Preoperative embolization of gastric arteries for esophageal cancer

Short-term Outcomes of Different Techniques for Gastric Ischemic Preconditioning Before Esophagectomy: A Network Meta-analysis

BACKGROUND

Ischemia at the anastomotic site plays a critical role determinant in the development of anastomosis-related complications after esophagectomy. Gastric ischemic conditioning (GIC) before esophagectomy has been described to improve the vascular perfusion at the tip of the gastric conduit with a potential effect on anastomotic leak (AL) and stenosis (AS) risk minimization. Laparoscopic (LapGIC) and angioembolization (AngioGIC) techniques have been reported.

PURPOSE

Compare short-term outcomes among different GIC techniques.

MATERIALS AND METHODS

Systematic review and network meta-analysis. One-step esophagectomy (noGIC), LapGIC, and AngioGIC were compared. Primary outcomes were AL, AS, and gastric conduit necrosis (GCN). Risk ratio (RR) and weighted mean difference (WMD) were used as pooled effect size measures, whereas 95% credible intervals (CrIs) were used to assess relative inference.

RESULTS

Overall, 1760 patients (14 studies) were included. Of those, 1028 patients (58.4%) underwent noGIC, 593 (33.6%) LapGIC, and 139 (8%) AngioGIC. AL was reduced for LapGIC versus noGIC (RR=0.68; 95% CrI 0.47-0.98) and AngioGIC versus noGIC (RR=0.52; 95% CrI 0.31-0.93). Similarly, AS was reduced for LapGIC versus noGIC (RR=0.32; 95% CrI 0.12-0.68) and AngioGIC versus noGIC (RR=1.30; 95% CrI 0.65-2.46). The indirect comparison, assessed with the network methodology, did not show any differences for LapGIC versus AngioGIC in terms of postoperative AL and AS risk. No differences were found for GCN, pulmonary complications, overall complications, hospital length of stay, and 30-day mortality among different treatments.

CONCLUSIONS

Compared to noGIC, both LapGIC and AngioGIC before esophagectomy seem equivalent and associated with a reduced risk for postoperative AL and AS.

Pilot Trial on Ischemic Conditioning of the Gastric Conduit in Esophageal Cancer: Feasibility and Impact on Anastomotic Leakage (TIGOAL-I)

Objective

To evaluate the feasibility, safety, and effectiveness of gastric conditioning using preoperative arterial embolization (PAE) before McKeown esophagectomy at a tertiary university hospital.

Background

Cervical anastomotic leakage (AL) is a common complication of esophagectomy. Limited clinical evidence suggests that gastric conditioning mitigates this risk.

Methods

This pilot randomized clinical trial was conducted between April 2016 and October 2021 at a single-center tertiary hospital. Eligible patients with resectable malignant esophageal tumors, suitable for cervical esophagogastrostomy, were randomized into 2 groups: one receiving PAE and the other standard treatment. The primary endpoints were PAE-related complications and incidence of cervical AL.

Results

The study enrolled 40 eligible patients. PAE-related morbidity was 10%, with no Clavien-Dindo grade III complications. Cervical AL rates were similar between the groups (35% vs 25%, P = 0.49), even when conduit necrosis was included (35% vs 35%, P = 1). However, AL severity, including conduit necrosis, was higher in the control group according to the Clavien-Dindo ≥IIIb (5% vs 30%, P = 0.029) and Comprehensive Complication Index (20.9 vs 33.7, P = 0.01). No significant differences were found in other postoperative complications, such as pneumonia or postoperative mortality.

Conclusions

PAE is a feasible and safe method for gastric conditioning before McKeown minimally invasive esophagectomy and shows promise for preventing severe AL. However, further studies are required to confirm its efficacy.

Reducing Conduit Ischemia and Anastomotic Leaks in Transhiatal Esophagectomy: Six Principles

BACKGROUND

Transhiatal esophagectomy (THE) is an accepted approach for distal esophageal (DE) and gastroesophageal junction (GEJ) cancers. Its reported weaknesses are limited loco-regional resection and high anastomotic leak rates. We have used laparoscopic assistance to perform a THE (LapTHE) as our preferred method of resection for GEJ and DE cancers for over 20 years. Our unique approach and experience may provide technical insights and perhaps superior outcomes.

METHODS

We reviewed all patients who underwent LapTHE for DE and GEJ malignancy over 10 years (2011-2020). We included 6 principles in our approach: (1) minimize dissection trauma using laparoscopy; (2) routine Kocher maneuver; (3) division of lesser sac adhesions exposing the entire gastroepiploic arcade; (4) gaining excess conduit mobility, allowing resection of proximal stomach, and performing the anastomosis with a well perfused stomach; (5) stapled side-to-side anastomosis; and (6) routine feeding jejunostomy and early oral diet.

RESULTS

One hundred and forty-seven patients were included in the analysis. The median number of lymph nodes procured was 19 (range 5-49). Negative margins were achieved in all cases (95% confidence interval [CI] 98-100%). Median hospital stay was 7 days. Overall major complication rate was 24% (17-32%), 90-day mortality was 2.0% (0.4-5.8%), and reoperation was 5.4% (2.4-10%). Three patients (2.0%, 0.4-5.8%) developed anastomotic leaks. Median follow-up was 901 days (range 52-5240). Nine patients (6.1%, 2.8-11%) developed anastomotic strictures.

CONCLUSIONS

Routine use of LapTHE for DE and GEJ cancers and inclusion of these six operative principles allow for a low rate of anastomotic complications relative to national benchmarks.

Laparoscopic ischemic conditioning prior esophagectomy in selected patients: the ISCON trial

Anastomotic leakage (AL) after esophagectomy is the most impactful complication after esophagectomy. Ischemic conditioning (ISCON) of the stomach >14 days prior to esophagectomy might reduce the incidence of AL. The current trial was conducted to prospectively investigate the safety and feasibility of laparoscopic ISCON in selected patients. This international multicenter feasibility trial included patients with esophageal cancer at high risk for AL with major calcifications of the thoracic aorta or a stenosis in the celiac trunk. Patients underwent laparoscopic ISCON by occlusion of the left gastric and the short gastric arteries followed by esophagectomy after an interval of 12-18 days. The primary endpoint was complications Clavien-Dindo ≥ grade 2 after ISCON and before esophagectomy. Between November 2019 and January 2022, 20 patients underwent laparoscopic ISCON followed by esophagectomy. Out of 20, 16 patients (80%) underwent neoadjuvant treatment. The median duration of the laparoscopic ISCON procedure was 45 minutes (range: 25-230). None of the patients developed intraoperative or postoperative complications after ISCON. Hospital stay after ISCON was median 2 days (range: 2-4 days). Esophagectomy was completed in all patients after a median of 14 days (range: 12-28). AL occurred in three patients (15%), and gastric tube necrosis occurred in one patient (5%). In hospital, the 30-day and 90-day mortalities were 0%. Laparoscopic ISCON of the gastric conduit is feasible and safe in selected esophageal cancer patients with an impaired vascular status. Further studies have to prove whether this innovative strategy aids to reduce the incidence of AL.

