Meta-Analysis of Early Nutrition: The Benefits of Enteral Feeding Compared to a Nil Per Os Diet Not Only in Severe, but Also in Mild and Moderate Acute Pancreatitis

Effects of Early Versus Delayed Feeding in Patients With Acute Pancreatitis: A Systematic Review and Meta-analysis

BACKGROUND

The aim of this study was to summarize the optimal strategy for early feeding in patients with acute pancreatitis.

METHODS

The search was undertaken in electronic databases, which compared early with delayed feeding in acute pancreatitis. The primary outcome was the length of hospital stay (LOHS). The second outcomes were intolerance of refeeding, mortality, and total cost of each patient. This meta-analysis followed the "Preferred Reporting Items for Systematic Reviews and Meta-analyses" guideline. Research is registered by PROSPERO, CRD42020192133.

RESULTS

A total of 20 trials involving 2168 patients were included, randomly assigned to the early feeding group (N = 1033) and delayed feeding group (N = 1135). The LOHS was significantly lower in the early feeding group than the delayed feeding group (mean difference: -2.35, 95% CI: -2.89 to -1.80; P < 0.0001), no matter the mild or severe subgroup ( Pint = 0.69). The secondary outcome of feeding intolerance and mortality were no significant difference (risk ratio: 0.96, 0.40 to 2.16, P = 0.87 and 0.91, 0.57 to 1.46, P = 0.69; respectively). Moreover, the hospitalization cost was significantly less in the early feeding group, resulting in an average savings of 50%. In patients with severe pancreatitis, early feeding after 24 hours may be beneficial ( Pint = 0.001).

CONCLUSION

Early oral feeding can significantly reduce the LOHS and hospitalization costs in patients with acute pancreatitis without increasing feeding intolerance or mortality. In patients with severe pancreatitis, early feeding after 24 hours may be beneficial.

Parenteral Nutrition Overview

Parenteral nutrition (PN) is a life-saving intervention for patients where oral or enteral nutrition (EN) cannot be achieved or is not acceptable. The essential components of PN are carbohydrates, lipids, amino acids, vitamins, trace elements, electrolytes and water. PN should be provided via a central line because of its hypertonicity. However, peripheral PN (with lower nutrient content and larger volume) can be administered via an appropriate non-central line. There are alternatives for the compounding process also, including hospital pharmacy compounded bags and commercial multichamber bags. PN is a costly therapy and has been associated with complications. Metabolic complications related to macro and micronutrient disturbances, such as hyperglycemia, hypertriglyceridemia, and electrolyte imbalance, may occur at any time during PN therapy, as well as infectious complications, mostly related to venous access. Long-term complications, such as hepatobiliary and bone disease are associated with longer PN therapy and home-PN. To prevent and mitigate potential complications, the optimal monitoring and early management of imbalances is required. PN should be prescribed for malnourished patients or high-risk patients with malnutrition where the feasibility of full EN is in question. Several factors should be considered when providing PN, including timing of initiation, clinical status, and risk of complications.

When is enteral nutrition indicated?

Enteral nutrition (EN) is a vital component of nutrition around the world. EN allows for delivery of nutrients to those who cannot maintain adequate nutrition by oral intake alone. Common questions regarding EN are when to initiate and in what scenarios it is safe. The answers to these questions are often complex and require an evidence-based approach. The Board of Directors of the American Society for Parenteral and Enteral Nutrition (ASPEN) established an Enteral Nutrition Committtee to address the important questions surrounding the indications for EN. Consensus recommendations were established based on eight extremely clinically relevant questions regarding EN indications as deemed by the Enteral Nutrition Committee. These consensus recommendations may act as a guide for clinicians and stakeholders on difficult questions pertaining to indications for EN. This paper was approved by the ASPEN Board of Directors.

