Nutritional interventions to improve recovery from postoperative ileus

The effect of early oral postoperative feeding on the recovery of intestinal motility after gastrointestinal surgery: a systematic review and meta-analysis of randomized clinical trials

Background and aims

Postoperative ileus is a frequent condition, leading to complications and a longer hospital stay. Few studies have demonstrated the benefit of early oral feeding in preventing ileus after gastrointestinal surgery. This study aims to evaluate the efficacy of early versus delayed oral feeding on the recovery of intestinal motility, length of hospital stay, and complications.

Methods

We conducted a systematic review and meta-analysis of randomized control trials, searching PubMed, Embase, Cumulative Index to Nursing and Allied Health Literature, Cochrane Central Register of Controlled Trials, and the ClincalTrials.gov until 31 December 2022. We evaluated the first passage of the stool, the first flatus, complications, length of postoperative stay, and vomiting. We assessed the risk of bias using the Cochrane risk of bias tool (version 2) for randomized trials and the quality of evidence using the Grading of Recommendations Assessment, Development, and Evaluation methodology.

Results

We included 34 studies with a median sample size of 102 participants. With a moderate certainty of the evidence, the early oral feeding may reduce the time taken for the first passage of the stool (MD -0.99 days; CI 95% -1.25, -0.72), the first flatus (MD -0.70 days; CI 95% -0.87, -0.53), and the risk of complications (RR 0.69; CI 95% 0.59-0.80), while with a low certainty of evidence, it may reduce the length of stay (MD -1.31 days; CI 95% -1.59, -1.03). However, early feeding likely does not affect the risk of vomiting (RR 0.90; CI 95% 0.68, 1.18).

Conclusion

This review suggests that early oral feeding after gastrointestinal surgery may lead to a faster intestinal recovery, shorter postoperative stays, and fewer complications. However, careful interpretation is needed due to high heterogeneity and the moderate-to-low quality of evidence. Future studies should focus on the type and starting time of early oral feeding.

The efficacy of preoperative low-residue diet on postoperative ileus following cesarean section

OBJECTIVE

To evaluate the efficacy of preoperative low-residue diet on postoperative ileus in women undergoing elective cesarean section (CS).

METHODS

This is a surgeon-blind, randomized controlled trial enrolling pregnant women at ≥39 weeks of gestation undergoing elective CS. Patients were preoperatively randomized to receive either low-residue diet (arm A) or free diet (arm B) starting from three days before surgery. The primary outcome was the postoperative ileus. The secondary outcomes were the postoperative pain (assessed through VAS scale), the quality of the surgical field (scored using a 5-point scale, from poor to excellent), postoperative complications, and the length of hospital stay. Perioperative data were collected and compared between groups.

RESULTS

A total of 166 patients were enrolled and randomized in arm A (n = 83) and arm B (n = 83). Postoperative ileus over 24 h was significantly shorter in arm A, compared to arm B (19.3% vs 36.2%). The surgical evaluation of small intestine was scored ≥3 in 96.4% of arm A patients versus 80.7% in arm B, while evaluation of large intestine, respectively, in 97.7% and 81.9%. Postoperative pain after 12 h from CS was significantly lower in arm A (VAS, 3.4 ± 1.7) compared to arm B (VAS, 4.1 ± 1.8). There were no significant differences as regards postoperative pain at 24 and 48 h, nausea/vomit, surgical complications, and hospital stay.

CONCLUSIONS

Implementation of a preoperative low-residue diet for women scheduled for elective CS would reduce postoperative ileus and pain. Further large-scale studies are required before translating these research findings into routine obstetrical practice.

