nursing practice connection: Use the key finding related to Complications of Total Parenteral Nutrition (TPN) and nursing responsibilities for safe administration to guide bedside assessment, documentation, and the next nursing action.
A nurse must always use an infusion pump to administer TPN to ensure a precise and constant rate. Never increase the rate to 'catch up' if the infusion falls behind schedule.
Monitor the patient's vital signs, intake and output, daily weights, and blood glucose levels (typically every 4-6 hours) to detect complications early.
Strict aseptic technique is mandatory during all TPN-related procedures (dressing changes, tubing changes) to prevent central line-associated bloodstream infections (CLABSI).

How to Approach the Question

First, identify the negative framing of the question by spotting the keyword 'except'. This means you are looking for the option that is NOT a valid reason for the action described.
Recall the fundamental principles of Total Parenteral Nutrition (TPN) therapy. Key points are: it's a hypertonic solution, it's high in glucose and electrolytes, and it's administered into a large central VEIN.
Evaluate each option against these principles.
Option A (glucose): TPN is high in glucose, so rate affects blood sugar. This is a valid reason.
Option B (fluid overload): TPN is a fluid infusion, so rate affects fluid balance. This is a valid reason.
Option C (electrolyte imbalance): TPN contains electrolytes, so rate affects their balance. This is a valid reason.

Concept Tested & Keywords

Concept Tested: Complications of Total Parenteral Nutrition (TPN) and nursing responsibilities for safe administration.
Stem keywords: Total Parenteral Nutrition (TPN), central venous line, infusion rate, monitor
Lead-in keywords: except
Negative lead-in flag: The question asks for the option that is NOT a reason to monitor the TPN infusion rate.

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E6 Medicine Harrison 22e Part 2 p. 529-531

E6 Pharmacology Nursing Lilley 11e Part 3 p. 234-236

E6 Nursing Fundamentals Potter Perry 12e Part 5 p. 207-209

Practise the full NORCET 3 - 2022 (Shift-2)

Attempt every question from this paper in a timed mock, then review the full solution for each one.