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HOME > Clin Endosc > Volume 51(3); 2018 > Article
Original Article Pancreatic Necrosectomy through Sinus Tract Endoscopy
Mahesh Kumar Goenka1,orcid, Usha Goenka2, Md.Yasin Mujoo1, Indrajit Kumar Tiwary1, Sanjay Mahawar1, Vijay Kumar Rai1
Clinical Endoscopy 2018;51(3):279-284.
DOI: https://doi.org/10.5946/ce.2017.066
Published online: January 4, 2018

1Institute of Gastrosciences, Apollo Gleneagles Hospitals, Kolkata, India

2Department of Clinical Imaging and Interventional Radiology, Apollo Gleneagles Hospitals, Kolkata, India

Correspondence: Mahesh Kumar Goenka Institute of Gastrosciences, Apollo Gleneagles Hospitals, 58 Canal Circular Road, Kolkata 700054, India Tel: +91-33-2320-3040, Fax: +91-33-2320-5218, E-mail: mkgkolkata@gmail.com
• Received: May 6, 2017   • Revised: July 19, 2017   • Accepted: September 13, 2017

Copyright © 2018 Korean Society of Gastrointestinal Endoscopy

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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See letter "Is Percutaneous Endoscopic Necrosectomy Really Safe and Effective for Symptomatic Laterally Placed Walled-off Necrosis?" in Volume 51 on page 213.
  • Background/Aims
    Direct endoscopic pancreatic necrosectomy is increasingly being utilized to treat infected or symptomatic walled-off necrosis (WON) located close to the stomach or duodenum. Laterally-placed WON has traditionally been treated surgically. We evaluated a less utilized technique of sinus tract endoscopy (STE) for symptomatic laterally-placed WON.
  • Methods
    Two hundred seventy-six patients with acute pancreatitis admitted in our hospital, 32 had symptomatic or infected WON requiring intervention. Of the 12 patients with laterally placed WON, 10 were treated by STE. STE was performed with a standard adult gastroscope passed through a percutaneous tract created by the placement of a 32-Fr drain.
  • Results
    Ten patients (7 males; mean age, 43.8 years) underwent STE. Mean number of sessions was 2.3 (range, 1–4), with mean time of 70 minutes for each session (range, 15–70 minutes). While 9 patients had complete success, 1 patient had fever and chose to undergo surgery. Two patients developed pneumoperitoneum, which was treated conservatively. There was no mortality, cutaneous fistula, or recurrence during follow-up.
  • Conclusions
    Laterally placed WON can be successfully managed by STE performed through a percutaneously placed drain. Details of the technique and end-points of STE require further evaluation.
  • Keywords: Walled-off necrosis; Pancreatitis, acute necrotizing; Sinus tract endoscopy; Necrosectomy
Most patients with acute pancreatitis have mild disease and recover without any sequelae. However, acute necrotizing pancreatitis is often associated with significant morbidity and mortality, which can vary from 10% to 40% depending on the extent of pancreatic necrosis and the presence or absence of infection [1-8].
With a better understanding of the pathophysiology and natural history of severe acute pancreatitis, many patients with infected pancreatic necrosis are being treated non-surgically [9-16]. Endoscopic drainage of walled-off necrosis (WON), either by placement of stents or by direct endoscopic necrosectomy (DEN), is being increasingly used [9-13]. Because of its higher success rate, lower morbidity and mortality, and shorter hospital stay, DEN is now considered an intervention of choice for WON that is centrally located, i.e., close to the stomach or duodenum [9-13]. Laterally placed WON, which is distant from the stomach or duodenum [14], cannot be approached through the gastroduodenal lumen and has traditionally been treated by surgery. In this observational, cross-sectional study, we report our experience of treating laterally placed WON by endoscopic necrosectomy through a sinus tract created percutaneously.
Patient cohort
