A step-up approach or open necrosectomy for necrotizing pancreatitis

The revised Atlanta classification of acute pancreatitis: its importance for the radiologist and its effect on treatment

An international working group has modified the Atlanta classification for acute pancreatitis to update the terminology and provide simple functional clinical and morphologic classifications. The modifications (a) address the clinical course and severity of disease, (b) divide acute pancreatitis into interstitial edematous pancreatitis and necrotizing pancreatitis, (c) distinguish an early phase (1st week) and a late phase (after the 1st week), and (d) emphasize systemic inflammatory response syndrome and multisystem organ failure. In the 1st week, only clinical parameters are important for treatment planning. After the 1st week, morphologic criteria defined on the basis of computed tomographic findings are combined with clinical parameters to help determine care. This revised classification introduces new terminology for pancreatic fluid collections. Depending on presence or absence of necrosis, acute collections in the first 4 weeks are called acute necrotic collections or acute peripancreatic fluid collections. Once an enhancing capsule develops, persistent acute peripancreatic fluid collections are referred to as pseudocysts; and acute necrotic collections, as walled-off necroses. All can be sterile or infected. Terms such as pancreatic abscess and intrapancreatic pseudocyst have been abandoned. The goal is for radiologists, gastroenterologists, surgeons, and pathologists to use the revised classifications to standardize imaging terminology to facilitate treatment planning and enable precise comparison of results among different departments and institutions.

Minimally invasive treatment of pancreatic disease

Minimally invasive surgery has been widely accepted as an alternative to conventional open surgery in many gastrointestinal fields and is now considered the standard of care in bariatric surgery as well as oncologic surgery of the colon and stomach. Despite the advancements in laparoscopic surgery instrumentation and technique, the anatomic relationships of the pancreas and the need for complex reconstructions have slowed similar progress in management of pancreatic disease. However, numerous recent studies show promising results in laparoscopic management of pancreatic pseudocyst, necrosis, and benign and malignant pancreatic neoplasms. We present the current status of clinical application of minimally invasive techniques for the treatment of complicated pancreatitis, chronic pancreatitis, and pancreatic neoplasms, and provide a review of the relevant literature. Present day and probable future developments, such as the use of robotics, natural orifice techniques, and major vascular reconstruction are also presented.

Percutaneous catheter drainage for infective pancreatic necrosis: is it always the first choice for all patients?

OBJECTIVE

To learn the clinical outcome of percutaneous catheter drainage (PCD) for patients with infective pancreatic necrosis and the possible influencing factors.

METHODS

A retrospective review of medical records of patients with infective pancreatic necrosis who received PCD as the first choice for treatment in the recent 2 years. The patients were divided into 2 groups: (1) PCD success group and (2) PCD alteration group. Characteristics, complications, and PCD process were compared.

RESULTS

In this study, 19 of 34 patients were cured by PCD alone (55.9%), whereas open necrosectomy were needed for 15 patients (44.1%). Between these 2 groups, most baseline and clinical characteristics did not show any statistical difference, including the number and size of catheter used and the bacterial culture result. The PCD alteration group had higher mean computed tomographic density (P = 0.012) and larger distribution range of infected pancreatic necrosis (4.53 ± 1.35 vs 5.93 ± 1.62; P = 0.009) than the PCD success group (P < 0.01). The logistic regression analysis revealed the same facts.

CONCLUSION

The mean computed tomographic density and distribution range of infective pancreatic necrosis could significantly influence the success rate of PCD; higher values of them indicate less appropriate for PCD; thus, it should be considered seriously before the treatment decision.

Modern management of acute pancreatitis

There is a rising incidence of acute pancreatitis in the United States. Numerous clinical prognostic scoring systems have been developed, including the BISAP score. Vigorous fluid resuscitation remains a cornerstone of early management of acute pancreatitis. Cross-sectional imaging in the early phase of evaluation has not been associated with improvement of outcomes. There is no role for prophylactic antibiotics in early management. However, there is growing emphasis on the identification and treatment of extrapancreatic infections. Enteral nutrition in severe acute pancreatitis has reduced mortality, systemic infection, and multiorgan dysfunction compared to parenteral nutrition. Conservative management consisting of percutaneous drainage and delayed surgical intervention is now favored for local complications, such as infected necrosis. These developments have contributed to improved outcomes for patients with acute pancreatitis.

The minimally invasive approach to surgical management of pancreatic diseases

Laparoscopic pancreas surgery has undergone rapid development over the past decade. Although acceptability among traditional surgeons has been low, emerging specialty centers are reporting excellent outcomes for advanced and complex operations, such as pancreaticoduodenectomy. A note of caution is necessary: These outstanding results are from skilled surgeons, many of whom are pioneers in the field, who have overcome the learning curve over many years of innovation. As the procedures gain wider practice, outcomes need to be carefully watched because many of these procedures are extremely demanding technically. Although many have suggested that controlled, randomized studies comparing laparoscopic pancreatic resections with open resections are necessary to establish the efficacy of laparoscopic procedure, the cumulative data on the safety and efficacy of the laparoscopic procedure argues against such an approach. The logistic difficulties of conducting such studies will be considerable given patient preferences, the need for multicenter studies, and the rapid adoption of the laparoscopic procedure among experienced pancreatic surgeons. A more reasonable approach to truly evaluate the safety of these procedures is the establishment of a national registry that can measure progress of the field and record outcomes in the wider, nonspecialty community. Hepatobiliary training programs should also establish a minimal standard of training for many of the advanced procedures, such as the pancreaticoduodenectomy, so that the benefit of laparoscopic surgery can be made available outside of just a few specialty centers.

Multivariate analysis of factors influencing medical costs of acute pancreatitis hospitalizations based on a national administrative database

BACKGROUND

Little information is available on the analysis of medical costs of acute pancreatitis hospitalizations.

AIM

This study aimed to determine the factors affecting medical costs of patients with acute pancreatitis during hospitalization using a Japanese administrative database.

