Postoperative Pancreatic Fistula Following Pancreaticoduodenectomy-Stratification of Patient Risk

Preoperative prediction of postoperative pancreatic fistula after Pancreaticoduodenectomy: Determination and validation of a cut-off value for the Roberts Score

BACKGROUND

POPF after pancreaticoduodenectomy can be life-threatening. For risk stratification, prediction could be key. The aim of this study is to determine and validate a cut-off value for the Roberts Score, which is one of the few purely preoperative multicenter validated predictive models for POPF.

METHODS

582 patients were included. The Youden index determined a cut-off in the exploratory cohort (n ​= ​466). The validation cohort's (n ​= ​116) ability to predict CR-POPF was tested using univariate and multivariate regression analysis.

RESULTS

AUC of Roberts Score for the exploration cohort was 0.768. The identified cut-off of 0.268 was confirmed in the validation cohort (p ​< ​0.001). Higher scores were significantly associated with longer time to drain removal and ICU stay. Multiple logistic regression showed the cut-off as an independent predictor of CR-POPF (p ​= ​0.038).

CONCLUSION

The scoring variables and the cut-off itself were both independent predictors, which may improve the identification of high-risk patients and help to investigate the development of POPF.

Risk factors for surgical site infections following hepatobiliary surgery: An umbrella review and meta-analyses

BACKGROUND

In the hepatobiliary (HPB) surgical cohort, surgical site infections (SSI) can extend hospital stays, result in higher morbidity, and poor patient outcomes. This umbrella review and meta-analysis aimed to synthesise the evidence for the association between clinical and patient risk factors and SSI in patients following HPB surgery.

METHODS

We searched MEDLINE, CINAHL, EMBASE and Scopus from January 2000 to April 2023 to identify systematic reviews and meta-analyses where patient and/or clinical factors of SSIs following HPB surgery were reported. The summary effect size, its 95 % CI and the 95 % PI were calculated for each meta-analysis using random-effects models. 30-day cumulative SSI incidence was presented as the pooled estimate with 95 % CIs. Between-study heterogeneity was explored using the I2 statistic.

RESULTS

Nine systematic reviews and meta-analyses were included. Our findings suggest open surgical approach, type of pancreas procedure, preoperative biliary drainage, older age, male sex and high BMI (>25mg/k2) as statistically significant factors for increasing a patient's risk of SSI following HPB surgery. The cumulative incidence of SSI in the HPB cohort of 43,296 was 11 % (95 % CI 6%-20 %), with substantial variation between the reviews.

CONCLUSION

We identified several patient and clinical factors, however only one was graded as a high level of evidence.

A ligamentum teres hepatis and falciform ligament 'belt and braces' approach in laparoscopic pancreaticoduodenectomy using a modified Blumgart anastomosis to minimize severe pancreatic fistula and post-operative complications

BACKGROUND

To determine whether ligamentum teres hepatis and falciform ligament, wrapped around the gastroduodenal artery (GDA) and reinforced the posterior wall in pancreatojejunostomy (PJ), protects the GDA stump and other skeletal blood vessels from erosive hemorrhage and reduces the incidence of clinically relevant post-operative pancreatic fistula (CR-POPF) and post-operative complications after laparoscopic pancreaticoduodenectomy (LPD).

METHODS

We reviewed patients undergone LPD between January 2019 and June 2023. Patients were divided into two groups according to whether the ligamentous flap had been used to wrap the GDA stump (Group A) or to reinforce the posterior wall in PJ, together with the GDA wrapping procedure (Group B). Peri-operative data were reviewed to determine the effectiveness of this approach in preventing CR-POPF, post-pancreatectomy hemorrhage (PPH), and other complications.

RESULTS

We enrolled 272 patients (Group A, 154 patients; Group B, 118 patients). Group B patients had significantly fewer ≥ Grade II Clavien-Dindo classification morbidities and CR-POPFs (P < 0.05), and lower length of hospital stay (LOS) and abdominal drainage tube insertion times. Risk factor analysis indicated that main pancreatic duct dilation, the PJ reinforcement procedure, and soft pancreatic tissue were associated with ≥Grade II Clavien-Dindo morbidities and CR-POPF complications.

CONCLUSIONS

The ligamentous flap application in LPD provided shelter to GDA stump and other skeletal blood vessels under PJ from erosive digestive juices, reinforced the posterior wall in PJ, reduced the incidence of CR-POPF and ≥Grade II Clavien-Dindo classification morbidities. This simple procedure is effective for improving surgical safety of LPD.

Association of preoperative cholangitis with outcomes and expenditures among patients undergoing pancreaticoduodenectomy

BACKGROUND

This study aimed to characterize the association of preoperative acute cholangitis (PAC) with surgical outcomes and healthcare costs.

METHODS

Patients who underwent pancreaticoduodenectomy (PD) between 2013 and 2021 were identified using 100% Medicare Standard Analytic Files. PAC was defined as the occurrence of at least 1 episode of acute cholangitis within the year preceding surgery. Multivariable regression analyses were used to compare postoperative outcomes and costs relative to PAC.

RESULTS

Among 23,455 Medicare beneficiaries who underwent PD, 2,217 patients (9.5%) had at least 1 episode of PAC. Most patients (n = 14,729 [62.8%]) underwent PD for a malignant indication. On multivariable analyses, PAC was associated with elevated odds of surgical site infection (odds ratio [OR], 1.14; 95% CI, 1.01-1.29), sepsis (OR, 1.17; 95% CI, 1.01-1.37), extended length of stay (OR, 1.13; 95% CI, 1.01-1.26), and readmission within 90 days (OR, 1.14; 95% CI, 1.04-1.26). Patients with a history of PAC before PD had a reduced likelihood of achieving a postoperative textbook outcome (OR, 0.83; 95% CI, 0.75-0.92) along with 87.8% and 18.4% higher associated preoperative and postoperative healthcare costs, respectively (all P < .001). Overall costs increased substantially among patients with more than 1 PAC episode ($59,893 [95% CI, $57,827-$61,959] for no episode vs $77,922 [95% CI, $73,854-$81,990] for 1 episode vs $101,205 [95% CI, $94,871-$107,539] for multiple episodes).