ESPEN guideline on Clinical Nutrition in inflammatory bowel disease

The present guideline is an update and extension of the ESPEN scientific guideline on Clinical Nutrition in Inflammatory Bowel Disease published first in 2017. The guideline has been rearranged according to the ESPEN practical guideline on Clinical Nutrition in Inflammatory Bowel Disease published in 2020. All recommendations have been checked and, if needed, revised based on new literature, before they underwent the ESPEN consensus procedure. Moreover, a new chapter on microbiota modulation as a new option in IBD treatment has been added. The number of recommendations has been increased to 71 recommendations in the guideline update. The guideline is aimed at professionals working in clinical practice, either in hospitals or in outpatient medicine, and treating patients with IBD. General aspects of care in patients with IBD, and specific aspects during active disease and in remission are addressed. All recommendations are equipped with evidence grades, consensus rates, short commentaries and links to cited literature.

The effect of early oral postoperative feeding on the recovery of intestinal motility after gastrointestinal surgery: Protocol for a systematic review and meta-analysis

Background

Given the ever-shorter length of hospital stay after surgical procedures, nowadays it is more important than ever to study interventions that may have an impact on surgical patients’ wellbeing. According to the ERAS (Enhanced Recovery After Surgery protocols) program, early feeding must be considered one of the key components to facilitate early recovery while improving outcomes and patients’ overall experiences. To date, the international literature has reported that early postoperative feeding compared with traditional (or late) timing is safe; nevertheless, small clinical outcomes effects has been reported, also for recovery of gastrointestinal function. Therefore, the effectiveness of early postoperative feeding to reduce postoperative ileus duration remains still debated.

Objective

To analyse the effects of early versus delayed oral feeding (liquids and food) on the recovery of intestinal motility after gastrointestinal surgery.

Search methods

Pubmed, Embase, Cinahl, Cochrane Central Register of Controlled Trials (CENTRAL), and the ClincalTrials.gov register will be searched to identify the RCTs of interest.

Study inclusion

Randomized clinical trials (RCTs) comparing the effect of early postoperative versus late oral feeding on major postoperative outcomes after gastrointestinal surgery will be included.

Data collection and analysis

Two review authors will independently screen titles and abstracts to determine the initially selected studies’ inclusion. Any disagreements will be resolved through discussion and consulting a third review author. The research team members will then proceed with the methodological evaluation of the studies and their eligibility for inclusion in the systematic review.

The Role of Inflammatory Mediators in the Development of Gastrointestinal Motility Disorders

Feeding intolerance and the development of ileus is a common complication affecting critically ill, surgical, and trauma patients, resulting in prolonged intensive care unit and hospital stays, increased infectious complications, a higher rate of hospital readmission, and higher medical care costs. Medical treatment for ileus is ineffective and many of the available prokinetic drugs have serious side effects that limit their use. Despite the large number of patients affected and the consequences of ileus, little progress has been made in identifying new drug targets for the treatment of ileus. Inflammatory mediators play a critical role in the development of ileus, but surprisingly little is known about the direct effects of inflammatory mediators on cells of the gastrointestinal tract, and many of the studies are conflicting. Understanding the effects of inflammatory cytokines/chemokines on the development of ileus will facilitate the early identification of patients who will develop ileus and the identification of new drug targets to treat ileus. Thus, herein, we review the published literature concerning the effects of inflammatory mediators on gastrointestinal motility.

Enteral enriched nutrition to prevent cognitive dysfunction after surgery; a study in rats

Background

Inflammation plays an important role in postoperative cognitive dysfunction (POCD), particularly in elderly patients. Enteral enriched nutrition was shown to inhibit the response on inflammatory stimuli. Aim of the present study was to explore the therapeutic potential of enteral enriched nutrition in our rat model for POCD. The anticipated mechanism of action was examined in young rats, while responses in the target group of elderly patients were evaluated in old rats.

Methods

Male 3 and 23 months old Wistar rats received a bolus of enteral fat/protein-enriched nutrition 2 ​h and 30 ​min before surgery. The inflammatory response was evaluated by systemic inflammation markers and brain microglia activity. Additionally, in old rats, the role of the gut-brain axis was studied by microbiome analyses of faecal samples. Days 9–14 after surgery, rats were subjected to cognitive testing. Day 16, rats were sacrificed and brains were collected for immunohistochemistry.

