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7.9 Total Parenteral Nutrition (TPN)

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NCLEX-RN Registered Nurse

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1 Introduction

About the NCLEX-RN Exam Next Generation NCLEX (NGN) Clinical Judgment Measurement Model (NCJMM) How to Use This Course

2 Chapter 2: Management of Care

2.1 Legal Rights and Responsibilities 2.2 Advance Directives and Self-Determination 2.3 Informed Consent Protocols 2.4 Client Advocacy and Rights (HIPAA) 2.5 Assignment, Delegation, and Supervision 2.6 Five Rights of Delegation 2.7 Scope of Practice (RN vs LPN vs UAP) 2.8 Ethical Practice Principles

3 Chapter 3: Safety and Infection Prevention and Control

3.1 Standard Precautions and Hand Hygiene 3.2 Transmission-Based Precautions (Contact, Droplet, Airborne) 3.3 PPE Donning and Doffing Sequences 3.4 Fall Prevention and Restraints 3.5 Fire Safety (RACE/PASS) 3.6 Disaster Triage and Emergency Response

4 Chapter 4: Health Promotion and Maintenance

4.1 Growth and Development (Erikson/Piaget) 4.2 Developmental Stages: Infancy through Older Adult 4.3 Maternal and Newborn Care (Antepartum) 4.4 Intrapartum Care and Fetal Monitoring 4.5 Postpartum Care (BUBBLE-HE) 4.6 Health Screening Guidelines 4.7 Immunization Schedules

5 Chapter 5: Psychosocial Integrity

5.1 Therapeutic Communication Techniques 5.2 Non-Therapeutic Communication (What to Avoid) 5.3 Anxiety Disorders and Mental Health Concepts 5.4 Schizophrenia: Hallucinations and Delusions 5.5 Depression and Suicide Assessment 5.6 Substance Misuse and Withdrawal 5.7 Grief and End-of-Life Care

6 Chapter 6: Basic Care and Comfort

6.1 Mobility and Hazards of Immobility 6.2 Assistive Devices (Crutches, Canes, Walkers) 6.3 Nutrition and Diet Therapy 6.4 Enteral Nutrition (Tube Feeding) 6.5 Bowel Elimination and Ostomy Care 6.6 Urinary Elimination and Catheter Care

7 Chapter 7: Pharmacological and Parenteral Therapies

7.1 Medication Administration Rights 7.2 Medication Calculations 7.3 High-Alert Medications: Insulins 7.4 High-Alert Medications: Anticoagulants 7.5 High-Alert Medications: Opioids 7.6 High-Alert Medications: Digoxin and Electrolytes 7.7 IV Therapy and Complications 7.8 Blood Product Administration 7.9 Total Parenteral Nutrition (TPN)

8 Chapter 8: Reduction of Risk Potential

8.1 Laboratory Values: Hematology (CBC) 8.2 Laboratory Values: Metabolic Panel (BMP) 8.3 Laboratory Values: Coagulation Studies 8.4 Vital Signs and Trend Recognition 8.5 Perioperative Care (Pre-Op and Post-Op) 8.6 Nasogastric Tubes and Therapeutic Procedures

9 Chapter 9: Physiological Adaptation

9.1 Fluid Imbalances (Hypovolemia and Hypervolemia) 9.2 Arterial Blood Gases (ABGs) and Acid-Base Balance 9.3 Medical Emergencies: Stroke (CVA) 9.4 Medical Emergencies: Myocardial Infarction (MONA) 9.5 Diabetic Emergencies (Hypoglycemia and DKA) 9.6 Respiratory Conditions (COPD, Pneumonia) 9.7 Cardiac Conditions (Heart Failure) 9.8 Neurological Conditions (Seizures)

7.9 Total Parenteral Nutrition (TPN)

Key Takeaways Explain This Topic AI

TPN must be administered through a central line (PICC, central venous catheter) due to high osmolarity - peripheral PN has lower dextrose concentration

Monitor blood glucose every 4-6 hours while on TPN - high dextrose content causes hyperglycemia

If TPN bag runs out or must be stopped abruptly, hang D10W to prevent rebound hypoglycemia

Never add medications or piggyback other IV solutions to the TPN line

  • Change TPN tubing every 24 hours; lipid tubing every 12 hours due to bacterial growth risk
  • Last updated: January 2026

Total Parenteral Nutrition provides complete nutrition intravenously when the gastrointestinal tract cannot be used. Understanding TPN administration, monitoring, and complications is essential for safe nursing practice.