CONCLUSION

Approximately 1 in 10 patients undergoing PD experienced an antecedent PAC episode, which was associated with adverse surgical outcomes and greater healthcare expenditures.

Association of preoperative CT-scan features and clinically relevant postoperative pancreatic fistula after pancreaticoduodenectomy: a meta-analysis

BACKGROUND

Clinically relevant postoperative pancreatic fistula (CR-POPF) is a significant complication after pancreaticoduodenectomy. CR-POPF is associated with various adverse outcomes, including high mortality rates. Identifying complication predictors for CR-POPF, such as preoperative CT scan features, including pancreatic attenuation index (PAI) and pancreatic duct diameter (PDD), is critical. This systematic review and meta-analysis consolidate existing literature to assess the impact of these variables on CR-POPF risk.

METHODS

Our comprehensive search, conducted in May 2023, covered PubMed, Scopus, Embase, and Web of Science databases. Inclusion criteria encompassed peer-reviewed cohort studies on pancreaticoduodenectomy, focusing on preoperative CT scan data. Case reports, case series, and studies reporting distal pancreatectomy were excluded. The quality assessment of included articles was done using New-Castle Ottawa Scale for cohort studies. Statistical analysis was carried out using Review Manager 5. This study was registered at the International Prospective Register of Systematic Reviews database (PROSPERO) on 12 May 2023 (registration number: CRD42023414139).

RESULTS

We conducted a detailed analysis of 38 studies with 7393 participants. The overall incidence of CR-POPF was 24%. Multiple linear regression analyses revealed that PDD and pancreatic parenchymal thickness were significantly associated with CR-POPF.

CONCLUSION

Our systematic review and meta-analysis shed light on CT scan findings for predicting CR-POPF after Whipple surgery. Age, PDD, and pancreatic parenchymal thickness significantly correlate with CR-POPF.

Predictive Factors for Delayed Gastric Emptying After Pancreatoduodenectomy: A Swedish National Registry-Based Study

BACKGROUND

Delayed gastric emptying (DGE) is a common complication after pancreatoduodenectomy (PD). DGE causes prolonged hospital stay and a decrease in quality of life. This study analyzes predictive factors for development of DGE after PD, also in the absence of surgical complications.

METHOD

Data from the Swedish National Pancreatic Cancer Registry for patients undergoing standard and pylorus preserving open PD from January 2010 until June 30, 2018, were collected. Data were analyzed in two groups, no DGE and DGE. A subgroup of patients with DGE but without surgical complications was compared to patients without DGE or any other surgical complication.

RESULTS

In total, 2503 patients were included, of which 470 (19%) had DGE. In the DGE group, 238 had other coexisting surgical complications and 232 had not. Postoperative pancreatic fistula (OR = 4.22, p < 0.001), surgical infection (OR = 1.44, p = 0.013), heart disease (OR = 1.32, p = 0.023) and medical complications (OR = 1.35, p = 0.025) increased the risk for DGE. A standard PD compared with pylorus preserving resection (OR = 1.69, p = 0.001) and a reconstruction with a pancreaticojejunostomy compared with a pancreaticogastrostomy (OR = 1.83, p < 0.001) increased the risk. For patients without surgical complications, a standard PD and reconstruction with pancreaticojejunostomy still increased the risk for DGE.

CONCLUSION

DGE is more common after standard PD compared to pylorus preserving PD and after reconstruction with PJ compared to PG in this national cohort, both in the presence of other surgical complications as well as in the absence of other complications.

A Transparent Reporting of a multivariable prediction model for Individual Prognosis Or Diagnosis analysis to evaluate the quality of reporting of postoperative pancreatic fistula prediction models after pancreatoduodenectomy: A systematic review

BACKGROUND

Postoperative pancreatic fistula is a frequent and potentially lethal complication after pancreatoduodenectomy. Several models have been developed to predict postoperative pancreatic fistula risk. This study was performed to evaluate the quality of reporting of postoperative pancreatic fistula prediction models after pancreatoduodenectomy using the Transparent Reporting of a multivariable prediction model for Individual Prognosis Or Diagnosis (TRIPOD) checklist that provides guidelines on reporting prediction models to enhance transparency and to help in the decision-making regarding the implementation of the appropriate risk models into clinical practice.

METHODS

Studies that described prediction models to predict postoperative pancreatic fistula after pancreatoduodenectomy were searched according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. The TRIPOD checklist was used to evaluate the adherence rate. The area under the curve and other performance measures were extracted if reported. A quadrant matrix chart is created to plot the area under the curve against TRIPOD adherence rate to find models with a combination of above-average TRIPOD adherence and area under the curve.

RESULTS

In total, 52 predictive models were included (23 development, 15 external validation, 4 incremental value, and 10 development and external validation). No risk model achieved 100% adherence to the TRIPOD. The mean adherence rate was 65%. Most authors failed to report on missing data and actions to blind assessment of predictors. Thirteen models had an above-average performance for TRIPOD checklist adherence and area under the curve.

CONCLUSION

Although the average TRIPOD adherence rate for postoperative pancreatic fistula models after pancreatoduodenectomy was 65%, higher compared to other published models, it does not meet TRIPOD standards for transparency. This study identified 13 models that performed above average in TRIPOD adherence and area under the curve, which could be the appropriate models to be used in clinical practice.

Fibrin sealants for the prevention of postoperative pancreatic fistula following pancreatic surgery

BACKGROUND

Postoperative pancreatic fistula (POPF) is one of the most frequent and potentially life-threatening complications following pancreatic surgery. Fibrin sealants have been used in some centres to reduce POPF rate. However, the use of fibrin sealant during pancreatic surgery is controversial. This is an update of a Cochrane Review last published in 2020.

OBJECTIVES

To evaluate the benefits and harms of fibrin sealant use for the prevention of POPF (grade B or C) in people undergoing pancreatic surgery compared to no fibrin sealant use.

SEARCH METHODS

We searched CENTRAL, MEDLINE, Embase, two other databases, and five trials registers on 09 March 2023, together with reference checking, citation searching, and contacting study authors to identify additional studies.