Results

In young rats, enriched nutrition improved long-term spatial learning and memory in the Morris Water Maze, reduced plasma IL1-β and VEGF levels, but left microglia activity and neurogenesis unaffected. In contrast, in old rats, enriched nutrition improved short-term memory in the novel object- and novel location recognition tests, but impaired development of long-term memory in the Morris Water Maze. Systemic inflammation was not affected, but microglia activity seemed even increased. Gut integrity and microbiome were not affected.

Conclusion

Enteral enriched nutrition before surgery in young rats indeed reduced systemic inflammation and improved cognitive performance after surgery, whereas old rats showed a mixed favorable/unfavorable cognitive response, without effect on systemic inflammation. Anti-inflammatory effects of enriched nutrition were not reflected in decreased microglia activity. Neither was an important role for the gut-brain axis observed. Since the relatively straight forward effects of enriched nutrition in young rats could not be shown in old rats, as indicated by a mixed beneficial/detrimental cognitive outcome in the latter, caution is advised by translating effects seen in younger patients to older ones.

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Enriched nutrition reduced inflammation after surgery in young rats.

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Enriched nutrition improved postoperative cognitive outcome in young rats.

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Enteral enriched nutrition did not inhibit neuroinflammation.

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Effects in young rats do not predict effects in old rats.

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Enteral enriched nutrition caused mixed improved/declined cognition in old rats.

A pilot study on prophylactic tube enterostomy for the prevention of anastomotic leakage in patients with high-risk intestinal anastomosis

BACKGROUND

Anastomotic leakages (ALs) are one of the most serious complications following gastrointestinal anastomosis. Currently, very few operative measures are available for the prevention of ALs. This pilot study aimed to evaluate the safety and efficacy of tube enterostomy (T-E) for the prevention of ALs in patients with high-risk intestinal anastomosis.

METHODS

In this retrospective study, demographic data and postoperative outcomes were compared among patients who received T-E and two historical cohorts: one group that underwent primary anastomosis without T-E (non-T-E group) and another that underwent conventional stoma construction without anastomosis (stoma group). The operative procedures were selected according to a scoring system that quantitatively evaluated risk of Als (Zhongnan score).

RESULTS

From March 2017 to March 2020, a total of 45 consecutive patients were enrolled in the T-E group. Among these patients, 53.3% (24/45) were diagnosed with Crohn's disease (CD), and 66.7% (30/45) of them underwent emergency surgery. After propensity score matching, the demographic data were comparable among the three groups. One case of AL (2.2%) occurred in the T-E group, while four cases of ALs (8.9%, 4/45) were found in the non-T-E group (p = 0.13). Tube feeding was provided to 33.3% (15/45) of the T-E patients. Major tube-related complications included one tube dislocation (2.2%) and 3 (6.7%) minor leakages after tube withdrawal (treated conservatively). One death occurred in the stoma group. In the subgroup analysis of CD patients, lower rates of ALs and abdominal abscesses were observed in the T-E group than in the non-T-E and stoma subgroups, but the differences were not significant.

CONCLUSIONS

T-E seems to be a safe and feasible operative method for the protection of high-risk intestinal anastomosis, can be reversed and can provide enteral feeding with acceptable tube-related complications. Further studies are needed to validate the role of T-E.

A Prospective Randomized Trial Comparing Jejunostomy and Nasogastric Feeding in Minimally Invasive McKeown Esophagectomy

BACKGROUND

Early postoperative enteral nutrition is recommended for patients undergoing esophagectomy; however, the optimum method of tube feeding remains controversial. Thus, the aim of this study is to assess two common enteral nutrition methods after minimally invasive McKeown esophagectomy.