Indications for TPN

  • Condition Rationale
  • Bowel obstruction Cannot absorb nutrients enterally
  • Short bowel syndrome Insufficient intestinal length
  • Severe pancreatitis Bowel rest required
  • Prolonged ileus GI tract non-functional
  • Severe malabsorption Cannot absorb nutrients
  • High-output fistulas GI contents bypassing absorption
  • NPO > 7 days Nutrition required but enteral not possible
  • Severe burns High metabolic needs, GI dysfunction
  • TPN Components
  • Component Purpose Considerations
  • Dextrose (Glucose) Primary calorie source Causes hyperglycemia; 50-70% of calories
  • Amino Acids Protein for tissue repair Renal monitoring needed
  • Lipid Emulsion Essential fatty acids, calories Given separately or as 3-in-1
  • Electrolytes Fluid/electrolyte balance Individualized based on labs
  • Vitamins Metabolic cofactors Added daily
  • Trace Elements Zinc, copper, chromium, etc. Essential for metabolism
  • Central vs. Peripheral Parenteral Nutrition
  • Feature Central TPN Peripheral PN (PPN)
  • Dextrose concentration Up to 70% Maximum 10%
  • Osmolarity > 900 mOsm/L < 900 mOsm/L
  • Access Central line required Peripheral IV acceptable
  • Duration Long-term (weeks to months) Short-term (< 2 weeks)
  • Calories Full nutritional support Supplemental nutrition

Critical Point: High-concentration TPN causes severe phlebitis if given through a peripheral line. Central venous access is required for standard TPN.

Administration Guidelines

Access Requirements:

  • Central venous catheter (CVC)
  • PICC line
  • Implanted port

Dedicated Lumen:

  • TPN should have its own lumen
  • Do NOT use TPN line for blood draws, meds, or other infusions
  • Reduces infection risk

Infusion Rate:

  • Start at 40-50 mL/hour
  • Increase gradually over 24-48 hours
  • Goal rate achieved per order
  • Do NOT abruptly stop (rebound hypoglycemia)
  • Monitoring Parameters
  • Parameter Frequency Normal Values
  • Blood glucose Every 4-6 hours initially 70-180 mg/dL
  • Electrolytes (K+, Na+, Mg2+, PO4) Daily initially Within normal limits
  • BUN/Creatinine Daily to weekly Renal function
  • Liver function tests Weekly ALT, AST, bilirubin
  • Triglycerides Weekly if lipids given < 400 mg/dL
  • Weight Daily Steady gain appropriate
  • I&O Every shift Fluid balance
  • Complications and Nursing Interventions
  • Metabolic Complications
  • Hyperglycemia (Most Common)
  • Cause Intervention
  • High dextrose load Monitor BG every 4-6 hours
  • Stress response Administer insulin as ordered
  • Steroid use May need insulin drip
  • Hypoglycemia
  • Cause Intervention
  • Abrupt TPN discontinuation Never stop abruptly
  • Excessive insulin Taper TPN gradually
  • TPN bag runs out Hang D10W immediately
  • Refeeding Syndrome
  • Cause Signs Prevention
  • Starting TPN after starvation ↓ Potassium, phosphorus, magnesium Start TPN slowly
  • Cells rapidly take up electrolytes Cardiac arrhythmias, weakness Supplement electrolytes
  • Respiratory failure Monitor closely first 3-5 days
  • Fluid and Electrolyte Complications
  • Imbalance Signs Intervention
  • Fluid overload Edema, crackles, JVD Reduce rate, diuretics
  • Hypokalemia Weakness, arrhythmias Add potassium to TPN
  • Hypernatremia Altered mental status Adjust sodium content
  • Hypophosphatemia Weakness, respiratory failure Supplement phosphorus
  • Infection (Catheter-Related)

Signs:

  • Fever, chills
  • Redness at catheter site
  • Elevated WBC
  • Positive blood cultures

Prevention:

  • Strict aseptic technique
  • Dedicated TPN lumen
  • Change TPN bag and tubing every 24 hours
  • Change lipid tubing every 12 hours
  • Dressing changes per protocol

Intervention:

  • Obtain blood cultures
  • Notify provider
  • May need to remove catheter
  • Antibiotics as ordered
  • Critical Nursing Actions

If TPN Must Be Stopped:

  • NEVER stop abruptly (causes hypoglycemia)
  • Hang D10W at same rate to prevent rebound hypoglycemia
  • Taper gradually if planned discontinuation

Never Add to TPN:

  • No IV push medications
  • No piggyback infusions
  • No blood draws from TPN lumen
  • Incompatibilities can cause precipitation

Lipid Administration:

  • Given separately or as 3-in-1 mixture
  • Milky white appearance (don't confuse with contamination)
  • Change tubing every 12 hours (bacterial growth medium)
  • Monitor triglyceride levels
  • Cyclic TPN

Some patients receive TPN over 10-14 hours (usually overnight) instead of 24 hours:

Benefits:

  • More normal lifestyle
  • Reduces hepatic complications
  • Allows daytime mobility

Requirements:

  • Must tolerate rate increase
  • Gradual tapering at end of cycle
  • Glucose monitoring at end of cycle
  • Transitioning Off TPN

When transitioning to enteral nutrition:

  • Start tube feeding or oral diet
  • Decrease TPN as enteral intake increases
  • Taper TPN gradually over 24-48 hours
  • Monitor for hypoglycemia
  • Discontinue when enteral meets 60-75% of needs
  • On the Exam
  • Central line required for TPN (high osmolarity)
  • Monitor glucose frequently (hyperglycemia)
  • Never stop abruptly (hang D10W)
  • Dedicated line - no additives
  • Refeeding syndrome risk in malnourished patients