SELECTION CRITERIA

We included all randomised controlled trials (RCTs) that compared fibrin sealant (fibrin glue or fibrin sealant patch) versus control (no fibrin sealant or placebo) in people undergoing pancreatic surgery.

DATA COLLECTION AND ANALYSIS

We used standard methodological procedures expected by Cochrane.

MAIN RESULTS

We included 14 RCTs, randomising 1989 participants, comparing fibrin sealant use versus no fibrin sealant use for different locations: stump closure reinforcement (eight trials), pancreatic anastomosis reinforcement (five trials), or main pancreatic duct occlusion (two trials). Six RCTs were carried out in single centres; two in dual centres; and six in multiple centres. One RCT was conducted in Australia; one in Austria; two in France; three in Italy; one in Japan; two in the Netherlands; two in South Korea; and two in the USA. The mean age of the participants ranged from 50.0 years to 66.5 years. All RCTs were at high risk of bias. Application of fibrin sealants to pancreatic stump closure reinforcement after distal pancreatectomy We included eight RCTs involving 1119 participants: 559 were randomised to the fibrin sealant group and 560 to the control group after distal pancreatectomy. Fibrin sealant use may result in little to no difference in the rate of POPF (risk ratio (RR) 0.94, 95% confidence interval (CI) 0.73 to 1.21; 5 studies, 1002 participants; low-certainty evidence) and overall postoperative morbidity (RR 1.20, 95% CI 0.98 to 1.48; 4 studies, 893 participants; low-certainty evidence). After fibrin sealant use, approximately 199 people (155 to 256 people) out of 1000 developed POPF compared with 212 people out of 1000 when no fibrin sealant was used. The evidence is very uncertain about the effect of fibrin sealant use on postoperative mortality (Peto odds ratio (OR) 0.39, 95% CI 0.12 to 1.29; 7 studies, 1051 participants; very low-certainty evidence) and total length of hospital stay (mean difference (MD) 0.99 days, 95% CI -1.83 to 3.82; 2 studies, 371 participants; very low-certainty evidence). Fibrin sealant use may reduce the reoperation rate slightly (RR 0.40, 95% CI 0.18 to 0.90; 3 studies, 623 participants; low-certainty evidence). Serious adverse events were reported in five studies (732 participants), and there were no serious adverse events related to fibrin sealant use (low-certainty evidence). The studies did not report quality of life or cost-effectiveness. Application of fibrin sealants to pancreatic anastomosis reinforcement after pancreaticoduodenectomy We included five RCTs involving 519 participants: 248 were randomised to the fibrin sealant group and 271 to the control group after pancreaticoduodenectomy. The evidence is very uncertain about the effect of fibrin sealant use on the rate of POPF (RR 1.34, 95% CI 0.72 to 2.48; 3 studies, 323 participants; very low-certainty evidence), postoperative mortality (Peto OR 0.24, 95% CI 0.05 to 1.06; 5 studies, 517 participants; very low-certainty evidence), reoperation rate (RR 0.74, 95% CI 0.33 to 1.66; 3 studies, 323 participants; very low-certainty evidence), and total hospital cost (MD -1489.00 US dollars, 95% CI -3256.08 to 278.08; 1 study, 124 participants; very low-certainty evidence). After fibrin sealant use, approximately 130 people (70 to 240 people) out of 1000 developed POPF compared with 97 people out of 1000 when no fibrin sealant was used. Fibrin sealant use may result in little to no difference both in overall postoperative morbidity (RR 1.02, 95% CI 0.87 to 1.19; 4 studies, 447 participants; low-certainty evidence) and in total length of hospital stay (MD -0.33 days, 95% CI -2.30 to 1.63; 4 studies, 447 participants; low-certainty evidence). Serious adverse events were reported in two studies (194 participants), and there were no serious adverse events related to fibrin sealant use (very low-certainty evidence). The studies did not report quality of life. Application of fibrin sealants to pancreatic duct occlusion after pancreaticoduodenectomy We included two RCTs involving 351 participants: 188 were randomised to the fibrin sealant group and 163 to the control group after pancreaticoduodenectomy. The evidence is very uncertain about the effect of fibrin sealant use on postoperative mortality (Peto OR 1.41, 95% CI 0.63 to 3.13; 2 studies, 351 participants; very low-certainty evidence), overall postoperative morbidity (RR 1.16, 95% CI 0.67 to 2.02; 2 studies, 351 participants; very low-certainty evidence), and reoperation rate (RR 0.85, 95% CI 0.52 to 1.41; 2 studies, 351 participants; very low-certainty evidence). Fibrin sealant use may result in little to no difference in the total length of hospital stay (median 16 to 17 days versus 17 days; 2 studies, 351 participants; low-certainty evidence). Serious adverse events were reported in one study (169 participants; low-certainty evidence): more participants developed diabetes mellitus when fibrin sealants were applied to pancreatic duct occlusion, both at three months' follow-up (33.7% fibrin sealant group versus 10.8% control group; 29 participants versus 9 participants) and 12 months' follow-up (33.7% fibrin sealant group versus 14.5% control group; 29 participants versus 12 participants). The studies did not report POPF, quality of life, or cost-effectiveness.

AUTHORS' CONCLUSIONS

Based on the current available evidence, fibrin sealant use may result in little to no difference in the rate of POPF in people undergoing distal pancreatectomy. The evidence is very uncertain about the effect of fibrin sealant use on the rate of POPF in people undergoing pancreaticoduodenectomy. The effect of fibrin sealant use on postoperative mortality is uncertain in people undergoing either distal pancreatectomy or pancreaticoduodenectomy.

A Simple Classification of Pancreatic Duct Size and Texture Predicts Postoperative Pancreatic Fistula: A classification of the International Study Group of Pancreatic Surgery

OBJECTIVE

The aim of this study was to develop a classification system for pancreas-associated risk factors in pancreatoduodenectomy (PD).

SUMMARY BACKGROUND DATA

Postoperative pancreatic fistula (POPF) is the most relevant PD-associated complication. A simple standardized surgical reporting system based on pancreas-associated risk factors is lacking.