METHODS

A total of 7193 patients with acute pancreatitis were referred to 776 hospitals. We defined "patients with high medical costs" as patients whose medical costs exceeded the 90th percentile in medical costs during hospitalization and identified the independent factors for patients with high medical costs with and without controlling for length of stay.

RESULTS

Multiple logistic regression analysis demonstrated that necrosectomy was the most significant factor for medical costs of acute pancreatitis during hospitalization. The odds ratio of necrosectomy was 33.64 (95% confidence interval, 14.14-80.03; p<0.001). Use of an intensive care unit was the most significant factor for medical costs after controlling for LOS. The OR of an ICU was 6.44 (95% CI, 4.72-8.81; p<0.001).

CONCLUSION

This study demonstrated that necrosectomy and use of an ICU significantly affected the medical costs of acute pancreatitis hospitalization. These results highlight the need for health care implementations to reduce medical costs whilst maintaining the quality of patient care, and targeting patients with severe acute pancreatitis.

Dual modality drainage for symptomatic walled-off pancreatic necrosis reduces length of hospitalization, radiological procedures, and number of endoscopies compared to standard percutaneous drainage

BACKGROUND

Symptomatic walled-off pancreatic necrosis (WOPN) treated with dual modality endoscopic and percutaneous drainage (DMD) has been shown to decrease length of hospitalization (LOH) and use of radiological resources in comparison to standard percutaneous drainage (SPD).

AIM

The aim of this study is to demonstrate that as the cohort of DMD and SPD patients expand, the original conclusions are durable.

METHODS

The database of patients receiving treatment for WOPN between January 2006 and April 2011 was analyzed retrospectively.

PATIENTS

One hundred two patients with symptomatic WOPN who had no previous drainage procedures were evaluated: 49 with DMD and 46 with SPD; 7 were excluded due to a salvage procedure.

RESULTS

Patient characteristics including age, sex, etiology of pancreatitis, and severity of disease based on computed tomographic severity index were indistinguishable between the two cohorts. The DMD cohort had shorter LOH, time until removal of percutaneous drains, fewer CT scans, drain studies, and endoscopic retrograde cholangiopancreatography (ERCPs; p < 0.05 for all). There were 12 identifiable complications during DMD, which were successfully treated without the need for surgery. The 30-day mortality in DMD was 4% (one multi-system organ failure and one out of the hospital with congestive heart failure). Three patients receiving SPD had surgery, and three (7%) died in the hospital.

CONCLUSION

DMD for symptomatic WOPN reduces LOH, radiological procedures, and number of ERCPs compared to SPD.

Short-term outcomes from a multicenter retrospective study in China comparing laparoscopic and open surgery for the treatment of infected pancreatic necrosis

BACKGROUND

Laparoscopic surgery for confirmed infected pancreatic necrosis (IPN) represents a relatively new solution. There are no studies comparing the outcomes of laparoscopic and open surgery for patients with IPN. The aims of this study were to investigate the feasibility of laparoscopic management for patients with IPN and to compare the outcomes of laparoscopic and open surgery.

METHODS

Seventy-six patients with IPN who underwent open surgery (Open-group) or laparoscopic surgery (Lap-group) were retrospectively reviewed. Demographic data, white blood cell count, and APACHE II score upon admission, operative findings, major complications, and mortality were compared between the Open-group and the Lap-group. The Lap-group was further divided into two subgroups (early and late), and the operative difficulty was compared between the two subgroups.

RESULTS

There were no significant differences between the Open-group and the Lap-group with respect to demographic data, white blood cell count, and APACHE II score. Although the mean operative time was significantly shorter in the Open-group than in the Lap-group, the estimated blood loss was significantly greater in the Open-group than in the Lap-group, as was the rate of complications. The mean postoperative hospital stay in the Open-group was significant longer than in the Lap-group, too. In the Lap-group, the mean operating time, estimated blood loss, and conversion rate in the early subgroup were significantly lower than in the late subgroup.

CONCLUSION

Laparoscopic necrosectomy and the placement of an intermittent irrigation and continuous suction drainage system for IPN is feasible, effective, and of minimal invasiveness. The late laparoscopic necrosectomy is relatively difficult.

Long-term results after endoscopic drainage and necrosectomy of symptomatic pancreatic fluid collections

AIMS

To determine the immediate and long-term results of endoscopic drainage and necrosectomy for symptomatic pancreatic fluid collections.

METHODS

The data of 80 patients with symptomatic pancreatic fluid collections (mean diameter: 11.7 cm, range 3-20; pseudocysts: 24/80, abscess: 20/80, infected walled-off necrosis: 36/80) referred for endoscopic management from October 1997 to March 2008 were analyzed retrospectively.

RESULTS

Endoscopic drainage techniques included endoscopic ultrasound (EUS)-guided aspiration (2/80), EUS-guided transenteric drainage (70/80) and non-EUS-guided drainage across a spontaneous transenteric fistula (8/80). Endoscopic necrosectomy was carried out in 49/80 (abscesses: 14/20; infected necrosis: 35/36). Procedural complications were bleeding (12/80), perforation (7/80), portal air embolism (1/80) and Ogilvie Syndrome (1/80). Initial technical success was achieved in 78/80 (97.5%) and clinical resolution of the collections was achieved endoscopically in 67/80 (83.8%), with surgery required in 13/80 (perforation: four; endoscopically inaccessible areas: two; inadequate drainage: seven). Within 6 months five patients required surgery due to recurrent fluid collections; over a mean follow up of 31 months, surgery was required in four more patients due to recurrent collections as a consequence of underlying pancreatic duct abnormalities that could not be treated endoscopically. The long-term success of endoscopic treatment was 58/80 (72.5%).

CONCLUSIONS

Endoscopic drainage of symptomatic pancreatic fluid collections is safe and effective, with excellent immediate and long-term results. Endoscopic necrosectomy has a risk of serious complications. The underlying pancreatic duct abnormalities must be addressed to prevent recurrence of fluid collections.