Effect of gastric ischemic conditioning prior to esophagectomy: systematic review and meta-analysis

Ischemia at the anastomotic site is thought to be a protagonist in the development of anastomosis-related complications while different strategies to overcome this problem have been reported. Gastric ischemic conditioning (GIC) prior to esophagectomy has been described with this intent. Evaluate the effect of GIC on anastomotic complications after esophagectomy. Scopus, Web of Science, MEDLINE, and PubMed were investigated up to March 31st, 2023. We considered articles that appraised short-term outcomes after GIC vs. no GIC in patients undergoing esophagectomy. Anastomotic leak (AL), anastomotic stricture (AS), and gastric conduit necrosis (GCN) were primary outcomes. Risk ratio (RR) and standardized mean difference (SMD) were used as pooled effect size measures, whereas 95% confidence intervals (95% CIs) were used to calculate related inference. Fourteen studies (1760 patients) were included. Of those, 732 (41.6%) underwent GIC, while 1028 (58.4%) underwent one-step esophagectomy. Compared with no GIC, GIC was related to a reduced RR for AL (R RR = 0.63; 95% CI 0.47-0.86; p < 0.01) and AS (RR = 0.51; 95% CI 0.29-0.91; p = 0.02), whereas no differences were found for GCN (RR = 0.56; 95% CI 0.19-1.61; p = 0.28). Postoperative pneumonia (RR = 1.09; p = 0.99), overall complications (RR = 0.87; p = 0.19), operative time (SMD - 0.58; p = 0.07), hospital stay (SMD 0.66; p = 0.09), and 30-day mortality (RR = 0.69; p = 0.22) were comparable. GIC prior to esophagectomy seems associated with a reduced risk for AL and AS. Further studies are necessary to identify the subset of patients who can benefit from this procedure, the optimal technique, and the timing of GIC prior to esophagectomy.

Cancers œsophagiens : nouveautés et défis des prises en charge chirurgicales

Surgical resection of esophageal carcinoma is one of the mainstays of curative treatment for these cancers. During the last decade, numerous improvements in surgical approaches and perioperative management of these patients have resulted in a decrease in postoperative morbidity and mortality. Thus, centralization of patients with esophagogastric adenocarcinoma in high volume center, development of minimally invasive surgery and improvements in surgical imaging have led to reduce mortality rate, major pulmonary complication rate and postoperative chylothorax rate. Optimization of postoperative management with enhanced recovery programs has meanwhile reduced the rate of major postoperative complication and the hospital length of stay. The objective of this review is to give an overview of novelties and challenges regarding surgical management of patients with esophageal carcinoma.

Gastric ischemic conditioning prior to esophagectomy reduces anastomotic leaks and strictures: a systematic review and meta-analysis

BACKGROUND

Gastric ischemic conditioning (GIC) is a strategy to promote neovascularization of the gastric conduit to reduce the risk of anastomotic complications following esophagectomy. Despite a number of studies and reviews published on the concept of ischemic conditioning, there remains no clear consensus regarding its utility. We performed an updated systematic review and meta-analysis to determine the impact of GIC, particularly on anastomotic leaks, conduit ischemia, and strictures.

METHODS

A systematic search of MEDLINE, EMBASE, Scopus, Web of Science, and Cochrane Library was performed on February 5th, 2020 by a university librarian after selection of key search terms with the research team. Inclusion criteria included human participants undergoing esophagectomy with gastric conduit reconstruction, age ≥ 18, N ≥ 5, and GIC performed prior to esophagectomy. Our primary outcome of interest was anastomotic leaks. Our secondary outcome was gastric conduit ischemia, anastomotic strictures, and overall survival. Meta-analysis was performed with RevMan 5.4.1 using a Mantel-Haenszel fixed-effects model.

RESULTS

A total of 1712 preliminary studies were identified and 23 studies included for final review. GIC was performed in 1178 (53.5%) patients. Meta-analysis revealed reduced odds of anastomotic leaks (OR 0.67; 95% CI 0.46-0.97; I² = 5%; p = 0.03) and anastomotic strictures (OR 0.48; 95% CI 0.29-0.80; I² = 65%; p = 0.005). Meta-analysis revealed no difference in odds of conduit ischemia (OR 0.40; 95% CI 0.13-1.23; I² = 0%; p = 0.11) and no difference in odds of overall survival (OR 0.54; 95% CI 0.29-1.02; I² = 22%; p = 0.06).

CONCLUSION

GIC is associated with reduced odds of anastomotic leaks and anastomotic strictures and may decrease morbidity in patients undergoing esophagectomy. Further prospective randomized trials are needed to better identify the optimal patient population, timing, and techniques used to best achieve GIC.

A Novel Technique to Improve Anastomotic Perfusion Prior to Esophageal Surgery: Hybrid Ischemic Preconditioning of the Stomach. Preclinical Efficacy Proof in a Porcine Survival Model

Simple Summary

Esophagectomy has a high rate of anastomotic complications thought to be caused by poor perfusion of the gastric graft, which is used to restore the continuity of the gastrointestinal tract. Ischemic gastric preconditioning (IGP), performed by partially destroying preoperatively the gastric vessels either by means of interventional radiology or surgically, might improve the gastric conduit perfusion. Both approaches have downsides. The timing, extent and mechanism of IGP remain unclear. A novel hybrid IGP method combining the advantages of the endovascular and surgical approach was introduced in this study. IGP improves unequivocally the mucosal and serosal blood-flow at the gastric conduit fundus by triggering new vessels formation. The proposed timing and extent of IGP were efficacious and might be easily applied to humans. This novel minimally invasive IGP technique might reduce the anastomotic leak rate of patients undergoing esophagectomy, thus improving their overall oncological outcome.

