Amylase value in drains after pancreatic resection as predictive factor of postoperative pancreatic fistula: results of a prospective study in 137 patients

Decision points in pancreatoduodenectomy: Insights from the contemporary experts on prevention, mitigation, and management of postoperative pancreatic fistula

BACKGROUND

Despite abundant, high-level scientific evidence, there is no consensus regarding the prevention, mitigation, and management of clinically relevant pancreatic fistula after pancreatoduodenectomy. The aim of the present investigation is three-fold: (1) to analyze the multiple decision-making points for pancreatico-enteric anastomotic creation and fistula mitigation and management after pancreatoduodenectomy, (2) to reveal the practice of contemporary experts, and (3) to indicate avenues for future research to reduce the burden of clinically relevant pancreatic fistula.

METHODS

A 109-item questionnaire was sent to a panel of international pancreatic surgery experts, recognized for their clinical and scientific authority. Their practice habits and thought processes regarding clinically relevant pancreatic fistula risk assessment, anastomotic construction, application of technical adjuncts, and mitigation strategies, as well as postoperative management, was explored. Sixteen clinical vignettes were presented to reveal their certain approaches to unique situations-both common and uncommon.

RESULTS

Sixty experts, with a cumulative 48,860 pancreatoduodenectomies, completed the questionnaire. Their median pancreatectomy/pancreatoduodenectomy case volume was 1,200 and 705 procedures, respectively, with a median career duration of 22 years and 200 indexed publications. Although pancreatico-jejunostomy reconstruction with transperitoneal drainage is the standard operative approach for most authorities, uncertainty emerges regarding the employment of objective risk stratification and adaptation of practice to risk. Concrete suggestions are offered to inform decision-making in intimidating circumstances. Early drain removal is frequently embraced, while a step-up approach is unanimously invoked to treat severe clinically relevant pancreatic fistula.

CONCLUSION

A comprehensive conceptual framework of 4 sequential phases of decision-making is proposed-risk assessment, anastomotic technique, mitigation strategy employment, and postoperative management. Basic science studies and outcome analyses are proposed for improvement.

Predictors and Outcomes of Pancreatic Fistula Following Pancreaticoduodenectomy: a Dual Center Experience

Fistula following leaked pancreatico-enteric anastomosis is a common, potentially lethal complication of pancreaticoduodenectomy (PD). Early assessment and prediction of its occurrence can improve postoperative outcomes. Various perioperative factors were analyzed for its contribution to clinically relevant postoperative pancreatic fistula (crPOPF). Also, the difference in clinical outcomes of patients with and without fistula was studied. Sixty-seven patients undergoing PD for malignancies were analyzed during 3-year period in a dual-institutional study. Various preoperative, intraoperative, and postoperative factors were assessed. The incidence and severity of POPF and its association with the development of other post-PD complications were observed. Patients with and without POPF were divided into groups and compared with univariate and multivariate analyses, to identify significant contributing factors. Clinically relevant POPF was present in 20.9% cases. crPOPF contributed to delayed gastric emptying, albeit insignificant (p = 0.403), but was significantly associated with increased incidence of post-pancreatectomy hemorrhagic (p = 0.005) and infectious complications (p = 0.013). Soft pancreas (p = 0.024), intraoperative blood loss (p = 0.045), blood transfusion (p = 0.024), and fistula risk score (p = 0.001) were significant predictors of crPOPF. First postoperative day (POD1) drain fluid amylase (DFA) values at cut-off of 1336 U/L (AUC = 0.871; p < 0.001) significantly predicted crPOPF with good sensitivity and specificity. POD1 DFA was only factor significant on multivariate analysis (p = 0.014). There was no significant difference in overall survival between groups. crPOPF results in significant post-pancreatectomy hemorrhagic and septic complications, along with increased mortality. It can be accurately predicted by several preoperative and intraoperative factors. POD1 DFA can independently predict crPOPF development.

Clinical relevant pancreatic fistula after pancreatoduodenectomy: when negative amylase levels tell the truth

Drain Amylase level are routinely determined to diagnose pancreatic fistula after Pancreatocoduodenectomy. Consensus is lacking regarding the cut-off value of amylase to diagnosis clinically relevant postoperative pancreatic fistulae (POPF). The present study proposes a model based on Amylase Value in the Drain (AVD) measured in the first three postoperative days to predict a POPF. Amylase cut-offs were selected from a previous published systematic review and the accuracy were validated in a multicentre database from 12 centres in 2 countries. The present study defined POPF the 2016 ISGPS criteria (3 times the upper limit of normal serum amylase). A learning machine method was used to correlate AVD with the diagnosis of POPF. Overall, 454 (27%) of 1638 patients developed POPF. Machine learning excluded a clinically relevant postoperative pancreatic fistulae with an AUC of 0.962 (95% CI 0.940-0.984) in the first five postoperative days. An AVD at a cut-off of 270 U/L in 2 days in the first three postoperative days excluded a POPF with an AUC of 0.869 (CI 0.81-0.90, p < 0.0001). A single AVD in the first three postoperative days may not exclude POPF after pancreatoduodenectomy. The levels should be monitored until day 3 and have two negative values before removing the drain. In the group with a positive level, the drain should be kept in and AVD monitored until postoperative day five.

Drain Lipase Levels and Decreased Rate of Drain Amylase Levels as Independent Predictors of Pancreatic Fistula with Nomogram After Pancreaticoduodenectomy

BACKGROUND

Pancreaticoduodenectomy (PD) has recently been improved due to its increased safety. However, postoperative pancreatic fistula (POPF) remains a lethal complication of PD. Identifying novel clinicophysiological risk factors for POPF during the early post-PD period would help improve patient morbidity and mortality. Therefore, this retrospective study aimed to evaluate possible risk factors during the early postoperative period after pancreaticoduodenectomy (PD).

METHODS

Data from 349 patients who underwent PD between 2007 and 2012 were examined retrospectively. All patients were classified into 2 groups: group A, patients without fistulae or biochemical leaks (288 patients), and group B, those with grade B or C POPF (61 patients). Data on various clinicophysiological parameters, including serum and drain laboratory data, were collected. Univariate and multivariate analyses were performed to evaluate POPF predictors. A predictive nomogram was established for these results.

RESULTS

Univariate analysis showed that various serum and drain-related factors, such as white blood cell count, C-reactive protein levels, drain amylase (DAMY) levels, and drain lipase (DLIP) levels, were possible POPF risk factors. Multivariate analysis confirmed that postoperative day (POD) 1 DLIP levels (hazard ratio, 15.393; p = 0.037) and decreased rate (POD3/1) of DAMY levels (hazard ratio, 4.415; p = 0.028) were independent risk factors. Further, POD1 DLIP levels and decreased rate of DAMY levels were significantly lower in group A than in group B. The accuracy of nomogram was 0.810.

CONCLUSIONS

POD1 DLIP levels (> 245 U/mL) and decreased rate of DAMY levels (> 0.44) were POPF risk factors, making them possible biomarkers for POPF.

Impact of the highest amylase level in drain fluid on surgical outcomes and postoperative interventions in patients undergoing pancreaticoduodenectomy

OBJECTIVES

The clinical significance of the highest drain fluid amylase (DFA) level beyond pancreaticoduodenectomy (PD) postoperative day three (POD 3) remains unclear. This study investigated the impact of highest DFA level beyond POD 3 on postoperative pancreatic fistula (POPF) severity and outcomes of patients undergoing PD with POPF.

METHODS

Patient demographics of biochemical POPF and clinically relevant POPF (CR-POPF) were compared. Predictive factors were assessed using binary logistic regression. Receiver operating characteristic curve analysis was performed to determine the optimal cutoff value of highest DFA (beyond POD 3). We compared length of hospital stay, surgical mortality rates, and need for postoperative interventions by highest DFA level.

RESULTS

Patients with CR-POPF had an older age (p = 0.039), required intraoperative blood transfusion (p = 0.006), and had greater highest DFA levels (p = 0.001) than those with biochemical POPF. The optimal highest DFA cutoff was 2014.5 U/L. Multivariate analysis showed that percentage of patients with intraoperative blood transfusion (p = 0.011; odds ratio, 3.716) and a highest DFA > 2014.5 U/L beyond POD 3 (p = 0.001; odds ratio, 5.722) was predictive of CR-POPF.

CONCLUSION

Highest DFA > 2014.5 U/L beyond POD 3 is an independent predictor for CR-POPF. At a highest DFA >2014.5 U/L, 30-day surgical mortality rate, length of stay, and need for postoperative interventions did not differ.

