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Since the CI includes 1.0, the result is not statistically significant. Although the point estimate favors EN, the evidence does not rule out no effect. Confidence intervals must always be considered alongside RR or OR when interpreting trial results.

In severe acute pancreatitis, early enteral nutrition (within 24–48 hours) improves outcomes compared with prolonged NPO or early PN. EN helps maintain gut integrity, reduces bacterial translocation, and lowers infectious complications and mortality. If gastric feeding is tolerated, nasogastric EN is acceptable; if not, a nasojejunal route bypasses the stomach and minimizes pancreatic stimulation. PN is reserved for cases where EN is contraindicated or not feasible after attempts to establish post-pyloric feeds. Delaying nutrition for 5–7 days in a catabolic, critically ill patient increases negative nitrogen balance and complications. When initiating EN, start at low rates and advance as tolerated; monitor for abdominal pain, rising intra-abdominal pressure, and feeding intolerance. Formulas are typically standard polymeric; elemental formulas are not universally required. Tight glycemic control, adequate analgesia, and aggressive fluid/electrolyte management complement nutrition therapy to optimize recovery.

Complex carbs and soluble fiber are fermented by colonic bacteria into short-chain fatty acids, providing additional energy and improving fluid absorption. Simple sugars worsen diarrhea, high fat is poorly absorbed, and lactose intolerance is common.

Metabolic alkalosis is often driven by excess bicarbonate or loss of chloride (e.g., vomiting, diuretics). In PN, acetate salts metabolize to bicarbonate, worsening alkalosis. Replacing acetate with chloride salts (NaCl, KCl) helps restore acid-base balance. Increasing glucose has no effect on alkalosis; phosphate adjustments are unrelated. Recognizing this balance between acetate and chloride is key in tailoring PN formulations to correct metabolic derangements.

Vitamin K deficiency impairs synthesis of clotting factors II, VII, IX, and X, leading to coagulopathy and prolonged INR. It occurs in fat malabsorption syndromes (e.g., cholestasis, cystic fibrosis, pancreatic insufficiency) or inadequate supplementation in PN. Vitamin A deficiency causes vision problems, vitamin E causes neurologic deficits and hemolysis, and vitamin D causes bone disease. Adult PN should include ~150 mcg vitamin K weekly (IV or oral if EN feasible). Recognition and replacement correct coagulopathy rapidly.