Abstract

Esophagectomy often presents anastomotic leaks (AL), due to tenuous perfusion of gastric conduit fundus (GCF). Hybrid (endovascular/surgical) ischemic gastric preconditioning (IGP), might improve GCF perfusion. Sixteen pigs undergoing IGP were randomized: (1) Max-IGP (n = 6): embolization of left gastric artery (LGA), right gastric artery (RGA), left gastroepiploic artery (LGEA), and laparoscopic division (LapD) of short gastric arteries (SGA); (2) Min-IGP (n = 5): LGA-embolization, SGA-LapD; (3) Sham (n = 5): angiography, laparoscopy. At day 21 gastric tubulation occurred and GCF perfusion was assessed as: (A) Serosal-tissue-oxygenation (StO₂) by hyperspectral-imaging; (B) Serosal time-to-peak (TTP) by fluorescence-imaging; (C) Mucosal functional-capillary-density-area (FCD-A) index by confocal-laser-endomicroscopy. Local capillary lactates (LCL) were sampled. Neovascularization was assessed (histology/immunohistochemistry). Sham presented lower StO₂ and FCD-A index (41 ± 10.6%; 0.03 ± 0.03 respectively) than min-IGP (66.2 ± 10.2%, p-value = 0.004; 0.22 ± 0.02, p-value < 0.0001 respectively) and max-IGP (63.8 ± 9.4%, p-value = 0.006; 0.2 ± 0.02, p-value < 0.0001 respectively). Sham had higher LCL (9.6 ± 4.8 mL/mol) than min-IGP (4 ± 3.1, p-value = 0.04) and max-IGP (3.4 ± 1.5, p-value = 0.02). For StO₂, FCD-A, LCL, max- and min-IGP did not differ. Sham had higher TTP (24.4 ± 4.9 s) than max-IGP (10 ± 1.5 s, p-value = 0.0008) and min-IGP (14 ± 1.7 s, non-significant). Max- and min-IGP did not differ. Neovascularization was confirmed in both IGP groups. Hybrid IGP improves GCF perfusion, potentially reducing post-esophagectomy AL.

Gastric ischemic preconditioning may reduce the incidence and severity of anastomotic leakage after οesophagectomy: a systematic review and meta-analysis

Anastomotic leakage after esophagectomy is a severe and life-threatening complication. Gastric ischemic preconditioning is a strategy for the improvement of anastomotic healing. Aim of this systematic review and meta-analysis is to investigate the impact of gastric ischemic preconditioning on postoperative morbidity. A systematic literature search was performed to identify studies comparing patients undergoing gastric ischemic preconditioning before esophagectomy with nonpreconditioned patients. Meta-analysis was conducted for the overall incidence of anastomotic leakage, severe anastomotic leakage, anastomotic stricture, postoperative morbidity, and mortality. Mantel-Haenszel odds ratios (ORs) and 95% confidence intervals (CIs) were calculated. Subgroup analyses were performed concerning preconditioning technique, the interval between preconditioning and surgery and the extent of preconditioning. Fifteen cohort studies were identified. Gastric preconditioning was associated with reduced overall incidence of anastomotic leakage (OR 0.73; 95% CI, 0.53-1.0; P = 0.050) and severe anastomotic leakage (OR 0.27; 95% CI, 0.14-0.50; P < 0.010), but not with anastomotic stricture (OR 1.18; 95% CI 0.38 to 3.66; P = 0.780), major postoperative morbidity (OR 1.03; 95% CI 0.45 to 2.36; P = 0.940) or mortality (OR 0.69; 95% CI 0.39 to 1,23; P = 0.210). Subgroup analyses did not identify any differences between embolization and ligation while increasing the interval between preconditioning and esophagectomy as well as the extent of preconditioning might be beneficial. Gastric ischemic preconditioning may be associated with a reduced incidence of overall and severe anastomotic leakage. Randomized studies are necessary to further evaluate its impact on leakage, refine the technique and define patient populations that will benefit the most.

Management of Complications After Esophagectomy

Esophagectomy is a complex operation with many potential complications. Early recognition of postoperative complications allows for the best chance for patient survival. Diagnosis and management of conduit complications, including leak, necrosis, and conduit-airway fistulae, are reviewed. Other common complications, such as chylothorax and recurrent laryngeal nerve injury, also are discussed.

Critical appraisal of gastric conduit ischaemic conditioning (GIC) prior to oesophagectomy: A systematic review and meta-analysis

INTRODUCTION

Anastomotic leaks remain a major complication following oesophagectomy, accounting for high morbidity and mortality. Recently, gastric ischaemic conditioning (GIC) has been proposed to improve anastomotic integrity through neovascularisation of the gastric conduit. This systematic review and meta-analysis aim to determine the impact of GIC on postoperative outcomes following oesophagectomy.

METHODS

A systematic literature search was performed to identify studies reporting GIC for any indication of oesophageal resection up to April 25, 2019. The primary outcome was anastomotic leak. Secondary outcomes were conduit necrosis, anastomotic strictures, overall and major complications or in-hospital mortality. Meta-analyses were conducted using random-effects modelling.

RESULTS

Nineteen studies reported on GIC, of which 13 were comparative studies. GIC was performed through ligation in 13 studies and embolisation in six studies. GIC did not appear to reduce anastomotic leakages (OR 0.80, CI_95: 0.51-1.24, p = 0.3), anastomotic strictures (OR 0.75, CI_95: 0.35-1.60, p = 0.5), overall complications (OR 1.02, CI_95: 0.48-2.16, p = 0.9), major complications (OR 1.06, CI_95: 0.53-2.11, p = 0.9), or in-hospital mortality (OR 0.70, CI_95: 0.32-1.53, p = 0.4). However, GIC was associated with reduced rates of conduit necrosis (OR 0.30, CI_95: 0.11-0.77, p = 0.013).

CONCLUSION

GIC does not appear to reduce overall rates of anastomotic leakage after oesophagectomy but seems to reduce severity of leakages. More in depth studies are recommended.

Ischaemic conditioning of the stomach previous to esophageal surgery

A gastric conduit is most frequently used for reconstruction in oesophageal surgery, and ischemia of the conduit is the most fragile aspect of the esophagogastric anastomosis with as consequence the anastomotic leakage. In order to avoid it, the concept of ischaemic conditioning of the stomach previous to surgery has been designed. The basis of ischemic conditioning is that interrupting vascularization of the stomach before making the anastomosis eases the gastric fundus adaptation to ischemic conditions. It consists of the interruption of the principal feeding arteries of the stomach (except the right gastroepiploic artery) weeks before esophagectomy. Previously published literature contemplates two different techniques: angiographic embolization or laparoscopic ligation or division of vessels. In this study, the anatomic and physio-pathologic background of ischemic preconditioning is described and the published current evidence is reviewed.

Comparison of cervical anastomotic leak and stenosis after oesophagectomy for carcinoma according to the interval of the stomach ischaemic conditioning

Background Stomach preparation by ischaemic conditioning prior to oesophageal resection represents a potential method of reducing the risk of anastomotic complications. This study compares the results of the anastomotic complications of cervical anastomosis after oesophagectomy with a short interval after ischaemic conditioning (group S) and a long interval (group L). Methods Subjects undergoing oesophagectomy for carcinoma after ischaemic conditioning were divided into two groups. Group S had a median interval between ischaemic conditioning and resection of 20 days, while for group L the median interval was 49 days. Anastomotic leak and anastomotic stenosis in relation to the interval between ischaemic conditioning and actual resection were followed. Results After ischaemic conditioning, 33 subjects in total underwent surgery for carcinoma; 19 subjects in group S and 14 subjects in group L. Anastomotic leak incidence was comparable in both groups. Anastomotic stenosis occurred in 21% of cases in group S and 7% of cases in group L (not statistically significant). Conclusions A long interval between ischaemic conditioning and oesophagectomy does not adversely affect the postoperative complications. A lower incidence of anastomosis stenoses was found in subjects with a longer interval, however, given the size of our sample, the statistical significance was not demonstrated. Both groups seem comparable in surgical procedure course and postoperative complications.

