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Videosurgery and Other Miniinvasive Techniques
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Original paper

Indications and benefits of intraoperative esophagogastroduodenoscopy

Martin Stašek
,
René Aujeský
,
Radek Vrba
,
Martin Loveček
,
Josef Chudáček
,
Petr Janda
,
Michal Gregořík
,
Katherine Vomáčková
,
Čestmír Neoral
,
Dušan Klos

Videosurgery Miniinv 2018; 13 (2): 164–175
Online publish date: 2018/01/22
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Introduction

Intraoperative esophagogastroduodenoscopy (IOG) is a diagnostic and therapeutic modality with multiple purposes. There are significant differences between surgical departments and individual surgeons regarding the indications for IOG, with questionable possibility to evaluate the benefit.

Aim

The aim of our work is to evaluate the indications for IOG, to compare our experience with information in the literature and establish options for current clinical use.

Material and methods

The authors present a retrospective study of 110 IOGs in 104 patients indicated for gastroscopy in the operating room under general anesthesia. The data were collected from the documentation and patient information and preoperative and intraoperative findings including preoperative plan, timing of IOG, preoperative evaluation of the specific pathology, intraoperative finding and localization of the pathology, type of endoscopic procedure and surgical procedure, change of the preoperatively expected procedure and approach. Postoperatively, complication and pitfalls of the endoscopy and 30-day survival were assessed. In individual indications, the number of intraoperative endoscopies was correlated with the total number of related procedures to highlight the specific indication for the intraoperative approach.

Results

The indications for IOG according to the preoperative documentation are listed in Figure 1.

Benign esophageal conditions

Indications in gastroesophageal reflux disease (GERD) comprised evaluation of re-do operations in 2 patients and other pathologies (intramural processes, diverticula) in 3 patients. In this period, we performed 502 procedures for GERD.
The IOG was indicated to identify the level of the caustic esophageal stenosis and healthy mucosa with subsequent colonic conduit replacement. The fistula management included exact localization and navigation of surgery in a patient after sleeve gastrectomy with gastropleurobronchial fistula and evaluation of the fistula tract following resection of esophageal diverticula during thoracostomy using vacuum therapy.
Suspected perforation included one case of pneumomediastinum, one case of iatrogenic perforation in suspected Zenker’s diverticulum (from another facility) and perforation of the stomach following laparoscopic fundoplication.

Esophageal tumors

The indication of IOG in esophageal tumors (Figure 2) followed the idea of localization of the process and navigation of the surgery in the majority of cases, especially in mesenchymal intramural tumors and early, non-palpable tumors. In early tumors the definitive decision between endoscopic and surgical treatment can be managed. The further indication was dysphagia with previously missed tumor of cervical esophagus and advanced cancer in order obtain the pathology specimen to decide about the further strategy to obtain nutrition and to determine the oral border of the tumor. Two hundred and thirty esophagectomies were completed during the period.

Upper gastrointestinal bleeding

Upper gastrointestinal bleeding included 8 cases, 5 cases of spontaneous bleeding (3 duodenal ulcer bleedings, 1 small bowel and 1 colonic bleeding) and 3 postoperative cases (bleeding following fundoplication, pancreatogastric anastomosis and bleeding from the esophageal conduit after esophagectomy).

Nutritional support

Nutritional support was indicated in 10 patients. It comprised high-risk indications for percutaneous endoscopic gastrostomy (PEG) (3 cases – postoperative states, high-risk patient, a combination with other operation) and uncertain possibility to provide PEG (finalized by open gastrostomy – 3 cases) and extraction of migrated stents (3 cases). In 1 case, impaired gastric emptying with stenosis of palliative gastroenteroanastomosis was evaluated. During the study period, we performed 110 gastrostomies and 272 PEGs.

Gastric and duodenal tumors

The spectrum of gastric tumors is presented in Figure 3. In this period, we performed gastric resection for cancer in 284 cases. Operated intramural tumors comprised 28 cases, requiring 14 open and 14 laparoscopic procedures. Carcinoids were treated using the technique of endoscopic mucosal resection, in the first case as a sole endoscopy, in the second case during distal pancreatectomy due to pancreatic mass.
Duodenal tumors included 1 case of adenoma with high-grade dysplasia and 1 case of typical carcinoid.

Mediastinal pathologies

Mediastinal pathologies included 1 cystic formation and 2 mediastinal abscesses.