Tricetin Reduces Inflammation and Acinar Cell Injury in Cerulein-Induced Acute Pancreatitis: The Role of Oxidative Stress-Induced DNA Damage Signaling

Acute pancreatitis (AP) poses a worldwide challenge due to the growing incidence and its potentially life-threatening course and complications. Specific targeted therapies are not available, prompting the identification of new pathways and novel therapeutic approaches. Flavonoids comprise several groups of biologically active compounds with wide-ranging effects. The flavone compound, tricetin (TCT), has not yet been investigated in detail but sporadic reports indicate diverse biological activities. In the current study, we evaluated the potential protective effects of TCT in AP. TCT (30 μM) protected isolated primary murine acinar cells from the cytotoxic effects of cerulein, a cholecystokinin analog peptide. The protective effects of TCT were observed in a general viability assay (calcein ester hydrolysis), in an apoptosis assay (caspase activity), and in necrosis assays (propidium iodide uptake and lactate dehydrogenase release). The effects of TCT were not related to its potential antioxidant effects, as TCT did not protect against H₂O₂-induced acinar cell death despite possessing radical scavenging activity. Cerulein-induced expression of IL1β, IL6, and matrix metalloproteinase 2 and activation of nuclear factor-κB (NFκB) were reduced by 30 μM TCT. In vivo experiments confirmed the protective effect of TCT in a mouse model of cerulein-induced AP. TCT suppressed edema formation and apoptosis in the pancreas and reduced lipase and amylase levels in the serum. Moreover, TCT inhibited interleukin-1β (IL1β), interleukin-6 (IL6), and tumor necrosis factor-α (TNFα) expression in the pancreas and reduced the activation of the oxidative DNA damage sensor enzyme poly(ADP-ribose) polymerase-1 (PARP-1). Our data indicate that TCT can be a potential treatment option for AP.

Effects of immediate or early oral feeding on acute pancreatitis: A systematic review and meta-analysis

BACKGROUND

The timing of oral refeeding can affect length of stay (LOS) and recovery of acute pancreatitis (AP). However, the optimal timing for oral refeeding is still controversial for AP. This meta-analysis investigated the effects of immediate or early versus delayed oral feeding on mild and moderate AP, regardless of improvement in clinical signs or laboratory indicators.

METHODS

This systematic review and meta-analysis of randomized controlled trials (RCTs) based on data from Embase, Cochrane Library, PubMed, Web of science, and CBM before August 2021. Two researchers independently used Stata16 to extract and analyse study data. Random effect model was performed for meta-analysis to calculate the risk ratio (RR) and standardized mean difference (SMD).

RESULTS

8 RCTs were selected, including 748 patients with mild to moderate AP. Patients in IOR (Immediate or early Oral Refeeding) group had less costs [SMD -0.83, 95%CI (-1.17, -0.5), P < 0.001] and shorter LOS [SMD -1.01, 95%CI (-1.17, -0.85), P < 0.001] than the DOR (Delayed Oral Refeeding) group patients. However, there was no difference in mortality [RR 0.54, 95%CI (0.11, 2.62), P = 0.44], pain relapse rate [RR 0.58, 95%CI (0.25, 1.35), P = 0.27], feeding intolerance rate [RR 0.61, 95%CI (0.28, 1.3), P = 0.2], AP progression rate [RR 0.21, 95%CI (0.04, 1.07), P = 0.06] and overall complications rate [RR 0.41, 95%CI (0.17, 1.01), P = 0.05] between the IOR and DOR groups.

CONCLUSIONS

Limited data suggest that IOR could reduce LOS and costs without increasing adverse events in mild to moderate AP.

Safety and Feasibility of Early Oral Nutrition after Endoscopic Treatment for Patients with Liver Cirrhosis: A Historical-prospective, Comparative-Effectiveness Study

BACKGROUND

This study aimed to evaluate the safety and efficacy of early oral nutrition (EON) after endoscopic treatment compared with parenteral nutrition (PN) for patients with gastroesophageal variceal bleeding varices as cirrhotic complications.

METHODS

This historical-prospective study enrolled patients from Qilu Hospital of Shandong University in China with gastroesophageal varices as cirrhotic complications and undergoing endoscopic therapy. A total of 197 patients who fasted for 4 h after treatment were prospectively enrolled as the oral nutrition group whereas those who fasted for more than 48 h were retrospectively matched in a ratio of 1:1 as the parenteral nutrition group. The primary endpoint was variceal re-bleeding, whereas the secondary endpoints were mortality and adverse events during the 42-day follow-up. Hospitalisation duration and expenses, levels of inflammatory factors, defecation time, and the satisfaction of patients were evaluated.

RESULTS

During the 42-day follow-up, no significant difference was observed in the rate of variceal re-bleeding (P = 0.586) and morality (P = 1.000) between the oral nutrition group and the parenteral nutrition group. However, the average days of hospitalisation (P < 0.001) and expenses (P < 0.001) were significantly decreased in the oral nutrition group. Furthermore, C-reactive protein lever (P = 0.002) and defecation time (P < 0.001) were lower, whereas the satisfaction rate was higher (P < 0.001) in the oral nutrition group than those in the parenteral nutrition group. Linear regression analysis showed that tissue adhesive dosage was related to diet time (P = 0.038, 95% CI: 0,135-4.516).