A total of 276 patients with acute pancreatitis were admitted in our institute during a period of 3 years (January 2014 to December 2016). Of these, 186 were admitted early in their clinical course (within 5 days of diagnosis), and 90 were transferred to our care due to non-resolution of symptoms or development of complications. A total of 172 patients were diagnosed with acute necrotizing pancreatitis on the basis of computed tomography (CT). As shown in Fig. 1, 48 patients were diagnosed with WON, and 32 had indications for intervention due to sepsis, abdominal pain, or vomiting. Of these 32 patients, 20 had centrally placed WON, 9 had laterally placed WON, and 3 had both central and lateral WON. Laterally placed WON was defined as one located lateral to the stomach and duodenum, with at least 2 cm distance between the WON and the wall of the stomach or duodenum [14]. Endoscopic necrosectomy was offered to all 32 patients, but only 26 patients, including 10 of 12 with laterally placed WON, gave their consent. These 10 patients were subjected to sinus tract endoscopy (STE). The study was approved by the Institutional Review Board.
Technique of sinus tract endoscopy
Once a decision was made to perform STE, the radiologist (UG) placed a percutaneous drainage catheter with CT guidance under local anesthesia. After deciding the point of entry and a safe track, a small skin incision was made and the track was dilated using arterial forceps. A trocar drain was then positioned. A 32-Fr catheter was placed in 8 patients at the initial session, while 2 patients initially had a drain of smaller size that was subsequently replaced by a 32-Fr catheter. STE was carried out at least 10 days after the placement of the 32-Fr catheter in order to allow the tract wall to mature.
STE was performed under fluoroscopic guidance with intravenous propofol anesthesia in the presence of an anesthetist (IKT and SM). A pediatric gastroscope (GIFXP 160; Olympus Co., Tokyo, Japan) with an outer diameter of 5.9 mm was first passed through the drain tube for initial assessment. The drain catheter was then removed, and an adult gastroscope (GIF 160/180/190; Olympus Co.) with an outer diameter of approximately 9 mm was introduced carefully into the necrotic cavity under fluoroscopic control. This procedure was performed with carbon dioxide insufflation. The liquid content of WON was aspirated, and the cavity was lavaged with sterile normal saline, which was also sucked out. Necrotic tissue was removed using various endoscopic accessories such as rat-tooth forceps, Roth basket, polypectomy snare, and Dormia basket. Both necrotic materials lying free in the cavity as well as attached to the wall were extracted by gently pulling on the tissue.
The first session was terminated after all loose tissues were removed and the attempt to remove attached necrotic tissue failed or initiated mild ooze. About 100 mL of hydrogen peroxide (diluted 3 times with saline) was instilled into the cavity at the end of the procedure, and a 32-Fr catheter was reintroduced through the sinus tract into the cavity under fluoroscopic guidance. The procedure was repeated at an interval of 2–5 days until the end-point was reached. The primary outcome was clinical success, defined as control of symptoms associated with near complete clearance of necrotic tissue and visualization of healthy granulation tissue lining the wall of the cavity. Other outcome parameters included technical procedural success and adverse effects. The drainage tube was kept in place until the output was less than 10 mL/day and was then withdrawn. Fig. 2 illustrates a patient undergoing STE. Antibiotics were continued until the drain tube was removed. Follow-up CT was performed in 7 patients. None of the patients underwent endoscopic retrograde cholangiopancreatography (ERCP).
A total of 10 patients underwent STE for pancreatic necrosectomy. The indication for drainage was infection in 6 patients and significant pain in 4 patients. Table 1 gives the details of these 10 patients along with their outcomes. The mean age of the patients in this series was 43.8 years (range, 29 to 55 years) with a male:female ratio of 7:3. The follow-up period was 3 to 12 months. Pancreatitis was caused by a gall-stone in 4 patients, alcohol in 3, trauma in 1, and unknown reasons in 2. The overall mean CT severity index was 8 (range, 6–10) (Table 1). The size of WON varied from 4 to 12 cm (mean 7.2 cm). Only 3 patients had organ failure (respiratory) requiring support. All patients received intensive medical care including antimicrobial agents, nutritional support, and pain therapy.
Primary treatment outcome