Strategy and purposes of IOG

The indication for IOG was established preoperatively in 87/110 cases, and peroperatively in 23 cases. The peroperative indications comprised localization of a non-palpable tumor (15), bleeding with failed localization (2), localization of the perforation (3) and individual indication (nasojejunal tube placement, stent indication, evaluation of the gastric morphology).
Successful localization of the lesion was achieved in 98% (108 patients). The localization failed in 2 cases – perforation after laparoscopic fundoplication and metastasis in the small bowel in gastric carcinoma (intraoperatively confirmed systemic disease).
Significant new or changed findings were present in 26 endoscopies (Table I).

Endoscopic termination of the procedure

The endoscopic procedures included 79 diagnostic endoscopies with possible biopsy, which included verification of mucosal trauma (13) and suture leak (12). The polyp was removed in 22 cases, using various technical methods (polypectomy/endoscopic mucosal resection/endoscopic submucosal dissection in 6/7/9 cases respectively). Further endoscopies included hemostasis (argon-plasma coagulation, injection hemostasis – 2 patients), foreign body extraction (stent), esophageal abscess incision, enteral tube placement and percutaneous endoscopic gastrostomy (4 cases).
Sole endoscopy was performed in 20 (18%) cases, finalized with the endoscopic alternative of therapeutic possibilities, as listed in Table II.

Results of endoscopy-assisted surgery

The list of final surgical procedures is presented in Table III, dividing the indications following the localization and general indication for therapy.
Comparing the preoperative plans from the documentation and final technique and results of the surgical therapy, we gained information about the change in surgical approach (Figure 4). Despite the support of minimally invasive treatment, the IOG necessitated conversion to open surgery in 5 cases. Increase and gross change of the resection extent resulted in the decision for enucleation to esophagectomy, total gastrectomy (TGE) to esophagectomy, esophagectomy to TGE (2 cases), extension of the esophageal resection to the stomach, TGE in non-palpable tumor (3 cases), wedge resection to Billroth I, diverticulectomy and wedge resection enlargement (2 cases). Decreased resection included proximal gastrectomy to wedge resection and targeted and decreased wedge resections of the stomach and duodenum. The operation was cancelled in 1 case and preoperatively planned esophageal or gastric resection was omitted in 4 cases (followed by other planned surgery).
The IOG-related morbidity was identified in 3 cases – positivity of the resection line following endoscopic mucosal resection, recurrent bleeding and perforation following endoscopic submucosal dissection requiring surgical revision.
General 30-day mortality of the group undergoing IOG was 3.6% (4 patients). Causes included pulmonary embolism, heart failure with pulmonary edema, respiratory failure and multiple organ failure following gastric conduit necrosis after esophagectomy. No causal connection to the IOG was proven.

Discussion

The history of intraoperative use of various endoscopic methods comprises a wide spectrum of possibilities including gastroscopy, colonoscopy, cholangioscopy, enteroscopy, endoscopic ultrasound (EUS) and endoscopic retrograde cholangiopancreatography (ERCP).
General indications for IOG include planned endoscopic procedures with high risk of surgical complications, pathology with the alternative of both endoscopic and surgical therapy, failure to localize the pathological process, new intraoperative finding, evaluation of the anastomosis and management of anastomotic insufficiency, intraoperative navigation of the surgery and decreased patient’s compliance (including pediatric indication) [1] and patient’s wishes. The IOG should not replace inadequate preoperative evaluation.

General strategy of IOG

The approach to the indication of IOG can be absolute or selective. The absolute approach means endoscopic performance in all specific pathologies (e.g. GIST) or all specific procedures (e.g. gastric sleeve, total gastrectomy, re-do fundoplications). Our preferred approach is selective use in preoperatively discussed patients with uncertainties in the preoperative workup and intraoperative decision-making. We are more likely to perform non-selective IOG in esophageal or gastric intramural tumors, esophageal diverticula (middle and lower esophagus), re-do fundoplications and early-stage gastric and esophageal tumors. Bariatric procedures and endoscopic procedures on the biliary tree were excluded from the observed group.
Preoperative indications are more frequent. The intraoperative decision for IOG means a certain delay due to organization and personnel requirements. This is the place for a strong recommendation of training of upper GI surgeons in digestive endoscopy [2–4] comprising both diagnostic and therapeutic modalities (percutaneous endoscopic gastrostomy, polypectomy, endoscopic mucosal resection and endoscopic submucosal dissection, endoscopic hemostasis, foreign body extraction, tube placement, etc.). The endoscopist should obtain sufficient knowledge of the surgical approach and assessment of the surgical complications and postoperative situations.
The IOG localizes the pathology in the vast majority of cases. The main advantage of IOG can be appreciated in non-palpable lesions, pathology in a problematic localization (cardio-esophageal junction, posterior gastric wall, esophagus and mediastinum) and in the absence of tactile verification. Main reasons for failed localization in sole endoscopy are perforation and changed situation due to the healing process (ulcer, early cancer, incomplete endoscopic removal of early tumors indicated for limited resection). In the case of bleeding it can be a different location of the bleeding process, massive bleeding and small lesions (e.g. Dieulafoy ulcer). Preoperative endoscopy offers various possibilities of marking of the lesions including dye spot marking [5], autologous blood marking [6], clip placement [7–9], computed methods [10] or acceptance of preoperative endoscopic evaluation by the endoscopist [11].