Does gastric conditioning decrease the incidence of cervical oesophagogastric anastomotic leakage?

INTRODUCTION

Oesophageal reconstruction by gastroplasty with cervical anastomosis has a higher incidence of dehiscence. The aim of the study is to analyse the incidence of anastomotic leakage in patients undergoing gastroplasty with cervical anastomosis following angiographic ischaemic conditioning of the gastric conduit.

METHODS

Prospective analysis of patients who underwent gastric conditioning two weeks prior to oesophageal reconstruction, from January 2001 to January 2014. The conditioning was performed by angiographic embolization of the left and right gastric artery, and splenic artery. The main variable analysed was the incidence of anastomotic leakage in patients undergoing gastroplasty with cervical anastomosis. Secondary variables analysed were the result of the conditioning, complications arising from that procedure and in the postoperative period, and mean length of postconditioning and postoperative hospital stay.

RESULTS

Gastric conditioning was indicated in 97 patients, with neoplasia being the most frequent aetiology motivating the oesophageal reconstruction (76%). 96 procedures were successfully carried out, arterial embolization was complete in 80 (83%). The morbidity rate was 13%, with no mortality. Postoperative morbidity was 45%; the most frequent complications associated with the surgery were respiratory problems. Six (7%) patients experienced cervical fistula, and all received conservative treatment. The rate of postoperative mortality was 7%.

CONCLUSIONS

In our serie the incidence of anastomotic leakage in patients undergoing gastroplasty with cervical anastomosis following angiographic ischaemic conditioning is 7%. Angiographic ischaemic conditioning is a procedure with acceptable morbidity.

Gastric Preconditioning in Advance of Esophageal Resection-Systematic Review and Meta-Analysis

BACKGROUND

Anastomotic leakage is one of the most severe complications following esophageal resection. Among other strategies, gastric ischemic preconditioning has been proposed to improve anastomotic integrity. The aim of this systematic review is to investigate whether gastric preconditioning has influence on peri- or postoperative outcomes after esophageal resection.

METHODS

A systematic literature search was performed to identify studies comparing gastric preconditioning with non-preconditioned patients for any indication of esophageal resection. Random-effects meta-analyses were conducted for main outcomes.

RESULTS

Gastric preconditioning did not reduce anastomotic leakages (OR 0.76; 95%-CI 0.51 to 1.13; p = 0.18), anastomotic strictures (OR 1.10; 95%-CI 0.58 to 2.10; p = 0.76;), major complications (OR 1.14; 95%-CI 0.60 to 2.14; p = 0.69), or in-hospital mortality (OR 0.62; 95%-CI 0.28 to 1.40; p = 0.25). However, preconditioning reduced the rate of severe leaks requiring reoperation (OR 0.20; 95%-CI 0.08 to 0.53; p = 0.001). Increasing the period between preconditioning and esophageal resection over 2 weeks did not reduce anastomotic leakage compared to shorter waiting times (OR 0.65; 95%-CI 0.38 to 1.13; p = 0.13).

CONCLUSION

With current evidence, gastric preconditioning does not seem to reduce overall rates of anastomotic leakage after esophageal resection but seems to reduce severity of leakages.

Ischemic Gastric Conditioning by Preoperative Arterial Embolization Before Oncologic Esophagectomy: A Single-Center Experience

PURPOSE

Surgical esophagectomy is the gold standard treatment of early-stage esophageal cancer. The procedure is complicated with significant morbidity; the most severe complication being the anastomotic leakage. Anastomotic fistulas are reported in 5-25% of cases and are mainly due to gastric transplant ischemia. Here, we report our experience of ischemic pre-conditioning using preoperative arterial embolization (PreopAE) before esophagectomy.

MATERIALS AND METHODS

The medical records of all patients who underwent oncologic esophagectomy from 2008 to 2015 were retrospectively reviewed. Patients were divided into two groups: patients who received PreopAE, and a control group of patients who did not benefit from ischemic pre-conditioning. The target arteries selected for PreopAE were the splenic artery, left gastric artery, and right gastric artery. Evaluation of the results was based on anastomotic leakage, postoperative mortality, technical success of PreopAE, and complications related to the embolization procedure.

RESULTS

Forty-six patients underwent oncologic esophagectomy with PreopAE and 13 patients did not receive ischemic conditioning before surgery. Thirty-eight PreopAE were successfully performed (83%), but right gastric artery embolization failed for 8 patients. Anastomotic leakage occurred in 6 PreopAE patients (13%) and in 6 patients (46%) in the control group (p = 0.02). The mortality rate was 2% in the PreopAE group and 23% in the control group (p = 0.03). Eighteen patients suffered from partial splenic infarction after PreopAE, all treated conservatively.

CONCLUSION

Preoperative ischemic conditioning by arterial embolization before oncologic esophagectomy seems to be effective in preventing anastomotic leakage.

Ischemic Conditioning of the Stomach in the Prevention of Esophagogastric Anastomotic Leakage After Esophagectomy

Esophagectomy with esophagogastric anastomosis is a major procedure, and its most feared complication is anastomotic leakage. Ischemic conditioning of the stomach is a method used with the aim of reducing the risk of leakage. It consists of partial gastric devascularization through embolization or laparoscopy followed by esophagectomy and anastomosis at a second stage, thus providing the time for the gastric conduit to adapt to the acute ischemia at the time of its formation. This review analyzes the information from all currently available experimental and clinical studies with the purpose of assessing the current role of the technique and to provide future recommendations.

Management of Conduit Necrosis Following Esophagectomy

The management of conduit necrosis during or after esophagectomy requires the assembly of a multidisciplinary team to manage nutrition, sepsis, intravenous access, reconstruction, and recovery. Reconstruction is most often performed as a staged procedure. The initial surgery is likely to involve esophageal diversion onto the chest where possible, making an effort to preserve esophageal length. Optimization of patients before reconstruction enhances outcomes following reconstruction with either jejunum or colon after gastric conduit failure. Maintaining enteral access for feeding at all times is imperative. Management of patients should be performed at high-volume esophageal centers performing regular reconstructions.