CONCLUSIONS

EON was proven to be safe, feasible, and hence, recommended after endoscopic treatment in patients with cirrhosis. This article is protected by copyright. All rights reserved.

The Role of Phosphate in Alcohol-Induced Experimental Pancreatitis

BACKGROUND & AIMS

Heavy alcohol consumption is a common cause of acute pancreatitis; however, alcohol abuse does not always result in clinical pancreatitis. As a consequence, the factors responsible for alcohol-induced pancreatitis are not well understood. In experimental animals, it has been difficult to produce pancreatitis with alcohol. Clinically, alcohol use predisposes to hypophosphatemia, and hypophosphatemia has been observed in some patients with acute pancreatitis. Because of abundant protein synthesis, the pancreas has high metabolic demands, and reduced mitochondrial function leads to organelle dysfunction and pancreatitis. We proposed, therefore, that phosphate deficiency might limit adenosine triphosphate synthesis and thereby contribute to alcohol-induced pancreatitis.

METHODS

Mice were fed a low-phosphate diet (LPD) before orogastric administration of ethanol. Direct effects of phosphate and ethanol were evaluated in vitro in isolated mouse pancreatic acini.

RESULTS

LPD reduced serum phosphate levels. Intragastric administration of ethanol to animals maintained on an LPD caused severe pancreatitis that was ameliorated by phosphate repletion. In pancreatic acinar cells, low-phosphate conditions increased susceptibility to ethanol-induced cellular dysfunction through decreased bioenergetic stores, specifically affecting total cellular adenosine triphosphate and mitochondrial function. Phosphate supplementation prevented ethanol-associated cellular injury.

CONCLUSIONS

Phosphate status plays a critical role in predisposition to and protection from alcohol-induced acinar cell dysfunction and the development of acute alcohol-induced pancreatitis. This finding may explain why pancreatitis develops in only some individuals with heavy alcohol use and suggests a potential novel therapeutic approach to pancreatitis. Finally, an LPD plus ethanol provides a new model for studying alcohol-associated pancreatic injury.

Non-inferiority comparative clinical trial between early oral REFEEDING and usual oral REFEEDING in predicted mild acute biliary pancreatitis

BACKGROUND

The aim of the study was to compare the onset of oral feeding in the first 24 h after hospital admission with usual oral refeeding and determine whether the timing of the onset of oral feeding influences the recurrence of pain or alters the blood levels of pancreatic enzymes in patients with predicted mild acute biliary pancreatitis.

METHODS

This non-inferiority randomized controlled trial was carried out between September 2018 and June 2019 after receiving authorization from the ethics committee for health research. Patients with a diagnosis of predicted mild acute biliary pancreatitis were divided into Group A (early oral refeeding, EOR) and Group B (usual oral refeeding, UOR). Outcome measures included pancreatic lipase levels, the systemic inflammatory response (concentrations of leukocytes), feasibility (evaluated by abdominal pain recurrence), the presence and recurrence of gastrointestinal symptoms and the length of hospital stay.

RESULTS

Two patients in the EOR group experienced pain relapse (3.2%), and four patients in the UOR group experienced pain relapse (6.77%) after oral refeeding (p = 0.379). The presence of nausea or vomiting after the onset of oral refeeding was not different between the two groups (p = 0.293). The onset of oral refeeding was approximately 48 h later in the UOR group. The length of hospital stay was 5 days in the EOR group and 8 days in the UOR group (p = 0.042), and this difference was also manifested in higher hospital costs in the UOR group (p = 0.0235).

CONCLUSION

Compared with usual oral refeeding, early oral refeeding is safe in predicted mild acute biliary pancreatitis patients, does not cause adverse gastrointestinal events, and reduces the length of hospital stay and costs.

TRIAL REGISTRATION

Early oral refeeding in mild acute pancreatitis (EORVsUOR). NCT04168801 , retrospectively registered (November 19, 2019).

