Robot-assisted trans-gastric drainage and debridement of walled-off pancreatic necrosis using the EndoWrist stapler for the da Vinci Xi:A case report

Luca Morelli,Niccolò Furbetta,Desirée Gianardi,Matteo Palmeri,Gregorio Di Franco,Matteo Bianchini,Gianni Stefanini,Simone Guadagni,Giulio Di Candio

Abstract

Key words: Case report; da Vinci Xi; EndoWrist stapler; Walled-off pancreatic necrosis;TilePro; Minimally-invasive surgery

INTRODUCTION

Walled-off pancreatic necrosis (WOPN),first described by Connoret al[1],is a late complication of acute pancreatitis that generally needs some interventions[2].WOPN represents a challenging critical problem and it is still burdened by a high rate of mortality and morbidity[3].The management of a WOPN depends on its location and on patient's symptoms.Trans-gastric drainage and debridement of WOPN represents an important surgical treatment option for selected patients[4].

While laparoscopic trans-gastric drainage of WOPN is well-described in the literature,only few cases of robotic approach have been published[5-7].Furthermore,these described cases were all performed with the da Vinci Si platform and without the use of the TilePro™ function and the robotic EndoWrist staplers.Herein we report the case of a WOPN treated with a trans-gastric drainage and debridement using the da Vinci Xi surgical system with its tools such as the EndoWrist stapler and the TilePro™ function.

CASE PRESENTATION

Chief complaints

A 63-year-old man presented an acute episode of postprandial epigastric pain and vomiting.

History of present illness

An acute necrotizing pancreatitis was found at computed tomography (CT) scan at the time of admission.The patient was subsequently admitted to the Intensive Care Unit and underwent medical conservative treatment (nihilper osand total parenteral nutrition),with progressive normalization of pancreatic enzymes.After 6 wk the patient developed a walled massive fluid collection,with an extensive pancreatic necrosis,causing obstruction of the gastrointestinal tract.

History of past illness

Hypertension,dyslipidemia,chronic alcohol consumption and smoking.

Physical examination upon admission

During the physical examination the patient presented diffusive abdominal pain.Vital signs on admission were as follows:temperature was 37.2 °C,heart rate was 94 beats per minute (bpm),initial blood pressure was 115/70 mmHg.In addition,his lungs and heart were found to be normal by auscultation.He always remained cardiovascularly stable.

Laboratory examinations

Abnormal laboratory data at time of admission of complete blood count were as follows:RBC 3.76 × 106/µL,Hb 11.7 g/dL,HCT 34.7%,MCHC 256 g/L,WBC 18.15 ×103/µL,PLT 580 × 103/µL,lipase 3165 U/L,amylase 2765 U/L and the latter progressively decreased in the days after admission.

Imaging examinations

The CT-scan performed at the time of admission showed an extensive pancreatic necrosis with multiple perivisceral fluid collections.CT-scans performed 1 and 3 wk after the admission revealed the development of a walled massive fluid collection (7 cm × 20 cm × 18 cm).The CT-scan performed 6 wk after the acute episode confirmed the presence of a WOPN with increased dimensions that compressed the stomach and the first duodenal portion.

FINAL DIAGNOSIS

WOPN.

TREATMENT

A trans-gastric drainage and debridement was successfully performed using the da Vinci Xi robotic platform.The procedure was completed in 130 min.Firstly,guided by intraoperative ultrasound (US)-scan,an anterior ideal gastrotomy was carried out(Figure 1).The intra-operative US scan was performed with a dedicated robotic probe using the TilePro™ function.This technology consents the surgeon to view 3D video of the operative field along with ultrasound exam.Then,through the gastrotomy,the best location for drainage on the posterior gastric wall was again US-guided identified.The anastomosis between the posterior gastric wall and the walled-off necrosis wall was carried out with the new EndoWrist stapler with vascular cartridge(Figure 2).Debridement and washing of the cavity through the anastomosis were performed (Figure 3).Finally,the anterior gastrotomy was closed with three layers of 3-0 V-Lock running sutures and the cholecystectomy was performed.

OUTCOME AND FOLLOW-UP

No intra-operative complications were recorded.The postoperative course was uneventful and a post-operative CT-scan showed the collapse of the fluid collection.Six months after discharge,the patient underwent abdominal ultrasound that confirmed the complete collapse of the abdominal fluid collections and the good midterm result of the operation.The scheduled follow-up consists in blood tests and ultrasound examination every 6 months.CT-scan or MRI will be reserved for any variations in clinical evaluation.

DISCUSSION

Figure1 TilePro™ function,used to identify the best location for anterior gastrotomy,consenting the surgeon to view 3D video of the operative field along with ultrasound exam.

The advantages of a minimally-invasive approach for the treatment of pancreatic pseudocysts and WOPN are well known[8,9].In the last decades different minimally invasive approaches have been described in literature,including endoscopic[10],laparoscopic[11,12],SILS[13]and robotic approach[5-7].Several cases of laparoscopic drainage of pancreatic pseudocysts by cystogastrostomy have been described since the late 90s by Smadjaet al[14].Recently,Duaet al[12]analyzed the outcomes of 46 patients underwent open and laparoscopic trans-gastric pancreatic necrosectomy,in terms of postoperative complications and mortality.Thirty-seven of these patients were treated with a laparoscopic approach and 9 with an open one.In this case series,with a median post-operative hospital stay of 6 d,4 patients have required a percutaneous drainage for residual fluid collection and only 6 patients (13%) had postoperative bleeding.Series of robotic approaches are lacking in literature,only some isolated case reports are present[5-7],demonstrating all the feasibility of robotic cystogastrostomy and the possibility to easier perform the debridement of the cavity.