Gastric Supply Manipulation to Modulate Ghrelin Production and Enhance Vascularization to the Cardia

Introduction. Selective embolization of the left-gastric artery (LGA) reduces levels of ghrelin and achieves significant short-term weight loss. However, embolization of the LGA would prevent the performance of bariatric procedures because the high-risk leakage area (gastroesophageal junction [GEJ]) would be devascularized. Aim. To assess an alternative vascular approach to the modulation of ghrelin levels and generate a blood flow manipulation, consequently increasing the vascular supply to the GEJ. Materials and methods. A total of 6 pigs underwent a laparoscopic clipping of the left gastroepiploic artery. Preoperative and postoperative CT angiographies were performed. Ghrelin levels were assessed perioperatively and then once per week for 3 weeks. Reactive oxygen species (ROS; expressed as ROS/mg of dry weight [DW]), mitochondria respiratory rate, and capillary lactates were assessed before and 1 hour after clipping (T0 and T1) and after 3 weeks of survival (T2), on seromuscular biopsies. A celiac trunk angiography was performed at 3 weeks. Results. Mean (±standard deviation) ghrelin levels were significantly reduced 1 hour after clipping (1902 ± 307.8 pg/mL vs 1084 ± 680.0; P = .04) and at 3 weeks (954.5 ± 473.2 pg/mL; P = .01). Mean ROS levels were statistically significantly decreased at the cardia at T2 when compared with T0 (0.018 ± 0.006 mg/DW vs 0.02957 ± 0.0096 mg/DW; P = .01) and T1 (0.0376 ± 0.008mg/DW; P = .007). Capillary lactates were significantly decreased after 3 weeks, and the mitochondria respiratory rate remained constant over time at the cardia and pylorus, showing significant regional differences. Conclusions. Manipulation of the gastric flow targeting the gastroepiploic arcade induces ghrelin reduction. An endovascular approach is currently under evaluation.

Technical factors that affect anastomotic integrity following esophagectomy: systematic review and meta-analysis

BACKGROUND

Due to the significant contribution of anastomotic leak, with its disastrous consequences to patient morbidity and mortality, multiple parameters have been proposed and individually meta-analyzed for the formation of the ideal esophagogastric anastomosis following cancer resection. The purpose of this pooled analysis was to examine the main technical parameters that impact on anastomotic integrity.

METHODS

Medline, Embase, trial registries, and conference proceedings were searched. Technical factors evaluated included hand-sewn versus stapled esophagogastric anastomosis (EGA), cervical versus thoracic EGA, minimally invasive versus open esophagectomy, anterior versus posterior route of reconstruction and ischemic conditioning of the gastric conduit. The outcome of interest was the incidence of anastomotic leak, for which pooled odds ratios were calculated for each technical factor.

RESULTS

No significant difference in the incidence of anastomotic leak was demonstrated for the following technical factors: hand-sewn versus stapled EGA, minimally invasive versus open esophagectomy, anterior versus posterior route of reconstruction and ischemic conditioning of the gastric conduit. Four randomized, controlled trials comprising 298 patients were included that compared cervical and thoracic EGA. Anastomotic leak was seen more commonly in the cervical group (13.64 %) than in the thoracic group (2.96 %). Pooled analysis demonstrated a significantly increased incidence of anastomotic leak in the cervical group (pooled odds ratio = 4.73; 95 % CI 1.61-13.9; P = 0.005).

CONCLUSIONS

A tailored surgical approach to the patient's physiology and esophageal cancer stage is the most important factor that influences anastomotic integrity after esophagectomy.

Vascular endothelial growth factor expression following ischemic conditioning of the gastric conduit

The partial devascularization of the stomach, necessary for esophageal reconstruction with a gastric conduit, impairs microcirculation in the anastomotic region of the gastric fundus. Ischemic conditioning of the gastric tube is considered as a possible approach to improve microcirculation in the gastric mucosa. The aim of this study was to investigate whether ischemic conditioning induces neo-angiogenesis in the gastric fundus by expression of vascular endothelial growth factor (VEGF). Twenty patients with an esophageal carcinoma scheduled for esophagectomy and gastric reconstruction were included. To compare VEGF expression before and after ischemic conditioning, preoperative endoscopic biopsies were taken from the gastric fundus. The surgical procedure consisted of two separate steps, the complete gastric mobilization including partial devascularization of the stomach and after a delay of 4-5 days high transthoracic esophagectomy with intrathoracic gastric reconstruction (Ivor-Lewis procedure). The second tissue sample was obtained from the donut of the stapled esophagogastrostomy. For further work-up, preoperative biopsies and the gastric donuts were fixed in liquid nitrogen. Preoperative and intraoperative VEGF expression was measured by quantitative real-time reverse transcription-polymerase chain reaction (VEGF×100/β-actin) and results were compared using Wilcoxon test for paired samples. In all 40 specimens, a distinct expression of VEGF could be detected. Comparing the level of VEGF expression of the preoperative biopsies and postoperative tissue sample, no significant difference could be demonstrated following ischemic conditioning. In this model of ischemic conditioning with delayed reconstruction of 4-5 days, no induction of neo-angiogenesis could be demonstrated by measurement of VEGF expression.

[Staged oesophageal reconstruction for benign disease]

OBJECTIVES

To assess morbidity, mortality and quality of life after oesophageal reconstruction in patients with oesophageal exclusion for benign diseases.

PATIENTS AND METHODS

From 2002 to 2011, 20 of 24 patients with esophageal exclusion due to benign disease underwent a delayed reconstruction. We analyzed morbidity, mortality and health-related quality of life using the SF-36 questionnaire, before and after reconstruction.

RESULTS

Twenty patients were operated (16 men and 4 women) with an average age of 54.5 ± 10.5 years. Main causes of oesophageal disconnection were: 10 cases of caustics ingestion, 3 iatrogenic perforations, 4 anastomotic leaks and 3 cases with Boerhaave syndrome. Fourteen (60%) coloplasties and 6 (25%) gastric interpositions were performed with an average time of 212,2 ± 23.5 days after oesophageal exclusion. Pulmonary complications were the most common postoperative complications (55% patients) and according to the modified Clavien classification were divided into: grade 1 (10%), grade 2 (15%), grade 3a (40%), grade 3b (10%), and grade 4a (10%). The 30-day mortality (grade 5) of the series was 10%. Quality of life after reconstruction improved significantly in all analyzed domains of the SF-36 questionnaire.

CONCLUSIONS

Deferred oesophageal reconstruction is associated with a high morbidity and a mortality rate of 10%. After reconstruction, the quality of life improved in all the parameters evaluated.

Randomized controlled trial of laparoscopic gastric ischemic conditioning prior to minimally invasive esophagectomy, the LOGIC trial

INTRODUCTION

Minimally invasive esophagectomy (MIE) is a viable alternative to open resection for the management of esophagogastric cancer. However, the technique may relate to a higher incidence of ischemia-related gastric conduit complications. Laparoscopic ischemic conditioning (LIC) by ligating the left gastric vessels 2 weeks before MIE may have a protective role, possibly through an improvement of conduit perfusion. This project was designed to evaluate whether LIC influenced ultimate conduit perfusion.

METHODS

A randomized controlled trial was designed to compare MIE with LIC (L) against MIE without (N). The project began in May 2009 and was offered to consecutive patients with the objective of recruiting 22 in each arm. Sample size calculations were based on data from previous clinical series. The main outcome measure was perfusion recorded by validated laser Doppler fluximetry, at the fundus (F) and greater curve (G); performed at routine staging laparoscopy and every stage of an MIE. A perfusion coefficient measured as ratio at stage of MIE over baseline was used for statistical analysis.