METHODS

A randomized controlled trial was performed with 120 patients who underwent minimally invasive McKeown esophagectomy from January 2017 to December 2018. The patients were randomly divided so that 58 patients were in the jejunostomy feeding (JF) group and 62 patients were in the nasogastric feeding (NF) group. The postoperative outcomes, including complications, nutritional status, quality of life, and survival rate, were studied and used as the main parameters to compare the abovementioned tube feeding methods.

RESULTS

The incidence of overall complications was equivalent between the two groups (P = 0.625), except for bowel obstruction (which occurred 4 times in the JF group but did not occur in the NF group). In the first month after surgery (postoperative month 1, POM1), a significantly higher body mass index (BMI) was observed in the JF group (23.6 ± 3.2) than in the NF group (20.9 ± 3.5, P = 0.032). The global quality-of-life scores were better in the JF group than in the NF group (P < 0.001). In addition, there were no significant differences between the two groups in terms of disease-free survival (DFS) (P = 0.816) and overall survival (OS) (P = 0.564).

CONCLUSIONS

Compared with NF, JF provides more safety, efficacy, and utility as nutritional support for minimally invasive McKeown esophagectomy patients who have a high incidence of anastomotic leakage. However, the higher risk of intestinal obstruction after JF requires attention.

Early Enteral Nutrition Could Reduce Risk of Recurrent Leakage After Definitive Resection of Anastomotic Leakage After Colorectal Cancer Surgery

BACKGROUND

The present study aimed to evaluate the effect of early enteral nutrition (EEN) after definitive resection of anastomotic leakage (DRAL) resulting from a sigmoid colon or rectal cancer radical resection.

METHODS

This was a prospective cohort study performed at our center. From January 2014 to May 2016, every patient received a standard postoperative nutritional protocol (SPNP) after DRAL and was included into SPNP group. From June 2016 to December 2018, all patients received an EEN after DRAL and were included into EEN group. The effect of postoperative EEN was evaluated.

RESULTS

There were a final total of 133 patients enrolled in our study. There were 70 patients in the SPNP group, and 63 patients in the EEN group. There were 12 cases (19.05%) with a recurrent leakage in the EEN group, and 28 cases (40%) in the SPNP group. The recurrent rate was associated with EEN (HR = 0.417, 95% CI 0.196-0.890, p = 0.024). The median defecation time in the EEN group was 5(4-7) days, while in the SPNP group was 7(6-8.25) days. The defecation was associated with EEN (HR = 1.588, 95% CI 1.080-2.336, p = 0.019), as well.

CONCLUSION

EEN could reduce the recurrent leakage rate and defecation time after definitive resection of anastomotic leakage resulting from sigmoid colon or rectal cancer radical resection.

Impact on Short-Term Complications of Early Oral Feeding in Patients with Esophageal Cancer After Esophagectomy

To evaluate early oral feeding (EOF) in short-term outcomes of patients with esophageal cancer after esophagectomy. 179 patients with esophageal cancer who underwent esophagectomy between January 2016 and February 2018 were enrolled for this study. 87 patients with EOF without nasogastric tube or nasogastric tube was removed within 24 h, were selected as the experimental group, whereas 92 patients who received nasojejunal tube feeding were set as the control group. All laboratory testing, clinical features, and hospitalization expenses were compared between the two groups. No statistical significance was observed between the two groups in hemoglobin, albumin, and prealbumin levels after esophagectomy. Notably, there was no significant difference in the incidence of severe pneumonia and anastomotic leakage between the two groups. Admittance period, postoperative defecation time, and medical expenses were significantly decreased among patients with EOF (P < 0.001). Multivariate Cox multiple-factor regression analysis revealed that there was no correlation between EOF and the risk of anastomotic leakage. EOF might not be a risk factor for increasing the incidence of severe pneumonia and anastomotic leakage in patients with esophageal cancer after esophagectomy, and it could reduce the hospitalization period as well as control medical expenses.