The endoscopic approach remains a valid option for WOPN,as reported in several papers,but,in our experience,it results more indicated for the treatment of pancreatic pseudocysts,where there is not a solid component.Indeed,in the WOPN which requires extended debridement,the endoscopic approach can be very laborious and often it does not lead to the desired result.In fact,it allows to perform a small communication between the stomach and the cavity,draining predominantly the fluid component.On the other hand,in case of WOPN with significant solid component and characterized by irregular shape,the endoscopic instruments may not allow the extensive debridement that we have obtained with the described technique.

Thus,we proposed a robotic technique that presents three main key points:(1)The increased dexterity guaranteed by the robotic technology which allows to perform a safer and more radical debridement of the WOPN cavity; (2) The use of the new EndoWrist robotic stapler with the smart clamp technology,which could reduce the risk of bleeding related to the cystogastrostomy; (3) The Tile-pro™ function which gives high degree of precision in defining the best location for the gastrostomy and in detecting the presence of blood vessels.

As described in the “2012 revision of the Atlanta Classification of acute pancreatitis”[2]the WOPN (“a mature,encapsulated acute necrotic collection with a well defined inflammatory wall”) differs from the pancreatic pseudocyst (“an encapsulated,well defined collection of fluid but no or minimal solid component”)based on the presence of a solid component and the onset timing,with a direct implication on the necessity and on the difficulty in the performing the debridement.Indeed,usually in the treatment of a pancreatic pseudocyst the only need is to let the cyst communicate with the stomach or the bowel in order to drain the liquid,thus reducing the pressure inside the pseudocyst.Instead,the necrotic material contained within the WOPN is usually denser and requires a substantial debridement.In this context,in dealing with the WOPN,the dexterity of the robotic platform can give advantages compared to laparoscopy in the execution of a more extensive and safer debridement.Indeed,the debridement of the large,irregular cavity could be compromised because of the kinematics limitations of laparoscopy,mainly due to the less degrees of freedom which limit the accessibility to the cavity in all directions and angles.The only limitation of this robotic procedure can be the lack of tactile feedback,but it could be overcome with the surgeon’s experience.

The issue of bleeding after the pseudocystogastrostomy is well known and described in literature[15-17]and it is due to the state of inflammation resulting from the pancreatitis and to the exposure of the suture to gastric acidity.Furthermore,the gastric wall is highly vascularized and the suture performed is not always completely hemostatic.The robotic stapler used in this case report thanks to the smart clamp technology,is able to note the suitable thickness of the tissues between the branches,guaranteeing to perform the suture only if the chosen charge is compatible.In this way,the controlled use of the stapler with a vascular charge,when allowed by the system,reduces the risk of post-operative bleeding,the main feared problem of this procedure.Moreover,the robotic stapler with its new EndoWrist technology can be articulated with a range of 108° and allows the operator to directly control all the steps of the suture ("positioning,grip,clamp and fire").Finally,the new Tilepro™function and the Xi platform,used in this case report,brought further benefits in the execution of the surgical procedure.

Figure2 Anastomosis between the posterior gastric wall and the walled-off necrosis wall carried out with the new EndoWrist stapler with vascular cartridge.

We used a dedicated intraoperative US probe (12-5 MHz,linear curved array,BK Medical APS,Peabody MA,United States) to identify the best location for the gastrostomy.This probe can be introduced through the assistant port and it is designed to perfectly fit the robotic instruments in order to join the maximum direct control.The TilePro™ function can superimpose ultrasound imaging on the console screen,alongside the 3D vision of the operatory field,eliminating several problems related to hand-eye coordination[18].This specific robotic ultrasound probe,thanks to the flexible cable and the small surface,can give more flexibility than those used in pure laparoscopy,because the surgeon sitting at the console is able to manipulate the probe tip directly with the dominant hand,maintaining the perpendicular contact to the target with a high degree of precision in defining the best location for the gastrostomy and in detecting the presence of blood vessels.

The use of the Xi robotic platform is the latest addition to this clinical case.Indeed,the few previously described cases had all been performed with the Si platform[5-7].The WOPN cavity can be anfractuous,irregular and long,increasing the risk of conflicts between the instruments.Therefore,the new da Vinci Xi,having more flexibility and reducing the risk of collision between the arms,could allow a better accessibility in the cavity during the debridement.

CONCLUSION

In selected cases of WOPN the da Vinci Surgical System can be safely used as a valid surgical treatment option in alternative to the endoscopic and to the laparoscopic approach.The enhanced surgical dexterity and the EndoWrist stapler together with the Tile-Pro multi-input display and the new Xi platform,could give some advantages in the treatment of this challenging disease.

Figure3 Debridement and washing of the cavity performed through the anastomosis.