Management of severe acute pancreatitis

Severe acute pancreatitis (SAP) develops in about 25% of patients with acute pancreatitis. Severity of acute pancreatitis is linked to the presence of systemic organ dysfunctions and/or necrotizing pancreatitis. Risk factors independently determining the outcome of SAP are early multiorgan failure (MOF), infection of necrosis, and extended necrosis (>50%). Morbidity of SAP is biphasic, in the first week it is strongly related to systemic inflammatory response syndrome while, sepsis due to infected pancreatic necrosis leading to MOF syndrome occurs in the later course after the first week. Contrast-enhanced computed tomography provides the highest diagnostic accuracy for necrotizing pancreatitis when performed after the first week of disease. Patients who suffer early organ dysfunctions or are at risk for developing a severe disease require early intensive care treatment. Antibiotic prophylaxis has not been shown as an effective preventive treatment. Early enteral feeding is based on a high level of evidence, resulting in a reduction of local and systemic infection. Patients suffering infected necrosis causing clinical sepsis are candidates for intervention. Hospital mortality of SAP after interventional or surgical debridement has decreased to below 20% in high-volume centers.

Management of severe acute pancreatitis

Severe acute pancreatitis (SAP) develops in about 25% of patients with acute pancreatitis. Severity of acute pancreatitis is linked to the presence of systemic organ dysfunctions and/or necrotizing pancreatitis. Risk factors independently determining the outcome of SAP are early multiorgan failure (MOF), infection of necrosis, and extended necrosis (>50%). Morbidity of SAP is biphasic, in the first week it is strongly related to systemic inflammatory response syndrome while, sepsis due to infected pancreatic necrosis leading to MOF syndrome occurs in the later course after the first week. Contrast-enhanced computed tomography provides the highest diagnostic accuracy for necrotizing pancreatitis when performed after the first week of disease. Patients who suffer early organ dysfunctions or are at risk for developing a severe disease require early intensive care treatment. Antibiotic prophylaxis has not been shown as an effective preventive treatment. Early enteral feeding is based on a high level of evidence, resulting in a reduction of local and systemic infection. Patients suffering infected necrosis causing clinical sepsis are candidates for intervention. Hospital mortality of SAP after interventional or surgical debridement has decreased to below 20% in high-volume centers.

Management of pancreatic fluid collections: a changing of the guard from surgery to endoscopy

The aim of this study was to assess for any trend in management of pancreatic fluid collections (PFCs) and identify impacting factors. The endoscopy and surgical databases were queried for PFC patients. PFCs were categorized as pseudocysts (PP) or complex collections (CC) that included abscess/necrosis. The outcome measures were to compare the utilization of surgery and endoscopy from 2004 to 2007 (group I) and from 2008 to 2010 (group II) and identify factors impacting practice patterns. A total of 285 patients were treated: group I included 119 and group II 166. Of 119 group I patients, 29 per cent were treated by surgery and 71 per cent by endoscopy. Of 85 endoscopy patients, 42 per cent were drained by conventional transmural drainage and 58 per cent by endoscopic ultrasound (EUS). Of 166 group II patients, 31 per cent were treated surgically and 69 per cent endoscopically. Of the 115 endoscopy patients, 17 per cent were drained by conventional transmural drainage and 83 per cent by EUS. Compared with group I, all pseudocysts in group II were treated by endoscopy (84% vs 100%, P = 0.001). There was no difference in the rate of CC treated by endoscopy between both groups (57.7% vs 56.8%, P = 0.9). PFCs not causing luminal compression (P < 0.0001) or measuring <9 cm in size (P < 0.0001) were more likely to require EUS. There was a significant trend at our institution in the management of PFCs with all pseudocysts presently being treated only by endoscopy. The ability of EUS to access smaller size PFCs and those not causing luminal compression has significantly expanded the role of endoscopy in PFC management.

[Pancreatic necrosis: pro surgical therapy]

Currently, patients with severe necrotizing pancreatitis rarely need interventional or surgical treatment. However, in case of pancreatic infection and septic complications they should be treated with the step up approach, primarily with an interventional or endoscopic drainage. If further clinical deterioration occurs necrosectomy is indicated. This should ideally be postponed until the third or fourth week after onset of pancreatitis to optimize surgical conditions including demarcation of the necrosis. Open necrosectomy with postoperative continuous lavage is a valid treatment option with low mortality, low morbidity and good long-term outcome. In recent years, several minimally invasive techniques for necrosectomy have been developed and are alternative approaches in about 70% of cases. In most cases, the retroperitoneoscopic approach is used, although the endoscopic transgastric route is also being used more and more frequently. While the reduced operative trauma should theoretically also reduce the onset of postoperative organ failure, no study has actually proven this.

Update lecture: benign diseases of the exocrine pancreas

A brief overview on the physiology and regulation of digestive enzyme secretion by the exocrine pancreas is presented. Knowledge about the physiology of the exocrine pancreas should help for a better understanding of the pathophysiology of both acute and chronic pancreatitis. In the pathophysiology of acute pancreatitis, fusion of zymogen granules with lysosomes, which leads to intracellular activation of trypsinogen, is still regarded as a key step in pathophysiology. The role of activation by cathepsins and the role of autoactivation of trypsinogen are still under debate. Studies on genetic alterations in various forms of human chronic pancreatitis can be interpreted that an imbalance between protease inhibitors and active proteases plays a key role. Toxic Ca(2+) signals by excessive liberation from the endoplasmic reticulum may play another role. The mortality of necrotizing pancreatitis is still high. Early mortality is caused by a systemic inflammatory response syndrome with or without concomitant infection of necrosis; late mortality by multi-organ failure syndrome due to sepsis. Therapy of necroses should be performed as late as possible. A step-up approach using CT-guided and/or transgastric endoscopic necrosectomy seems to be superior to a primary surgical approach. A brief overview of the German S3 guidelines, not yet published, regarding diagnosis and treatment of chronic pancreatitis is presented.

Antioxidant therapy in acute pancreatitis: experimental and clinical evidence

SIGNIFICANCE

Oxidative stress plays an important role in the pathogenesis of both acute and chronic pancreatitis. Although its impact is well investigated and has been studied clinically in chronic pancreatitis, it is less well defined for acute pancreatitis.

