Response to nutritional support and therapeutic approaches of amino acid and protein metabolism in surgical patients

Plasma metabolomics of early parenteral nutrition followed with enteral nutrition in pancreatic surgery patients

Nutrition support is essential for surgical patients. Patients undergoing pancreaticoduodenectomy (PD) require tremendous nutrient support but also faced with risks of infection and gastrointestinal complications. Early parenteral nutrition has recently shown benefits while limited information provided about the influence on metabolism. This prospective single-center cohort study used plasma metabolomics to clarify metabolic alteration after early parenteral nutrition followed with enteral nutrition. Patients undergoing pancreaticoduodenectomy (n = 52) were enrolled. 36 patients received parenteral nutrition within 3 days postoperatively followed with EN (TPN group), 16 patients received standard fluids followed with EN (GIK group). We found that the weight loss is reduced in TPN group while the other clinical outcomes and inflammatory cytokines showed no statistical significance. The TPN group showed significance in amino acids, lipid, and phospholipids metabolism compared with the GIK group. Moreover, integration analysis indicated that early TPN could promote the metabolism of long-chain fatty acids, phospholipids, ketone bodies, and branched-chain amino acids. We conclude that early TPN support followed with EN for patients undergoing PD reduced the perioperative weight loss and promoted the metabolic transition to anabolic metabolism with the recovery of lipid metabolism, suggesting its benefits for the recovery of patients.

Early oral feeding following esophagectomy

Nutritional support for patients with esophagectomy is very important especially for patients with malnutrition. But there is significant variation in nutritional support between different hospitals. Traditionally, 5 to 7 days of nil by mouth is required to allow healing of the anastomosis after esophagectomy; a feeding tube (usually jejunostomy tube) placed before or during the operation provides enteral access for patients with esophagectomy. However, there is no consensus of the timing of oral intake after esophagectomy. We reviewed the published data about early oral feeding (EOF) after esophagectomy. At present, there were only four studies, including two randomized studies, investigating the feasibility and safety of EOF for patients with esophagectomy. The results of the current studies show that EOF after esophagectomy do not increase postoperative complications and motility. However, evidence from large multicenter randomized controlled clinical trials is still lacking. In the future, the long-term outcomes, including body weight loss, quality of life (QOL), laboratory nutritional markers and survival, should be investigated in the field of EOF protocols. EOF after esophagectomy may require the application of the most recent knowledge and the perioperative practice of multi-disciplinary team medical care, according to the situation of each medical center.

Metabolism of albumin after continuous venovenous hemofiltration in patients with systemic inflammatory response syndrome

BACKGROUND

The systemic inflammatory response syndrome (SIRS) is characterized by a hypercatabolic state induced by inflammatory mediators. Continuous venovenous hemofiltration (CVVH) stabilizes the internal environment but also aggravates loss of amino acids. The effect of CVVH on protein dynamics is largely unknown. We adopted the stable isotopic tracer technology to investigate how CVVH changed serum albumin metabolism.

METHODS

Twenty SIRS patients were randomized into low- (2000 mL/h) and high- (4000 mL/h) volume CVVH groups according to the rate of replacement fluid. Eight patients with abdominal infection matched for age, sex, and laboratory index served as controls. Consecutive arterial blood samples were drawn during a primed-constant infusion of two stable isotopes to determine the albumin fractional synthesis rate (FSR) and fractional breakdown rate (FBR).

RESULTS

Before treatment, there was no significant difference of FSR and FBR among 3 groups. After CVVH, the albumin FSR in high- and low-volume groups was 7.75±1.08% and 7.30±0.89%, respectively, both higher than in the control (5.83±0.94%). There was no significant difference in albumin FBR after treatment.

CONCLUSIONS

Protein dynamic indicators could reflect protein synthesis and breakdown state directly and effectively. CVVH increased albumin synthesis, while the breakdown rate remained at a high level independently of the CVVH rate.

Routes for early enteral nutrition after esophagectomy. A systematic review

BACKGROUND

Early enteral feeding following surgery can be given orally, via a jejunostomy or via a nasojejunal tube. However, the best feeding route following esophagectomy is unclear.

OBJECTIVES

To determine the best route for enteral nutrition following esophagectomy regarding anastomotic leakage, pneumonia, percentage meeting the nutritional requirements, weight loss, complications of tube feeding, mortality, patient satisfaction and length of hospital stay.

DESIGN

A systematic literature review following PRISMA and MOOSE guidelines.

RESULTS

There were 17 eligible studies on early oral intake, jejunostomy or nasojejunal tube feeding. Only one nonrandomized study (N = 133) investigated early oral feeding specifically following esophagectomy. Early oral feeding was associated with a reduced length of stay with delayed oral feeding, without increased complication rates. Postoperative nasojejunal tube feeding was not significantly different from jejunostomy tube feeding regarding complications or catheter efficacy in the only randomised trial on this subject (N = 150). Jejunostomy tube feeding outcome was reported in 12 non-comparative studies (N = 3293). It was effective in meeting short-term nutritional requirements, but major tube-related complications necessitated relaparotomy in 0-2.9% of patients. In three non-comparative studies (N = 135) on nasojejunal tube feeding only minor complications were reported, data on nutritional outcome was lacking. Data on patient satisfaction and long-term nutritional outcome were not found for any of the feeding routes investigated.

CONCLUSION

It is unclear what the best route for early enteral nutrition is after esophagectomy. Especially data regarding early oral intake are scarce, and phase 2 trials are needed for further investigation.

REGISTRATION

International prospective register of systematic reviews, CRD42013004032.