Optimal Timing to Assess Drain Amylase Concentration after Elective Gastrectomy

Purpose

While the amylase concentration of the drainage fluid (dAmy) has been reported to be a predictor of postoperative pancreas-related complications (PPRC), the optimal timing for its measurement has not been fully investigated.

Materials and Methods

The clinicopathological data of 387 patients who underwent elective gastrectomy for gastric cancer were reviewed. Laboratory data, including dAmy on postoperative days 1 (dAmy1) and 3 (dAmy3), and serum C-reactive protein (sCRP) concentrations on postoperative days 1 (sCRP1) and 3 (sCRP3) were compared between patients with PPRC and without PPRC.

Results

Nineteen of the 387 patients (4.9%) developed PPRC. The optimal cutoff values of dAmy1, dAmy3, sCRP1, and sCRP3 were 1514 IU/L, 761 IU/L, 8.32 mg/dL, and 15.15 mg/dL, respectively. The area under the curve of dAmy1 was greater than that of dAmy3 (0.915 vs. 0.826), and that of sCRP3 was greater than that of sCRP1 (0.820 vs. 0.659). In the multivariate analysis, dAmy1 (P<0.001) and sCRP3 (P=0.004) were significant predictors of PPRC, while dAmy3 (P=0.069) and sCRP1 (P=0.831) were not. Thirteen (41.9%) of 31 patients with both dAmy1 ≥1,545 IU/L and sCRP3 ≥15.15 mg/dL had PPRC ≥Clavien-Dindo II. In contrast, among 260 patients with both dAmy1 <1,545 IU/L and sCRP3 <15.15 mg/dL, none developed PPRC.

Conclusions

dAmy1 was more useful than dAmy3 in predicting PPRC. The combination of dAmy1 and sCRP3 may be a useful criterion for the removal of drains on postoperative day 3.

Proposal of a Clinically Useful Criterion for Early Drain Removal After Pancreaticoduodenectomy

PURPOSE

This study aimed to establish a reliable criterion for early drain removal after pancreaticoduodenectomy (PD) based on predictive factors of clinically relevant postoperative pancreatic fistula (CR-POPF) available on postoperative day 3 (POD3).

METHODS

A total of 300 consecutive patients who underwent PD with pancreaticojejunostomy at our hospital from 2011 to 2015 were analyzed retrospectively. CR-POPF was defined as POPF grade B or C according to the definition by ISGPF. Clinicopathological factors available on or before POD3 were analyzed to identify predictors of CR-POPF. Using obtained predictors, we developed a criterion for no CR-POPF and internally validated its relevance in 100 consecutive patients.

RESULTS

The incidence rates of CR-POPF, severe complications (Clavien-Dindo ≥ grade IIIa), and postoperative mortality were 35%, 9.6%, and 0.3%, respectively. Multivariate analysis showed that drain amylase (d-AMY) levels ≥ 350 IU/l on POD3, C-reactive protein (CRP) levels ≥ 14 mg/dl on POD3, preoperative endoscopic retrograde biliary drainage, and no portal vein resection were significant predictors of CR-POPF. Using the strongest predictors (i.e., d-AMY and CRP), we established a criterion for no CR-POPF: d-AMY levels < 350 IU/l and CRP levels < 14 mg/dl on POD3. The incidence rates of CR-POPF were 6%, 38%, and 88% in patients who fulfilled both of (n = 149), each of (n = 74), and none of (n = 77) the two factors, respectively. In the internal validation cohort, the positive predictive value of CR-POPF was 89%.

CONCLUSIONS

A simple two-factor criterion available on POD3 after PD has a reliable predictive ability. In patients who fulfill this criterion, early drain removal is considered safe.

Serum pancreatic enzymes in the early postoperative period predict complications associated with pancreatic fluid after pancreas transplantation: A retrospective, single-center, observational cohort study

BACKGROUND

Pancreas transplantation (PT) is a radical treatment for diabetes mellitus (DM). Although the results of PT have been improving, surgical complications remain. Few reports have focused on complications associated with pancreatic fluid (CAPF) after PT. We aimed to investigate the risk factors and predictors for CAPF after PT.

METHODS

Sixty-nine patients, who underwent deceased-donor PT for type 1 DM at our institution from August 2001 to May 2020, were retrospectively studied. We identified CAPF from those with Clavien-Dindo Classification ≥grade III and assessed risk factors by univariate and multivariate analyses using logistic regression.

RESULTS

Twenty-one (30.4%) patients had complications with Clavien-Dindo Classification ≥grade III. Eleven (16.0%) patients were diagnosed with CAPF. Median serum pancreatic amylase (P-AMY) levels with CAPF on postoperative day (POD)1 and POD2 were significantly higher than those without CAPF (P = .019 and P = .027, respectively). In multivariable analysis, serum P-AMY levels on POD1 were an independent predictive factor for CAPF (odds ratio 1.83, 95% confidence interval 1.07-3.14, P = .008).

CONCLUSIONS

Complications associated with pancreatic fluid after PT is associated with high serum P-AMY in the early postoperative period. Serum pancreatic enzymes in the first few postoperative days after PT may be a significant predictive factor for CAPF.

Early Fistulography Can Predict Whether Biochemical Leakage Develops to Clinically Relevant Postoperative Pancreatic Fistula

BACKGROUND

As complete prevention of postoperative pancreatic fistula (POPF) after pancreatic surgery remains difficult, many risk factors for clinically relevant POPF (CR-POPF) have been reported. However, their clinical impact could be limited because all previous reports included patients without biochemical leakage (BL) that rarely developed to CR-POPF. Therefore, a new strategy for identifying high-risk patients who develop delayed complications from patients with confirmed BL and for implementing interventions for such patients in the early postoperative period is required. This study aimed to examine the role of fistulography in predicting CR-POPF from confirmed BL.

METHODS

Consecutive patients diagnosed with BL on postoperative day 3 after pancreaticoduodenectomy (PD) or distal pancreatectomy (DP) from January 2013 to June 2015 in our institution were included. Fistulography was performed 1 week after the operation, and the associations between findings on fistulography and delayed complications associated with POPF were evaluated.

RESULTS

Eighty-four (37%) of 227 patients who underwent PD and 45 (48%) of 94 patients who underwent DP were included and divided to two groups according to fistulographic findings (simple type, n = 107, 83%; cavity type, n = 22, 17%). The latter finding was associated with a greater morbidity rate (Clavien-Dindo grade ≥ 2: 36% vs 59%, p = 0.018) and a worse final POPF grade (B/C 64% vs 95%, p = 0.003). In the multivariate analysis, cavity type on fistulography was a significant predictive factor for grade B/C POPF.

CONCLUSIONS

Fistulography is a useful examination for identifying patients with a high risk of developing delayed complications associated with POPF.

The modified Blumgart anastomosis after pancreaticoduodenectomy: a retrospective single center cohort study

Objectives

The postoperative pancreatic fistula (POPF) is a major complication after pancreatic head resection whereby the technique of the anastomosis is a very influencing factor. The literature describes a possible protective role of the Blumgart anastomosis.

Methods

Patients after pancreatic head resection with reconstruction through the modified Blumgart anastomosis (a 2 row pancreatic anastomosis through mattress sutures of the parenchyma and duct to mucosa pancreaticojejunostomy, Blumgart-group) were compared with patients after pancreatic head resection and reconstruction through the conventional pancreatojejunostomy (single suture technique of capsule and parenchyma to seromuscularis, PJ-group). The Data were collected retrospectively. Depending on the propensity score matching in a ratio of 1:2 comparison groups were set up. Blumgart-group (n=29) and PJ-group (n=56). The primary end point was the rate of POPF. Secondary goals were duration of operation, length of hospital stay, length of stay on intermediate care units and hospital mortality.

Results

The rate of POPF (biochemical leak, POPF "grade B" and POPF "grade C") was less in the Blumgart-group, but without statistical relevance (p=0.23). Significantly less was the rate of POPF "grade C" in the Blumgart-group (p=0.03). Regarding the duration of hospital stay, length of stay on intermediate care units and hospital mortality, there was no relevant statistical difference between the groups (p=0.1; p=0.4; p=0.7). The duration of the operation was significantly less in the Blumgart-group (p=0.001).

Conclusions

The modified Blumgart anastomosis technique may have the potential to decrease major postoperative pancreatic fistula.

Total Amylase Value in Drains After Gastrectomy for Predicting Postoperative Pancreatic Fistula

Objective

Postoperative pancreatic fistula (POPF) is defined using the ratio of the amylase concentration in abdominal drainage fluid to the upper normal range of serum amylase level. However, we hypothesized that the total amylase value in discharge (AVD) on postoperative day (POD) 3 may be more sensitive for predicting grade II or higher severe POPF (sPOPF) and compared the predictive power of the conventional definition of POPF and AVD for sPOPF.

