Prospective, randomized trial on the effect of cyclic versus continuous enteral nutrition on postoperative gastric function after pylorus-preserving pancreatoduodenectomy

Postoperative nutritional support after pancreaticoduodenectomy in adults

BACKGROUND

Resection of the head of the pancreas is most commonly done by a pancreaticoduodenectomy, known as a Whipple procedure. The most common indication for pancreaticoduodenectomy is malignancy, but can include benign tumours and chronic pancreatitis. Complete surgical resection, with negative margins, provides the best prospect of long-term survival. Pancreaticoduodenectomy involves specific and unique alterations to the digestive system and maintaining nutritional status (optimising outcomes and achieving resumption of a normal diet) in patients with cancer after major surgery is a challenge. Malnutrition is a risk factor following pancreaticoduodenectomy, due to the magnitude of the operation and the frequency of complications. Postoperatively, patients are fed either orally, enterally or parenterally. Oral intake may start with fluids and then progress to solid food, or may be ad libitum. Enteral feeding may be via a nasojejunal tube or feeding tube jejunostomy. Parenteral nutrition can be delivered via a central or peripheral intravenous line, and may provide full nutrition (TPN) or partial nutrition (supplemental PN).

OBJECTIVES

To assess the effects of postoperative nutritional support strategies on complications and recovery in adults after pancreaticoduodenectomy.

SEARCH METHODS

We searched CENTRAL, MEDLINE, Embase, LILACS and CINAHL (from inception to October 2022), ongoing trials registers and other internet databases. We searched previous systematic reviews, relevant publications on the same topic and the references of included studies.

SELECTION CRITERIA

Randomised controlled trials of postoperative nutritional interventions in an inpatient setting for patients undergoing pancreaticoduodenectomy. We specifically looked for studies comparing route or timing rather than nutritional content.

DATA COLLECTION AND ANALYSIS

Two review authors independently assessed studies for inclusion, judged the risk of bias and extracted data. Studies requiring translation were assessed for inclusion, risk of bias and data extraction by an external translator and another author. We used GRADE to evaluate the certainty of the evidence.

MAIN RESULTS

We included 17 studies (1897 participants). Of these, eight studies could be included in a meta-analysis. The route, timing and target of nutritional support varied widely between studies. Enteral feeding (jejunostomy, nasojejunal or gastrojejunostomy) was used in at least 13 studies (one study did not specify the method of enteral route), parenteral nutrition (PN) was used in at least 10 studies (two studies had a control of 'surgeon's preference' and no further details were given) and oral intake was used in seven studies. Overall, the evidence presented in this review is of low to very low certainty. Four studies compared jejunostomy feeding with total parenteral nutrition. When we pooled these four studies, the evidence demonstrated that jejunostomy likely results in a reduced length of hospital stay (mean difference (MD) -1.61 days, 95% confidence interval (CI) -2.31 to -0.92; 3 studies, 316 participants; moderate-certainty evidence). The evidence suggested that there may be no difference in postoperative pancreatic fistula (risk ratio (RR) 0.77, 95% CI 0.41 to 1.47; 4 studies, 346 participants; low-certainty evidence) and that there may be no difference in delayed gastric emptying (RR 0.38, 95% CI 0.04 to 3.50; 2 studies, 270 participants; very low-certainty evidence) or post pancreatectomy haemorrhage (RR 0.36, 95% CI 0.06 to 2.29; 2 studies, 270 participants; very low-certainty evidence), but the evidence is uncertain. There were no data for major and minor complications defined by the Clavien-Dindo classification. Two studies compared nasojejunal feeding with total parenteral nutrition. When the two studies were pooled, the evidence suggested that there may be little to no difference between nasojejunal feeding and TPN in the length of hospital stay (MD 1.07 days, 95% CI -2.64 to 4.79; 2 studies, 242 participants; low-certainty evidence), delayed gastric emptying (RR 1.26, 95% CI 0.83 to 1.91; 2 studies, 242 participants; low-certainty evidence) or post pancreatectomy haemorrhage (RR 1.00, 95% CI 0.62 to 1.62; 2 studies, 242 participants; low-certainty evidence). TPN may slightly improve rates of clinically relevant postoperative pancreatic fistula (RR 2.13, 95% CI 1.21 to 3.74; 2 studies, 242 participants; low-certainty evidence). One study reported on major complications (RR 1.27, 95% CI 0.83 to 1.94; very low-certainty evidence) and minor complications (RR 1.01, 95% CI 0.68 to 1.50; 204 participants; very low-certainty evidence) defined by the Clavien-Dindo classification and there may be little to no difference in effect, but the evidence is uncertain. Two studies compared jejunostomy feeding with oral intake. Of note, one of the studies used a modified surgical technique as part of the intervention. We pooled these studies and found that there may be little to no difference in the length of hospital stay (MD -1.99 days, 95% CI -4.90 to 0.91; 2 studies, 301 participants; very low-certainty evidence) or delayed gastric emptying (RR 0.98, 95% CI 0.33 to 2.88; 2 studies, 307 participants; very low-certainty evidence). One study reported on major complications (RR 1.01, 95% CI 0.44 to 2.34; 247 participants; very low-certainty evidence) and minor complications (RR 0.83, 95% CI 0.59 to 1.15; 247 participants; very low-certainty evidence) defined by the Clavien-Dindo classification, postoperative pancreatic fistula (RR 0.86, 95% CI 0.30 to 2.50; 247 participants; very low-certainty evidence) and post pancreatectomy haemorrhage (RR 2.02, 95% CI 0.52 to 7.88; 247 participants; very low-certainty evidence) and there may be little to no difference in effect on these outcomes, but the evidence is uncertain. No difference in mortality was detected in any of the analyses (Clavien-Dindo Grade V) (very low-certainty evidence).

AUTHORS' CONCLUSIONS

When compared with parenteral nutrition, enteral nutrition by jejunostomy likely results in a decreased length of hospital stay and may lead to no difference in the incidence of postoperative complications. When compared with parenteral nutrition, enteral feeding by nasojejunal tube may result in no difference in the incidence of postoperative complications or length of hospital stay. When compared with oral nutrition, enteral nutrition by jejunostomy feeding may result in no difference in the incidence of postoperative complications or length of hospital stay, but the evidence is very uncertain. Further high-quality research is required and there are several ongoing studies. Given the number of different nutritional interventions available in the postoperative setting, a network meta-analysis would be more appropriate in future.

Functional sequelae after pancreatic resection for cancer

The morbidity and mortality of pancreatic cancer surgery has seen substantial improvement due to the standardization of surgical techniques, the optimization of perioperative multidisciplinary management and the organization of specialized care systems. The identification and treatment of postoperative functional and nutritional sequelae have thereby become major issues in patients who undergo pancreatic surgery. This review addresses the functional sequelae of pancreatic resection for cancerous and pre-cancerous lesions (excluding chronic pancreatitis). Its aim is to specify the prevalence and severity of sequelae according to the type of pancreatic resection and to document, where appropriate, the therapeutic management. Exocrine pancreatic insufficiency (ExPI) is observed in nearly one out of three patients at one year after surgery, and endocrine pancreatic insufficiency (EnPI) is present in one out of five patients after pancreatoduodenectomy (PD) and one out of three patients after distal pancreatectomy (DP). In addition, digestive functional disorders may appear, such as delayed gastric emptying (DGE), which affects 10 to 45% of patients after PD and nearly 8% after DP. Beyond these functional sequelae, pancreatic surgery can also induce nutritional and vitamin deficiencies secondary to a lack of uptake for certain vitamins or to the loss of absorption site in the duodenum. In addition to the treatment of ExPI with oral pancreatic enzymes, nutritional management is based on a high-calorie, high-protein diet with normal lipid intake in frequent small feedings, combined with vitamin supplementation adapted to monitored deficiencies. Better knowledge of the functional consequences of pancreatic cancer surgery can improve the overall management of patients.