RECENT ADVANCES

Pathophysiological aspects of oxidative stress in acute pancreatitis have shown that reactive oxidative species (ROS) participate in the inflammatory cascade, and mediate inflammatory cell adhesion and consecutive tissue damage. Furthermore, ROS are involved in the generation of pain as another important clinical feature of patients suffering from acute pancreatitis.

CRITICAL ISSUES

Despite sufficient basic and experimental knowledge and evidence, the step from bench to bedside has not been successfully performed. Only a limited number of clinical studies are available that can give convincing evidence for the use of antioxidants in the clinical setting of acute pancreatitis.

FUTURE DIRECTIONS

Future studies are required to evaluate potential benefits of antioxidative substances to attenuate the severity of acute pancreatitis. Special focus should be put on the aspect of pain generation and the progression from mild to severe acute pancreatitis in the clinical setting.

Endoscopic transmural drainage of peripancreatic fluid collections: outcomes and predictors of treatment success in 211 consecutive patients

OBJECTIVES

Endoscopy is a minimally invasive technique for the drainage of peripancreatic fluid collections. This study evaluated the clinical outcomes and predictors of treatment success in consecutive patients undergoing endoscopic transmural drainage of peripancreatic fluid collections.

METHODS

This is a retrospective study of patients who underwent endoscopic drainage of peripancreatic fluid collections over 7 years. Prior to drainage, an ERCP was attempted for stent placement in all patients with a pancreatic duct leak. Drainages were performed using conventional endoscopy or endoscopic ultrasound. Transmural stents and/or drainage catheters were deployed and endoscopic necrosectomy was undertaken when required. Data on clinical outcomes and complications were collected prospectively.

RESULTS

A total of 211 patients underwent drainage of peripancreatic fluid collections that was classified as pseudocyst in 45%, abscess in 28%, and necrosis in 27%. Mean diameter of the fluid collection was 100.6 mm, and 34.5% of patients had pancreatic duct stent placement. Median duration of follow-up was 356 days. Treatment success was 85.3% and was higher for pseudocyst and abscess compared to necrosis (93.5% vs. 63.2%, p < 0.0001). Complications were encountered in 17 patients (8.5%) and was higher for drainage of necrosis than pseudocyst or abscess (15.8% vs. 5.2%, p = 0.02). Treatment success was more likely for patients with pseudocyst or abscess than necrosis (adjusted OR = 7.6, 95% CI [2.9, 20.1], p < 0.0001) when adjusted for serum albumin and white cell count, type of endoscopic modality or accessory used, pancreatic duct stenting, luminal compression, size and location of fluid collection.

CONCLUSIONS

Endoscopic therapy is a highly effective technique for the management of patients with non-necrotic peripancreatic fluid collections.

Soluble triggering receptor expressed on myeloid cells in severe acute pancreatitis: a biological marker of infected necrosis

PURPOSE

The diagnosis and treatment of secondary infection of pancreatic necrotic tissue remain a major challenge. The level of soluble triggering receptor expressed on myeloid cells (sTREM-1) in fine needle aspiration (FNA) fluid may be a good marker of infected necrosis.

METHODS

Patients with a clinical suspicion of secondary infection of necrotic tissue were enrolled. The serum levels of C-reactive protein, amylase, procalcitonin (PCT), and sTREM-1 and the fluid levels of sTREM-1, PCT, interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), and amylase were examined. When infected necrosis was defined, the first step was percutaneous or endoscopic drainage. If there was no improvement after 72 h, an open necrosectomy was performed.

RESULTS

In 30 patients with suspected infection, 18 patients were diagnosed as having secondary infection of necrotic tissue. The levels of sTREM-1 and PCT in FNA fluid were found to have the closest correlation with the diagnosis of infected necrosis [sTREM-1: area under the receiver operating characteristic curve (AUC) 0.972; 95% confidence interval (95%CI) 0.837-1.000; PCT: AUC 0.903; 95%CI 0.670-0.990, P > 0.05]. A fluid sTREM-1 cutoff value of 285.6 pg/ml had a sensitivity of 94.4% and a specificity of 91.7%. In a multiple logistic regression analysis, an sTREM-1 level of more than 285 pg/ml and a PCT level of more than 2.0 ng/ml in FNA fluid were independent predictors of infected necrosis.

CONCLUSIONS

The fluid level of sTREM-1 will help in the rapid and accurate diagnosis of secondary infection of necrotic tissue in patients with severe acute pancreatitis (SAP).

A conservative and minimally invasive approach to necrotizing pancreatitis improves outcome

BACKGROUND & AIMS

Treatment of patients with necrotizing pancreatitis has become more conservative and less invasive, but there are few data from prospective studies to support the efficacy of this change. We performed a prospective multicenter study of treatment outcomes among patients with necrotizing pancreatitis.

METHODS

We collected data from 639 consecutive patients with necrotizing pancreatitis, from 2004 to 2008, treated at 21 Dutch hospitals. Data were analyzed for disease severity, interventions (radiologic, endoscopic, surgical), and outcome.

RESULTS

Overall mortality was 15% (n=93). Organ failure occurred in 240 patients (38%), with 35% mortality. Treatment was conservative in 397 patients (62%), with 7% mortality. An intervention was performed in 242 patients (38%), with 27% mortality; this included early emergency laparotomy in 32 patients (5%), with 78% mortality. Patients with longer times between admission and intervention had lower mortality: 0 to 14 days, 56%; 14 to 29 days, 26%; and >29 days, 15% (P<.001). A total of 208 patients (33%) received interventions for infected necrosis, with 19% mortality. Catheter drainage was most often performed as the first intervention (63% of cases), without additional necrosectomy in 35% of patients. Primary catheter drainage had fewer complications than primary necrosectomy (42% vs 64%, P=.003). Patients with pancreatic parenchymal necrosis (n=324), compared with patients with only peripancreatic necrosis (n=315), had a higher risk of organ failure (50% vs 24%, P<.001) and mortality (20% vs 9%, P<.001).

CONCLUSIONS

Approximately 62% of patients with necrotizing pancreatitis can be treated without an intervention and with low mortality. In patients with infected necrosis, delayed intervention and catheter drainage as first treatment improves outcome.