Methods

One hundred fifty-one patients who underwent gastrectomy between October 2011 and February 2013 were analyzed. A drainage tube was placed in all the cases through the stump of the right gastroepiploic vein and the front of the pancreas to the back of the anastomotic site. The drainage volume and amylase concentration in the discharge were examined on POD 1, 3, and 5. AVD was calculated by multiplying the volume by the amylase concentration.

Results

Eight patients (5.3%) developed sPOPF. In univariate analysis, both AVD and the amylase concentration ratio was significantly correlated with sPOPF (P = 0.002 and 0.007, respectively). AVD on POD 3 showed the best predictive performance compared with the amylase concentration ratio on POD 3 (area under the curve 0.876 versus 0.844). Based on the cutoff values calculated from the receiver operating characteristic curves, AVD was more specific than amylase concentration ratio in predicting sPOPF (specificity: 97.6% versus 86.0%; positive predictive value: 62.5% vs. 23.1%).

Conclusion

AVD on POD 3 is a more specific parameter than conventional amylase concentration ratio in predicting sPOPF.

What should we trust to define, predict and assess pancreatic fistula after pancreatectomy?

OBJECTIVE

The ISGPF postoperative pancreatic fistula (POPF) definition using amylase drain concentration is widely used. However, the interest of lipase drain concentration, daily drain output and absolute enzyme daily production (concentration x daily drain volume) have been poorly investigated.

MATERIAL AND METHODS

These predictive on postoperative day (POD) 1, 3, 5 and 7 were analyzed in a development cohort, and subsequently tested in an independent validation cohort.

RESULTS

Of the 227 patients of the development cohort, 17% developed a biochemical fistula and 34% a POPF (Grade B/C). Strong correlation was found between amylase/lipase drain concentration at all postoperative days (ρ = 0.90; p = 0.001). Amylase and lipase were both significantly higher in patients with a POPF (p < 0.001) presenting an equivalent under the ROC curve area (0.85 vs 0.84; p = 0.466). Combining POD1 and POD3 threefold enzyme cut-off value increased significantly POPF prediction sensibility (97.4% vs 77.8%) and NPV (97.1% vs 86.3%). These results were also confirmed in the validation cohort of 554 patients. Finally, absolute enzyme daily production and daily drain output were significantly higher in patients with a POPF (p < 0.001) but did not add clinical value when compared to drain enzyme concentration.

CONCLUSION

Lipase is as effective as amylase drain concentration to define POPF. Absolute enzyme daily production or daily drain output do not help to better predict clinically significant POPF occurrence and severity. Lipase and amylase should mainly be used for their negative predictive value to predict the absence of clinically significant POPF and could allow early drain removal and hospital discharge.

Totally laparoscopic versus open pancreaticoduodenectomy: A propensity score matching analysis of short-term outcomes

INTRODUCTION

Laparoscopic pancreaticoduodenectomy (LPD) is a demanding operation that has not yet gained popularity. Safety, feasibility, and clinical advantages of LPD in comparison with open pancreaticoduodenectomy (OPD) have not been clearly demonstrated. The aim of this study was to compare the short term outcomes of LPD with those of OPD.

MATERIAL AND METHODS

Data from a prospectively collected database of patients who underwent pancreaticoduodenectomy at our institution between January 2013 and March 2020 were retrieved and analyzed, comparing the short-term postoperative outcomes of LPD and OPD, using a propensity score matching analysis.

RESULTS

In the study period, 177 patients undergoing pancreaticoduodenectomy were selected, 52 of these were LPD. In the LPD group, the conversion rate to OPD was 3.8%. After matching, a total of 50 LPD and 50 OPD were compared. LPD was associated with a shorter length of stay (14 vs 20 days, p = 0.011), decreased blood loss (255 vs 350 ml, p = 0.022), but longer median operative time (590 vs 382.5 min; p < 0.001). No significant difference was found between LPD and OPD in terms of overall complications (56% vs 62%, p = 0.542), severe complications (26% vs 22%, p = 0.640), and postoperative mortality (4% vs 6%, p = 0.646). The groups had similar reoperation rate, pancreatic-specific complications, and readmission rate.

CONCLUSIONS

In comparison with the open approach, LPD seems associated to with improved short-term outcomes in terms of hospital stay and blood loss, but with a longer operative time. No difference in morbidity and mortality rate were found in our series.

Characterization of postoperative acute pancreatitis (POAP) after distal pancreatectomy

BACKGROUND

Postoperative acute pancreatitis has recently been reported as a specific complication after pancreatoduodenectomy. The aim of this study was to characterize postoperative acute pancreatitis after distal pancreatectomy.

METHODS

We analyzed the outcomes retrospectively of 368 patients who underwent distal pancreatectomies during the period January 2016 to December 2019. Postoperative acute pancreatitis was defined as an increase of serum amylase activity greater than our laboratory normal upper limit on postoperative days 0 to 2. We assessed the incidence of postoperative acute pancreatitis after distal pancreatectomy and examined possible predictors of postoperative acute pancreatitis and relationships of postoperative acute pancreatitis with postoperative pancreatic fistula.

RESULTS

The rates of postoperative acute pancreatitis and postoperative pancreatic fistula after distal pancreatectomy were 67.9% and 28.8%, respectively. Patients who developed postoperative acute pancreatitis experienced an increased rate of severe morbidity (18.4 vs 9.3%; P = .030). Neoadjuvant therapy (odds ratio 0.28, 0.09-0.85; P = .025), age ≥ 65 y (odds ratio 0.34, 0.13-0.85; P = .020), duct size (odds ratio 0.02, 0.002-0.47; P = .013), pancreatic thickness (odds ratio 3.4, 1.29-8.9; P = .013), resection at the body-tail level (odds ratio 4.3, 1.15-23.19; P = .041), and neuroendocrine histology (odds ratio 1.14, 1.06-3.90; P = .013) were independent predictors of postoperative acute pancreatitis. Furthermore, postoperative acute pancreatitis was an independent predictor of postoperative pancreatic fistula (odds ratio 5.8, 2.27-15.20; P < .001). Postoperative pancreatic fistula occurred in 37% of patients who developed postoperative acute pancreatitis. Patients developing postoperative acute pancreatitis alone demonstrated a statistically significantly increased rate of biochemical leakage and bacterial contamination in the peripancreatic drainage fluid.

CONCLUSION

Postoperative acute pancreatitis is a frequent event after distal pancreatectomy and, despite its close association with postoperative pancreatic fistula, evidently represents a separate phenomenon. A universally accepted definition of postoperative acute pancreatitis that applies to all types of pancreatic resections is needed, because it may identify patients at greater risk for additional morbidity immediately after pancreatic resections.

The Landmark Series: Mitigation of the Postoperative Pancreatic Fistula

Pancreatic fistula has been the defining complication and challenge of pancreatic surgery. Better awareness and mitigation of postoperative pancreatic fistulas has led to significant improvements in morbidity and mortality of pancreatic surgery. The definition and management of pancreatic fistulas has sequentially progressed over the last three decades; the literature ranges from retrospective, observational studies to prospective multicenter randomized controlled trials. The landmark literature contributions driving the perioperative management of pancreatic fistulas are detailed in this article.

Risk factors and preventive measures for postoperative pancreatic fistula after pancreaticoduodenectomy

Postoperative pancreatic fistula (POPF) is the most serious complication after pancreaticoduodenectomy (PD), which can lead to slow recovery, deterioration, and even reoperation and death. At present, the mortality rate after PD has decreased, but the incidence of POPF is still high. Therefore, exploring the risk factors and prevention strategies for pancreatic fistula has become a hot research topic in pancreatic surgery. This paper summarizes the nature, risk factors, and preventive measures for POPF.

Preoperative systemic inflammatory biomarkers and postoperative day 1 drain amylase value predict grade C pancreatic fistula after pancreaticoduodenectomy

Background

Postoperative day 1-drains amylase (POD1-DA) values are commonly used to predict the risk of pancreatic fistula (PF) after pancreaticoduodenectomy (PD). Perioperative inflammatory biomarkers have been associated to higher risk of complications in different oncological surgeries. Aim of this study was to investigate the utility of the combination of preoperative inflammatory biomarkers (PIBs) with POD1-DA levels in predicting grade C PF.