The number of STE sessions required by these 10 patients varied from 1 to 4 (mean 2.3, median 2), and the time required for each session varied from 15 to 70 minutes (mean 45 minutes). Two patients with central WON underwent additional necrosectomy through the stomach, using a lumen-apposing metal stent placed at endoscopy. The hospital stay ranged from 18 to 44 days (mean 24.7 days). Nine patients (90%) had complete resolution of symptoms and required no further interventions. However, 1 patient with continuing fever in spite of 2 sessions of STE chose to have surgery, which was successful.
Additional treatment outcomes
All procedures were technically successful. Two patients developed pneumoperitoneum during the procedure, but remained hemodynamically stable. One was treated by placing a large-bore lumbar puncture needle into the peritoneal cavity and aspirating the air. The other patient was managed conservatively. None of the patients developed significant bleeding or required blood transfusion between or after sessions. There was no worsening of failure or development of new organ failure during the STE sessions.
Surgical pancreatic necrosectomy, which is traditionally used to treat pancreatic necrosis, is associated with significant morbidity and mortality [3,4]. In contrast, many studies have shown that a minimally invasive approach in acute necrotizing pancreatitis improves patient outcome and reduces hospital stay [15-21].
Over the past several decades, the endoscopic method of pancreatic necrosectomy has evolved tremendously. In addition, with a better understanding of the pathophysiology of acute pancreatic fluid collections and studies favoring a conservative approach in pancreatitis, a step-up approach is advocated in managing patients with acute necrotizing pancreatitis [13]. DEN after the placement of trans-mural stents is now a popular and effective method to treat WON that is close to the stomach or duodenum [22-26]. However, the endoscopic method of necrosectomy is appropriate for necrotic collections in and around the pancreatic head. Laterally placed WON, i.e., more than 1–2 cm from the stomach or duodenal wall, is not suitable for transmural drainage [27]. These laterally placed necrotic collections have been treated traditionally with a surgical approach.
The present case series of laterally placed WON has shown that conservative treatment combined with STE was effective. We had success in 90% of our patients with no significant morbidity and mortality. While many studies have reported DEN for centrally placed WON, studies using STE are sparse and limited. Table 2 shows the data from the reported studies on STE [28-30].
Carter et al. [29] as well as Mui et al. [30] have used STE as the primary modality as well as for residual collection after open necrosectomy. The present study is in agreement with the study by Dhingra et al. [31], who used STE as an alternative to open necrosectomy. Our results for STE, with 90% success, no mortality, fewer (mean 2.3) sessions, and relatively shorter hospital stay appear to be better than those in earlier series. This could be due to the use of a different technique than previously reported. Dhingra et al. [31] and Carter et al. [29] initially placed an 8–12-Fr catheter and gradually upsized the catheter or dilated the tract to 10–15 mm using a balloon. This obviously required multiple sessions. In contrast, we performed initial drainage with a 32-Fr drainage tube in 8 of 10 patients. This facilitated endoscopic necrosectomy earlier in the course of illness. We used diluted H2O2 to facilitate subsequent sessions. The efficacy of H2O2 during DEN has been documented [31]. In contrast to the study by Carter et al. [29] in which general anesthesia was used, we used propofol sedation in all our patients. Our high success and low complication rates could also be due to our decision to stop the procedure at the first sign of mild ooze and our use of fluoroscopic control to identify any pneumoperitoneum. Moreover, we have not combined ERCP with STE. Mui et al. [30] used ERCP in 9 of 13 cases. They used a pancreatic stent in 8 patients and performed stone extraction in 4. Carter et al. [29] also performed ERCP with sphincterotomy in 5 of 14 patients. STE has been used to treat postoperative fistula and is often referred to as fistuloscopy in this situation.