METHODS

A systematic literature search was conducted to identify studies investigating clinically relevant (CR) POPF (CR-POPF) and pancreas-associated risk factors after PD. A meta-analysis of CR-POPF rate for texture of the pancreas (soft vs not-soft) and main pancreatic duct (MPD) diameter was performed using the Mantel-Haenszel method. Based on the results, the International Study Group of Pancreatic Surgery (ISGPS) proposes the following classification: A, not-soft (hard) texture and MPD >3 mm; B, not-soft (hard) texture and MPD ≤3 mm; C, soft texture and MPD >3 mm; D, soft texture and MPD ≤3 mm. The classification was evaluated in a multi-institutional, international cohort.

RESULTS

Of the 2917 articles identified, 108 studies were included in the analyses. Soft pancreatic texture was significantly associated with the development of CR-POPF [odds ratio (OR) 4.24, 95% confidence interval (CI) 3.67-4.89, P < 0.01) following PD. Similarly, MPD diameter ≤3 mm significantly increased CR-POPF risk compared with >3 mm diameter MPDs (OR 3.66, 95% CI 2.62-5.12, P < 0.01). The proposed 4-stage system was confirmed in an independent cohort of 5533 patients with CR-POPF rates of 3.5%, 6.2%, 16.6%, and 23.2% for type A-D, respectively ( P < 0.001).

CONCLUSION

For future pancreatic surgical outcomes studies, the ISGPS recommends reporting these risk factors according to the proposed classification system for better comparability of results.

Predicting early discharge and readmission following pancreaticoduodenectomy [S079]

INTRODUCTION

Implementing enhanced recovery after surgery (ERAS) protocols for major abdominal surgery has been shown to decrease length of stay (LOS) and postoperative complications, including mortality and readmission. Little is known to guide which patients undergoing pancreaticoduodenectomy (PD) should be eligible for ERAS protocols.

METHODS AND PROCEDURES

A retrospective chart review of all PD performed from 2010 to 2018 within an integrated healthcare system was conducted. A predictive score that ranges from 0 to 4 was developed, with one point assigned to each of the following: obesity (BMI > 30), operating time > 400 min, estimated blood loss (EBL) > 400 mL, low- or high-risk pancreatic remnant (based on the presence of soft gland or small duct). Chi-squared tests and ANOVA were used to assess the relationship between this score and LOS, discharge before postoperative day 7, readmission, mortality, delayed gastric emptying (DGE), and pancreatic leak/fistula.

RESULTS

291 patients were identified. Mean length of stay was 8.5 days in those patients who scored 0 compared to 16.2 days for those who scored 4 (p = 0.001). 30% of patients who scored 0 were discharged before postoperative day 7 compared to 0% of those who scored 4 (p = 0.019). Readmission rates for patients who scored 0 and 4 were 12% and 33%, respectively (p = 0.017). Similarly, postoperative pancreatic fistula occurred in 2% versus 25% in these groups (p = 0.007).

CONCLUSION

A simple scoring system using BMI, operating time, EBL, and pancreatic remnant quality can help risk-stratify postoperative PD patients. Those with lower scores could potentially be managed via an ERAS protocol. Patients with higher scores required longer hospitalizations, and adjunctive therapy such as medication and surgical technique to decrease risk of delayed gastric emptying and pancreatic fistula could be considered.

Personal predictive model based on systemic inflammation markers for estimation of postoperative pancreatic fistula following pancreaticoduodenectomy

BACKGROUND

Postoperative pancreatic fistula (PF) is a serious life-threatening complication after pancreaticoduodenectomy (PD). Our research aimed to develop a machine learning (ML)-aided model for PF risk stratification.

AIM

To develop an ML-aided model for PF risk stratification.

METHODS

We retrospectively collected 618 patients who underwent PD from two tertiary medical centers between January 2012 and August 2021. We used an ML algorithm to build predictive models, and subject prediction index, that is, decision curve analysis, area under operating characteristic curve (AUC) and clinical impact curve to assess the predictive efficiency of each model.

RESULTS

A total of 29 variables were used to build the ML predictive model. Among them, the best predictive model was random forest classifier (RFC), the AUC was [0.897, 95% confidence interval (CI): 0.370–1.424], while the AUC of the artificial neural network, eXtreme gradient boosting, support vector machine, and decision tree were between 0.726 (95%CI: 0.191–1.261) and 0.882 (95%CI: 0.321–1.443).

CONCLUSION

Fluctuating serological inflammatory markers and prognostic nutritional index can be used to predict postoperative PF.

Is it worthy to perform total pancreatectomy considering morbidity and mortality?: Experience from a high-volume single center

Total pancreatectomy (TP) is performed for diseases of the entire pancreas. However, reluctance remains regarding TP because of the fear of high morbidity and mortality. Our retrospective study aimed to evaluate the postoperative outcomes of TP performed at a high-volume single center and to identify the risk factors associated with major morbidities and mortality after TP. A total of 142 patients who underwent elective TP at Samsung Medical Center between 1995 and 2015 were included. TP was usually planned before surgery or decided during surgery [one-stage TP], and there were some completion TP cases that were performed to manage tumors that had formed in the remnant pancreas after a previous partial pancreatectomy [2-stage TP]. The differences between the 1-stage and 2-stage TP groups were analyzed. Chronological comparison was also conducted by dividing cases into 2 periods [the early and late period] based on the year TP was performed, which divided the total number of patients to almost half for each period. Among all TP patients, major morbidity occurred in 25 patients (17.6%), the rate of re-admission within 90-days was 20.4%, and there was no in-hospital and 30-days mortality. Between the 1-stage and 2-stage TP groups, most clinical, operative, and pathological characteristics, and postoperative outcomes did not differ significantly. Chronological comparison showed that, although the incidence of complications was higher, hospitalization was shorter due to advanced managements in the late period. The overall survival was improved in the late period compared to the early period, but it was not significant. A low preoperative protein level and N2 were identified as independent risk factors for major morbidity in multivariable analysis. The independent risk factors for poor overall survival were R1 resection, adenocarcinoma, and high estimated blood loss (EBL). TP is a safe and feasible procedure with satisfactory postoperative outcomes when performed at a high-volume center. More research and efforts are needed to significantly improve overall survival rate in the future.