Recent Advances in Pancreatic Ductal Adenocarcinoma: Strategies to Optimise the Perioperative Nutritional Status in Pancreatoduodenectomy Patients

Pancreatic ductal adenocarcinoma (PDAC) is an aggressive malignancy for which the mainstay of treatment is surgical resection, followed by adjuvant chemotherapy. Patients with PDAC are disproportionately affected by malnutrition, which increases the rate of perioperative morbidity and mortality, as well as reducing the chance of completing adjuvant chemotherapy. This review presents the current evidence for pre-, intra-, and post-operative strategies to improve the nutritional status of PDAC patients. Such preoperative strategies include accurate assessment of nutritional status, diagnosis and appropriate treatment of pancreatic exocrine insufficiency, and prehabilitation. Postoperative interventions include accurate monitoring of nutritional intake and proactive use of supplementary feeding methods, as required. There is early evidence to suggest that perioperative supplementation with immunonutrition and probiotics may be beneficial, but further study and understanding of the underlying mechanism of action are required.

[Chronobiological interventions for prevention and treatment of delirium in critically ill patients]

Circadian body and behavior rhythms serve to coordinate and maintain the physiological processes in the human body. A disruption of these rhythms frequently occurs in intensive care patients and can be the cause for the development of delirium. This review article discusses the underlying pathophysiological mechanisms and develops a chronobiologically oriented prevention and treatment approach for delirium in the context of intensive care medicine.

Early Nasojejunal Nutrition Versus Early Oral Feeding in Patients After Pancreaticoduodenectomy: A Randomized Controlled Trial

Objective

The aim of this study was to test the hypothesis that early oral feeding (EOF) is superior to early nasojejunal nutrition (ENN) after pylorus-preserving pancreaticoduodenectomy (PPPD) in terms of delayed gastric emptying (DGE).

Background

DGE is a common complication after PPPD. Although EOF after PPPD is recommended by several international guidelines, there is no randomized trial to support this recommendation.

Methods

From September 2016 to December 2017, a total of 120 patients undergoing PPPD were randomized into the ENN, EOF, or saline groups at a 1:1:1 ratio (40 patients in each group). The primary endpoint was the rate of clinically relevant DGE. Secondary endpoints included overall morbidity, postoperative pancreatic fistula, post-pancreatectomy hemorrhage, abdominal infection, length of hospital stay, reoperation rate, and in-hospital mortality.

Results

The baseline characteristics and operative parameters were comparable between the groups. The incidence of clinically relevant DGE varied significantly among the three groups (ENN, 17.5%; EOF, 10.0%; saline, 32.5%; p =0.038). The saline group had a higher clinically relevant DGE rate than the EOF group (p = 0.014). The saline group also had greater overall morbidities than the ENN and EOF groups (p = 0.041 and p = 0.006, respectively). There were no significant differences in other surgical complication rates or postoperative hospital stay. No mortality was observed in any of the groups.

Conclusions

Nutritional support methods were not related to DGE after PPPD. EOF was feasible and safe after PPPD, and additional ENN should not be routinely administered to patients after PPPD.

Clinical Trial Registration

ClinicalTrials.gov, identifier NCT03150615.

Impact of Intravenous Fluids and Enteral Nutrition on the Severity of Gastrointestinal Dysfunction: A Systematic Review and Meta-analysis

Introduction

Gastrointestinal dysfunction (GDF) is one of the primary causes of morbidity and mortality in critically ill patients. Intensive care interventions, such as intravenous fluids and enteral feeding, can exacerbate GDF. There exists a paucity of high-quality literature on the interaction between these two modalities (intravenous fluids and enteral feeding) as a combined therapy on its impact on GDF.

Aim

To review the impact of intravenous fluids and enteral nutrition individually on determinants of gut function and implications in clinical practice.

Methods

Randomized controlled trials on intravenous fluids and enteral feeding on GDF were identified by a comprehensive database search of MEDLINE and EMBASE. Extraction of data was conducted for study characteristics, provision of fluids or feeding in both groups and quality of studies was assessed using the Cochrane criteria. A random-effects model was applied to estimate the impact of these interventions across the spectrum of GDF severity.

Results

Restricted/ goal-directed intravenous fluid therapy is likely to reduce ‘mild’ GDF such as vomiting (p = 0.03) compared to a standard/ liberal intravenous fluid regime. Enterally fed patients experienced increased episodes of vomiting (p = <0.01) but were less likely to develop an anastomotic leak (p = 0.03) and peritonitis (p = 0.03) compared to parenterally fed patients. Vomiting (p = <0.01) and anastomotic leak (p = 0.04) were significantly lower in the early enteral feeding group.

Conclusions

There is less emphasis on the combined approach of intravenous fluid resuscitation and enteral feeding in critically ill patients. Conservative fluid resuscitation and aggressive enteral feeding are presumably key factors contributing to severe life-threatening GDF. Future trials should evaluate the impact of cross-interaction between conservative and aggressive modes of these two interventions on the severity of GDF.

Experience with a simplified feeding jejunostomy technique for enteral nutrition following major visceral operations

Background

Background: Perioperative nutrition support has been shown to impact on outcomes for patients with gastrointestinal cancer. Postoperative benefits of feeding tubes must be weighed against morbidity related to placement and use. A simplified jejunostomy tube technique was evaluated for outcomes.

Methods

A 16-Fr rubber tube is secured at the jejunal entry site without Witzel tunnel, followed by a continuous, circumferential and alternating suture between jejunal wall and parietal peritoneum. Prospectively collected data were analyzed.

Results

The technique was performed in 343 of 803 major hepatopancreatobiliary and upper gastrointestinal (GI) resections (43%). Of these patients (male =57%, median age: 65.8 years, range, 24.0-98.0 years), 89% had a cancer diagnosis. The procedures included pancreatectomy (n=189, 55%), gastrectomy (n=109, 32%), esophagectomy (n=19, 6%) and others (n=26, 7%). The operative intent was curative in 78%, palliative in 10%, or combined in 12% of patients. Postoperative morbidity rate was 40%, with 19 lethal events (5.5%), and a median length of stay of 10 days (range, 4-111 days). Tube feeds were administered in 139 patients (41%), and in 17% continued beyond discharge. Use of the feeding tube was linked to treatment interval, length of stay, major complication grade (all at P<0.0001), metastatic stage (P=0.0007) and noncurative intent (P=0.001). Tube feeds beyond discharge were associated with time interval (P<0.0001), length of stay (P=0.0006) and noncurative intent (P=0.014). Tube-specific events in 38 patients (11%) were all minor, without any intraabdominal leak, infection or obstruction.

Conclusions

The technique described is safe and expedient, and the overall tube-related morbidity is low. This procedure can be recommended in cases at risk for major morbidity and nutrition support needs.