Risk Factors for Early Readmission After Acute Pancreatitis: Importance of Timely Interventions

BACKGROUND

Despite improvements in the diagnosis and care of acute pancreatitis, the mortality, morbidity, and long-term complications of this disease currently account for an annual cost of $10 billion in the United States. Lack of high-quality consolidated clinical data about this ever-increasing national and global burden makes it challenging to be able to recognize at-risk populations and intervene to avoid early readmission (ER) (i.e., readmission within 30 d of hospital discharge or ER).

METHODS

We reviewed the National Readmission Database for 2016. We retrieved 25,476 ER out of a total of 188,757 patients admitted with acute pancreatitis (ICD-10 diagnosis of K85), alive at discharge. Patients younger than 18 at the time of initial admission were excluded. Diagnostic characteristics and procedures performed were extracted from ICD-10 data. Based on patient demographics and the diagnostic and procedural profiles from their initial admission, we identified clusters of risk factors for ER using agglomerative hierarchical clustering. These are depicted in a correlation matrix.

RESULTS

Acute pancreatitis is associated with a 13.5% overall ER rate. Certain pre-existing chronic diseases, particularly cardiovascular disease diagnoses and interventions at initial presentation increase the odds of ER. In contrast to interventions on the pancreas, interventions on the biliary system correlated with lower odds of ER. Furthermore, the earlier the biliary system intervention was performed during the initial hospitalization, the lower the odds of ER. We identified five clusters of interrelationships: age/comorbidity cluster, cirrhosis cluster, sepsis/pulmonary complication cluster, biliary intervention cluster, and high-risk of mortality cluster.

CONCLUSIONS

We identified several potentially modifiable risk factors for ER of patients hospitalized with acute pancreatitis, which included timing of biliary interventions. Furthermore, we identified clusters of interrelationships that further illuminate which complications tend to occur concomitantly and ultimately contribute to ER. By identifying risk factors and elucidating their interactions, we have improved our understanding of this highly morbid disease and offer potential points of intervention to reduce ER.

Energy expenditure in acute pancreatitis evaluated by the Harris-Benedict equation compared with indirect calorimetry

OBJECTIVES

Enteral nutrition (EN) is recommended for severe acute pancreatitis (AP) and for biliary AP if cholecystectomy is delayed. Energy expenditure (EE) is calculated using the Harris-Benedict equation (HBE), but indirect calorimetry (IC) can also be employed. We wished to compare EE evaluated by the HBE equation, modified HBE (mHBE) and IC at study inclusion and 1 month after AP resolution.

METHODS

We undertook a single-center prospective study in Paris, France.

RESULTS

Among 35 patients, 19 had biliary AP and 11 alcoholic-related AP. Eleven cases had severe AP. There was no significant difference between EE calculated by the HBE and that using IC at study inclusion. However, the EE calculated by the mHBE was significantly higher than that calculated using IC. For severe AP, the HBE underestimated EE whereas the mHBE overestimated it. No difference was found based on the cause of AP. There was no difference between methods for EE at 30 days.

CONCLUSIONS

The HBE underestimated EE for severe AP, whereas the mHBE overestimated it. IC seems to be the best means of EE evaluation for AP.

Effects of Early Enteral Nutrition on Immune Function and Prognosis of Patients With Sepsis on Mechanical Ventilation

OBJECTIVE

To explore the therapeutic effects of early enteral nutrition (EEN) on patients with sepsis on mechanical ventilation.

METHODS

Patients with sepsis on mechanical ventilation in the medical intensive care unit (ICU) from January 2013 to March 2016 were treated with enteral nutrition. Patients treated within 48 hours of initiation of mechanical ventilation were assigned to the EEN group, and the rest were assigned to the delayed enteral nutrition (DEN) group. Peripheral blood Th17 cells and Treg cells, endotoxin (ET) level, 28-day mortality, duration of mechanical ventilation, lengths of ICU stay and hospital stay, and incidence of ICU-acquired weakness (ICU-AW) were analyzed between the 2 groups.

RESULTS

The proportion of Th17 cells and ET levels in the EEN group were significantly lower than those in the DEN group, whereas the proportion of Treg cells in the EEN group was remarkably higher than that in the DEN group (P < .05). The duration of mechanical ventilation, lengths of ICU stay and hospital stay, and incidence of ICU-AW were higher in the DEN group than in the EEN group (P < .05), but there was no significant difference in the 28-day mortality between the 2 groups.