The technique of STE needs to be refined further, with determination of the optimum interval between sessions, endpoint during each session, and the final end-point. Moreover, the procedure we used required fluoroscopy, with its risk of radiation, was time consuming, and had a risk of hemorrhage. While we did not encounter any significant bleeding, control of bleeding would be difficult in a cavity with limited endoscopic maneuverability. Repeated introduction of an endoscope through the sinus tract may be facilitated by the development of a properly designed covered metal stent. Accessories for removal of necrotic tissue at present are not ideal and need to be optimized.
A limited number of studies have examined modalities other than open surgery or STE to treat laterally placed WON. These modalities include percutaneous radiological drainage, laparoscopic necrosectomy, and retroperitoneal endoscopic necrosectomy [32-37]. In a series of 8 patients, Bucher et al. [33] reported that laparoscopic necrosectomy was successful in all cases, and 7 of the 8 patients were cured in a single session. Others have also reported isolated cases of laparoscopic necrosectomy either directly into the retroperitoneum or through the transgastric route [33-35]. However, greater experience and comparative studies with STE are required for better understanding of laparoscopic necrosectomy in the treatment of WON.
Percutaneous radiological drainage and lavage without active necrosectomy, either alone or in combination with endoscopic drainage, have also been used for WON [36]. However, the results are variable and there is a need to lavage several times daily for a prolonged period. Moreover, there is a potential risk of development of a pancreaticocutaneous fistula. Further studies are required to clarify whether simple percutaneous drainage can be considered as first-line treatment for laterally placed WON and whether it can be followed by STE as a step-up technique.
Minimally invasive retroperitoneal endoscopic necrosectomy is another alternative to treat laterally placed WON [38]. However, the procedure appears to be more invasive than STE, with a potential risk of visceral injury and hemorrhage, and also requires greater operator skills.
This study has clearly demonstrated that STE is an alternative treatment method for laterally placed WON that is not amenable to endoscopic necrosectomy. However, as this was an observational study, we cannot draw any conclusion regarding its superiority to open surgery, retroperitoneal necrosectomy, or radiological drainage.
In conclusion, STE is an important and minimally invasive endoscopic technique for the management of acute necrotizing pancreatitis complicated by laterally placed WON. In properly selected patients with infected pancreatic necrosis, STE can prevent or delay surgery with minimal complications. Sinus tract endoscopic necrosectomy can be used in step-up management of acute infected pancreatic necrosis.
Fig. 1.
Outcome of patients admitted with acute pancreatitis. WON, walled-off necrosis.
ce-2017-066f1.gif
Fig. 2.
Sinus track endoscopy (STE). (A) Computed tomography (CT) scan showing a walled-off necrosis (WON) with a 32 Fr percutaneous catheter (arrows) placed in it. (B) Percutaneous catheter being removed to perform STE. (C) Necrotic material inside the WON. (D) Necroscectomy being performed. (E) End point of necrosectomy showing healthy granulation tissue. (F) Necrotic tissue after removal. (G) CT scan showing near resolution of WON. Also note a self-expanding stent (arrows) placed through the stomach to drain peri-gastric WON.
ce-2017-066f2.gif
Table 1.
Patient Demography as well as Details of Sinus Track Endoscopy and Its Outcome
No Age Sex Etiology CTSI Hospital stay (days) No. of sessions Drain size Success Complications
1 55 Male Gall stone 8 18 2 32 F Yes Nil
2 38 Male Alcohol 10 44 3 32 F Yes Nil
3 50 Male Nil 7 20 1 32 F Yes Peumo
4 55 Male Gall stone 8 35 4 32 F Yes Peumo
5 29 Male Traumatic 10 21 3 32 F Yes Nil
6 37 Male Alcohol 6 30 2 32 F Partlya) Nil
7 36 Female Gall stone 7 22 1 32 F Yes Nil
8 45 Female Gall stone 8 18 2 32 F Yes Nil
9 38 Female Nil 8 18 2 32 F Yes Nil
10 52 Male Alcohol 8 19 3 32 F Yes Nil