New findings during IOG

New findings during endoscopy may be of various importance. Highly important are findings of changed localization of the pathology leading to a different surgery; different findings recognized during cooperation of the surgeon and endoscopist could lead to the definitive decision about treatment modality (additive surgery, endoscopic versus surgical therapy). The majority of intraoperative decision-making strategies could be prevented with preoperative EUS (evaluation of the depth of invasion in early cancer, intramural abscesses and tumors) or preoperative endoscopy. The necessity of weighting further diagnostic methods and cooperative decision making is obvious.

Endoscopic termination of the procedure

The endoscopic finalization of the procedure varies from diagnostic gastroscopy and standard procedures for nutritive support (peroral endoscopic gastrostomy, jejunal tube placement) to endoscopic tumor removal using the technique of endoscopic mucosal resection (EMR) or endoscopic submucosal dissection (ESD). Especially in the esophagus and cardia, even complete evaluation by EUS [12] may not reliably confirm the depth of invasion of early cancer. In the case of the non-lifting phenomenon, immediate continuation with the surgical procedure is possible. Further evidence should be gained in sentinel lymph node retrieval after endoscopic tumor resections.
The number of endoscopically finalized procedures varies greatly according to the type of facility with a strongly decreased number in surgical departments without skilled endoscopists. A stronger tendency to indicate IOG in early tumors is observed in early esophageal and cardia tumors and gastric tumors in demanding locations (subcardial, fundal, lesser curvature); incomplete removal can be radicalized by surgery without significant risk increase. The exact identification of the overgrowth of cardia tumors into the esophagus remains an important issue, along with a potential to change the resection extent substantially.
The patient undergoing planned IOG and surgery should be preoperatively informed about both therapeutic possibilities. In the case of an intraoperative decision, it is with the objective to achieve the least invasiveness. In the majority of doubtful cases, we provide preoperative endoscopic evaluation, which decreases the necessity of IOG for non-selective use in specific pathologies.

Benign esophageal conditions

In GERD the main indications include suspected or proven local comorbidities (short esophagus [13–15], intramural tumors, diverticula [16]) with possible use of intraoperative manometry [17] and a special indication of re-do fundoplications for postoperative complications (suspected perforation, slipped Nissen, intrahiatal compression). The IOG technique requires securing of the esophagocardial junction, diaphragmatic impression, and translumination in adhesions after previous surgery. In some upper GI surgery centers, IOG is required in revisional procedures.
The IOG in esophageal diverticula [18–20] offers help in the preparation phase, as leading for stapler placement and detection of insufficiency in the stapler line. Furthermore, the safety of the myotomy can be verified. In the case of stenosis, especially of caustic origin, endoscopy enables identification of the level of healthy mucosa and pertubability of the lumen of the oral part of the esophagus.
Fistula cases represent mostly postoperative fistulas. For diagnostic purposes, we expect localization of the fistula, measuring of the accessible part of the fistula, evaluation of the outlet part of the esophagus and stomach, quality of adjacent mucosa, and fistulography. For therapeutic purposes, we can provide debridement and lavage, drainage, endoscopic vacuum assisted closure [21], clipping (using over the scope clips or hemoclips) [22], stent introduction [23] and local use of fibrin tissue glues [24], sometimes in combination or consecutively [25]. The endoscopic therapy requires repeated applications and endoscopic revisions. The potential surgical part contains suture with omental flap reinforcement, vacuum-assisted closure placement, surgical drainage or even resection, usually multiple staged. The combination of surgical and endoscopic interventions may increase the possibilities of minimally invasive therapy. Repeated endoscopies usually do not require endoscopy in the OR and a meaningful approach to the necessity of the combined approach has to be chosen.

