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Diuretics cause chloride and potassium loss, leading to metabolic alkalosis. PN should provide chloride salts to restore balance. Acetate would worsen alkalosis, while glucose or protein adjustments do not correct acid-base disorders. Correcting chloride deficit is the most effective intervention.

Copper deficiency leads to anemia (unresponsive to iron), neutropenia, and neurologic dysfunction. It occurs in long-term PN if copper is omitted or if excess zinc supplementation interferes with absorption. Selenium deficiency causes cardiomyopathy, zinc deficiency causes dermatitis, and chromium deficiency causes insulin resistance.

NG suction removes gastric hydrochloric acid, leading to loss of hydrogen ions and subsequent metabolic alkalosis. The kidneys may retain hydrogen and excrete bicarbonate as compensation, but persistent suction often sustains alkalosis. PN adjustments should include chloride salts (NaCl, KCl) to help correct the imbalance.

Rapid growth and high cellular turnover in premature neonates drive high phosphate needs. PN that is insufficiently supplemented results in hypophosphatemia, leading to metabolic bone disease, impaired growth, and hemolysis. Adequate calcium-phosphate balance must be provided, respecting solubility limits. Hypophosphatemia is also seen in refeeding syndrome, reinforcing vigilance in neonatal PN initiation. Regular monitoring of serum phosphate ensures early detection and correction.

Because the CI crosses 1.0, the result is not statistically significant, meaning we cannot conclude PN reduces mortality compared to EN. An odds ratio <1 favors PN, but without statistical significance, the effect may be due to chance. This illustrates the importance of both point estimates and CIs in interpreting trial data. Clinicians must consider totality of evidence, study power, and clinical context when applying results.