Methods of Enteral Nutrition Administration in Critically Ill Patients: Continuous, Cyclic, Intermittent, and Bolus Feeding

There are several methods of enteral nutrition (EN) administration, including continuous, cyclic, intermittent, and bolus techniques, which can be used either alone or in combination. Continuous feeding involves hourly administration of EN over 24 hours assisted by a feeding pump; cyclic feeding involves administration of EN over a time period of <24 hours generally assisted by a feeding pump; intermittent feeding involves administration of EN over 20-60 minutes every 4-6 hours via pump assist or gravity assist; and bolus feeding involves administration of EN over a 4- to 10-minute period using a syringe or gravity drip. In practice, pump-assisted continuous feeding is generally acceptable for critically ill patients to prevent EN-related complications. However, a limited number of studies have been conducted to support this practice. In addition, regarding muscle protein synthesis and gastrointestinal hormone secretion, intermittent or bolus feeding may be more beneficial than continuous EN feeding for critically ill patients. For medically stable patients with feeding tubes terminating in the stomach, bolus feeding is favored with respect to practical factors, such as cost, convenience, and patient mobility. However, few studies have shown whether intermittent or bolus feeding is beneficial in a critical care setting at present. Additional randomized controlled studies comparing intermittent with bolus feeding are required.

Does the Ileal Brake Contribute to Delayed Gastric Emptying After Pancreatoduodenectomy?

Delayed gastric emptying (DGE) represents a significant cause for morbidity following pancreatoduodenectomy (PD). At a time when no specific and universally effective therapy exists to treat these patients, elucidating other potential (preventable or treatable) mechanisms for DGE is important. The aim of the manuscript was to test the hypothesis that ileal brake contributes to DGE in PD patients receiving jejunal tube feeding by systematically reviewing experimental and clinical literature. A series of clinically relevant questions were framed related to the potential role of the ileal brake in development of DGE post-PD and formed the basis of targeted literature searches. A comprehensive search of major reference databases from January 1980 to June 2015 was carried out which included human and animal studies. The ileal brake is a feedback loop neurally mediated by the vagus and sympatho-adrenergic pathways and hormonally by gut peptides including glucagon-like peptide-1, peptide YY (PYY), and neurotensin. The most potent stimulus for this inhibitory reflex is intra-ileal fat. There is evidence to indicate the role of an inhibitory reflex (on gastric emptying) mediated by PYY and CCK which, in turn, are stimulated by nutrient delivery into the distal small intestine providing indirect support to the role of ileal brake in post-PD DGE. The ileal brake is a likely factor contributing to DGE post-PD. While there has been no study to directly test this hypothesis, there is compelling indirect evidence to support it. Designing a trial that would answer such a question appears to be the most appropriate way forward.

Early enteral nutrition vs parenteral nutrition following pancreaticoduodenectomy: Experience from a single center

AIM

To analyze and compare postoperative morbidity between patients receiving total parenteral nutrition (TPN) and early enteral nutrition supplemented with parenteral nutrition (EEN + PN).

METHODS

Three hundred and forty patients receiving pancreaticoduodenectomy (PD) from 2009 to 2013 at our center were enrolled retrospectively. Patients were divided into two groups depending on postoperative nutrition support scheme: an EEN + PN group (n = 87) and a TPN group (n = 253). Demographic characteristics, comorbidities, preoperative biochemical parameters, pathological diagnosis, intraoperative information, and postoperative complications of the two groups were analyzed.

RESULTS

The two groups did not differ in demographic characteristics, preoperative comorbidities, preoperative biochemical parameters or pathological findings (P > 0.05 for all). However, patients with EEN + PN following PD had a higher incidence of delayed gastric emptying (16.1% vs 6.7%, P = 0.016), pulmonary infection (10.3% vs 3.6%, P = 0.024), and probably intraperitoneal infection (18.4% vs 10.3%, P = 0.059), which might account for their longer nasogastric tube retention time (9 d vs 5 d, P = 0.006), postoperative hospital stay (25 d vs 20 d, P = 0.055) and higher hospitalization expenses (USD10397 vs USD8663.9, P = 0.008), compared to those with TPN.

CONCLUSION

Our study suggests that TPN might be safe and sufficient for patient recovery after PD. Postoperative EEN should only be performed scrupulously and selectively.

Pancreatic Fistula and Delayed Gastric Emptying After Pancreatectomy: Where do We Stand?

Pancreatic resection has become a feasible treatment of pancreatic neoplasms, and with improvements in surgical techniques and perioperative management, mortality associated with pancreatic surgery has decreased considerably. Despite this improvement, a high rate of complications is still associated with these procedures. Among these complications, delayed gastric emptying (DGE) and postoperative pancreatic fistula (POPF) have a substantial impact on patient outcomes and burden our healthcare system. Technical modifications and postoperative approaches have been proposed to reduce rates of both POPF and DGE in patients undergoing pancreatectomy; however, to date, their rates have remained unchanged. In the present study, we summarize the findings of the most significant studies that have investigated these complications. In particular, several studies focused on technical modifications including extent of dissection, stent placement, nature of anastomosis, type of reconstruction, and application of biological or non-biological agents to site of anastomosis. Moreover, postoperatively, drain placement, duration of drain usage, postoperative feeding, and use of pharmacological agents were studied to reduce rates of POPF and DGE. In this review, we summarize the most relevant literature on this fundamental aspect of pancreatic surgery. Despite studies identifying the potential benefit of technical modifications and postoperative approaches, these findings remain controversial and suggest need for further extensive investigation. Most importantly, we recommend that all surgeons performing these procedures base their practice on the most updated and highest available level of evidence.

Feeding patients with preoperative symptoms of gastric outlet obstruction after pancreatoduodenectomy: Early oral or routine nasojejunal tube feeding?

BACKGROUND

Early oral feeding is currently considered the optimal routine feeding strategy after pancreatoduodenectomy (PD). Some have suggested that patients with preoperative symptoms of gastric outlet obstruction (GOO) who undergo PD have such a high risk of developing delayed gastric emptying that these patients should rather receive routine postoperative tube feeding. The aim of this study was to determine whether clinical outcomes after PD in these patients differ between postoperative early oral feeding and routine tube feeding.

METHODS

We analyzed a consecutive multicenter cohort of patients with preoperative symptoms of GOO undergoing PD (2010-2013). Patients were categorized into two groups based on the applied postoperative feeding strategy (dependent on their center's routine strategy): early oral feeding or routine nasojejunal tube feeding.

RESULTS

Of 497 patients undergoing PD, 83 (17%) suffered from preoperative symptoms of GOO. 49 patients received early oral feeding and 29 patients received routine tube feeding. Time to resumption of adequate oral intake (primary outcome; 14 vs. 12 days, p = 0.61) did not differ between these two feeding strategies. Furthermore, overall complications and length of stay were similar in both groups. Of the patients receiving early oral feeding, 24 (49%) ultimately required postoperative tube feeding. In patients with an uncomplicated postoperative course, early oral feeding was associated with shorter time to adequate oral intake (8 vs. 12 days, p = 0.008) and shorter hospital stay (9 vs. 13 days, p < 0.001).

CONCLUSION

Also in patients with preoperative symptoms of GOO, early oral feeding can be considered the routine feeding strategy after PD.

Enteral nutrition in pancreaticoduodenectomy: a literature review

Pancreaticoduodenectomy (PD) is considered the gold standard treatment for periampullory carcinomas. This procedure presents 30%–40% of morbidity. Patients who have undergone pancreaticoduodenectomy often present perioperative malnutrition that is worse in the early postoperative days, affects the process of healing, the intestinal barrier function and the number of postoperative complications. Few studies focus on the relation between enteral nutrition (EN) and postoperative complications. Our aim was to perform a review, including only randomized controlled trial meta-analyses or well-designed studies, of evidence regarding the correlation between EN and main complications and outcomes after pancreaticoduodenectomy, as delayed gastric emptying (DGE), postoperative pancreatic fistula (POPF), postpancreatectomy hemorrhage (PPH), length of stay and infectious complications. Several studies, especially randomized controlled trial have shown that EN does not increase the rate of DGE. EN appeared safe and tolerated for patients after PD, even if it did not reveal any advantages in terms of POPF, PPH, length of stay and infectious complications.

