Nutrition in Surgical Patients

In a malnourished surgical patient, which of the following represents the most accurate indicator of visceral protein status?

A 72-year-old woman with advanced gastric cancer undergoes total gastrectomy with Billroth II reconstruction. On postoperative day 3, she is tolerating a liquid diet. On postoperative day 7, her serum albumin is 3.1 g/dL (preoperative 4.2 g/dL), hemoglobin is 9.2 g/dL (preoperative 11.5 g/dL), and serum iron is low. She complains of fatigue. Over the next 6 weeks, she is expected to lose an additional 5–10% of her body weight despite adequate oral intake. Which nutritional complication is she at highest risk for in the long term, and what is the primary mechanism?

A 58-year-old man with a history of type 2 diabetes mellitus presents with acute pancreatitis secondary to gallstones. On day 5 of hospitalization, he remains NPO (nil per os) with nasogastric decompression. His serum albumin is 3.2 g/dL (normal 3.5–5.0), prealbumin is 15 mg/dL (normal 20–40), and total lymphocyte count is 1200/μL (normal 1500–4000). He has lost 8% of his body weight since admission. Abdominal examination shows mild tenderness but no peritonitis. What is the most appropriate route and timing of nutritional support in this patient?

Which of the following is the preferred route of nutritional support in a postoperative patient with an intact gastrointestinal tract?