Materials and methods

From a prospective collected database of 317 consecutive pancreaticoduodenectomies, data regarding POD1-DA levels and PIBs as neutrophil-to-lymphocyte ratio (NRL), derived neutrophil-to-lymphocyte ratio (dNRL), platelet-to-lymphocyte ratio (PLR) were analyzed in 227 cases. P-values <0.05 were considered statistically significant. Receiver operating characteristic (ROC) curves defined the optimal thresholds for biomarkers and drains amylase values and their accuracy to predict PF. Furthermore, the Positive Predictive Value (PPV) was computed to evaluate the probability to develop PF combining PIBs and drains amylase values. Combination of drains amylase and different PIBs cut-offs were used to evaluate the risk of grade C PF.

Results

A POD1-DA level of 351 U/L significantly predicted PF (sensitivity 82.7%, specificity 76%, AUC 0.836; p < 0.001) with a PPV of 76.5% and a NPV of 82.6%.

POD1-DA levels ≥807 U/L significantly predicted grade C PF (sensitivity 72.7%, specificity 64.4%, AUC 0.676; p = 0.004) with a PPV of 17.8% and a NPV of 95.6%.

Notably, this last PPV increased from 17.8% to 89% when PIBs, at different cut-offs, were combined with POD1-DA at the value ≥ 807 U/L.

Conclusion

PIBs significantly improve POD1-DA ability in predicting grade C PF after PD.

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Grade C pancreatic fistula is a major complication after pancreaticoduodenectomy.

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Postoperative day 1-drain amylase levels is a reliable predictor of pancreatic fistula.

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Systemic inflammatory biomarkers and postoperative day 1-drain amylase levels may predict grade C pancreatic fistula.

Postoperative hyperamylasemia (POH) and acute pancreatitis after pancreatoduodenectomy (POAP): State of the art and systematic review

BACKGROUND

Postoperative hyperamylasemia is a frequent finding after pancreatoduodenectomy, but its incidence and clinical implications have not yet been analyzed systematically. The aim of this review is to reappraise the concept of postoperative hyperamylasemia with postoperative acute pancreatitis, including its definition, interpretation, and correlation.

METHODS

Online databases were used to search all available relevant literature published through June 2019. The following search terms were used: "pancreaticoduodenectomy," "amylase," and "pancreatitis." Surgical series reporting data on postoperative hyperamylasemia or postoperative acute pancreatitis were selected and screened.

RESULTS

Among 379 screened studies, 39 papers were included and comprised data from a total of 9,220 patients. Postoperative hyperamylasemia was rarely defined in most of these series, and serum amylase values were measured at different cutoff levels and reported on different postoperative days. The actual levels of serum amylase activity and the representative cutoff levels required to reach a diagnosis of postoperative acute pancreatitis were markedly greater on the first postoperative days and tended to decrease over time. Most studies analyzing postoperative hyperamylasemia focused on its correlation with postoperative pancreatic fistula and other postoperative morbidities. The incidence of postoperative acute pancreatitis varied markedly between studies, with its definition completely lacking in 40% of the analyzed papers. A soft pancreatic parenchyma, a small pancreatic duct, and pathology differing from cancer or chronic pancreatitis were all predisposing factors to the development of postoperative hyperamylasemia.

CONCLUSION

Postoperative hyperamylasemia has been proposed as the biochemical expression of pancreatic parenchymal injury related to localized ischemia and inflammation of the pancreatic stump. Such phenomena, analogous to those associated with acute pancreatitis, could perhaps be renamed as postoperative acute pancreatitis from a clinical standpoint. Patients with postoperative acute pancreatitis experienced an increased rate of all postoperative complications, particularly postoperative pancreatic fistula. Taken together, the discrepancies among previous studies of postoperative hyperamylasemia and postoperative acute pancreatitis outlined in the present review may provide a basis for stronger evidence necessary for the development of universally accepted definitions for postoperative hyperamylasemia and postoperative acute pancreatitis.

Förster resonance energy transfer (FRET)-Labeled nanoprobe enables real-time diagnosis of pancreatic juice activation due to postoperative pancreatic fistula

OBJECTIVES

Postoperative pancreatic fistula (POPF) subsequent to pancreatectomy often causes activation of pancreatic juice, resulting in serious complications. In POPF, the types of pancreatic juices found are active and inactive, and the identification of these two types of pancreatic juice greatly contributes to the development of postoperative management after pancreatectomy. This study reports favorable results of the clinical application of the Förster resonance energy transfer (FRET) nanoprobe that was independently developed to distinguish between the active and inactive types of pancreatic juice.

METHODS

The FRET nanoprobe developed was a nanoprotein capsule. It exuded a red color when the capsule structure was maintained. When activated protease in the pancreatic juice acts on it, the capsules are reduced quantitatively and FRET is abolished, resulting in a change in color from red to green. Pancreatic juice activation can be measured by the FRET signal. A total of 117 drainage fluid samples from 16 postpancreatoduodenectomy cases were obtained and evaluated.

RESULTS

The diagnosis of pancreatic juice activation was possible using the FRET signal with a cut-off value of 1.6. Pancreatic juice activation was not associated with drainage fluid amylase (AMY) levels. The results demonstrated that pancreatic juice was activated when drainage fluid was infected.

CONCLUSION

The use of a FRET nanoprobe enabled real-time detection of the presence or absence of pancreatic juice activation in pancreatic fistula after pancreatic surgery. There was an adequate correlation between infection and pancreatic juice activation regardless of drain AMY levels.

Pancreatic Fat and Body Composition Measurements by Computed Tomography are Associated with Pancreatic Fistula After Pancreatectomy

OBJECTIVES

Postoperative pancreatic fistula (POPF) is the most threatening complication after pancreatectomy. This study aimed to directly assess pancreatic fatty infiltration with preoperative computed tomography (CT) imaging and to investigate whether a preoperative analysis of patient variables, including CT characteristics and clinical factors, can predict POPF.

METHODS

We enrolled 150 consecutive patients who underwent curative pancreatectomy. Radiographic factors, including pancreatic fat volume, were measured using preoperative CT imaging and the predictive factors were explored using univariate and multivariate analyses.

RESULTS

POPF developed in 30 patients (20.0%). The ratio of pancreatic fat (RPF) ≥ 4.83% was associated with a risk of POPF, high body mass index (BMI), and obese body habitus. Patients with POPF were significantly more likely to have high BMI (≥ 25 kg/m²), obese body habitus, and an RPF ≥ 4.83% than patients without POPF. In the multivariate analysis, visceral fat area/skeletal muscle index (VFA/SMI) ≥ 1.94 (odds ratio [OR] 4.28, 95% confidence interval [CI] 1.43-12.9, p = 0.0095) was the sole independent predictive factor for POPF. For patients with a soft pancreas, VFA/SMI ≥ 1.94 (OR 5.67, 95% CI 2.05-15.7, p = 0.0008) was again the sole independent predictive factor for POPF.

CONCLUSION

Preoperative CT images can examine pancreatic fatty infiltration, and patients who had POPF were significantly associated with a high RPF. Among several parameters, VFA/SMI was the only independent predictive factor for clinically relevant POPF. Preoperative evaluation of these body composition variables and the pancreatic configuration could be useful for predicting POPF.

SmartPAN: A novel polysaccharide-microsphere-based surgical indicator of pancreatic leakage

Postoperative pancreatic fistula is a major surgical complication that can follow pancreatic resection. Postoperative pancreatic fistula can develop as a consequence of leaking pancreatic fluid, which calls for an intraoperative indicator of leakage. But suitable indicators of pancreatic leakage have yet to be found. This study details the evidence-based development and early efficacy assessments of a novel pancreatic leakage indicator (SmartPAN), following the IDEAL framework of product development. We developed 41 SmartPAN prototypes by combining indicators of pancreatic fluid with a polysaccharide-microsphere matrix. The prototypes were assessed in vitro using porcine ( Sus scrofa domesticus) pancreatic tissue and ex vivo with human pancreatic fluid. From these initial tests, we chose a hydrogel-based compound that uses the pH indicator bromothymol blue to detect alkali pancreatic fluid. This prototype was then assessed in vivo for usability, effectiveness and reliability using a porcine model. Treatment groups were defined by SmartPAN-reaction at initial pancreatic resection: indicator-positive or negative. Indicator-positive individuals randomly received either targeted closure of leakage sites or no further closure. We assessed SmartPAN’s reliability and effectiveness by monitoring abdominal drainage for amylase and with relaparotomy after 48 h. SmartPAN responses were consistent between both surgical procedures and conformed to amylase measurements. In conclusion, we have developed the first surgery-ready indicator for predicting the occurrence of pancreatic leakage during pancreatic resection. SmartPAN can enable targeted prophylactic closure in a simple and reliable way, and thus may reduce the impact of postoperative pancreatic fistula by guiding peri- and post-operative management.