Optimal management of delayed gastric emptying after pancreatectomy: an analysis of 1,089 patients

PURPOSE

The aim of this study was to determine if early recognition and treatment of delayed gastric emptying (DGE) can augment postoperative outcomes in patients undergoing pancreatectomy.

METHODS

The International Study Group of Pancreatic Surgery definition of DGE was used to identify patients at Indiana University Hospital who required supplemental nutrition for DGE after pancreatectomy. Outcomes were compared between those without DGE, those with DGE who received supplemental nutrition within 10 days after pancreatectomy (early intervention), and those treated after 10 days (late intervention).

RESULTS

Between 2007 and 2012, the incidence of DGE was 15% (n = 163/1,089), 45% (n = 73) required supplemental nutrition, including 60% (n = 44/73) in the early intervention and 40% (n = 29/73) in the late intervention groups. Postoperative morbidity (62% vs 41%; P < .01), duration of stay (16 vs 7 days; P < .01), and readmissions (41% vs 17%; P < .01) were greater among those with DGE. The early intervention group resumed a regular diet sooner (day 24 vs 36; P = .05) and were readmitted less often (25% vs 65%; P < .01) than those in the late intervention group. Treatment-related complications occurred in 14% of patients.

CONCLUSION

Patients with DGE can be managed with acceptable treatment-related morbidity. Outcomes are best when supplemental nutrition is started within 10 days of operation.

Pancreatic surgery: indications, complications, and implications for nutrition intervention

Pancreatic surgery is a complicated procedure leaving postoperative patients with an altered gastrointestinal (GI) anatomy and a potential for further surgical complications such as leaks and fistulas. Beyond surgical complications, these patients are prone to delayed gastric emptying, fat malabsorption, and hyperglycemia, with early satiety and poor appetite further compromising nutrition status. Many of these patients are malnourished prior to this major surgical procedure, and significant weight loss is common postoperatively. Does this affect their outcome? There seems to be a lack of consensus in this patient population regarding how to optimize nutrition and limit potential deleterious effects of this surgery. It is important to first understand the underlying disease condition and the effects to the gland, different forms of surgery with subsequent GI alterations, and common surgical and digestive complications. Once this is reviewed, existing nutrition support literature will be explored in attempts to determine the best nutrition management in this patient population.

Systematic review of five feeding routes after pancreatoduodenectomy

BACKGROUND

Current European guidelines recommend routine enteral feeding after pancreato-duodenectomy (PD), whereas American guidelines do not. The aim of this study was to determine the optimal feeding route after PD.

METHODS

A systematic search was performed in PubMed, Embase and the Cochrane Library. Included were studies on feeding routes after PD that reported length of hospital stay (primary outcome).

RESULTS

Of 442 articles screened, 15 studies with 3474 patients were included. Data on five feeding routes were extracted: oral diet (2210 patients), enteral nutrition via either a nasojejunal tube (NJT, 165), gastrojejunostomy tube (GJT, 52) or jejunostomy tube (JT, 623), and total parenteral nutrition (TPN, 424). Mean(s.d.) length of hospital stay was shortest in the oral diet and GJT groups (15(14) and 15(11) days respectively), followed by 19(12) days in the JT, 20(15) days in the TPN and 25(11) days in the NJT group. Normal oral intake was established most quickly in the oral diet group (mean 6(5) days), followed by 8(9) days in the NJT group. The incidence of delayed gastric emptying varied from 6 per cent (3 of 52 patients) in the GJT group to 23.2 per cent (43 of 185) in the JT group, but definitions varied widely. The overall morbidity rate ranged from 43.8 per cent (81 of 185) in the JT group to 75 per cent (24 of 32) in the GJT group. The overall mortality rate ranged from 1.8 per cent (3 of 165) in the NJT group to 5.4 per cent (23 of 424) in the TPN group.

CONCLUSION

There is no evidence to support routine enteral or parenteral feeding after PD. An oral diet may be considered as the preferred routine feeding strategy after PD.

Nutritional status and nutritional support before and after pancreatectomy for pancreatic cancer and chronic pancreatitis

Cachexia, malnutrition, significant weight loss, and reduction in food intake due to anorexia represent the most important pathophysiological consequences of pancreatic cancer. Pathophysiological consequences result also from pancreatectomy, the type and severity of which differ significantly and depend on the type of the operation performed. Nutritional intervention, either parenteral or enteral, needs to be seen as a method of support in pancreatic cancer patients aiming at the maintenance of the nutritional and functional status and the prevention or attenuation of cachexia. Oral nutrition could reduce complications while restoring quality of life. Enteral nutrition in the post-operative period could also reduce infective complications. The evidence for immune-enhanced feed in patients undergoing pancreaticoduodenectomy for pancreatic cancer is supported by the available clinical data. Nutritional support during the post-operative period on a cyclical basis is preferred because it is associated with low incidence of gastric stasis. Postoperative total parenteral nutrition is indicated only to those patients who are unable to be fed orally or enterally. Thus nutritional deficiency is a relatively widesoread and constant finding suggesting that we must optimise the nutritional status both before and after surgery.

Current surgical management of pancreatic cancer

En bloc resection is the treatment of choice for localized pancreatic cancer. While the perioperative mortality associated with resection is low, it still carries a significant morbidity rate of up to 50% in certain high-risk subsets of patients. With advances in perioperative care, radical resection with inclusion of adjacent vascular structure to achieve negative margin status can be performed with comparable mortality and morbidity in high-volume centers. Early results with the use of minimally invasive technique in pancreatic surgery are promising. Recent data on perioperative care to decrease morbidity with pancreatic surgery will also be discussed.

Enteral nutrition reduces delayed gastric emptying after standard pancreaticoduodenectomy with child reconstruction

BACKGROUND

Delayed gastric emptying (DGE) is a common complication following pancreaticoduodenectomy (PD). Our retrospective study aimed to evaluate the influence of enteral nutrition (EN) on DGE incidence after standard PD with antrectomy and Child reconstruction.

METHODS

We retrospectively analyzed 275 consecutive patients who underwent standard PD between January 2000 and September 2009. Patients operated on after January 2005 received EN (EN group, n = 152) until total oral alimentation. Patients operated on prior to 2005 did not receive EN (control group, n = 123) and were orally fed after removing the nasogastric tube. Primary endpoint was the incidence of DGE according to the International Study Group of Pancreatic Surgery criteria. Secondary endpoints were the incidence of any other complications.

RESULTS

The incidence of DGE was 26% vs. 38% (p = 0.04) in the EN and control groups, respectively, with 17% vs. 19% for grade B DGE (NS) and 9% vs. 19% for grade C DGE (p = 0.02). The differences in DGE did not significantly decrease the duration of stay (18 ± 11 vs. 19 ± 13 days; NS). Postpancreatectomy hemorrhage was significantly reduced in the EN group (8% vs. 20%, p = 0.008), with the incidence of postoperative pancreatic fistula being similar in both groups (15% vs. 12%; NS). Using multivariate analysis, EN (p = 0.047, OR = 0.559 [0.315; 0.994]), operative time (p < 0.001, OR = 1.007 [1.003; 1.010]), and patient age (p = 0.014, OR = 1.031 [1.006; 1.057]) were independent factors affecting the incidence of DGE.

CONCLUSIONS

EN reduces DGE and postpancreatectomy hemorrhage after PD.

