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METPN vs PPN (Parenteral Nutrition)
📌 Definition
TPN (Total Parenteral Nutrition) → Nutrition given through a central vein to meet 100% of nutritional needs.
PPN (Peripheral Parenteral Nutrition) → Nutrition given through a peripheral vein for partial nutritional support.
📊 Comparison Table
Feature
TPN
PPN
Route
Central vein (subclavian / jugular)
Peripheral vein
Nutrition Supply
Complete nutrition
Partial nutrition
Osmolarity
High (>900 mOsm/L)
Low (<900 mOsm/L)
Duration
Long-term
Short-term (≤ 2 weeks)
Calorie Content
High
Moderate
Risk
Higher infection risk
Lower infection risk
Cost
Expensive
Less expensive
Vein Irritation
No (large vein)
Possible thrombophlebitis
🩺 Indications
🔹 TPN
Bowel obstruction
Severe malnutrition
GI surgery
Pancreatitis
🔹 PPN
Mild malnutrition
Short-term NPO
Temporary support
⚠️ Complications
TPN
Catheter infection
Hyperglycemia
Electrolyte imbalance
PPN
Phlebitis
Inadequate calories
🧠 Easy Trick
TPN = Total + Central
PPN = Partial + Peripheral
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