C-reactive protein and drain amylase accurately predict clinically relevant pancreatic fistula after partial pancreaticoduodenectomy

BACKROUND

C-reactive protein (CRP) and procalcitonin (PCT) have shown to be reliable predictors of inflammatory complications and anastomotic leak after colorectal surgery. Their predictive value after partial pancreaticoduodenectomy (PD) remains unclear.

MATERIALS AND METHODS

All consecutive pancreaticoduodenectomies (2009-2018) at our hospital were included. Drain amylase was evaluated on postoperative day (POD) 1, serum CRP and PCT were evaluated on POD 1-3. Receiver-operating characteristics curves were performed and significant cut-off values were tested using logistic regression.

RESULTS

Among 188 patients who underwent partial PD, clinically relevant pancreatic fistulas (POPF) occurred in 30 (16%) patients, including 20 (10.6%) with Grade B and 10 (5.3%) patients with Grade C. Postoperative complications (Clavien-Dindo ≥ III) were reported in 46 (24.5%) patients, including Grade IIIa in 16 (8.5%), IIIb in 18 (9.6%), IVa in 3 (1.6%), IVb in 2 (1.1%) and V in 7 (3.7%) patients. Drain amylase on POD 1 showed the largest area under the curve (0.872, p < 0.001), followed by CRP (0.803, p < 0.001) and PCT on POD 3 (0.651, p < 0.011). Drain amylase on POD 1 > 303 U/l (OR 0.045, 95% CI 0.010-0.195, p < 0.001), CRP > 203 mg/l (OR 0.098, 95% CI 0.041-0.235, p < 0.001) and PCT > 0.85 μg/l (OR 0.393, 95%CI 0.178-0.869, p = 0.02) were significant predictors of relevant POPF in the univariate analysis. CRP > 203 mg/l (OR 0.098, 95% CI 0.024-0.403, p = 0.001) and drain amylase > 303 U/l (OR 0.064, 95% CI 0.007-0.554, p = 0.01) remained independent predictors in the multivariable analysis. The combination of drain amylase on POD 1 and CRP on POD 3 had a sensitivity and specificity of 87.4% and 90.9% to predict relevant POPF.

CONCLUSION

Drain amylase on POD 1 and CRP on POD 3 can accurately predict clinically relevant POPF after partial pancreaticoduodenectomy. The accuracy of PCT on POD 3 is limited.

The drain fluid amylase level on the first postoperative day predicts pancreatic fistula in chronic pancreatitis patients undergoing Frey procedure

Backgrounds/Aims

Abdominal drains are routinely placed following Frey procedure for chronic pancreatitis (CP) despite the low incidence of pancreatic fistula (PF). The utility of the first postoperative day (POD1) drain fluid amylase (DFA) value in predicting PF in CP patients undergoing Frey procedure has not been previously reported.

Methods

A prospective study of patients with CP who underwent Frey procedure between August 2014 and April 2018. A standard technique of head coring with single layer continuous pancreatojejunostomy was done in all the patients. Amylase level of the drain placed close to the pancreatojejunostomy was recorded on POD1 and 3. Postoperative PF was defined and graded as per the updated International Study Group of Pancreatic Fistula (ISGPF) guidelines.

Results

Fifty-five patients with CP who fulfilled the inclusion criteria were included in the study. All had normal preoperative serum amylase level. Three patients developed a biochemical leak and four patients developed postoperative PF (Grade B - 3 and Grade C - 1). Receiver operating characteristics (ROC) curve identified a POD1 DFA cut-off value of 326 U/L that predicted a postoperative PF with sensitivity, specificity and negative predictive value of 100%, 70%, and 100% respectively.

Conclusions

The POD1 DFA is a reliable predictor of postoperative PF in CP patients who have undergone Frey procedure. The PF can be confidently excluded in patients who have a POD1 DFA less than 326 U/L.

Identification of an Optimal Cut-off for Drain Fluid Amylase on Postoperative Day 1 for Predicting Clinically Relevant Fistula After Distal Pancreatectomy: A Multi-institutional Analysis and External Validation

OBJECTIVE

The aim of this study was to investigate the relationship between drain fluid amylase value on the first postoperative day (DFA1) and clinically relevant fistula (CR-POPF) after distal pancreatectomy (DP), and to identify the cut-off of DFA1 that optimizes CR-POPF prediction.

BACKGROUND

DFA1 is a well-recognized predictor of CR-POPF after pancreatoduodenectomy, but its role in DP is largely unexplored.

METHODS

DFA1 levels were correlated with CR-POPF in 2 independent multi-institutional sets of DP patients: developmental (n = 338; years 2012 to 2017) and validation cohort (n = 166; years 2006 to 2016). Cut-off choice was based on Youden index calculation, and its ability to predict CR-POPF occurrence was tested in a multivariable regression model adjusted for clinical, demographic, operative, and pathological variables.

RESULTS

In the developmental set, median DFA1 was 1745 U/L and the CR-POPF rate was 21.9%. DFA1 correlated with CR-POPF with an area under the curve of 0.737 (P < 0.001). A DFA1 of 2000 U/L had the highest Youden index, with 74.3% sensitivity and 62.1% specificity. Patients in the validation cohort displayed different demographic and operative characteristics, lower values of DFA1 (784.5 U/L, P < 0.001), and reduced CR-POPF rate (10.2%, P < 0.001). However, a DFA1 of 2000 U/L had the highest Youden index in this cohort as well, with 64.7% sensitivity and 75.8% specificity. At multivariable analysis, DFA1 ≥2000 U/L was the only factor significantly associated with CR-POPF in both cohorts.

CONCLUSION

A DFA1 of 2000 U/L optimizes CR-POPF prediction after DP. These results provide the substrate to define best practices and improve outcomes for patients receiving DP.

Defining the practice of distal pancreatectomy around the world

BACKGROUND

Best management practices for distal pancreatectomy (DP) have not been conclusively defined. The aim of this study was to analyze the practice of DP worldwide and to compare surgeons' behavior with the best available evidence.

METHODS

A survey assessing management approaches for DP was distributed worldwide, in eight native-language translations. Regions were clustered: North-America, South/Central America, Asia/Australia, and Europe/Africa/Middle East.

RESULTS

Overall, 721/797 (91%) responding surgeons (median age = 48; years of experience = 14) indicated their region, representing six continents and 68 nations. Use of minimally-invasive (MI) techniques is diverse-highest in North-America (p < 0.001). Laparoscopy is the most common MI approach, while robotic techniques are rarely performed outside North-America. The preferred means of pancreatic remnant closure is via stapler - more commonly applied in North-America than in Europe/Africa/Middle East. Management techniques for the remnant and other fistula mitigation strategies display significant regional variability. The use of drains is also diverse, with the biggest disparity between North-American and Asian/Australian surgeons (selective and routine drainers, respectively).

CONCLUSION

There is wide heterogeneity in practices for DP worldwide, which is influenced by the surgeon's region of practice. Variability in practice reflects the lack of solid evidence on the benefit of any given strategy, underlining areas for improvement.

Validation of early drain removal after pancreatoduodenectomy based on modified fistula risk score stratification: a population-based assessment

BACKGROUND

Recent studies on postoperative pancreatic fistula (POPF) prevention following pancreatoduodenectomy (PD) have proposed omission of perioperative drains for negligible/low-risk patients and early drain removal (≤POD3) for intermediate/high-risk patients with POD1 drain amylase levels of ≤5000 U/L, though this has not been validated using a nationwide cohort.

METHODS

The ACS-NSQIP targeted pancreatectomy database from 2014 to 2016 was queried to identify patients who underwent PD. Patients with POD1 drain amylase levels of ≤5000 U/L were initially stratified as negligible/low- or intermediate/high-risk based on a previously validated modified fistula risk score (mFRS). Differences in relevant postoperative outcomes were then compared among patients who underwent early (≤POD3) vs. late (≥POD4) drain removal.