Risk factors of clinically relevant postoperative pancreatic fistula after pancreaticoduodenectomy: A systematic review and meta-analysis

BACKGROUND

Clinically relevant postoperative pancreatic fistula (CR-POPF) is a common and troublesome complication after pancreatoduodenectomy (PD). We conducted a systematic review and meta-analysis to identify the risk factors of CR-POPF after PD.

METHODS

We searched PubMed, EMBASE, and Cochrane Library databases for studies related to risk factors of CR-POPF after PD. Odds ratios (ORs) with corresponding 95% confidence intervals (CIs) were extracted from the included studies, then a meta-analysis was conducted. If necessary, sensitivity analysis would be performed by changing the effect model or excluding 1 study at a time. Publication bias was assessed by funnel plot and Begg test and Egger test.

RESULTS

A total of 27 studies with 24,740 patients were included, and CR-POPF occurred in 3843 patients (incidence = 17%, 95% CI: 16%-19%). Male (OR = 1.56, 95% CI: 1.42-1.70), body mass index >25 kg/m2 (OR = 1.98, 95% CI: 1.23-3.18), pancreatic duct diameter <3 mm (OR = 1.87, 95% CI: 1.66-2.12), soft pancreatic texture (OR = 3.49, 95% CI: 2.61-4.67), and blood transfusion (OR = 3.10, 95% CI: 2.01-4.77) can significantly increase the risk of CR-POPF. Pancreatic adenocarcinoma (OR = 0.54, 95% CI: 0.47-0.61), vascular resection (OR = 0.57, 95% CI: 0.39-0.83), and preoperative chemoradiotherapy (OR = 0.68, 95% CI: 0.57-0.81) can significantly decrease the factor of CR-POPF. Diabetes mellitus was not statistically associated with CR-POPF (OR = 0.66, 95% CI: 0.40-1.08). However, the analysis of body mass index, pancreatic texture, and diabetes mellitus had a high heterogeneity, then sensitivity analysis was performed, and the result after sensitivity analysis showed diabetes mellitus can significantly decrease the risk of CR-POPF. There was no significant publication bias in this meta-analysis.

CONCLUSIONS

The current review assessed the effects of different factors on CR-POPF. This can provide a basis for the prevention and management of CR-POPF. Effective interventions targeting the above risk factors should be investigated in future studies for decreasing the occurrence of CR-POPF.

Severity of Pancreatic Leak in Relation to Gut Restoration After Pancreaticoduodenectomy: The Role of the Roux-en-Y Configuration

Background

Pancreatic leak after pancreaticoduodenectomy and gut restoration via a single jejunal loop remains the crucial predictor of patients' outcome. Our reasoning that active pancreatic enzymes may be more disruptive to the pancreatojejunostomy prompted us to explore a Roux-en-Y configuration for the gut restoration, anticipating diversion of bile salts away from the pancreatic stump. Our study aims at comparing two techniques regarding the severity of postoperative pancreatic fistula (POPF) and patients' outcome.

Methods

The files of 415 pancreaticoduodenectomy patients were retrospectively reviewed. Based on gut restoration, the patients were divided into: cohort A (n = 105), with gut restoration via a single jejunal loop, cohort B (n = 140) via a Roux-en-Y technique assigning the draining of pancreatic stump to the short limb and gastrojejunostomy and bile (hepaticojejunostomy) flow to long limb, and cohort C (n = 170) granting the short limb to the gastric and pancreatic anastomosis, whereas hepaticojejunostomy was performed to the long limp. The POPF-related morbidity and mortality were analyzed.

Results

Overall POPF in cohort A versus cohorts B and C was 19% versus 12.1% and 9.4%, respectively (P = 0.01 A vs B + C). POPF-related morbidity in cohort A versus cohorts B and C was 10.5% versus 7.3% and 6.3%, respectively (P = 0.03 A vs B+C). POPF-related total hospital mortality in cohorts A versus B and C was 1.9% versus 0.8% and 0.59%, respectively (P = 0.02 A vs B+C).

Conclusion

Roux-en-Y configuration showed lower incidence and severity of POPF. Irrespective of technical skill, creating a gastrojejunostomy close to pancreatojejunostomy renders the pancreatic enzymes less active by leaping the bile salts away from the pancreatic duct and providing a lower pH.

Pande R, Halle-Smith JM, Phelan L, Thorne T, Panikkar M, Hodson J, Roberts KJ, Arshad A, Connor S, Conlon KC, Dickson EJ, Giovinazzo F, Harrison E, de Liguori Carino N, Hore T, Knight SR, Loveday B, Magill L, Mirza D, Pandanaboyana S, Perry RJ, Pinkney T, Siriwardena AK, Satoi S, Skipworth J, Stättner S, Sutcliffe RP, Tingstedt B. External validation of postoperative pancreatic fistula prediction scores in pancreatoduodenectomy: a systematic review and meta-analysis

BACKGROUND

Multiple risk scores claim to predict the probability of postoperative pancreatic fistula (POPF) after pancreatoduodenectomy. It is unclear which scores have undergone external validation and are the most accurate. The aim of this study was to identify risk scores for POPF, and assess the clinical validity of these scores.

METHODS

Areas under receiving operator characteristic curve (AUROCs) were extracted from studies that performed external validation of POPF risk scores. These were pooled for each risk score, using intercept-only random-effects meta-regression models.

RESULTS

Systematic review identified 34 risk scores, of which six had been subjected to external validation, and so included in the meta-analysis, (Tokyo (N=2 validation studies), Birmingham (N=5), FRS (N=19), a-FRS (N=12), m-FRS (N=3) and ua-FRS (N=3) scores). Overall predictive accuracies were similar for all six scores, with pooled AUROCs of 0.61, 0.70, 0.71, 0.70, 0.70 and 0.72, respectively. Considerably heterogeneity was observed, with I2 statistics ranging from 52.1-88.6%.