Esophageal tumors

Esophageal tumors represent an important field for IOG. In epithelial tumors, endoscopy can offer additional diagnostic information in the unsatisfactory preoperative evaluation and in nonpalpable tumors, including the evaluation of completion of the removal and the resection line [26], and endoscopic removal in early tumors if the positive lifting phenomenon is observed [27, 28]. The sentinel lymph node can be localized after intra- or peritumoral injection of the tracer as a promising tool for targeted treatment of early tumors [29]. In advanced tumors especially of the upper esophagus, we can decide on stent placement (in our facility provided under X-ray guidance) or nutritive jejunostomy/gastrostomy. Endoscopic navigation offers perfect localization of intramural tumors with possible translumination and evaluation of the mucosa during surgical removal, mostly enabling a minimally invasive approach [30]. In tumors of the cardia, the possibility of endoscopic mucosal resection may greatly decrease the burden of surgical exposure (even a combined abdominal and thoracic approach).

Gastric ulcer, perforation of the upper gastrointestinal tract

Non-complicated gastric ulcer is a rare indication for IOG, usually only in terms of elective operation and intraoperative verification of the healing process. Perforation is a doubtful indication for IOG. The diagnosis of spontaneous perforation (Boerhaave syndrome [31], gastric ulcer perforation, fissuration of the tumor) is usually established without the necessity of endoscopic assistance, and despite endoscopic treatment possibilities (endoscopic omentoplasty [32], clipping, stenting) we still find surgery the gold standard of therapy in gastric ulcer and early Boerhaave syndrome. In the case of iatrogenic perforation, the recognition of perforation differs according to the localization and procedure [33–35]. Problematic diagnostic situations include perforation in Zenker’s diverticulum, fundoplication and endoscopic submucosal dissection [36].

Upper gastrointestinal bleeding

Failed endoscopic therapy of upper gastrointestinal bleeding requires a cooperative approach of the surgeon, interventional radiologist and endoscopist [37]. The place for IOG is in massive bleeding disabling the localization of the bleeding (fundal varices, Dieulafoy ulcer [38], angiodysplasia [39], esophagocardial junction bleeding, bleeding from post-duodenal location) or in postoperative bleeding (post-pancreatectomy bleeding [40, 41], esophageal conduit bleeding, bleeding after fundoplication, sleeve gastrectomy [42] etc.). Gastroscopy without identification of the specific bleeding lesion may continue with intraoperative enteroscopy [43–45]. In the minority of surgical therapies, endoscopic therapy can be used (clipping of small ulcers, ligation of the esophageal component of gastroesophageal varices type GOV 1 and 2) usually as an adjunct to surgical therapy. In general, failed endoscopic hemostasis requires an appropriate surgical haemostatic technique as definitive treatment – ligation, resection, completion of the pancreatectomy, etc.

Nutritional support

The means for nutritional support (gastrostomy, stenting) are conventionally performed in local anesthesia following common indications [46, 47]. The cases indicated for performance in the OR include uncertain diagnosis (upper esophageal/hypopharyngeal tumors preoperatively misdiagnosed), general indisposition for sufficient compliance (mental retardation, panic disorder), complicated postoperative states with real risk of colonic/small bowel interposition, failed or complicated percutaneous endoscopic gastrostomy in the patient’s history, states after gastric resection, and indications for other surgical procedures (tracheostomy etc.).

Gastric and duodenal tumors

In gastric tumors, the main advantage of IOG is in localization of the pathology (together with further advanced preoperative imaging and evaluation) [48], especially in small and non-palpable tumors, navigation of surgery, favorably in less synoptic locations (esophagocardial junction, lesser curvature, posterior gastric wall) [49]. In these locations of mesenchymal or early epithelial tumors (following EUS examination [50]) EMR/ESD or even the submucosal tunnelization technique could be indicated [51] with possible laparoscopic assistance. In the case of failed endoscopic treatment, immediate IOG-navigated limited resection [30, 49, 52, 53] with even increased safety may follow [54]. Proper navigation increases the probability of appropriate minimally invasive treatment; the specific technique varies from conventional laparoscopic and endoscopic cooperative surgery (LECS), inverted LECS, non-exposure techniques (CLEAN-NET) and even non-exposed endoscopic wall-inversion surgery (NEWS) [55]. Staple line or mucosal damage control is recommendable (air leak test, direct control, translumination) [56]; in our case series it was fully reliable as a predictor of suture leak. Contrarily, missed perforation in ESD procedures can appear postoperatively in up to 14% of cases [57].
In duodenal tumors, a meaningful indication of IOG remains in D1-D4 early tumors and polyps feasible for endoscopic [58] or partial surgical resection [59–62] in order to navigate surgery. In tumors within the papilla, the EUS should exclude patients suitable for surgical resection and identify neoplasms suitable for endoscopic resection of the papilla and double-duct drainage [63, 64]. Further localization techniques include intraoperative ultrasound and EUS [65], especially in neuroendocrine tumors. The indication in duodenal tumors remains rare.