RESULTS

Among 1825 patients who underwent PD, 1540 (84%) had POD1 drain amylase of ≤5000 U/L: 719 (47%) high-risk and 821 (53%) low-risk. Among high-risk patients, early drain removal (n = 205, 29%) was associated with lower rates of POPF (3% vs. 18%, p < 0.001), clinically relevant (CR)-POPF (2% vs. 15%, p < 0.001), overall morbidity (27% vs. 47%, p < 0.001), serious morbidity (15% vs. 24%, p = 0.007) and hospital length of stay (LOS, 7 vs. 8 days, p < 0.001). Similarly, early drain removal in low-risk patients (n = 273, 33%) was associated with decreased rates of POPF (1% vs. 6%, p = 0.003), CR-POPF (1% vs. 5%, p = 0.014), overall morbidity (28% vs. 41%, p = 0.0003), serious morbidity (8% vs. 14%, p = 0.015) and LOS (6 vs. 8 days, p < 0.001). On multivariate logistic regression analysis, early drain removal remained associated with significantly decreased odds of POPF, CR-POPF, overall and serious morbidity as well as LOS among both high- and low-risk patients (all p < 0.05).

CONCLUSIONS

Among patients with POD1 drain amylase ≤5000 U/L following PD, early drain removal (≤POD3) is associated with improved postoperative outcomes among both high- and low-risk patients. Early drain removal based on POD1 drain amylase is indicated regardless of mFRS.

The role of abdominal drainage in pancreatic resection - A multicenter validation study for early drain removal

BACKGROUND

Abdominal drainage and the timing of drain removal in patients undergoing pancreatic resection are under debate. Early drain removal after pancreatic resection has been reported to be safe with a low risk for clinical relevant postoperative pancreatic fistula (CR-POPF) when drain amylase on POD1 is < 5000U/L. The aim of this study was to validate this algorithm in a large national cohort.

METHODS

Patients registered in the Dutch Pancreatic Cancer Audit (2014-2016) who underwent pancreatoduodenectomy, distal pancreatectomy or enucleation were analysed. Data on post-operative drain amylase levels, drain removal, postoperative pancreatic fistulae were collected. Univariate and multivariate analysis using a logistic regression model were performed. The primary outcome measure was grade B/C pancreatic fistula (CR-POPF).

RESULTS

Among 1402 included patients, 433 patients with a drain fluid amylase level of <5000U/L on POD1, 7% developed a CR-POPF. For patients with an amylase level >5000U/L the CR-POPF rate was 28%. When using a cut-off point of 2000U/L or 1000U/L during POD1-3, the CR-POPF rates were 6% and 5% respectively. For patients with an amylase level of >2000U/L and >1000UL during POD 1-3 the CR-POPF rates were 26% and 22% respectively (n = 223). Drain removal on POD4 or thereafter was associated with more complications (p = 0.004). Drain amylase level was shown to be the most statistically significant predicting factor for CR-POPF (Wald = 49.7; p < 0.001).

CONCLUSION

Our data support early drain removal after pancreatic resection. However, a cut-off of 5000U/L drain amylase on POD1 was associated with a relatively high CR-POPF rate of 7%. A cut-off point of 1000U/L during POD1-3 resulted in 5% CR-POPF and might be a safer alternative.

Clinical Implications of the 2016 International Study Group on Pancreatic Surgery Definition and Grading of Postoperative Pancreatic Fistula on 775 Consecutive Pancreatic Resections

OBJECTIVE

The aim of the present study was to evaluate the clinical implications of the 2016 International Study Group for Pancreatic Surgery (ISGPS) definition and classification of postoperative pancreatic fistula (POPF) using a single high-volume institutional cohort of patients undergone pancreatic surgery.

BACKGROUND

The ISGPS definition and grading system of POPF has been recently updated. Although the rationale for the changes was supported by previous studies, the effect of the new definition and classification scheme on surgical series has not been established.

METHODS

A total of 775 patients undergone pancreatic surgery in our institute from 2013 to 2015 were reviewed. The parameters modified in the ISGPS classification were analyzed according to postoperative outcomes. Finally the classification was validated by external clinical and economical outcomes.

RESULTS

Applying the 2016 scheme, 17.5% of patients changed classification group compared to the 2015 system. Grade B increased from 11.5% to 22.1%, whereas grade C decreased from 15.2% to 4.6%. Biochemical leak occurred in 7% of patients, and it did not differ from the non-POPF condition in terms of surgical outcomes. Non-POPF group, grades B and C POPF differed significantly in terms of intensive care unit staying (P < 0.001), length of stay (P < 0.001), readmission rate (P < 0.001), and hospital costs (P < 0.001).

CONCLUSIONS

The present study has confirmed the pertinence of the changes introduced in the 2016 ISGPS POPF definition and grading. This updated classification is effective in identifying three conditions that differ in terms of clinical and economic outcomes. These results suggested the reliability of the new definition and scheme in classifying POPF-related outcomes.

A Combination of Robotic Approach and ERAS Pathway Optimizes Outcomes and Cost for Pancreatoduodenectomy

OBJECTIVE

To determine the impact of enhanced recovery after surgery (ERAS) pathway implementation on outcomes, and cost of robotic and open pancreatoduodenectomy.

BACKGROUND

ERAS pathways have shown benefit in open pancreatoduodenectomy (OPD). The impact of ERAS on robotic pancreatoduodenectomy (RPD) is unknown.

METHODS

Retrospective review of consecutive RPD and OPDs in the pre-ERAS (July, 2014-July, 2015) and ERAS (July, 2015-July, 2016) period. Univariate and multivariate logistic regression was used to determine impact of ERAS and operative approach alone, or in combination (pre-ERAS + OPD, pre-ERAS + RPD, ERAS + OPD, ERAS + RPD) on length of hospital stay (LOS) and overall cost.

RESULTS

In all, 254 consecutive pancreatoduodenectomies (RPD 62%, OPD 38%) were analyzed (median age 67, 47% female). ERAS patients had shorter LOS (6 vs 8 days; P = 0.004) and decreased overall cost (USD 20,362 vs 24,277; P = 0.001) compared with non-ERAS patients, whereas RPD was associated with decreased LOS (7 vs 8 days; P = 0.0001) and similar cost compared with OPD. On multivariable analysis (MVA), RPD was predictive of shorter LOS [odds ratio (OR) 0.33, confidence interval (CI) 0.16-0.67, P = 0.002), whereas ERAS was protective against high cost (OR 0.57, CI 0.33-0.97, P = 0.037). On MVA, when combining operative approach with ERAS pathway use, a combined ERAS + RPD approach was associated with reduced LOS and optimal cost compared with other combinations (pre-ERAS + OPD, pre-ERAS + RPD, ERAS + OPD).

CONCLUSION

ERAS implementation is independently associated with cost savings for pancreatoduodenectomy. A combination of ERAS and robotic approach synergistically decreases hospital stay and overall cost compared with other strategies.

Effect of Blumgart anastomosis in reducing the incidence rate of pancreatic fistula after pancreatoduodenectomy

BACKGROUND

Pancreatic fistula is one of the most serious complications after pancreatoduodenectomy for treating any lesions at the pancreatic head. For years, surgeons have tried various methods to reduce its incidence.

AIM

To investigate and emphasize the clinical outcomes of Blumgart anastomosis compared with traditional anastomosis in reducing postoperative pancreatic fistula.

METHODS

In this observational study, a retrospective analysis of 291 patients who underwent pancreatoduodenectomy, including Blumgart anastomosis (201 patients) and traditional embedded pancreaticojejunostomy (90 patients), was performed in our hospital. The preoperative and perioperative courses and long-term follow-up status were analyzed to compare the advantages and disadvantages of the two methods. Moreover, 291 patients were then separated by the severity of postoperative pancreatic fistula, and two methods of pancreaticojejunostomy were compared to detect the features of different anastomosis. Six experienced surgeons were involved and all of them were proficient in both surgical techniques.

RESULTS

The characteristics of the patients in the two groups showed no significant differences, nor the preoperative information and pathological diagnoses. The operative time was significantly shorter in the Blumgart group (343.5 ± 23.0 vs 450.0 ± 40.1 min, P = 0.028), as well as the duration of pancreaticojejunostomy drainage tube placement and postoperative hospital stay (12.7 ± 0.9 d vs 17.4 ± 1.8 d, P = 0.031; and 21.9 ± 1.3 d vs 28.9 ± 1.3 d, P = 0.020, respectively). The overall complications after surgery were much less in the Blumgart group than in the embedded group (11.9% vs 26.7%, P = 0.002). Patients who underwent Blumgart anastomosis would suffer less from severe pancreatic fistula (71.9% vs 50.0%, P = 0.006), and this pancreaticojejunostomy procedure did not have worse influences on long-term complications and life quality. Thus, Blumgart anastomosis is a feasible pancreaticojejunostomy procedure in pancreatoduodenectomy surgery. It is safe in causing less postoperative complications, especially pancreatic fistula, and thus shortens the hospitalization duration.