Validation of the harmless acute pancreatitis score in predicting nonsevere course of acute pancreatitis

BACKGROUND

The Harmless Acute Pancreatitis Score (HAPS) is a scoring algorithm to identify patients with nonsevere acute pancreatitis. The aim of this study was to evaluate the reproducibility of HAPS outside its original study setting.

METHOD

Baseline information of all hospitalized patients with acute pancreatitis at Karolinska University Hospital, Stockholm, Sweden, between 2004 and 2009 was collected. The parameters constituting HAPS were signs of peritonitis, hematocrit and serum creatinine levels. Since hematocrit was not available in all patients, complete sample analysis was performed by replacing hematocrit with hemoglobin (strongly correlated with hematocrit; r = 0.86).

RESULTS

In total, 531 patients with a first-time or a recurrent attack of acute pancreatitis were included. Among 353 patients with complete information on parameters constituting HAPS, 79 patients were predicted to have a nonsevere course, of whom 1 patient developed severe acute pancreatitis. The specificity of HAPS in predicting a nonsevere course of acute pancreatitis was 96.3% (95% CI: 81.0-99.9) with a corresponding positive predictive value of 98.7% (95% CI: 93.1-100). Complete sample analysis replacing hematocrit with hemoglobin level predicted a nonsevere course in 182 patients, of whom 2 patients had severe acute pancreatitis (94.3% specificity and 98.9% positive predictive value).

CONCLUSION

HAPS is a highly specific scoring algorithm that predicts a nonsevere course of acute pancreatitis. Therefore, HAPS might be an additional tool in the clinical assessment of acute pancreatitis where early screening is important to treat the patients at an optimal level of care.

A comprehensive classification of invasive procedures for treating the local complications of acute pancreatitis based on visualization, route, and purpose

BACKGROUND/AIMS

The lack of a system to classify invasive procedures to treat local complications of acute pancreatitis is an obstacle to comparing interventions. This study aimed to develop and validate a comprehensive multidisciplinary classification.

METHODS

Standardized terminology was used to develop a classification of procedures based on three key components: how the lesion is visualized, the route used during the procedure, and the procedure's purpose. Gastroenterologists, radiologists, and surgeons (n = 22) from three New Zealand centers independently classified 15 published technique descriptions. Inter-rater reliability was calculated for each component. The classification's clarity, ease of use, and potential to achieve its objectives were rated on a Likert scale.

RESULTS

The classification's clarity, ease of use, and potential to achieve its objectives had median scores of 4/5. Inter-rater reliability for visualization, route, and purpose components was substantial at 0.73 (95% CI 0.63-0.82), 0.79 (95% CI 0.70-0.87), and 0.64 (95% CI 0.53-0.74), respectively.

CONCLUSIONS

This article describes the development and validation of a comprehensive classification for the wide range of procedures used to treat the local complications of acute pancreatitis. It has substantial inter-rater reliability and high acceptability, which should enhance communication between clinicians and facilitate comparison between procedures.

Expandable stents: unique devices and clinical uses

The use of stents throughout the gastrointestinal tract has evolved over the past century. The evolution of endoscopic ultrasound and significant improvements in stent design are key factors that have allowed endoscopists to drive the use of stents in gastroenterology into new directions. Endoscopic creativity remains crucial in the evolution of any new endoscopic technology. Finally, the use of multidisciplinary teams, including endoscopists, radiologists, and surgeons, allows for the exchange of ideas and procedural planning necessary for successful innovation.

Multiple transluminal gateway technique for EUS-guided drainage of symptomatic walled-off pancreatic necrosis

BACKGROUND

Walled-off pancreatic necrosis often leads to severe clinical deterioration necessitating open debridement or endoscopic necrosectomy. A new EUS-based approach was devised to manage this condition by creating multiple transluminal gateways to facilitate effective drainage of the necrotic contents.

OBJECTIVE

To compare treatment outcomes between patients with walled-off pancreatic necrosis managed endoscopically by a multiple transluminal gateway technique (MTGT) or a conventional drainage technique (CDT).

DESIGN

Retrospective study.

SETTING

Tertiary-care referral center.

PATIENTS

This study involved patients with severe acute pancreatitis complicated by walled-off pancreatic necrosis managed endoscopically.

INTERVENTION

In MTGT, 2 or 3 transmural tracts were created by using EUS guidance between the necrotic cavity and the GI lumen. While one tract was used to flush normal saline solution via a nasocystic catheter, multiple stents were deployed in others to facilitate drainage of necrotic contents. In the CDT, two stents with a nasocystic catheter were deployed via 1 transmural tract.

MAIN OUTCOME MEASUREMENTS

Resolution of symptoms, radiological findings on follow-up CT, and the need for subsequent surgery or endoscopic necrosectomy.

RESULTS

Of 60 patients with symptomatic walled-off pancreatic necrosis, 12 (3 women, mean age 55.1 years) were managed by MTGT and 48 (12 women, mean age 55.2 years) by CDT. Treatment was successful in 11 of 12 (91.7%) patients managed by MTGT versus 25 of 48 (52.1%) managed by CDT (P = .01). Although 1 patient in the MTGT cohort required endoscopic necrosectomy, in the CDT cohort, 17 required surgery, 3 underwent endoscopic necrosectomy, and 3 died of multiple-organ failure. Treatment success was more likely for patients treated by MTGT than by CDT (adjusted odds ratio = 9.24; 95% confidence interval, 1.08-79.02; P = .04) when we adjusted for the size of the walled-off pancreatic necrosis and pancreatic duct stent placement.

LIMITATIONS

Selective patient population.

CONCLUSION

The EUS-guided MTGT is an effective treatment option for the management of symptomatic walled-off pancreatic necrosis because it obviates the need for surgery and endoscopic necrosectomy and its attendant procedure-related morbidity. Prospective studies are required to confirm these preliminary but promising data.

Endoscopic necrosectomy of pancreatic necrosis: a systematic review

AIM

To review the current status of the novel technique of endoscopic necrosectomy in the management of pancreatic necrosis after acute pancreatitis.