RESULTS

Sixteen patients were recruited before an interim analysis of the trial data. At staging laparoscopy perfusion at F was higher than at G (p = 0.016). In the L cohort, an apparent rise in perfusion at G is observed post intervention (p = 0.176). At MIE, baseline perfusion is comparable for both arms; however, a significant drop is observed at both locations once the stomach is mobilized and exteriorized (p = 0.001). Once delivered at the neck, perfusion coefficient is approximately 38% of baseline levels. However, there was no discernible difference between the L (38.3 ± 12) and N (37.7 ± 16.8) cohorts (p = 0.798).

CONCLUSIONS

LIC does not translate into an improved perfusion of the gastric conduit tip. The benefits reported from published clinical series suggest that the resistance of the conduit to ischemia occurs through alternative possibly microcellular mechanisms.

Vascular conditioning of the stomach before esophageal reconstruction by gastric interposition

Gastric interposition with intrathoracic or cervical esophagogastrostomy is currently the preferred operation for reconstruction after esophagectomy. Anastomotic leaks however result from poor vascular supply to the proximal stomach. They are responsible for significant morbidity and mortality. 'Ischemic conditioning' of the interposed stomach has been proposed as a technique where the 'delay phenomenon' aims at improving the microcirculation of the gastric conduit and preventing anastomotic leakage. Experimental observations and clinical studies have been conducted to document the immediate effects and results of this approach. The aim of this work is to review the principles, pathophysiology, experimental, and clinical evidence related to vascular conditioning of the stomach prior to esophagectomy with gastric interposition and esophagogastric anastomosis. MEDLINE and PubMed were searched to identify articles related to vascular conditioning of the stomach. Cross references were added and reviewed to complete the reference list. The anatomic basis of ischemic conditioning, the prevalence of ischemic events on the gastric conduit, the methodology to assess the microcirculation before and after gastric devascularization, animal experiments, and clinical studies reported on this approach were reviewed. Ten experimental works, eleven clinical observations, four reviews, and two editorial commentaries addressing ischemic conditioning of the stomach were identified and reviewed. Experimental observations document improved microcirculation to the proximal stomach following partial gastric devascularization. Clinical reports show the feasibility and relative safety of gastric ischemic conditioning. Preliminary observations suggest potential improvements to the gastric microcirculation resulting from gastric ischemic conditioning. This approach may help prevent complications at the esophagogastric anastomosis. The actual level of evidence however cannot promote its use outside of clinical research protocols.

Preoperative gastric conditioning in cervical gastroplasty

To determine if ischemic conditioning of the stomach improves the morbidity, mortality, and the anastomotic failure in gastroplasties with cervical anastomosis. Analysis of all patients with indication for cervical gastroplasty during the period of study. In all cases, ischemic conditioning was performed by selective embolization. Anastomotic failure, morbidity, and mortality rates were studied. Thirty-nine consecutive patients were included. Angiography and selective embolization of the left gastric, right gastric, and splenic arteries were performed. Surgery was performed 2 weeks later. Four patients did not have a complete embolization; median hospital stay after conditioning was 1.24 ± 0.6 days. In two patients, surgery could not be completed. Of the 33 remaining, 29 had a posterior mediastinic gastroplasty and four through the anterior mediastinum. The most common morbidity was respiratory. Five patients had a reoperation and the mortality was 6%. One case of anastomotic leak was found (3%). The mean hospital stay was 17.5 days. Preoperative embolization is a technique with acceptable morbidity and a short hospital stay. In our experience it can reduce the incidence of the morbidity, mortality, and anastomotic leak in gastroplasties with cervical anastomosis. Prospective studies will be necessary to demonstrate the validity of this approach.

Ischemic conditioning of the gastric conduit prior to esophagectomy improves mucosal oxygen saturation

BACKGROUND

Ischemic conditioning of the gastric conduit is considered as a possible approach to improve perfusion of the gastric tube after esophagectomy. The aim of this study was to assess the impact of ischemic conditioning on gastric microcirculation in a clinical setting.

METHODS

Nineteen patients with an esophageal carcinoma were included. In a first laparoscopic procedure, the stomach was devascularized by complete gastric mobilization including ligation of the left gastric artery ("laparoscopic gastrolysis"). After a delay of 4 to 5 days, all patients underwent a transthoracic esophagectomy and reconstruction with the prepared gastric conduit (Ivor-Lewis). Mucosal oxygen saturation (MOS, sulfur dioxide in %) was quantitatively measured from the endoluminal side in well-defined areas of the antrum, corpus, and fundus using a tissue spectrometer located at the tip of a microprobe (LEA, Medizintechnik, Giessen, Germany). Under general anesthesia, sulfur dioxide measurement I was taken before, and measurement II after laparoscopic gastric mobilization; measurement III was done before esophagectomy and reconstruction 4 to 5 days later.

RESULTS

Before laparoscopic mobilization of the stomach the median MOS of the fundus was 72% (range, 49% to 86%). The MOS significantly decreased after devascularization of the stomach (median MOS, 38%; range, 9% to 86%). After 4 to 5 days, MOS almost recovered to values observed before gastric mobilization (median MOS, 62%; range, 48% to 85%). Compared with the fundus, no significant sulphur dioxide changes were detected in the corpus and antrum.

CONCLUSIONS

This study demonstrates that ischemic conditioning influences microcirculation of the gastric conduit and improves MOS in the anastomotic region at the time of reconstruction.

Esophageal replacement following gastric devascularization is safe, feasible, and may decrease anastomotic complications

BACKGROUND

Gastric transposition is the most common reconstruction after esophagectomy. Despite technical improvements, the incidence of anastomotic complications remains high. Gastric devascularization followed by esophageal resection and reconstruction has been proposed to minimize these complications.

METHODS

Thirty-two patients underwent minimally invasive esophagectomy, and seven high-risk patients were selected for laparoscopic gastric devascularization performed either 1 week (n = 5) or 12 weeks (n = 2) before esophageal resection. Primary outcomes included anastomotic leak and stricture.

RESULTS

Each patient underwent successful laparoscopic devascularization and subsequent esophagectomy. Devascularization required an average of 134 minutes with minimal operative blood loss. There were no complications following gastric devascularization or directly attributable to delay. None of the delay patients developed an anastomotic leak, compared to 16% of patients after immediate reconstruction (p = 0.258). One patient (14%) developed an anastomotic stricture that required endoscopic dilatation within the first year after surgery, compared to 12% of immediate reconstruction patients (p = 0.872).

CONCLUSION

In this series, all patients underwent successful delayed reconstruction following gastric devascularization without anastomotic leak. The absence of anastomotic leak in the delay group suggests that delayed conduit preparation can be accomplished safely while potentially reducing the morbidity associated with esophagectomy, but larger prospective studies are required to prove this definitively.

