**Question:** Complication of total parenternal nutrition is -

A. Hyperglycemia
B. Dyslipidemia
C. Osteoporosis
D. Sepsis

**Correct Answer: D. Sepsis**

**Core Concept:** Total parenteral nutrition (TPN) is a form of artificial nutrition where nutrients are delivered directly into a patient's bloodstream through a vein (usually the central vein) to bypass the gastrointestinal tract. TPN is used when a patient is unable to take in adequate nutrition orally due to various reasons like trauma, burns, severe illness or surgery.

**Why the Correct Answer is Right:** Sepsis is a life-threatening organ dysfunction caused by a dysregulated host response to infection. In patients on TPN, the absence of gut-derived substances like short-chain fatty acids, bile acids, and vitamin K (needed for clotting) can lead to a weakened immune response. Consequently, patients on TPN are at a higher risk of developing sepsis due to the inability to mount an adequate immune response against pathogens entering the bloodstream.

**Why Each Wrong Option is Incorrect:**

A. Hyperglycemia: TPN can lead to hyperglycemia due to exogenous glucose administration. However, this is not the primary complication related to TPN, and sepsis is the primary concern.

B. Dyslipidemia: Although TPN can lead to dyslipidemia due to lipid infusion, this is secondary to the primary complication of sepsis. Sepsis is the primary concern in this context.

C. Osteoporosis: TPN can lead to osteoporosis due to lack of oral intake and reduced physical activity. However, this is a consequence of the primary complication (sepsis) and not the primary concern.

**Clinical Pearl:** While TPN can be lifesaving in certain situations, it is essential to monitor patients closely for sepsis and its complications. Inadequate immune response due to lack of gut-derived substances can lead to sepsis, which in turn can cause severe complications like multiorgan dysfunction and death. Early recognition and intervention are crucial to prevent these severe outcomes.