CTSI, computed tomography severity index.

a)Patient underwent surgical necrosectomy.

Table 2.
Summary of Reported Series of Sinus Track Endoscopy for Pancreatic Necrosis
Study No. of patients Initial intervention No. of STE sessions Adjunct procedures & No. of patients Hospital stay (days) Success rate (%) Mortality (%)
Carter et al. (2000) [29] 14 ON: 4 Mean: 3.1 ERCP: 6 Mean: 59.9 78.6 14.3
PD: 10 Range: 2–5 Range: 23–213
Mui et al. (2005) [30] 13 ON: 4 Mean: 5.1 ERCP: 9 Mean: 95.5 76.9 7.7
PD: 9 Range: 1–18 Range: 29–194
Dhingra et al. (2015) [31] 15 PD: 15 Mean: 4.9 - Mean: 56 93.3 6.7
Range: 2–13 Range: 21–84
Present study (2016) 10 PD: 10 Mean: 2.3 Endoscopic necrosectomy: 2 Mean: 24.7 90 -
Range: 1–4 Range: 18–44

STE, sinus track endoscopy; ON, open necrosectomy; PD, percutaneous drainage; ERCP, endoscopic retrograde cholangiopancreatography.

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      Pancreatic Necrosectomy through Sinus Tract Endoscopy
      Clin Endosc. 2018;51(3):279-284.   Published online January 4, 2018
      DOI: https://doi.org/10.5946/ce.2017.066
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    Pancreatic Necrosectomy through Sinus Tract Endoscopy
    Image Image
    Fig. 1. Outcome of patients admitted with acute pancreatitis. WON, walled-off necrosis.
    Fig. 2. Sinus track endoscopy (STE). (A) Computed tomography (CT) scan showing a walled-off necrosis (WON) with a 32 Fr percutaneous catheter (arrows) placed in it. (B) Percutaneous catheter being removed to perform STE. (C) Necrotic material inside the WON. (D) Necroscectomy being performed. (E) End point of necrosectomy showing healthy granulation tissue. (F) Necrotic tissue after removal. (G) CT scan showing near resolution of WON. Also note a self-expanding stent (arrows) placed through the stomach to drain peri-gastric WON.

    Fig. 1.

    Fig. 2.

    Pancreatic Necrosectomy through Sinus Tract Endoscopy
    No Age Sex Etiology CTSI Hospital stay (days) No. of sessions Drain size Success Complications
    1 55 Male Gall stone 8 18 2 32 F Yes Nil
    2 38 Male Alcohol 10 44 3 32 F Yes Nil
    3 50 Male Nil 7 20 1 32 F Yes Peumo
    4 55 Male Gall stone 8 35 4 32 F Yes Peumo
    5 29 Male Traumatic 10 21 3 32 F Yes Nil
    6 37 Male Alcohol 6 30 2 32 F Partlya) Nil
    7 36 Female Gall stone 7 22 1 32 F Yes Nil
    8 45 Female Gall stone 8 18 2 32 F Yes Nil
    9 38 Female Nil 8 18 2 32 F Yes Nil
    10 52 Male Alcohol 8 19 3 32 F Yes Nil
    Study No. of patients Initial intervention No. of STE sessions Adjunct procedures & No. of patients Hospital stay (days) Success rate (%) Mortality (%)
    Carter et al. (2000) [29] 14 ON: 4 Mean: 3.1 ERCP: 6 Mean: 59.9 78.6 14.3
    PD: 10 Range: 2–5 Range: 23–213
    Mui et al. (2005) [30] 13 ON: 4 Mean: 5.1 ERCP: 9 Mean: 95.5 76.9 7.7
    PD: 9 Range: 1–18 Range: 29–194
    Dhingra et al. (2015) [31] 15 PD: 15 Mean: 4.9 - Mean: 56 93.3 6.7
    Range: 2–13 Range: 21–84
    Present study (2016) 10 PD: 10 Mean: 2.3 Endoscopic necrosectomy: 2 Mean: 24.7 90 -
    Range: 1–4 Range: 18–44
    Table 1. Patient Demography as well as Details of Sinus Track Endoscopy and Its Outcome

    CTSI, computed tomography severity index.

    Patient underwent surgical necrosectomy.

    Table 2. Summary of Reported Series of Sinus Track Endoscopy for Pancreatic Necrosis

    STE, sinus track endoscopy; ON, open necrosectomy; PD, percutaneous drainage; ERCP, endoscopic retrograde cholangiopancreatography.

    Table 1.

    Table 2.

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