Postoperative nutritional effects of early enteral feeding compared with total parental nutrition in pancreaticoduodectomy patients: a prosepective, randomized study

The benefits of early enteral feeding (EEN) have been demonstrated in gastrointestinal surgery. But, the impact of EEN has not been elucidated yet. We assessed the postoperative nutritional status of patients who had undergone pancreaticoduodenectomy (PD) according to the postoperative nutritional method and compared the clinical outcomes of two methods. A prospective randomized trial was undertaken following PD. Patients were randomly divided into two groups; the EEN group received the postoperative enteral feed and the control group received the postoperative total parenteral nutrition (TPN) management. Thirty-eight patients were included in our analyses. The first day of bowel movement and time to take a normal soft diet was significantly shorter in EEN group than in TPN group. Prealbumin and transferrin were significantly reduced on post-operative day (POD) 7 and were slowly recovered until POD 90 in the TPN group than in the EEN group. EEN group rapidly recovered weight after POD 21 whereas it was gradually decreased in TPN group until POD 90. EEN after PD is associated with preservation of weight compared with TPN and impact on recovery of digestive function after PD.

Analysis of risk factors for delayed gastric emptying (DGE) after 387 pancreaticoduodenectomies with usage of 70 stapled reconstructions

BACKGROUND

Delayed gastric emptying (DGE) is one of the most troublesome complications after pancreaticoduodenectomy (PD).

METHODS

Between 2004 and 2009, 387 patients underwent PD and of these, 302 patients (78%) underwent pylorus-preserving PD. The stapled reconstruction of duodeno- or gastrojejunostomy was introduced in 2006, and 70 patients (18%) underwent stapled Roux-en-Y reconstruction. Postoperative DGE was defined based on the International Study Group on Pancreatic Surgery classification, and grade B or C DGE was considered to be clinically relevant. Risk factors for DGE were evaluated using univariate and multivariate analyses.

RESULTS

Four patients died in the hospital (1.0%). Postoperative DGE was found in 70 patients (18%). DGE was less frequently seen in stapled reconstruction than in hand-sewn reconstruction (7.2% vs. 21%, P < 0.001), and in single-layer anastomosis than in double-layer anastomosis (12% vs. 24%, P = 0.02). The multivariate logistic regression analysis revealed that the independent risk factors for DGE were postoperative pancreatic fistula (risk ratio [RR] 2.4, P = 0.002), hand-sewn reconstruction (RR 2.9, P = 0.03) and male (RR 2.2, P = 0.02).

CONCLUSION

The method of alimentary reconstruction affected the occurrence of DGE. The incidence of DGE was less in stapled reconstruction than in hand-sewn reconstruction.

Effect of antecolic or retrocolic reconstruction of the gastro/duodenojejunostomy on delayed gastric emptying after pancreaticoduodenectomy: a randomized controlled trial

OBJECTIVE

To study the effect of antecolic vs. retrocolic reconstruction on delayed gastric emptying (DGE) after pancreaticoduodenectomy (PD) and to analyze factors which may be associated with post-PD DGE. DGE is a troublesome complication occurring in 30-40% of patients undergoing PD leading to increased postoperative morbidity. Many factors have been implicated in the pathogenesis of DGE. Among the various methods employed to reduce the incidence, recent reports have suggested that an antecolic reconstruction of gastro/duodenojejunostomy may decrease the incidence of DGE.

METHODS

Between Sep 2006 and Nov 2008, 95 patients requiring PD (for both malignant and benign conditions) were eligible for the study. Of these, 72 patients finally underwent a PD and were randomized to either a retrocolic or antecolic reconstruction of the gastro/duodenojejunostomy. All patients underwent the standard Whipple's or a pylorus preserving pancreaticoduodenectomy (PPPD), and the randomization was stratified according to the type of PD done. DGE was assessed clinically using the Johns Hopkins criteria (Yeo et al. in Ann Surg 218: 229-37, 1993). In patients suspected to have DGE, mechanical causes were excluded by imaging and/or endoscopy. Occurrence of DGE was the primary endpoint, whereas duration of hospital stay and occurrence of intra-abdominal complications were the secondary end points.

RESULTS

The antecolic and retrocolic groups were comparable with regard to patient demographics, diagnosis, and other preoperative, intraoperative, and postoperative factors. Overall, DGE occurred in 21 patients (30.9%). There was no significant difference in the incidence of DGE in the antecolic vs. the retrocolic group (34.4% vs. 27.8%; p = 0.6). On univariate analysis, older age, use of octreotide, and intra-abdominal complications were significantly associated with the occurrence of DGE; however, on a multivariate analysis, only age was found to be significant (p = 0.02). The mean postoperative stay was longer among patients who developed DGE (21.9 ± 9.3 days vs. 13 ± 6.9 days; p = 0.0001).

CONCLUSIONS

Delayed gastric emptying is a cause of significant morbidity and prolongs the duration of hospitalization following pancreaticoduodenectomy. The incidence of DGE does not appear to be related to the method of reconstruction (antecolic or retrocolic). Older age may be a risk factor for its occurrence.

Analysis of clinical trials evaluating complications after pancreaticoduodenectomy: a new era of pancreatic surgery

Pancreatic fistula and delayed gastric emptying (DGE) are the major postoperative complications of pancreaticoduodenectomy (PD). Pancreatic fistula is life-threatening and DGE, while not life-threatening, prolongs the hospital stay, increasing costs and compromising quality of life. To establish the current consensus of pancreatic fistula and DGE after PD, we analyzed the results of randomized controlled trials (RCTs) designed to prevent these postoperative complications. Five RCTs comparing PD with pylorus-preserving pancreaticoduodenectomy (PpPD) performed for periampullary tumors showed that the two procedures were equally effective with respect to morbidity, mortality, and survival. We reviewed 15 RCTs, 2 prospective nonrandomized studies, and 2 meta-analyses of operative techniques and postoperative management designed to prevent pancreatic fistula. The results of the RCTs designed to prevent pancreatic fistula recommended duct-to-mucosa pancreaticojejunostomy or one-layer end-to-side pancreaticojejunostomy, equally. We also reviewed five RCTs of operative techniques and postoperative management designed to prevent DGE, which revealed that the antecolic route for duodenojejunostomy significantly reduced the incidence of DGE. Further RCTs to study innovative approaches to prevent postoperative complications after PD are warranted.

Roux-en-Y reconstruction using staplers during pancreaticoduodenectomy: results of a prospective preliminary study

PURPOSE

The aim of this study was to reveal the utility of alimentary reconstruction using staplers during pancreaticoduodenectomy (PD), focusing on the occurrence of delayed gastric emptying.

METHODS

Between 2003 and 2007, 72 PDs with alimentary reconstruction were performed by a single surgeon. Since August 2006, the new Roux-en-Y reconstruction methods using staplers were applied in 26 of the patients. We compared their clinical outcomes with those of the 46 patients who underwent PD using the conventional hand-sewn reconstruction methods.

RESULTS

The results of upper gastrointestinal study showed improvement within 10 postoperative days (PODs; P = 0.03): the patients resumed eating their regular diet sooner (13 vs 6 days, P < 0.001), and both the incidence of delayed gastric emptying (43% vs 19%, P = 0.04) and the hospital stay (27 vs 21 days, P = 0.008) were reduced significantly in patients with stapled reconstruction. Despite the fact that operative costs were significantly higher for patients with stapled reconstruction (P = 0.009), hospital costs were significantly lower (P = 0.049) for those who underwent the conventional method.

CONCLUSIONS

Our retrospective analysis shows that stapled reconstructions might reduce the incidence of delayed gastric emptying; however, further study will be necessary to evaluate the utility of this new method.

