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Metabolic response to postoperative parenteral nutrition in infants
Insights
Parenteral nutrition in infants with gastrointestinal defects requires careful formulation. Optimal solutions balance calories, amino acids, and electrolytes, influencing nitrogen balance and metabolic markers like insulin and fatty acids.
Area of Science:
- Pediatric Surgery
- Neonatal Nutrition
- Metabolic Research
Background:
- Infants with congenital gastrointestinal anomalies often require parenteral nutrition post-surgery.
- Optimizing parenteral solutions is crucial for growth and metabolic stability in these vulnerable patients.
Purpose of the Study:
- To evaluate the impact of different parenteral solution compositions on nitrogen balance and metabolic parameters in infants undergoing surgery for gastrointestinal defects.
- To determine optimal caloric and nitrogen ratios for parenteral nutrition in this population.
Main Methods:
- Thirty-five infants with conditions like tracheoesophageal fistula and Hirschsprung's disease were divided into six groups.
- Parenteral solutions varied in calorie content, amino acid concentration, Cal/N ratio, and inclusion of phosphate or fat emulsion.
- Key metabolic markers including nitrogen and phosphorus balance, blood urea nitrogen, glucose, insulin, and non-esterified fatty acids were monitored.
Main Results:
- Parenteral solutions with a Cal/N ratio of 200 provided adequate positive nitrogen balance.
- Phosphate-free solutions led to significant hypophosphatemia.
- Higher Cal/N ratios (400) resulted in lower blood urea nitrogen but negative nitrogen balance.
- Solutions without fat increased insulin response and decreased non-esterified fatty acids, while fat emulsion suppressed insulin and improved fatty acids.
Conclusions:
- Parenteral nutrition formulations significantly impact nitrogen retention and metabolic profiles in infants with surgical gastrointestinal anomalies.
- Careful adjustment of caloric density, amino acid content, and mineral/fat inclusion is essential for effective nutritional support.
- Further research into tailored parenteral nutrition strategies is warranted for improved outcomes in this patient group.
Abstract:
Thirty-five infants who had tracheoesophageal fistula, esophageal stenosis, anal atresia, or Hirschsprung's disease were managed with various types of parenteral solution after their radical operations. The infants were divided into 6 groups and given 1) the usual low calorie infusion consisting of 5% glucose, water, and electrolytes, 2) high calorie formula consisting of 21 g/kg/day glucose, and 4 g/kg/day synthesized crystalline L-amino acids, 3) solutions without phosphate, 4) solutions of Cal/N ratio 200 providing 4 g/kg/day amino acids, 5) solutions of Cal/N ratio 400 providing 2 g/kg/day amino acids, and 6) a regimen containing fat emulsion. Nitrogen (N) and phosphorus (P) balances, blood urea nitrogen (BUN), blood glucose, plasma phosphate, immunoreactive insulin (IRI), and non-esterified fatty acid (NEFA) values were investigated. Parenteral solutions, providing 100 Cal/kg/day of Cal/N ratio 200, yielded sufficient positive N balance (120 mg/kg/day average). High calorie solutions without phosphate caused marked hypophosphatemia (0.3 mEq/1) with undetectable P in 24-hr urine. P balance correlated with N balance. Solutions of Cal/N 400 induced a lower BUN level, although there was a cumulative negative N balance. Solutions of Cal/N 200 induced higher levels of IRI and lower glucose than those of Cal/N 400. Increased IRI response and remarkedly decreased NEFA levels were seen in the group administered solutions without fat. Solutions with fat emulsion suppressed IRI response and improved the level of plasma NEFA.