METHODS

Studies were identified by searching Medline, PubMed and Embase databases for articles from January 1990 to December 2009 using the keywords "acute pancreatitis", "pancreatic necrosis" and "endoscopy". Additional papers were identified by a manual search of the references from the key articles. Case series of fewer than five patients and case reports were excluded.

RESULTS

Indications, techniques and outcomes of endoscopic necrosectomy were analysed. There were no randomised controlled trials identified. Ten case series were included in this analysis. There were a total of more than 1,100 endoscopic necrosectomy procedures in 260 patients with pancreatic necrosis. One hundred fifty-five were proven to be infected necrosis on culture. The overall mortality rate was 5%. The mean procedure-related morbidity rate was 27%. The rate of complete resolution of pancreatic necrosis with the endoscopic method alone was 76%.

CONCLUSIONS

Endoscopic necrosectomy is a safe and effective treatment option in selected patients with pancreatic necrosis after acute pancreatitis. Future studies will be required to further define the selection criteria and the techniques for the endoscopic procedure.

Step-up approach to infected necrotising pancreatitis: a 20-year experience of percutaneous drainage in a single centre

AIM

To evaluate the efficacy of step-up approach to infected necrotising pancreatitis.

METHODS

Retrospective analysis of 86 patients treated by step-up approach from 1989 to 2009. Infection was confirmed by examination of aspirated material or by presence of free pancreatic gas at contrast-enhanced computed tomography. Conservative treatment was initially attempted in all patients; percutaneous catheter drainage was performed when conservative therapy failed; surgery was planned only if no clinical improvement was observed. Primary outcome was mortality.

RESULTS

Fifteen patients (17.4%) were successfully treated with conservative treatment only. Percutaneous catheter drainage was performed in 69 (80.2%). Eight patients (9.3%) died, two at week 1 without drainage or surgery and six after percutaneous catheter drainage and surgery. Eleven patients were converted to surgery (12.8%). Organ failure occurred in 59/86 (68.6%) and multiorgan failure in 25/86 (29.1%). Median (interquartile ranges) hospital stay and catheter dwell times were 13 (9-47) and 15 (7-34) days, respectively. There were 2.61 catheter problems and 1.68 catheter changes per patient.

CONCLUSIONS

The step-up approach is an effective and safe strategy for the treatment of infected necrotising pancreatitis. Percutaneous drainage can avert the need for surgery in the majority of patients.

[Pancreatic necrosis: pro-endoscopic therapy]

The transmural endoscopic debridement and other minimally invasive therapies of infected postpancreatic necroses have been developed over the last decade as alternatives to open surgery. In several clinical centers the endoscopic approach has become standard therapy. The mortality rate in published series is in the range 0-15% and additional surgery is needed in 0-40%.Out of 73 own patients treated endoscopically between 2006 and 2010, 4 were operated because of bleeding, 2 with an acute abdomen and 3 with sepsis. Of the patients 6 died because of multi-organ failure and in 3 cases despite surgery. Main complications such as bleeding (n=20) and acute abdomen (n=7) were mostly treated conservatively. There was no procedure-related mortality. The endoscopic therapy was successful in 59 patients (80%) of whom 7 required further transmural endoscopic interventions for cystic relapses.At present, finding the best combination of endoscopic-transmural, percutaneous, laparoscopic and sometimes finally open surgical therapy remains an interdisciplinary challenge. The only randomized study published in this context clearly indicates that such a step-up approach is the most favorable.

Open transgastric debridement and internal drainage of symptomatic non-infected walled-off pancreatic necrosis

BACKGROUND

The best treatment options for walled-off pancreatic necrosis (WOPN) are not well defined. A retrospective study of patients treated for WOPN with transgastric debridement and internal drainage was undertaken.

METHODS

Patients with symptomatic non-infected WOPN treated with open transgastric debridement and internal drainage were evaluated.

RESULTS

In all, 51 patients underwent surgical management of necrotizing pancreatitis during the study period. Ten patients (19%) were treated with open transgastric debridement and internal drainage for symptomatic non-infected WOPN. The median patient age was 40 years, the most common aetiology for pancreatitis was biliary, the mean American Society of Anesthesiologists (ASA) score was 2 and the delay to surgery was 100 days. The operating time was 118 min, with a blood loss of 50cc. One patient required reoperation, three patients had morbidity and there were no mortalities. The only factor associated with post-operative morbidity was the presence of positive cultures (P < 0.05). The length of stay (LOS) after surgery was 8 days, at a median follow-up of 18 months, one patient had late complications related to the surgery and the procedure was successful in 90% of the patients.

DISCUSSION

Open transgastric debridement with internal drainage of WOPN is safe and efficacious. Patients were clinically stable (no organ failure) and had a long delay in surgical intervention (100 days). In this select group of patients, the success, morbidity and mortality is similar to all reported minimally invasive techniques.

Direct endoscopic necrosectomy for the treatment of walled-off pancreatic necrosis: results from a multicenter U.S. series

BACKGROUND

Direct endoscopic necrosectomy (DEN) for treatment of walled-off pancreatic necrosis (WOPN) has been performed as an alternative to operative or percutaneous therapy.

OBJECTIVE

To report the largest combined experience of DEN performed for WOPN.

DESIGN

Retrospective chart review.

SETTING

Six U.S. tertiary medical centers.

PATIENTS

A total of 104 patients with a history of acute pancreatitis and symptomatic WOPN since 2003.

INTERVENTIONS

DEN for WOPN.

MAIN OUTCOME MEASUREMENTS

Resolution or near-resolution of WOPN without the need for surgical or percutaneous intervention and procedural complications.

RESULTS

Successful resolution was achieved in 95 of 104 patients (91%). Of the patients in whom it failed, 5 died during follow-up before resolution, 2 underwent operative drainage for persistent WOPN, 1 required surgery for massive bleeding on fistula tract dilation, and 1 died periprocedurally. The mean time to resolution from the initial DEN was 4.1 months. The first débridement was performed a mean of 63 days after the initial onset of acute pancreatitis. In 73%, the entry was transgastric with median tract dilation diameter of 18 mm. The median number of procedures was 3 with 2 débridements. Complications occurred in approximately 14% and included 5 retrogastric perforations/pneumoperitoneum, which were managed nonoperatively. Univariate analysis identified a body mass index >32 as a risk factor for failed DEN.