CONCLUSION

Most risk scores lack external validation; where this was performed, risk scores were found to have limited predictive accuracy. . Consensus is needed for which score to use in clinical practice. Due to the limited predictive accuracy, future studies to derive a more accurate risk score are warranted.

Daily Triglyceride Output Volume as an Early Predictor for Chyle Leak Following Pancreaticoduodenectomy

BACKGROUND/AIM

Useful prophylaxes of chyle leak (CL) after pancreatic surgery have not been established. The aim of the study was to identify an early clinical predictor for CL.

PATIENTS AND METHODS

Fifty-five patients who underwent subtotal stomach preserved pancreaticoduodenectomy (SSPPD) were included. Clinical factors associated with postoperative CL were evaluated.

RESULTS

Eleven patients (20%) developed a CL after SSPPD. Shorter operative time, absent pancreatic fistula, and triglyceride output volume at postoperative day (POD) two were independent risk factors for CL. The receiver operating characteristics curve of the daily triglyceride output volume at POD two indicated a cut-off point of 177 mg (AUC=0.782; p=0.004; 95% CI=0.639-0.925). CL was significantly associated with prolonged postoperative hospital stay in patients who did not develop a pancreatic fistula (p=0.003).

CONCLUSION

Daily triglyceride output volume of >177 mg at POD two may be a predictor of CL following pancreaticoduodenectomy.

Methods of preventing the occurrence of postoperative complications in patients with pancreaticoduodenectomy

BACKGROUND

To develop a prevention system that allows to reduce frequency of pancreatic fistula and severe postoperative complications after pancreaticoduodenectomy.

METHODS

In our department results of 143 pancreatic head resections were analyzed in the period from January 2017 to December 2019. In the main group we proposed pancreatic fistula prevention system and assessment of sarcopenia that were applied in 56 patients during a year (from November 2018 to December 2019). In patients with high risk of pancreatic fistula we performed pancreato-jejunostomy with external drainage of the main pancreatic duct (stent) during the reconstructive stage after pancreatoduodenectomy. The comparison group was comprised of 87 patients. They were operated in the period from January 2017 to October 2018 without assessment of the pancreatic fistula risk and presence of sarcopenia. Decision on the type of pancreatic anastomosis was based on surgeon's preference.

RESULTS

The level of postoperetive complications was significantly higher in the comparison group 26 (29.9%) and 7 (12.5%) in the main group (χ2= 5.8, p = 0.01). The level of postoperative pancreatic fistula grade B or C was in 15 (17.2%) of 26 patients in the comparison group, which is significantly higher than in the main group, where the fistula gr. B occurred in 1 (1.8%) patient (χ2= 8.19, p = 0.004).

CONCLUSIONS

The developed prevention system allowed to reduce significantly the incidence of postoperative pancreatic fistula from 17.2% to 1.8% and the number of severe postoperative complications from 29.9% to 12.5%.

Systematic review and meta-analysis of factors associated with post-operative pancreatic fistula following pancreatoduodenectomy

BACKGROUND

Many studies have explored factors relating to post-operative pancreatic fistula (POPF); however, the original definition (All-POPF) was revised to include only 'clinically relevant' (CR) POPF. This study identified variables associated with the two International Study Group on Pancreatic Surgery definitions to identify which variables are more strongly associated with CR-POPF.

METHODS

A systematic review identified all studies reporting risk factors for POPF (using both International Study Group on Pancreatic Fistula definitions) following pancreatoduodenectomy. The primary outcome was factors associated with CR-POPF. Meta-analyses (random effects models) of pre-, intra- and post-operative factors associated with POPF in more than two studies were included.

RESULTS

Among 52 774 patients All-POPF (n = 69 studies) and CR-POPF (n = 53 studies) affected 27% (95% confidence interval (CI95% ) 23-30) and 19% (CI95% 17-22), respectively. Of the 176 factors, 24 and 17 were associated with All- and CR-POPF, respectively. Absence of pre-operative pancreatitis, presence of renal disease, no pre-operative neoadjuvant therapy, use of post-operative somatostatin analogues, absence of associated venous or arterial resection were associated with CR-POPF but not All-POPF.

CONCLUSION

In conclusion this study demonstrates wide variation in reported rates of POPF and that several risk factors associated with CR-POPF are not used within risk prediction models. Data from this study can be used to shape future studies, research and audit across ethnic and geographic boundaries in POPF following pancreatoduodenectomy.

The comparation of short-term outcome between laparoscopic and open pancreaticoduodenectomy: a propensity score matching analysis

Pancreaticoduodenectomy (PD) is one of the most complex and delicate operations in abdominal surgery. With the development of laparoscopic techniques, more and more pancreatic experts have become skilled in laparoscopic pancreaticoduodenectomy (LPD). However, the short-term efficacy of LPD compared to open pancreaticoduodenectomy (OPD) remains unclear. Here, we performed a propensity score matching study aiming to compare the short outcomes of patients who underwent LPD or OPD after the learning curve and established a risk model of pancreatic fistula. The data of 346 patients who had OPD or LPD from July 2015 to January 2020 were retrieved. After a 1:1 matching, 224 patients remained. The operation time was significantly longer (P = 0.001) but the amount of bleeding was significantly lower (P = 0.001) in the LPD group than in the OPD group. Patients in LPD group had fewer blood transfusions (P = 0.002) than those in OPD group. More lymph nodes (P < 0.001) were dissected in LPD group. The rate of grade B/C pancreatic fistula was significantly higher in the LPD group than in the OPD group (16.1% vs. 6.3%, P = 0.002). By multi variate Logistic regression analysis, we identified pancreatic tumor, malignancy and low body mass index were risk factors of Grade B/C pancreatic fistula after PD operation. Then, we developed a Grade B/C pancreatic fistula nomogram with the risk factors. The C-index of the nomogram was 0.836 (95% CI 0.762-0.910). In conclusion, LPD could be technically feasible, get less trauma and achieve similar short-term outcome as compared with OPD.