Delayed gastric emptying: the state of the highest level of evidence

Delayed gastric emptying (DGE) has been regarded as the most common complication after pancreaticoduodenectomy (PD). Opinions about DGE and its incidence widely vary between studies and between institutions. To crystallize current concepts of DGE we resorted to a systematic literature search of level I evidence. We found 16 randomized controlled trials (RCTs) where DGE was measured but only 4 of these trials tested methods to influence DGE (erythromycin, enteral nutrition, or antecolic duodenojejunostomy). Constant heterogeneity for the definition of DGE was observed; 13 RCTs used 6 different clinical definitions based on some form of NG tube requirement after surgery, and the 3 remaining RCTs used non-clinical objective criteria. The most common element of the clinical definitions was the need for an NG tube >10 postoperative days. Ten RCTs used some form of this definition and the reported mean incidence of DGE was 17% however the range varied from 5% to 57%. The trials with the least number of cases appeared to have the widest variation in DGE incidence. We concluded after this systematic review that the disparate opinions about DGE could not be mediated with the highest level of evidence. The studies were underpowered or compromised by a lack of homogeneity in definition and design. The incidence of DGE cannot be succinctly measured; therefore the variables that influence DGE are not understood. We can begin to make progress by using the same definition such as the recently published definition provided by the International Study Group of Pancreatic Surgery.

Gastrointestinal function and quality of life after pylorus-preserving pancreatoduodenectomy

The pylorus-preserving pancreatoduodenectomy (PPPD) has taken the place of the conventional Whipple pancreatoduodenectomy as the standard procedure for various periampullary disease. With recent advances in surgical techniques and improvements in perioperative management, the number of long-term survivors after PPPD is increasing. As a result, surgeons should pay more attention to the patients' postoperative gastrointestinal function, nutrition, and quality of life (QOL). Gastric stasis, which is a frequent complication during the early postoperative period after PPPD, prolongs the hospital stay and impairs the QOL in the intermediate term. Several possible pathogeneses for this gastric stasis have been postulated; however, the precise mechanism remains unclear. The gastric emptying function gradually recovers to the preoperative level by 6 months after PPPD. Pancreatic functions are likely to be maintained for at least 1 year after PPPD; however, in some cases, they tend to gradually deteriorate over time after the operation, depending on the type of pancreatic reconstruction or the preoperative condition of the pancreas. It is important to note that preoperative and postoperative pancreatic exocrine function strongly influence the postoperative outcome regarding such factors as pancreatic fistula, body weight maintenance, nutrition, and the QOL. The QOL, as assessed by questionnaire, normally returns to the preoperative level within 6 months after PPPD, and this correlates with the changes in gastrointestinal function and nutritional status. It still remains an unresolved question, however, whether the Billroth-I PPPD really leads to better long-term nutritional status, but worse early gastric emptying function, than the Billroth-II type of reconstruction.

Therapeutic strategies for the management of delayed gastric emptying after pancreatic resection

BACKGROUND

Delayed gastric emptying (DGE) is one of the most troublesome postoperative complications following pancreatic resection. Not only does it contribute considerably to prolonged hospitalization, but it is also associated with increased postoperative morbidity and mortality.

METHODS

We performed an electronic and manual search of the international literature for studies dealing with the treatment of DGE following pancreatic resection using the Medline database. The search items used were "delayed gastric emptying," "pancreaticoduodenectomy," "Whipple procedure," "pylorus-preserving pancreaticoduodenectomy," and "complications following pancreatic resection" in various combinations.

RESULTS

A number of studies were identified regarding possible therapeutic alternatives for the treatment of DGE. From the class of prokinetic regimens, most studies seem to support the use of erythromycin. However, its use has not gained wide acceptance. Regarding the operative technique, both standard Whipple and pylorus-preserving pancreatic resection carry similar rates of DGE. Billroth II type-like gastrointestinal reconstruction is the most widely accepted method and is associated with lower rates of DGE. Reoperations for managing severe DGE were very rarely reported.

CONCLUSIONS

The incidence of DGE in high-volume centers specialized in pancreatic surgery is well below 20%, thus following the improved rates that have been reported in the last decade regarding mortality and length of hospital stay after pancreatic surgery. DGE mandates a uniform definition and method of evaluation to achieve homogeneity among studies. Standardization of the operative technique, as well as "centralizing" pancreatic resections in high-volume centers, should aid to improve the occurrence of this bothersome postoperative complication.

Recent randomized controlled trials in pancreaticoduodenectomy

OBJECTIVES

To analyze and summarize the recent randomized controlled trials (RCTs) investigating pancreaticoduodenectomy (PD).

METHODS

A MEDLINE search was performed to identify prospective RCTs on PD published during the last decade. Eligible RCTs were analyzed using the following items: publication year, geographical area, study theme, sample size, and multicenter study. Moreover, the quality of each RCT was evaluated.

RESULTS

Thirty-four articles were eligible for review. One to 6 RCTs have been carried out annually during the recent 10 years. Geographically, 15 trials were performed in Europe, 10 trials in North America, and 9 in Asia. Studies concerning postoperative complications in the early postoperative period such as pancreatic fistula and delayed gastric emptying have been most frequent. Randomized controlled trials comparing anastomotic procedures for the remnant pancreas, standard PD versus PD with extended lymphadenectomy, and PD versus pylorus-preserving PD follow in descending order. The average sample size has been 117, and 10 RCTs had sample size less than 50. The rate of multicenter studies among all RCTs is 21%, with the rate in the most recent 5 years having increased 2-fold compared with that in the earlier period. Concerning the quality of RCTs, calculation of sample size was described in only 14 RCTs and intention to treat analysis was performed in 26 RCTs.

CONCLUSIONS

This study reviewed 34 RCTs on PD performed all over the world. Although the quality of every RCT was not satisfactory, high-grade evidence obtained by these RCTs should be applied in clinical settings to improve surgical quality and quality of life for each patient.

[Continuous enteral nutrition versus single bolus: effects on urine C peptide and nitrogen balance]

BACKGROUND AND OBJECTIVE

Our study was designed to assess the impact on nitrogen and glucose metabolism when it is administered either as discontinuous or as continuous infusion.

PATIENTS AND METHOD

We assessed the nutritional efficacy (nitrogen balance) and hyperinsulinism risk (urine C peptide excretion) of enteral nutrition in 23 patients hospitalized because of acute stroke.

RESULTS

The feeding tolerance of our enteral nutrition protocol (nasoenteric catheter) was full in every patient. The nitrogen balance was positive in both patterns, but the balance in the continuous feeding pattern was better than in the bolus feeding one. On the contrary, the urine C peptide excretion was increased when enteral nutrition was administered intermittently as compared with continuous feeding. Calciuria was greater in the continuous fed pattern than in the bolus feeding.

CONCLUSIONS

Continuous feeding is associated with better nitrogen balance and less urine C peptide excretion than intermittent feeding. These results suggest that continuous feeding would be an interesting choice to improve glucose control in diabetic patients with enteral nutrition.

Gastric decompression and enteral feeding through a double-lumen gastrojejunostomy tube improves outcomes after pancreaticoduodenectomy

OBJECTIVE

The objective of this study was to assess the feasibility and safety of inserting a double-lumen gastrojejunostomy tube (GJT) after pancreaticoduodenectomy (PD) and to evaluate associated outcomes.

BACKGROUND

Gastroparesis is a frequent postoperative event following PD. This often necessitates prolonged gastric decompression and nutritional support. A double-lumen GJT may be particularly useful in this situation: gastric decompression may be achieved through the gastric port without a nasogastric tube; enteral feeding may be administered through the jejunal port.

METHODS

Thirty-six patients with periampullary tumors were randomized at the time of PD to insertion of GJT or to the routine care of the operating surgeon. Outcomes, including length of stay, complications, and costs, were followed prospectively.