Ischemic preconditioning improves stability of intestinal anastomoses in rats

BACKGROUND

The aim of our study was to establish whether ischemic preconditioning (IPC) directly before performing a small bowel anastomosis has an effect on anastomotic stability and healing.

MATERIAL AND METHODS

Forty male Wistar rats were randomized to five groups: control (CO, n = 8) with preparation of the superior mesenteric artery (SMA) but without IPC. IPC groups had different intervals of ischemia (occlusion of the SMA) and reperfusion: 10 min ischemia and 20 min reperfusion (IPC10/20, n = 7), 10 min ischemia and 30 min reperfusion (IPC10/30, n = 8), 15 min ischemia and 20 min reperfusion (IPC15/20, n = 8), and 15 min ischemia and 30 min reperfusion (IPC15/30, n = 9). On the fourth postoperative day, the animals were relaparotomized: bursting pressure, hydroxyproline concentration, and histological ischemia mucosal injury scale of the anastomosis were assessed.

RESULTS

Four days after operation, the mean bursting pressure was 73 +/- 6 mmHg in the control group, whereas it was significantly higher in IPC10/20 (113 +/- 11 mmHg; p = 0.018), IPC10/30 (110 +/- 13 mmHg; p = 0.001), and IPC15/30 (124 +/- 9 mmHg; p = 0.003). IPC15/20 did not show a significant difference (63 +/- 2 mmHg; p = 0.4). We did not find a significant effect regarding hydroxyproline concentration, but IPC diminished mucosal injury.

CONCLUSIONS

IPC directly before performing a small bowel anastomosis has a time-dependent beneficial effect on anastomotic stability, thus indicating a new clinical approach to improve the healing process of intestinal anastomosis.

Laparoscopic partial gastric transection and devascularization in order to enhance its flow

Background

Esophagogastric fistula following an esophagectomy for cancer is very common. One of the most important factors that leads to its development is gastric isquemia. We hypothesize that laparoscopic gastric devascularization and partial transection is a safe operation that will enhance the vascular flow of the fundus of the stomach.

Method

Our study included eight pigs. Each animal had two operations. In the first one, a laparoscopic gastric devascularization and mobilization took place. Vascular flow was measured previous to the procedure and immediately after it with a laser doppler (endoscopic probe). After three weeks, a second operation took place. We re-measured the vascular flow and sent a sample of gastric fundus for histopathologic evaluation.

Results

The gastric fundus showed signs of neovascularization after both macroscopic and microscopic evaluation. These findings correlated with laser doppler measurements.

Conclusion

Laparoscopic gastric devascularization and partial transection is a safe procedure that increases the vascular flow of the stomach in a three week period. This finding can have a positive impact in terms of decreasing fistula formation.

Quantitative measurement of gastric mucosal microcirculation using a combined laser Doppler flowmeter and spectrophotometer

Anastomotic leakage after esophagectomy and esophagogastrostomy depends on the vascularization of the gastric conduit. So far, no adequate methods are available to monitor postoperatively mucosal microcirculation of the gastric conduit. The aim of this experimental study was to assess a recently developed microprobe with a microlight-guide spectrophotometer (O2C, Fa. LEA Medizintechnik, Giessen, Germany) to quantitatively measure gastric mucosal blood flow (MBF) and mucosal oxygen saturation (MOS) of different gastric areas. Eighteen patients without gastric pathology were included in this study. During conventional gastroscopy the microprobe was introduced via the working channel of a standard endoscope and positioned in well-defined areas of the antrum and fundus. The tip of the microprobe consisted of a combined laser Doppler and tissue spectrometer measuring continuously the MBF (perfusion units, PU) and MOS (SO(2), in %). The mean MOS of the antrum was significantly higher compared with the fundus (antrum: 82% +/- 7.9 standard deviation [SD], fundus: 72% +/- 10.4; P = 0.0002). The mean MBF was not significantly different between antrum and fundus (antrum: 201 PU +/- 40 SD, fundus: 223 PU +/- 29 SD). This study demonstrates the feasibility of the gastric O2C microprobe to measure parameters of gastric microcirculation from the endoluminal side.

Laparoscopic Gastric Ischemic Conditioning Prior to Esophagogastrectomy: Technique and Review

Esophagectomy can be associated with significant peri-operative morbidity such as leaks and strictures. Gastric ischemia as a result of gastric devascularization is one of the several contributing factors that may play a role in development of these complications. In an attempt to improve gastric tissue perfusion, a technique of gastric ischemic conditioning was proposed. For patients with esophageal cancer and at the time of laparoscopic staging, partial gastric devascularization is achieved by division of the left gastric vessels. Esophagectomy is subsequently performed several days after the gastric ischemic conditioning procedure. Our experience showed that preoperative ligation of left gastric vessels prior to esophagogastrectomy is technically feasible and safe and may decrease ischemic complications such as leaks and strictures.

[Second time esophageal reconstruction surgery: coloplasty and gastroplasty]

OBJECTIVE

To analyze the morbidity and mortality of second time esophageal reconstruction in an Esophagogastric Unit.

PATIENTS AND METHOD

Second time esophageal reconstruction surgery with coloplasty and gastroplasty was performed on 20 patients, from January 2001 to October 2006. The morbidity and mortality of each technique has been analyzed retrospectively.

RESULTS

The mean age of the 16 males and 4 women operated on was 54.3 +/- 17.5 years. The diagnoses at the first surgery were: 7 caustic ingestions, 7 Boerhaave syndrome, 3 iatrogenic perforations, 1 tracheal-esophageal fistula, 1 esophageal-jejunal dehiscence and 1 necrosis of the gastroplasty after transhiatal oesophagectomy. There were 14 (70%) right coloplasties, 4 (20%) left coloplasties and 2 (10%) gastroplasties with gastric conditioning. In 11 of the 20 patients gastroplasty was ruled out due to gastrectomy (8 cases) or previous gastric surgery (3 cases). It was noted on analyzing the morbidity: pleural effusion (65%), respiratory failure (45%), atelectasis (35%) and cervical anastomosis dehiscence (35%). Five patients were re-intervened: 3 due to intra-abdominal sepsis and 2 due to hemoperitoneum. Mortality was 10% (2 cases). In subsequent follow up there was 5% (1 case) of stenosis of the anastomosis.

CONCLUSIONS

Esophageal reconstruction technique which in specialist units has an acceptable mortality rate (10%) and an insignificant morbidity. Coloplasty was the technique most used on these patients.