LIMITATIONS

Retrospective, highly specialized centers.

CONCLUSIONS

This large, multicenter series demonstrates that transmural, minimally invasive endoscopic débridement of WOPN performed in the United States is an efficacious and reproducible technique with an acceptable safety profile.

Critical care issues in managing complex open abdominal wound

Over the past 30 years, surgical specialties have introduced and expanded the role of open abdominal management in complicated operative cases, necessitating an intensivist's understanding of the indications and unique intensive care unit (ICU) issues related to the open abdomen. When presented with the open abdomen, resuscitation to correct shock is of primary concern. This is accomplished by correction of hypothermia, acidosis, and coagulopathy in trauma and adequate resolution of intra-abdominal hypertension or source control in general surgery. These patients typically require deep sedation and often paralysis and benefit from low-volume ventilatory strategies to prevent and treat acute lung injury. Antibiotics must be tailored to the clinical situation, but in most cases, 24 hours of perioperative treatment is all that is required. In cases of gross contamination and peritonitis, a 5- to 7-day course of broad-spectrum antibiotics may be of benefit.Adequate source control has been demonstrated to have the greatest impact on outcome and when the patient's clinical milieu dictates, bedside washouts. Enteral nutrition should be instituted as early as possible after intestinal continuity has been reestablished. Additional protein is required to account for losses from the open abdomen. Reconstruction may require staging, but in general, should proceed following resolution of shock and control of sepsis. Elevated multiorgan dysfunction score, Acute Physiology And Chronic Health Evaluation II (APACHE II), and a rise in peak inspiratory pressure portend poor source control and could result in failure of fascial closure. If unable to proceed to fascial closure, then considerations should be made for planned ventral hernia and subsequent abdominal wall reconstruction.

Pancreatitis, very early compared with normal start of enteral feeding (PYTHON trial): design and rationale of a randomised controlled multicenter trial

BACKGROUND

In predicted severe acute pancreatitis, infections have a negative effect on clinical outcome. A start of enteral nutrition (EN) within 24 hours of onset may reduce the number of infections as compared to the current practice of starting an oral diet and EN if necessary at 3-4 days after admission.

METHODS/DESIGN

The PYTHON trial is a randomised controlled, parallel-group, superiority multicenter trial. Patients with predicted severe acute pancreatitis (Imrie-score ≥ 3 or APACHE-II score ≥ 8 or CRP > 150 mg/L) will be randomised to EN within 24 hours or an oral diet and EN if necessary, after 72 hours after hospital admission.During a 3-year period, 208 patients will be enrolled from 20 hospitals of the Dutch Pancreatitis Study Group. The primary endpoint is a composite of mortality or infections (bacteraemia, infected pancreatic or peripancreatic necrosis, pneumonia) during hospital stay or within 6 months following randomisation. Secondary endpoints include other major morbidity (e.g. new onset organ failure, need for intervention), intolerance of enteral feeding and total costs from a societal perspective.

DISCUSSION

The PYTHON trial is designed to show that a very early (< 24 h) start of EN reduces the combined endpoint of mortality or infections as compared to the current practice of an oral diet and EN if necessary at around 72 hours after admission for predicted severe acute pancreatitis.

TRIAL REGISTRATION

ISRCTN: ISRCTN18170985.

A comparison of the hospital costs of open vs. minimally invasive surgical management of necrotizing pancreatitis

BACKGROUND

Infected necrotizing pancreatitis is a major burden for both the patient and the health care system. Little is known about how hospital costs break down and how they may have shifted with the increasing use of minimally invasive techniques. The aim of this study was to analyse inpatient hospital costs associated with pancreatic necrosectomy.

METHODS

A prospective database was used to identify all patients who underwent an intervention for necrotizing pancreatitis. Costs of treatment were calculated using detailed information from the Decision Support Department. Costs for open and minimally invasive surgical modalities were compared.

RESULTS

Twelve open and 13 minimally invasive necrosectomies were performed in a cohort of 577 patients presenting over a 50-month period. One patient in each group died in hospital. Overall median stay was 3.8 days in the intensive care unit (ICU) and 44 days on the ward. The median overall treatment cost was US$ 56,674. The median largest contributors to this total were ward (26.3%), surgical personnel (22.3%) and ICU (17.0%) costs. These did not differ statistically between the two treatment modalities.

CONCLUSIONS

Pancreatic necrosectomy uses considerable health care resources. Minimally invasive techniques have not been shown to reduce costs. Any intervention that can reduce the length of hospital and, in particular, ICU stay by reducing the incidence of organ failure or by preventing secondary infection is likely to be cost-effective.

[Severe and acute pancreatitis admitted in intensive care: a prospective epidemiological multiple centre study using CClin network database]

OBJECTIVES

To describe the demographic characteristics, incidence of extra-abdominal hospital-acquired infections and outcome of patients admitted to intensive care unit (ICU) with severe acute pancreatitis.

STUDY DESIGN

A retrospective, observational multiple center (65 centers) analysis of prospectively acquired data.

PATIENTS AND METHODS

During 2 years, all consecutive admitted patients to ICU for severe acute pancreatitis in the centers participating in the nosocomial infections surveillance network CClin Sud-Est were included. Patients whose ICU stay was less than 48 hours were not included. Demographic characteristics, extra-abdominal hospital-acquired infections and clinical course were described.

RESULTS

During the study period, 510 patients were included which represented 2 % of patients with a length of stay longer than 48 hours in the 65 participating ICUs. The global attack rate of extra-abdominal hospital-acquired infections (pneumonia, bacteremia, urinary tract or central venous catheter infection) was 23 % in overall patients and it was 33 % in the 294 mechanically ventilated patients. ICU mortality was 20 % in overall patients and it was 34 % in mechanically ventilated patients.