RESULTS

The 2 groups had similar characteristics. Prolonged gastroparesis occurred in 4 controls (25%) and in none of the patients who had a GJT (P = 0.03). Complication rates were similar in each group. Mean postoperative length of stay was significantly longer in controls compared with patients who had a GJT (15.8 +/- 7.8 days versus 11.5 +/- 2.9 days, respectively; P = 0.01). Hospital charges were 82,151 +/- 56,632 dollars in controls and 52,589 +/- 15,964 dollars in the GJT group (P = 0.036).

CONCLUSIONS

In patients undergoing PD, insertion of a GJT is safe. Moreover, insertion of a GJT improves average length of stay. At the time of resection of periampullary tumors, GJT insertion should be considered, especially given this is a patient population in which weight loss and cachexia are frequent.

Current standards of surgery for pancreatic cancer

Background

Pancreatic cancer carries a dismal prognosis but there has been a vast increase in evidence on its management in the past decade.

Methods

An electronic and manual search was performed for articles on the surgical treatment of pancreatic cancer published in the past 10 years.

Results

Six major areas of advancement were identified. Groups at high risk of developing pancreatic cancer, notably those with chronic pancreatitis and hereditary pancreatitis, have been defined, raising the need for secondary screening. Methods of staging pancreatic cancer for resection have greatly improved but accuracy is still only 85–90 per cent. Pylorus-preserving partial pancreatoduodenectomy without extended lymphadenectomy is the simplest procedure; it does not compromise long-term survival. Adjuvant chemotherapy significantly improves long-term survival. Patients who are free from major co-morbidity have better palliation by surgery (with a double bypass) than by endoscopy. High-volume centres improve the results of surgery for all outcome measures including long-term survival.

Conclusion

The surgical management of pancreatic cancer has undergone a significant change in the past decade. It has moved away from no active treatment. The standard of care can now be defined as potentially curative resection in a specialist centre followed by adjuvant systemic chemotherapy.

Delayed gastric emptying after pylorus-preserving pancreatoduodenectomy is strongly related to other postoperative complications

Patients undergoing pylorus-preserving pancreatoduodenenectomy (PPPD) have a risk of up to 50% for developing delayed gastric emptying (DGE) in the early postoperative course. From 1994 to August 2002, a total of 204 patients underwent PPPD for pancreatic or periampullary cancer (50%), chronic pancreatitis (42%), and other indications (8%). Retrocolic end-to-side duodenojejunostomy was performed below the mesocolon. DGE was defined by the inability to tolerate a regular diet after day 10 (DGE10) or day 14 (DGE14) postoperatively, as well as the need for a nasogastric tube at or beyond day 10 (DGE10GT). Postoperative morbidity was 38%, 30-day mortality was 2.9%, and median postoperative length of stay was 15 days. DGE occurred in 14.7% (DGE10), 5.9% (DGE14), and 6.4% (DGE10GT), respectively. After further exclusion of 21 patients (10.3%) with major complications and no possible oral intake (because of death, reoperation, or mechanical ventilation), the frequencies of DGE10, DGE14, and DGE10GT in the remaining group of 183 patients were 9%, 2%, and 2%, respectively. Multivariate analysis revealed postoperative complications (P<0.001), the presence of portalvenous hypertension (P<0.01), and tumors as indications for surgery (P<0.01) as independent risk factors for DGE10. The overall incidence of DGE was low after PPPD. In those patients experiencing DGE, however, other postoperative complications were the most important factor associated with its occurrence.

Pancreatoduodenectomy in the treatment of chronic pancreatitis

The value of surgical resection for patients with chronic pancreatitis has been debated on account of persistent symptoms and the morbidity of the operative procedure, both immediate and delayed. This paper explores the consequence of pancreatoduodenectomy in 175 patients with chronic pancreatitis who were operated on between 1976 and 1997. All patients were carefully selected after varying periods of conservative management. The operation was a classical Kausch-Whipple resection in 98 patients and a pylorus-preserving procedure in 67. There were four postoperative deaths (days 7, 10, 35, and 70), and only two reoperations were performed. The median number of postoperative events was one, with delayed gastric emptying being the most common (31 patients). The median length of in-hospital stay was 20 days (range: 8-215 days), but no patient was discharged until medical and social disabilities were resolved. There were seven late deaths, most of them linked to cigarette smoking and alcohol consumption; 75% of patients had a good clinical outcome, but 18 patients required further pancreatic surgery at a mean of 12 months, either a pancreatojejunostomy or a completion pancreatectomy. Diabetes occurred in 40% of patients by 5 years, and most, at some stage of their postoperative period, required pancreatic enzyme supplementation. It is suggested that resection of the pancreas provides a reasonable life-style in 75% of patients, but the outcome depends in large part on the predisposing disease.

Delayed gastric emptying after pylorus-preserving pancreatoduodenectomy is strongly related to other postoperative complications

Patients undergoing pylorus-preserving pancreatoduodenenectomy (PPPD) have a risk of up to 50% for developing delayed gastric emptying (DGE) in the early postoperative course. From 1994 to August 2002, a total of 204 patients underwent PPPD for pancreatic or periampullary cancer (50%), chronic pancreatitis (42%), and other indications (8%). Retrocolic end-to-side duodenojejunostomy was performed below the mesocolon. DGE was defined by the inability to tolerate a regular diet after day 10 (DGE10) or day 14 (DGE14) postoperatively, as well as the need for a nasogastric tube at or beyond day 10 (DGE10GT). Postoperative morbidity was 38%, 30-day mortality was 2.9%, and median postoperative length of stay was 15 days. DGE occurred in 14.7% (DGE10), 5.9% (DGE14), and 6.4% (DGE10GT), respectively. After further exclusion of 21 patients (10.3%) with major complications and no possible oral intake (because of death, reoperation, or mechanical ventilation), the frequencies of DGE10, DGE14, and DGE10GT in the remaining group of 183 patients were 9%, 2%, and 2%, respectively. Multivariate analysis revealed postoperative complications (P<0.001), the presence of portalvenous hypertension (P<0.01), and tumors as indications for surgery (P<0.01) as independent risk factors for DGE10. The overall incidence of DGE was low after PPPD. In those patients experiencing DGE, however, other postoperative complications were the most important factor associated with its occurrence.

Benefits and limitations of enteral nutrition in the early postoperative period

BACKGROUND

Preexisting malnutrition has been shown to be a major clinical problem in surgical patients. Surgical stress itself increases the energy expenditure and protein loss making necessary the early nutritional support. Although there is strong evidence that "nil by mouth" is not justified, the data are still conflicting over the role of early enteral nutrition compared with the traditional methods of postoperative feeding including total parenteral nutrition support.

METHODS AND FOCUS

This paper deals with the various trials related to early enteral feeding. It also compares this with the possible advantages of total parenteral nutrition as a method of perioperative nutritional support in patients undergoing gastrointestinal surgery.

Evidence-based pancreatic head resection for pancreatic cancer and chronic pancreatitis

OBJECTIVE

To review the current status of pancreatoduodenectomy for pancreatic cancer and chronic pancreatitis using evidence-based methodology.

SUMMARY BACKGROUND DATA

Despite improved results of pancreatoduodenectomy over the recent years, the reputation of the Whipple procedure and its main modifications has remained poor. In addition, the current status of newer modifications of standard pancreatoduodenectomy is still under debate.

METHODS

Medline search and manual cross-referencing were performed to identify all relevant articles for classification and analysis according to their quality of evidence. The search was limited to articles published between 1990 and 2001.