CONCLUSION

Surgical method should be a key factor in reducing pancreatic fistula, and Blumgart anastomosis needs further promotion.

Has the pancreatic fistula already occurred in the operation? An intraoperative predictive factor of clinical relevant-postoperative pancreatic fistula after the distal pancreatectomy

Purpose

The aim of this study was to assess the predictive effect of intraoperative amylase value from pancreatic remnant on the development of clinical relevant-postoperative pancreatic fistula after distal pancreatectomy.

Methods

Patients undergoing distal pancreatectomy between June 2017 and October 2018 were studied retrospectively. The intraoperative amylase value was measured followed by drain fluid for amylase on postoperative day 3. The analysis of clinical relevant-postoperative pancreatic fistula predictors was carried out using the logistic regression. The receiver operating characteristic analysis was performed to evaluate the discriminative capacity of intraoperative amylase value as a predictive risk factor.

Results

The study population consisted of 40 patients. The clinical relevant-postoperative pancreatic fistula occurred in 13 patients, no grade C pancreatic fistula (PF). The intraoperative amylase value correlated significantly with clinical relevant-postoperative pancreatic fistula. An intraoperative amylase value > 3089 U/L was proposed as the cut-off level to predict clinical relevant-postoperative pancreatic fistula by the receiver operating characteristic curve. The sensitivity, specificity and accuracy of this level were respectively 84.6%, 88.9% and 88.5%. The multivariate logistic regression analysis revealed that intraoperative amylase value and suture closure for the pancreatic stump were the significant predictive risk factors for the clinical relevant-postoperative pancreatic fistula.

Conclusion

The intraoperative amylase value can be early and easily measured as a predictive risk factor, which seems useful for postoperative management of clinical relevant-postoperative pancreatic fistula after distal pancreatectomy. While, the stapler closure might be a feasible way for the pancreatic transection during the operation.

Natural history and therapeutic strategies of post-pancreatoduodenectomy abdominal fluid collections: Ten-year experience in a single institution

TRIAL DESIGN

The aim of this study was to identify independent risk factors for post-pancreatoduodenectomy (post-PD) abdominal fluid collections (AFCs) and evaluate our management protocol on it.

METHODS

A retrospective analysis of consecutive 2064 cases who underwent PD over the past decade in 1 single center was conducted. The patients were divided into AFCs and non-AFCs group. Univariable and multivariate logistic regression analysis was performed to identify independent risk factors of AFCs. The AFCs group was compared with the non-AFCs group with respect to the incidence of postoperative outcomes. The characteristics of AFCs were further analyzed in terms of clinical manifestations.

RESULTS

Two thousand sixty-four cases with pancreaticoduodenectomy were recruited and 15% of them were found AFCs. Diameter of main pancreatic duct ≤3 mm was found to be an independent predictor of AFCs (P < .001), along with soft pancreatic texture (P = .002), mesenterico-portal vein resection (P < .001), and estimated intraoperative blood loss >800 mL (P < .001). The incidence of mild complications was significantly higher in AFCs group than in non-AFCs group (34% vs 20%, P < .001), whereas no significant differences were noted in the rate of severe complications between these 2 groups (15% vs 15%, P = .939).

CONCLUSION

Enhanced drainage is recommended as an effective measure to decrease the incidence of severe complications caused by post-PD AFCs.

Postoperative Pancreatic Swelling Predicts Pancreatic Fistula after Pancreaticoduodenectomy

Postoperative pancreatic fistula (POPF) is a serious complication of pancreaticoduodenectomy. However, the criteria for prompting drainage have not been clarified yet. We evaluated 80 patients who underwent pancreaticoduodenectomy between 2011 and 2016. Clinically relevant POPF (International Study Group of Postoperative Pancreatic Fistula grade B or C) was evaluated on the basis of the following parameters: changes in pancreatic thickness between preoperation and postoperative day (POD) 4 identified via enhanced CT, drain amylase level, laboratory data, and operative factors. POPF occurred in 21 patients (26.3%). The median change in pancreatic thickness before and after operation was 8.33 mm in the POPF-positive group, which was significantly larger than that in the POPF-negative group (3.79 mm, P <0.001). In addition, operation time, pancreatic texture, main pancreatic duct diameter, WBC count, C-reactive protein level, and drain amylase level demonstrated significant differences between the groups. In the multivariate analysis, operation time, C-reactive protein level on POD 3, drain amylase level on POD 1, and the change in pancreatic thickness before and after operation were independent risk factors of POPF. The drastic change in pancreatic thickness before and after operation predicted POPF in this study. This might be one of the factors that determine the requirement for drainage.

Assessment of acute obstructive pancreatitis by magnetic resonance imaging: Predicting the occurrence of pancreatic fistula following pancreatoduodenectomy

The aim of the present study was to assess the effect of preoperative acute obstructive pancreatitis on the risk of the occurrence of pancreatic fistula (PF) following pancreaticoduodenectomy. A total of 22 patients who developed postoperative PF were carefully matched with 22 control patients without PF according to demographic data, pancreatic pathology, presenting symptoms and other surgery-associated parameters. These parameters were compared between these two groups. The mean pancreatic apparent diffusion coefficient (ADC) values in the fistula group were 1.14±0.31×10^-3 mm²/s, which was significantly decreased compared with the non-fistula group (1.48±0.44×10^-3 mm²/s) (P=0.005). The pancreas-muscle signal intensity (SI) ratio on fat-suppressed T1 weighted image (rT1) in the fistula group was 1.71±0.25, which was significantly increased compared with the non-fistula group (1.25±0.29) (P<0.001). The pancreas-muscle SI ratios on fat-suppressed T2 weighted image (T2WI) in the fistula group and the non-fistula group were 0.72±0.08 and 0.62±0.07, respectively (P=0.79). There was no significant difference in pancreas-muscle SI ratio on fat-suppressed T2-weighted image (rT2) value between these two groups. Based on the receiver operating characteristic curve, the optimal cut-off value of ADC as a criterion for prediction of pancreatic fistula was 1.29×10^-3 mm²/s, which yielded a sensitivity of 77.3% and a specificity of 63.6%. In conclusion, the severity of acute obstructive pancreatitis was negatively associated with ADC values and pancreas-muscle SI ratio on rT1 images, which may be useful for predicting the occurrence of PF preoperatively.

Bacterial smear test of drainage fluid after pancreaticoduodenectomy can predict postoperative pancreatic fistula

OBJECTIVES

It is widely accepted that postoperative pancreatic fistula (POPF) accompanied by bacterial infection results in a worse outcome than POPF alone. However, few studies evaluating predictive indicators of POPF have focused on bacterial infection.

METHODS

A consecutive 100 patients who underwent pancreaticoduodenectomy at our institute for periampullary disease were enrolled. POPF was assessed according to the International Study Group of Pancreatic Fistula consensus guidelines; grades B and C were defined as clinically relevant POPF (CR-POPF). The patients' characteristics, perioperative surgical factors, and laboratory data including the results of culture and smear testing performed using drainage fluid on postoperative days (PODs) 1 and 3 were analyzed.

RESULTS

The overall incidence of CR-POPF was 25%. Univariate analyses revealed that the factors associated with CR-POPF were male sex, soft pancreas, MPD diameter, higher serum C-reactive protein concentration and white blood cell count on POD 3, higher amylase concentration in drainage fluid, and culture and/or smear positivity of drainage fluid. Multivariate analysis newly revealed that the smear positivity of drainage fluid on POD 3 was the independent risk factors for CR-POPF (p = 0.027).

CONCLUSIONS

Smear positivity of drainage fluid on POD 3 after pancreaticoduodenectomy may be a new predictor of CR-POPF.

Evidence Versus Practice in Early Drain Removal After Pancreatectomy

BACKGROUND

Early drain removal when postoperative day (POD) one drain fluid amylase (DFA) was ≤5000 U/L reduced complications in a previous randomized controlled trial. We hypothesized that most surgeons continue to remove drains late and this is associated with inferior outcomes.

METHODS

We assessed the practice of surgeons in a prospectively maintained pancreas surgery registry to determine the association between timing of drain removal with demographics, comorbidities, and complications. We selected patients with POD1 DFA ≤5000 U/L and excluded those without drains, and subjects without data on POD1 DFA or timing of drain removal. Early drain removal was defined as ≤ POD5.