CONCLUSION

Severe acute pancreatitis represents 2 % of ICU stay longer than 48 hours. Its clinical course is frequently complicated by hospital-acquired infections and is associated with an high ICU mortality rate. This epidemiological observational study may be used for calculating sample size for future multicenter interventional therapeutic studies.

Systematic review of percutaneous catheter drainage as primary treatment for necrotizing pancreatitis

BACKGROUND

The role of percutaneous catheter drainage (PCD) in patients with (infected) necrotizing pancreatitis was evaluated.

METHODS

A systematic literature search was performed. Inclusion criteria were: consecutive cohort of patients with necrotizing pancreatitis undergoing PCD as primary treatment for peripancreatic collections; indication for PCD either (suspected) infected necrosis or symptomatic sterile pancreatic necrosis; and outcomes reported to include percentage of infected peripancreatic collections, need for additional surgical necrosectomy, complications and deaths. Exclusion criteria were: cohort of fewer than five patients; cohort included patients with chronic pancreatitis; selected subgroup of patients with acute pancreatitis studied, such as those with pseudocysts, pancreatic abscesses and/or exclusively sterile pancreatic necrosis; and cohort in which PCD was combined with another minimally invasive strategy and results for PCD alone not reported separately.

RESULTS

Eleven studies, including 384 patients, fulfilled the inclusion criteria. Only one study was a randomized controlled trial; most others were retrospective case series. Four studies reported on the presence of organ failure before PCD; this occurred in 67·2 per cent of 116 patients. Infected necrosis was proven in 271 (70·6 per cent) of 384 patients. No additional surgical necrosectomy was required after PCD in 214 (55·7 per cent) of 384 patients. Complications consisted mostly of internal and external pancreatic fistulas. The overall mortality rate was 17·4 per cent (67 of 384 patients). Nine of 11 studies reported mortality separately for patients with infected necrosis undergoing PCD; the mortality rate in this group was 15·4 per cent (27 of 175).

CONCLUSION

A considerable number of patients can be treated with PCD without the need for surgical necrosectomy.

Analysis of the delayed approach to the management of infected pancreatic necrosis

AIM: To analyze outcomes of delayed single-stage necrosectomy after early conservative management of patients with infected pancreatic necrosis (IPN) associated with severe acute pancreatitis (SAP).

METHODS: Between January 1998 and December 2009, data from patients with SAP who developed IPN and were managed by pancreatic necrosectomy were analyzed.

RESULTS: Fifty-nine of 61 pancreatic necrosectomies were performed by open surgery and 2 laparoscopically. In 55 patients, single-stage necrosectomy could be performed (90.2%). Patients underwent surgery at a median of 29 d (range 13-46 d) after diagnosis of acute pancreatitis. Sepsis and multiple organ failure accounted for the 9.8% mortality rate. Pancreatic fistulae (50.8%) predominantly accounted for the morbidity. The median hospital stay was 23 d, and the median interval for return to regular activities was 110 d.

CONCLUSION: This series supports the concept of delayed single-stage open pancreatic necrosectomy for IPN. Advances in critical care, antibiotics and interventional radiology have played complementary role in improving the outcomes.

Progress in the management of necrotizing pancreatitis

Pancreatic necrosis, a complication of severe pancreatitis, may become infected, resulting in significant morbidity and potential mortality. Infected necrosis was heretofore considered a surgical condition, and despite aggressive operative management, the mortality remained high. With a better understanding of the natural history of necrosis, established methods to diagnose infection and the increasing use of minimally invasive techniques, less aggressive therapies have been utilized with some success. The present study evaluated a step-up approach for the treatment of infected pancreatic necrosis, utilizing endoscopic and percutaneous techniques, and if ineffective, necrosectomy with a minimally invasive retroperitoneal approach. They compared this step-up approach to the standard open necrosectomy. They demonstrated that when using such an approach compared with open necrosectomy, the frequency of major complications such as organ failure, perforation, fistula or even death was significantly less than in those who received conventional open necrosectomy. Indeed, for those randomized to the step-up approach, roughly a third of the patients were successfully treated with percutaneous drainage alone. In the long-term, development of diabetes was also less frequent in those receiving less aggressive therapy. These findings, in combination with other reports, suggest that the dogma that open necrosectomy is mandatory for all patients with infected necrosis should be re-evaluated, and that less aggressive treatments as part of a multidisciplinary approach can reduce morbidity and mortality.

Endoscopic and percutaneous drainage of symptomatic walled-off pancreatic necrosis reduces hospital stay and radiographic resources

BACKGROUND & AIMS

Walled-off pancreatic necrosis (WOPN), a complication of severe acute pancreatitis (SAP), can become infected, obstruct adjacent structures, and result in clinical deterioration of patients. Patients with WOPN have prolonged hospitalizations, needing multiple radiologic and medical interventions. We compared an established treatment of WOPN, standard percutaneous drainage (SPD), with combined modality therapy (CMT), in which endoscopic transenteric stents were added to a regimen of percutaneous drains.

METHODS

Symptomatic patients with WOPN between January 2006 and August 2009 were treated with SPD (n = 43, 28 male) or CMT (n = 23, 17 male) and compared by disease severity, length of hospitalization, duration of drainage, complications, and number of radiologic and endoscopic procedures.

RESULTS

Patient age (59 vs 54 years), sex (77% vs 58% male), computed tomography severity index (8.0 vs 7.2), number of endoscopic retrograde cholangiopancreatographies (2.0 vs 2.6), and percentage with disconnected pancreatic ducts (50% vs 46%) were equivalent in the CMT and SPD arms, respectively. Patients undergoing CMT had significantly decreased length of hospitalization (26 vs 55 days, P < .0026), duration of external drainage (83.9 vs 189 days, P < .002), number of computed tomography scans (8.95 vs 14.3, P < .002), and drain studies (6.5 vs 13, P < .0001). Patients in the SPD arm had more complications.

CONCLUSIONS

For patients with symptomatic WOPN, CMT provided a more effective and safer management technique, resulting in shorter hospitalizations and fewer radiologic procedures than SPD.