CONCLUSION

Patients with sepsis mainly present with an increased proportion of Th17 cells in the early stage, manifesting as enhanced immune response. Early enteral nutrition can inhibit the excessive immune response, shorten the duration of mechanical ventilation, lengths of ICU stay and hospital stay, and reduce the incidence of ICU-AW, but it has no obvious effect on 28-day mortality.

Nutritional Aspects of Acute Pancreatitis

The goal of nutritional support in acute pancreatitis is to reduce inflammation, prevent nutritional depletion, correct a negative nitrogen balance, and improve outcomes. Enteral nutrition (EN) in severe acute pancreatitis (SAP) should be preferred to parenteral nutrition. It maintains the integrity of the gut barrier, decreases intestinal permeability, downregulates the systemic inflammatory response, maintains intestinal microbiota equilibrium, and reduces the complications of the early phase of SAP, improving morbidity and possibly improving mortality, and it is less expensive. Further studies to understand optimal timing of nutrition, route of delivery of EN, and the type of nutrition and nutrients are necessary.

High versus low energy administration in the early phase of acute pancreatitis (GOULASH trial): protocol of a multicentre randomised double-blind clinical trial

INTRODUCTION

Acute pancreatitis (AP) is an inflammatory disease with no specific treatment. Mitochondrial injury followed by ATP depletion in both acinar and ductal cells is a recently discovered early event in its pathogenesis. Importantly, preclinical research has shown that intracellular ATP delivery restores the physiological function of the cells and protects from cell injury, suggesting that restoration of energy levels in the pancreas is therapeutically beneficial. Despite several high quality experimental observations in this area, no randomised trials have been conducted to date to address the requirements for energy intake in the early phase of AP.

METHODS/DESIGN

This is a randomised controlled two-arm double-blind multicentre trial. Patients with AP will be randomly assigned to groups A (30 kcal/kg/day energy administration starting within 24 hours of hospital admission) or B (low energy administration during the first 72 hours of hospital admission). Energy will be delivered by nasoenteric tube feeding with additional intravenous glucose supplementation or total parenteral nutrition if necessary. A combination of multiorgan failure for more than 48 hours and mortality is defined as the primary endpoint, whereas several secondary endpoints such as length of hospitalisation or pain will be determined to elucidate more detailed differences between the groups. The general feasibility, safety and quality checks required for high quality evidence will be adhered to.

ETHICS AND DISSEMINATION

The study has been approved by the relevant organisation, the Scientific and Research Ethics Committee of the Hungarian Medical Research Council (55961-2/2016/EKU). This study will provide evidence as to whether early high energy nutritional support is beneficial in the clinical management of AP. The results of this trial will be published in an open access way and disseminated among medical doctors.

TRIAL REGISTRATION

The trial has been registered at the ISRCTN (ISRTCN 63827758).

Restoration of energy level in the early phase of acute pediatric pancreatitis

Acute pancreatitis (AP) is a serious inflammatory disease with rising incidence both in the adult and pediatric populations. It has been shown that mitochondrial injury and energy depletion are the earliest intracellular events in the early phase of AP. Moreover, it has been revealed that restoration of intracellular ATP level restores cellular functions and defends the cells from death. We have recently shown in a systematic review and meta-analysis that early enteral feeding is beneficial in adults; however, no reviews are available concerning the effect of early enteral feeding in pediatric AP. In this minireview, our aim was to systematically analyse the literature on the treatment of acute pediatric pancreatitis. The preferred reporting items for systematic review (PRISMA-P) were followed, and the question was drafted based on participants, intervention, comparison and outcomes: P: patients under the age of twenty-one suffering from acute pancreatitis; I: early enteral nutrition (per os and nasogastric- or nasojejunal tube started within 48 h); C: nil per os therapy; O: length of hospitalization, need for treatment at an intensive care unit, development of severe AP, lung injury (including lung oedema and pleural effusion), white blood cell count and pain score on admission. Altogether, 632 articles (PubMed: 131; EMBASE: 501) were found. After detailed screening of eligible papers, five of them met inclusion criteria. Only retrospective clinical trials were available. Due to insufficient information from the authors, it was only possible to address length of hospitalization as an outcome of the study. Our mini-meta-analysis showed that early enteral nutrition significantly (SD = 0.806, P = 0.034) decreases length of hospitalization compared with nil per os diet in acute pediatric pancreatitis. In this minireview, we clearly show that early enteral nutrition, started within 24-48 h, is beneficial in acute pediatric pancreatitis. Prospective studies and better presentation of research are crucially needed to achieve a higher level of evidence.