The Impact of Patient Age ≥80 Years on Postoperative Outcomes and Treatment Costs Following Pancreatic Surgery

As life expectancy is increasing, elderly patients are evaluated more frequently for resection of benign or malignant pancreatic lesions. However, the impact of age on postoperative morbidity, mortality, and treatment costs in octogenarian patients (≥80 years) undergoing major pancreatic surgery needs further investigation. The clinicopathological data of patients who underwent pancreatic surgery between January 2015 and March 2019 in a major hepatopancreatobiliary center in Switzerland were assessed. Postoperative outcomes and hospital costs of octogenarians and younger patients were compared in univariate and multivariate regression analysis. During the study period, 346 patients underwent pancreatic resection. Pancreatoduodenectomy, distal pancreatectomy, total pancreatectomy, and other procedures were performed in 54%, 20%, 13%, and 13% of patients, respectively. The major postoperative morbidity rate and postoperative mortality rate were 25% and 3.5%, respectively. A total of 39 patients (11%) were ≥80 years old, and 307 patients were <80 years old. The majority of octogenarians suffered from ductal adenocarcinoma, whereas among younger patients, other indications for a pancreatic resection were predominant (ductal adenocarcinoma 64% vs. 41%, p = 0.006). Age ≥80 was associated with more frequent postoperative medical (pulmonary, cardiovascular) and surgical (high-grade pancreatic fistula, postoperative hemorrhage) complications. Postoperative mortality was significantly higher in octogenarians (15.4% vs. 2%, p < 0.0001). This finding may be explained by the higher rate of type C pancreatic fistula (13% vs. 5%), resulting more frequently in postoperative hemorrhage (18% vs. 5%, p = 0.002) among patients ≥80 years old. In the multivariate logistic regression analysis, patient age ≥80 years predicted postoperative mortality independently of the tumor entity and surgical technique (p = 0.013, OR 6.71, 95% CI [1.5–30.3]). Increased major postoperative morbidity was responsible for lower cost recovery in octogenarians (94% vs. 102%, p = 0.046). In conclusion, patient age ≥80 years is associated with increased postoperative medical and surgical morbidity after major pancreatic surgery leading to lower cost recovery and a lower chance for successful resuscitation in patients requiring revisional surgery for postoperative hemorrhage and/or pancreatic fistula. In octogenarian patients suffering from pancreatic tumors, careful selection, and thorough prehabilitation is crucial to achieve the best postoperative and long-term oncologic outcomes.

Significant association between the preoperative erythrocyte mean corpuscular volume and infectious complications after pancreaticoduodenectomy

PURPOSE

An organ/space surgical site infection reportedly develops in 20% of patients who undergo pancreaticoduodenectomy (PD). The present study aimed to identify the predictors for developing severe infectious complications after PD.

METHODS

We retrospectively reviewed the records of 115 consecutive patients who underwent PD at Ehime University Hospital between January 2013 and January 2020. Severe infectious complications were defined as Clavien-Dindo classification grade ≥ III postoperative complications related to bacterial or fungal infections, including clinically relevant postoperative pancreatic fistula (CR-POPF). The patient characteristics, blood chemistry data, body composition data and operative data were evaluated as potential predictors of severe infectious complications. We also evaluated the erythrocyte indices, such as the mean corpuscular hemoglobin, the mean corpuscular hemoglobin concentration, and the mean corpuscular volume (MCV).

RESULTS

Among 115 patients, 25 (21.7%) developed severe infectious complications, which included 20 (17.4%) cases of CR-POPF. According to multivariate analyses, MCV > 97.4fL, C-reactive protein (CRP) > 1.2 mg/dL and diameter of main pancreatic duct < 5 mm were independent predictors of severe infectious complications (odds ratio, 13.891, 7.356 and 4.676, respectively, 95% confidence interval, 3.457-55.815, 1.868-28.964 and 1.391-15.716, respectively).

CONCLUSION

Preoperative high MCV/CRP values and a small main pancreatic duct are predictive factors associated with severe infectious complications after PD.

A deep pancreas is a novel predictor of pancreatic fistula after pancreaticoduodenectomy in patients with a nondilated main pancreatic duct

BACKGROUND

We investigated the risk factors for clinically relevant postoperative pancreatic fistula after pancreaticoduodenectomy in patients with a nondilated main pancreatic duct.

METHODS

We investigated a total of 354 patients who underwent pancreaticoduodenectomy. The diameter of the main pancreatic duct, the shortest distance from the body surface to the pancreas (the pancreatic depth), and the computed tomography attenuation index (the difference between the pancreatic and splenic computed tomography attenuation) were measured in preoperative computed tomography.

RESULTS

One hundred eighty-one (51.1%) patients had a nondilated main pancreatic duct, and 50 (27.6%) of the 181 patients with a nondilated main pancreatic duct developed a clinically relevant postoperative pancreatic fistula. Univariate analyses revealed that the calculated body mass index (≥21.8 kg/m²) (P = .004), deep pancreas (pancreatic depth ≥51.2 mm) (P = .001), and low computed tomography attenuation index (≤-3.8 Hounsfield units) (P = .02) were significant risk factors for clinically relevant postoperative pancreatic fistula. The multivariate logistic regression analysis revealed that deep pancreas (odds ratio 2.370; 95% confidence interval 1.0019-5.590; P = .049) was an independent risk factor for clinically relevant postoperative pancreatic fistula. Among patients with a nondilated main pancreatic duct, deep pancreas (in comparison to patients without deep pancreas) was associated with male sex (72.7% vs 54.9%; P = .016), higher body mass index (22.5 kg/m² vs 19.6 kg/m²; P < .001), a history of diabetes mellitus (24.5% vs 8.5%; P = .006), a lower computed tomography attenuation index (-9.6 Hounsfield units vs -4.6 Hounsfield units; P = .007), a longer operative time (454 minutes vs 420 minutes; P = .007), and a higher volume of intraoperative blood loss (723 mL vs 500 mL; P < .001), respectively.

CONCLUSION

Deep pancreas may be an important parameter associated with significant risk factors for clinically relevant postoperative pancreatic fistula after pancreaticoduodenectomy in patients with a nondilated main pancreatic duct.