RESULTS

The mortality rate of pancreatoduodenectomy has declined to less than 5% for chronic pancreatitis and 3% to 8% for pancreatic cancer. In contrast, overall morbidity rates remain high, ranging between 20% and 70%. Delayed gastric emptying represents almost half of all complications. The overall 5-year survival rate for patients with pancreatic cancer remains poor, ranging between 5% and 15%, with a median survival of 13 to 17 months. Mortality and morbidity are not related to the type of pancreatoduodenectomy; however, patients with pancreatic cancer tend to be at increased risk for complications. Extended lymph node dissection and portal vein resection can be performed with similar mortality and morbidity rates as standard procedures, but without apparent survival benefits in the long term. Major relief of pain is achieved in 70% to 100% of patients with chronic pancreatitis.

CONCLUSIONS

Pancreatoduodenectomy and its main modifications are safe and effective treatment modalities, especially in experienced centers with a high patient volume. For chronic pancreatitis, surgical resection provides major relief of pain and thus increased quality of life. Overall survival for patients with pancreatic cancer is determined predominantly by the pathology within the resected specimen.

Quality of complication reporting in the surgical literature

OBJECTIVE

To identify 10 critical elements of accurate and comprehensive reports of surgical complications.

SUMMARY BACKGROUND DATA

Despite a venerable tradition of weekly morbidity and mortality conferences, inconsistent complication reporting is common in the surgical literature.

METHODS

An analysis of articles reporting short-term outcomes after pancreatectomy, esophagectomy, and hepatectomy was performed. Randomized clinical trials (RCTs) published from 1975 to 2001 and retrospective series of more than 100 patients published from 1990 to 2001 were reviewed.

RESULTS

A total of 119 articles reporting outcomes in 22,530 patients were analyzed. This included 42 RCTs and 77 retrospective series. Of the 10 criteria developed, no articles met all criteria; 2% met 9 criteria, 38% 7 or 8, 34% 5 or 6, 40% 3 or 4, and 12% 1 or 2. Outpatient information (22% of articles), definitions of complications provided (34% of articles), severity grade used (20% of articles), and risk factors included in analysis (29% of articles) were the most commonly unmet quality reporting criteria. Type of study (RCT vs. retrospective), site of institution (U.S. vs. non-U.S.) and journal (U.S. vs. non-U.S.) did not influence the quality of complication reporting.

CONCLUSIONS

Short-term surgical outcomes are routinely included in the data reported in the surgical literature. This is often used to show improvements over time or to assess the impact of therapeutic changes on patient outcome. The inconsistency of reporting and the lack of accepted principles of accrual, display, and analysis of complication data argue strongly for the creation and generalized use of standards for reporting this information.

Pylorus-preserving pancreatoduodenectomy: influence of a Billroth I versus a Billroth II type of reconstruction on gastric emptying

BACKGROUND/AIM

Delayed gastric emptying (DGE) is a frequent problem after pylorus-preserving pancreatoduodenectomy. Important risk factors are the presence of intra-abdominal complications. Searching for other causes, this study evaluates the influence of the type of reconstruction after a pancreatoduodenectomy (Billroth I vs. Billroth II; B I vs. B II on DGE.

METHODS

A retrospective study was performed evaluating consecutive patients from two surgical institutes. 174 patients were included (B II type of reconstruction n = 123, period 1992-1996; B I type of reconstruction n = 51, period 1988-1998). DGE was defined by gastric stasis requiring nasogastric intubation for 10 days or more or the inability to tolerate a regular diet on or before the 14th postoperative day.

RESULTS

After a B I type of reconstruction, there was significantly longer nasogastric intubation period as compared with a B II type of reconstruction (B I median 13 days, range 4-47, B II median 6 days, range 1-40; p < 0.05). There was no difference in postoperative commencement of a normal diet. Also significantly more patients had DGE after a B I (76%) as compared with a B II type of reconstruction (32%; p < 0.05).

CONCLUSIONS

The results of this study indicate a significantly higher incidence of DGE after a B I type of reconstruction as compared with a B II type reconstruction. The etiology remains speculative.

Rates of complications and death after pancreaticoduodenectomy: risk factors and the impact of hospital volume

OBJECTIVE

To perform a two-part study of pancreaticoduodenectomy in the Netherlands, focusing on the effects of risk factors on outcomes in a single high-volume hospital and the effect of hospital volume on outcomes.

SUMMARY BACKGROUND DATA

Hospital volume and surgeon caseload can be related to the rates of complications and death, and the influence of risk factors can be volume-dependent. Provision of regionalized care should take this into account.

METHODS

In part A, a single-institution database on 300 consecutive patients undergoing pancreaticoduodenectomy was divided into two periods with similar numbers of patients. Overall complications, deaths, hospital stay, and risk factors were analyzed in the two periods and compared with an historical reference group. In part B, Netherlands medical registry data on age and postoperative death of patients who underwent partial pancreaticoduodenectomy from 1994 to 1998 were analyzed for the influence of hospital volume on death.

RESULTS

Between the time periods, the institutional death rate decreased from 4.9% to 0.7%, the complication rate from 60% to 41%. Median hospital stay decreased from 24 to 15 days. The death rate was not related to patient age and did not differ between surgeons. Serum creatinine levels, need for blood transfusion, and period of resection were independent risk factors for complications. The death rate after pancreaticoduodenectomy in the Netherlands was 12.6% in 1994 and 10.1% in 1998; it was greater in patients older than age 65. During the 5-year period, 40% of the procedures were performed in hospitals performing fewer than five resections per year, and the death rate was greater than in hospitals performing more than 25 resections per year.

CONCLUSIONS

The overall death rate after pancreaticoduodenectomy did not decrease significantly during the period, and it was greater in low-volume hospitals and older patients. The lower death and complication rates in high-volume hospitals, including the single-center outcomes, were similar to those reported in other countries and may be due to better prevention and management of complications. Pancreaticoduodenectomy should be performed in centers with sufficient experience and resources for support.

Artificial nutrition after pancreaticoduodenectomy

Patients undergoing pancreaticoduodenectomy (PD) often require postoperative artificial nutrition. This trial was undertaken to evaluate whether the route of administration and the composition of the postoperative nutritional support could affect the immunometabolic response and outcome. A prospective, randomized trial was carried out in 212 subjects who underwent PD. Patients were randomized to receive a standard enteral formula (standard group, n = 73) or an enteral formula enriched with arginine, omega-3 fatty acids, and RNA (immunonutrition group, n = 71), or total parenteral nutrition (parenteral group, n = 68). Postoperative feeding started 6 hours after surgery. The three regimens were isocaloric and isonitrogenous. Assessed parameters were phagocytosis ability of polymorphonuclear cells, plasma interleukin-2 receptors, C-reactive protein, retinol binding protein, tolerance of enteral feeding, rate of postoperative complications, and length of hospital stay (LOS). Full nutritional goal (25 kcal/kg) was achieved in 87% of enterally fed patients versus 95% in the parenteral group. Subjects receiving immunonutrition had a significantly better recovery of the immunometabolic parameters on postoperative day 8 compared to the other two groups. The rate of postoperative complications was lower in the immunonutrition group (33.8%) than in either the standard (43.8%) or parenteral group (58.8%) (p = 0.005 immunonutrition vs. parenteral). Also, the mean LOS was shorter in the immunonutrition group than in the standard and parenteral groups (15.1 vs. 17.0 vs. 18.8 days, respectively; p < 0.05). Early postoperative enteral feeding may safely and effectively replace parenteral nutrition in patients undergoing PD. Immunonutrition ameliorates the immunometabolic response and improves outcome compared to parenteral feeding.