RESULTS

Two hundred and forty four patients met inclusion criteria. Only 90 (37%) had drains removed early. Estimated blood loss was greater in the late removal group (190 mL versus 100 mL, P = 0.005) and pathological findings associated with soft gland texture were more frequent (97 [63%] versus 35 [39%], P < 0.0001). Patients in the late drain removal group had more complications (84 [55%] versus 30 [33%], P = 0.001) including pancreatic fistula (55 [36%] versus 4 [4%], P < 0.0001), delayed gastric emptying (27 [18%] versus 3 [3%], P = 0.002), and longer length of stay (7 d versus 5 d, P < 0.0001). In subset analysis for procedure type, complications and pancreatic fistula remained significant for both pancreatoduodenectomy and distal pancreatectomy.

CONCLUSIONS

Despite level one data suggesting improved outcomes with early removal when POD1 DFA is ≤ 5000 U/L, experienced pancreas surgeons more frequently removed drains late. This practice was associated with known risk factors (estimated blood loss, soft pancreas) and may be associated with inferior outcomes suggesting potential for improvement.

Evolving the Paradigm of Early Drain Removal Following Pancreatoduodenectomy

BACKGROUND

Recent data illustrates improved outcomes when adhering to early drain removal following pancreatoduodenectomy (PD). This study aims to explore the potential benefits of expanding the timeframe for early drain removal.

METHODS

Six hundred forty PDs were originally managed by selective drain placement and early removal. Outcomes were reappraised in the framework of a novel proposal; intraoperative drains were omitted based on a low-risk profile (Fistula Risk Score 0-2), followed by drain removal at PODs 1, 3, and 5 if drain fluid amylase (DFA) fell below specific cutoffs based on optimized negative predictive values (NPV) for clinically relevant postoperative pancreatic fistula (CR-POPF). Characteristics of the remaining cohort with drains in situ on POD5 were examined using multivariable analysis (MVA).

RESULTS

Intraoperative FRS would preclude drains from 230 (35.9%) negligible/low-risk cases with a cohort CR-POPF rate of 1.7%. Of the remaining patients, 30.5% would have drains removed on POD1 based on a DFA threshold of 300 IU/L (NPV = 98.4%), demonstrating a 1.6% CR-POPF rate. On POD3, drains could be removed in the residual cohort from 21.1% of patients with DFA ≤ 150 IU/L (NPV = 96.6%), reflecting a 3.4% CR-POPF rate. On POD5, a DFA threshold of 50 IU/L (NPV = 84%) identified 16.3% more patients whose drains could be removed. The remaining cohort (POD5 DFA > 50 IU/L), "enriched" for fistula development and reflecting just 18.4% of the original patients, displays a 61% CR-POPF rate. Among these patients on POD5, a DFA threshold > 2000 IU/L best predicted subsequent CR-POPF (PPV = 89.5%), and MVA revealed a positive association between pancreatic cancer/pancreatitis (OR = 4.37, p = 0.022) and longer operations (OR = 3.74, p = 0.014) with CR-POPF development.

CONCLUSION

Early drain removal is a dynamic concept and can be employed throughout the postoperative time course using conditional thresholds to better identify patients at risk for CR-POPF.

Predictive value of post-operative drain amylase levels for post-operative pancreatic fistula

Backgrounds/Aims

Traditionally, surgically placed pancreatic drains are removed, at the discretion of the operating surgeon. Moving towards enhanced recovery after surgery (ERAS), we looked for predictors for early drain removal. The purpose of this paper was to establish which postoperative days' (POD) drain amylase is most predictive against post-operative pancreatic fistula (POPF).

Methods

We conducted a retrospective study of 196 patients who underwent pancreatic resection at our institute from January 2006 to October 2013. Drain amylase levels were routinely measured. The International Study Group of Pancreatic Fistula (ISGPF) definition of POPF, and clinical severity grading were used.

Results

5.1% (10 of 196) patients developed ISGPF Grades B and C POPF. Negative predictive value of developing significant POPF, if drain amylase values were low on PODs 1 and 3 was 98.7% (95% CI: 0.93-1.00). This translated to confidence in removing surgically placed pancreatic drains, at POD 1 and 3 when drain amylase values are low.

Conclusions

Patients with low drain amylase values on POD 1 and 3, are unlikely to develop POPF and may have pancreatic drains removed earlier.

Dual-center randomized clinical trial exploring the optimal duration of antimicrobial prophylaxis in patients undergoing pancreaticoduodenectomy following biliary drainage

OBJECTIVES

The aim of this dual-center randomized controlled trial was to determine the optimal duration of antimicrobial prophylaxis in patients treated with pancreaticoduodenectomy (PD) who underwent preoperative biliary drainage (PBD) but were without cholangitis.

BACKGROUND

Some reports showed that PBD in patients undergoing pancreatectomy increased the rate of perioperative complications. However, no clinical trial has evaluated the optimal duration of antimicrobial prophylaxis with a focus on patients who underwent PD following PBD.

METHODS

A total of 82 patients who underwent PD between March 2012 and December 2016 were randomly assigned to either a 1-day group (n = 40), in which cefozopran (CZOP) as antimicrobial prophylaxis was given only on the day of surgery, or a 5-day group (n = 42), in which CZOP was given for 5 consecutive days beginning on the day of surgery. We evaluated the incidence of infectious and other complications after PD.

RESULTS

Outcomes were significantly better in the 1-day group compared with the 5-day group (P < 0.05) in terms of the incidence of overall infectious complications (15% vs 36%, respectively), intra-abdominal abscess (3% vs 21%, respectively), clinically relevant postoperative pancreatic fistula (8% vs 24%, respectively), and Clavien-Dindo grade III-V complications (10% vs 31%, respectively). Duration of postoperative hospital stay was significantly shorter in the 1-day group (10 days vs 15 days, P = 0.018). Anaerobic bacteria and methicillin-resistant cocci were isolated from the drainage fluid only among patients in the 5-day group.

CONCLUSION

Single-day prophylactic use of CZOP is appropriate for patients who undergo PD following PBD without preoperative cholangitis.

Polyester sutures for pancreaticojejunostomy protect against postoperative pancreatic fistula: a case-control, risk-adjusted analysis

BACKGROUND

There is wide variability in the use of suture material for pancreatic anastomosis after pancreaticoduodenectomy (PD). This study evaluates the role of suture material on clinically relevant postoperative pancreatic fistula (CR-POPF) after pancreaticojejunostomy (PJ) in a risk-adjusted setting.

METHODS

A retrospective study comparing (polyester) PE with polydioxanone (PDO) in 520 PDs. Patients were matched for risk for CR-POPF according to the fistula risk score (FRS) with the propensity score.

RESULTS

The matched PE and PDO groups consisted of 232 patients. The incidence of CR-POPF was lower for PE group (11.6 vs. 22%, p<0.01), with a lower rate of grade B (10.3 vs. 15.5%, p<0.01) and C (1.3 vs. 6.5%, p<0.01). After stratifying by fistula risk zone, PE suture remained associated with a reduced incidence of CR-POPF (9.4 vs. 15.6% low-, p = 0.04; 15.6 vs. 28.1% intermediate-, p = 0.02; 16.7 vs. 83.3% high-risk zone, p<0.01, respectively). Multivariable analysis demonstrated that pancreatic texture, preoperative diagnosis, FRS and the use of PE sutures were independent predictors of CR-POPF.

CONCLUSIONS

In the setting of a case-control matched for risk analysis, the use of PE suture for PJ is associated with a significant reduction of CR-POPF.

Perioperative Net Fluid Balance Predicts Pancreatic Fistula After Pancreaticoduodenectomy

BACKGROUND

Our goal was to evaluate the relationship between perioperative fluid administration and the development of clinically relevant postoperative pancreatic fistula (CR-POPF) after pancreaticoduodenectomy (PD).

METHODS

Retrospectively, we analyzed fluid balance over the first 72 h in 104 consecutive patients who underwent PD between 2013 and 2017. Patients were categorized into tertiles (low, medium, and high) by net fluid balance.

RESULTS

POPF was identified in 17.3% of patients (n = 18). No significant demographic differences were identified among tertiles. Similarly, there were no differences in ASA, smoking status, hemoglobin A1C, pathologic findings, operative time, blood loss, intraoperative fluid administration, use of pancreatic stents, use of epidurals, or postoperative lactate. Patients with high 72-h net fluid balance had significantly increased rates of POPF compared with those in the medium and low tertiles (31.4% vs. 11.4% vs. 8.8%, p = 0.02). On multivariate analysis, increasing net fluid balance remained associated with CR-POPF (OR 1.26, CI 1.03-1.55, p = 0.03).

CONCLUSION

High net 72-h fluid balance is an independent predictor of POPF after PD. Given ongoing efforts to minimize PD morbidity, net fluid balance may represent a clinical predictor and, possibly, a modifiable target for prevention of POPF.