Mediastinal pathology

Most mediastinal pathologies require CT or PET CT scans and EUS (endobronchial and esophageal). The reliability of cytologic examination in these pathologies is questionable, despite promising, but limited, evidence in the literature [66, 67]. Most of the indications for IOG include tumorous processes adjacent to the esophageal wall with a higher risk of esophageal damage (cystic lesions, neurogenic and mesenchymal tumors) [68], suspected abscesses of the esophageal wall and mediastinum with possible intraluminal drainage.

Suture/anastomosis and mucosa control

The importance of the evaluation of the suture, anastomosis and mucosa control is promising in minimally invasive approaches of upper GI surgery. Enucleation of esophageal and gastric intramural tumors carries the risk of mucosal damage and perforation. Manual or stapled anastomoses carry a certain risk of leakage. The risk is increased in vascular compromise and stapler line insufficiency. The vascular compromise can be evaluated by endoscopy with eventual indocyanine green viewing [69]. The way to evaluate the anastomosis may be only technical (color staining, air leak test under water level) [70] with questionable outcomes. Conveniently, IOG offers direct visual control with the air leak test, which can be enforced by navigation of the surgical suture or even endoscopic reinforcement of the insufficiency of the stapled anastomosis or suture (hemoclips, over-the-scope clips, endoscopic suture). The general scientific problem of insufficient evidence remains, with the exception of bariatric surgery, which offers large series of promising data [71, 72]. The reliability of extrapolation to the oncosurgical anastomotic complication remains unclear [73].

Navigation of sentinel lymph node harvesting

Sentinel lymph node (SLN) harvesting in the upper gastrointestinal tract still remains of uncertain significance [74, 75]. The most appropriate way to evaluate the SLN remains endoscopic targeted injection, no matter which type of tracer we use. We have evaluated the sentinel lymph node in 2 patients with early esophageal cancer, in both with successful visualization [29, 76]. Further evolution of the tracer and image-guided lymphatic mapping seems to be promising for the future, including function-preserving gastric oncological surgery [77].

Further indications for IOG

Further IOG indications may include assistance in Heller myotomy for achalasia [78–80], volvulus of the stomach [81], duodenal diverticula [82], intraoperative foreign body extraction [83] and rare causes of bleeding [84, 85]. Pediatric indications are targeted in a more distinct way to inherited pathologies [1, 86]. Following the literature, they include esophageal atresia, tracheoesophageal fistulae, esophageal diverticula and perforations, gastroesophageal reflux disease, gastrointestinal bleeding, atypical duodenal and jejunal webs. In both groups, many other possible indications may arise according to the requirements of individual cases.
Morbidity of IOG does not exceed the morbidity of conventional gastroscopy in specific indications. The possibility of surgical control and possible direct surgical therapy has the potential to decrease possible perforation. The observed mortality is usually not attributed to sole endoscopy, as experienced in our cohort.
General recommendations following the literature references and our experience are summarized in Table IV. Further studies should reveal anastomotic testing in oncological cases, studies on reinforcement of the anastomosis, development of new combined minimally invasive resection techniques and pediatric indications for IOG.

Conclusions

Despite a heterogenic cohort of patients, we distinguish IOG as a meaningful complementary method in the interventional treatment of upper gastrointestinal tract pathology. It allows a decrease in the conversion rate, provides minimally invasive operations and enables individualization of treatment. The IOG requires extensive cooperation between the surgeon and endoscopist and is demanding on technical skills. Education of surgical endoscopists should be standardized. Further studies to evaluate possible wider and interventional indications are recommended.

Conflict of interest

The authors declare no conflict of interest.

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Received: 30.06.2017, accepted: 16.10.2017.
Copyright: © 2018 Fundacja Videochirurgii This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) License (http://creativecommons.org/licenses/by-nc-sa/4.0/), allowing third parties to copy and redistribute the material in any medium or format and to remix, transform, and build upon the material, provided the original work is properly cited and states its license.
  
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