Predictive Factors for Postoperative Pancreatic Fistula-A Swedish Nationwide Register-Based Study

BACKGROUND

A serious complication after pancreatoduodenectomy (PD) is postoperative pancreatic fistula (POPF). The aim of this study was to analyse the incidence and predictive factors for POPF by using a large nationwide cohort.

METHODS

Data from the Swedish National Registry for Pancreatic and Periampullary Cancer for all patients undergoing a PD from 2010 until 30th June 2018 were collected. The material was analysed in two groups, no POPF and clinically relevant (grade B and C) POPF.

RESULTS

A total of 2503 patients underwent PD, of which 245 (10%) developed POPF. Patients with POPF had significantly more overall complications (Clavien Dindo ≥3a, 75% vs. 21%, p < 0.001) and longer hospital stay (median 23 [16-35] vs. 11 [8-15], p < 0.001) than patients without POPF. The risk of POPF was higher with increased BMI (OR 1.08, p < 0.001). Preoperative presence of diabetes (OR 0.52, p = 0.012) and preoperative biliary drainage (OR 0.34, p < 0.001) reduced the risk of POPF. Reconstruction with pancreaticojejunostomy caused a more than two folded increase in POPF compared with pancreaticogastrostomy (OR 2.41, p < 0.001). Weight gain ≥2 kg on postoperative day 1 was also a risk factor (OR 1.76, p < 0.001).

CONCLUSION

A high BMI, a pancreaticojejunostomy and postoperative weight gain were risk factors for developing POPF. Diabetes or preoperative biliary drainage was protective.

The Effect of Fibrinogen/Thrombin-Coated Collagen Patch (TachoSil®) Application in Pancreaticojejunostomy for Prevention of Pancreatic Fistula After Pancreaticoduodenectomy: A Randomized Clinical Trial

BACKGROUND

Fibrin sealants and topical glue have been studied to reduce the incidence of postoperative pancreatic fistulas (POPF) after pancreatico-enteric anastomosis, but a definitive innovation is still needed. We aim to evaluate the effectiveness of fibrin sealant patch applied to pancreatico-enteric anastomosis to reduce postoperative complications, including POPF.

METHODS

This study was a single-center, prospective, randomized, phase IV trial involving three pancreaticobiliary surgeons. The primary outcome was POPF; secondary outcomes included complications, drain removal days, hospital stay, readmission rate, and cost. Risk factors for POPF were identified by logistic regression analysis.

RESULTS

A total of 124 patients were enrolled. Biochemical leakage (BL) or POPF occurred in 16 patients (25.8%) in the intervention group and 23 patients (37.1%) in the control group (no statistical significance). Clinically relevant POPF occurred in 4 patients (6.5%) in both the intervention and control groups (p = 1.000). Hospital stay (11.6 days vs. 12.1 days, p = 0.585) and drain removal days (5.7 days vs. 5.3 days, p = 0.281) were not statistically different between two groups. Complication rates were not different between the two groups (p = 0.506); nor were readmission rates (12.9% vs. 11.3%, p = 1.000) or cost ($13,549 vs. $15,038, p = 0.103). In multivariable analysis, age and soft pancreas texture were independent risk factors for BL or POPF in this study. Applying fibrin sealant patch is not a negative risk factor, but the p value may indicate a likelihood of reducing the incidence of BL (p = 0.084).

CONCLUSIONS

Fibrin sealant patches after pancreaticojejunostomy did not reduce the incidence of POPF or other postoperative complications. This study was registered at clinicaltrials.gov (NCT03269955).

[Contrast-enhanced computed tomography in evaluation of pancreatic stump volume in pancreaticoduodenectomy]

OBJECTIVE

To analyze the role of contrast-enhanced computed tomography in evaluation of pancreatic stump volume for prediction of significant pancreatic fistula.

MATERIAL AND METHODS

A retrospective analysis enrolled 99 patients. Patients were divided into 2 groups depending on the course of postoperative period and development of clinically significant pancreatic fistula. The first group included 24 patients (25%) with clinically significant postoperative pancreatic fistula. The second group included 75 patients (75%) without postoperative complications. Pancreatic structure, pancreatic parenchyma thickness (mm), pancreatic duct diameter (mm) and volume of pancreatic stump (cm³) were preoperatively analyzed considering contrast-enhanced computed tomography data.

RESULTS

The risk of postoperative pancreatic fistula is 10 times higher in case of soft structure of the pancreas, 1,7 times higher in decrease of pancreatic duct diameter, 9,3 times higher in increased volume of residual pancreatic parenchyma, 8.6 times higher in increase of pancreatic parenchyma thickness.

CONCLUSION

Contrast-enhanced computed tomography is valuable for preoperative evaluation of the volume of residual pancreatic parenchyma and identification of patients with high risk of postoperative pancreatic fistula.

Comparison of three fistula risk scores after pancreatoduodenectomy: A single-institution retrospective study

BACKGROUND

Postoperative pancreatic fistula (POPF) after pancreatoduodenectomy greatly influences patients' postoperative course. Several evaluation methods have been used to assess the risk of clinically relevant POPF (CR-POPF) after pancreatoduodenectomy namely, the original, alternative, and updated alternative fistula risk scores (o-FRS, a-FRS, and ua-FRS, respectively).

METHODS

We enrolled 106/179 patients who underwent pancreatoduodenectomy in our institution between April 2013 and Mar 2018. CR-POPF was defined as grade B and C POPF according to the 2016 definitions of the International Study Group on Pancreatic Surgery.

RESULTS

Pancreatic gland texture was the only significant risk factor for CR-POPF (p = 0.007). The CR-POPF incidence increased significantly according to the risk groups defined by both o-FRS (p = 0.004) and a-FRS (p = 0.004). The area under the curve for o-FRS, a-FRS, and ua-FRS was 0.693, 0.693, and 0.671, respectively.

CONCLUSION

o-FRS, a-FRS, and ua-FRS were almost equally useful for risk evaluation for CR-POPF after pancreatoduodenectomy. Further studies, especially for preoperative objective evaluation of pancreatic gland texture, are needed for more useful and accurate risk evaluation.