Partial splenic embolization

Partial splenic embolization (PSE) is a non-surgical procedure developed to treat hypersplenism as a result of hepatic disease and thus avoid the disadvantages of splenectomy. A femoral artery approach is used for selective catheterization of the splenic artery. Generally, the catheter tip is placed as distally as possible in an intrasplenic artery. After an injection of antibiotics and steroids, embolization is achieved by injecting 2-mm gelatin sponge cubes suspended in a saline solution containing antibiotics. PSE can benefit patients with thrombocytopenia, esophagogastric varices, portal hypertensive gastropathy, encephalopathy, liver dysfunction, splenic aneurysm, and splenic trauma. The contraindications of PSE include secondary splenomegaly and hypersplenism in patients with terminal-stage underlying disease; pyrexia or severe infections are associated with a high risk of splenic abscess after PSE. Complications of PSE include daily intermittent fever, abdominal pain, nausea and vomiting, abdominal fullness, appetite loss, and postembolization syndrome. Decreased portal-vein flow and a rapid increase in the platelet count after excessive embolization may cause portal-vein or splenic-vein thrombosis.

Laparoscopic ischemic conditioning of the stomach for esophageal replacement

OBJECTIVES

A considerable percentage of morbidity and mortality after esophagectomy and gastric pull-up is due to leakage of the esophagogastrostomy, which is mainly caused by ischemia of the gastric fundus. Previous clinical studies demonstrated that impaired microcirculation of the gastric conduit almost recovers within the first 5 postoperative days. Therefore, this study was designed to improve gastric perfusion by laparoscopic ischemic conditioning of the stomach.

METHODS

The study group consisted of 83 patients with 44 esophageal adenocarcinomas and 39 squamous cell carcinomas. A total of 51% received neoadjuvant radiochemotherapy. First, all patients underwent laparoscopic mobilization of the stomach including the cardia and preparation of the gastric conduit. After a mean delay of 4.3 days (range, 3-7 days), a conventional right-sided transthoracic en bloc esophagectomy was performed. Reconstruction was done by gastric pull-up and high intrathoracic esophagogastrostomy.

RESULTS

Three conversions (3.6%) to open surgery were necessary during laparoscopic mobilization of the stomach. The reoperation rate was 2.4% (one relaparoscopy for control of a bleeding of the stapler line, one rethoracotomy for chylothorax). Two patients showed circumscribed necroses of the upper part of the fundus after gastric pull-up into the chest. These necroses were resected for reconstruction by esophagogastrostomy. Five patients (6.0%) developed small anastomotic leakages with minor clinical symptoms; however, the gastric conduits were well vascularized. All leakages healed after endoscopic stenting. Major postoperative complications were observed in 13.3% of the patients and the 90-day mortality was 0%.

CONCLUSION

Laparoscopic ischemic conditioning of the gastric conduit is feasible and safe and may contribute to the reduction of postoperative morbidity and mortality after esophagectomy and gastric pull-up.

Using the supercharge technique to additionally revascularize the gastric tube after a subtotal esophagectomy for esophageal cancer

BACKGROUND

Maintaining sufficient blood flow to the gastric tube after a subtotal esophagectomy for esophageal cancer is crucial for decreasing esophagogastric anastomotic leakage.

METHODS

After subtotal esophagectomy for esophageal cancer, the supercharge technique was performed in 21 esophageal reconstruction patients to additionally revascularize the gastric tube using the splenic artery and vein, external carotid artery, and internal jugular vein. Operative results of the supercharge group were retrospectively compared with those of the control group (patients not receiving the technique).

RESULTS

Both operation time and operative blood loss in the supercharge group were significantly longer and larger than those of the control group. However, the incidence of anastomotic leakage was significantly lower in the supercharge group than in the control group.

CONCLUSION

This practical supercharge technique reduces leakage during esophageal anastomosis.

Clinical review: Healing in gastrointestinal anastomoses, Part II

Complications arising from gastrointestinal anastomosis failures are a major source of morbidity and mortality. This review examines the effects of local blood flow on anastomotic healing, and discusses strategies for improving perfusion. Disruption of blood supply plays a significant role in the development of anastomotic leakage. Several methods have been suggested to improve perfusion. Omental pedicles have been employed as buttresses to promote angiogenesis, but efficacy in preventing anastomotic dehiscence has not been established. The administration of exogenous pharmacologic agents (such as vascular endothelial growth factor) is another potential strategy, although the oncological safety of this approach has been questioned. Two techniques which show promise in reducing anastomotic leakage rates include the vascular augmentation of grafts at risk for ischemia (supercharging) and ischemic conditioning (utilizing the delay phenomenon). Further studies of these strategies are needed to establish their efficacy and safety for routine use in gastrointestinal anastomoses.

Utilization of the delay phenomenon improves blood flow and reduces collagen deposition in esophagogastric anastomoses

OBJECTIVE

Complications of anastomotic healing are a common source of morbidity and mortality after esophagogastrostomy. The delay phenomenon is seen when a skin flap is partially devascularized in a staged procedure prior to its definitive placement, resulting in increased blood flow at the time of grafting. This effect may be applied to esophagogastrectomy, potentially reducing anastomotic complications.

SUMMARY BACKGROUND DATA

The purpose of this investigation was to apply the delay principle to the gastrointestinal tract, investigate mechanisms by which it occurs and examine the effects of delay on anastomotic healing.

METHODS

Thirty-seven opossums were assigned to Sham (n = 5), Immediate (n = 14), and Delay (n = 18) groups. Each underwent laparotomy and measurement of baseline gastric fundus blood flow. The Delay and Immediate animals underwent ligation of the left, right, and short gastric vessels and subsequent measurement of gastric fundus blood flow. The Delay group underwent repeat measurement of blood flow, esophagogastrectomy, gastric tubularization, and esophagogastrostomy 28 days after vessel ligation. The Immediate group completed the procedure immediately after vessel ligation. The anastomoses in both groups were harvested 32 days after esophagogastrostomy. The Sham group underwent blood flow measurement on initial laparotomy, followed by harvesting of esophagogastric junction 60 days later. Sections taken through the anastomoses were examined with trichrome-staining and immunohistochemistry (IHC) for actin. Collagen content of the gastric submucosa 5 mm below the anastomosis was quantified, and preservation of the muscularis propria and muscularis mucosa was determined histologically. Capillary content of the esophagogastric junction was quantified using IHC for vascular endothelium in the Delay and Sham groups.

RESULTS

Blood flow decreased by 73% following vessel ligation in Delay and Immediate groups. The Delay group had over 3 times the gastric blood flow of the Immediate group at the time of anastomosis at 16 (interquartile range [IQR] 11-17) versus 5, (IQR 5-6) mL/min/100 g (P = 0.000003). Two Immediate animals developed anastomotic leak and died; the Delay group had no complications. Submucosal collagen content in Sham, Delay, and Immediate groups were 57% (IQR 52-62), 65% (IQR 57-72), and 71% (IQR 60-82), respectively (P = 0.0004). The median distance of full-thickness atrophy of the muscularis propria was 0.10 mm (IQR 0-0.60 mm) in the Delay group and 0.53 mm (IQR 0.03-0.80 mm) in the Immediate group (P = 0.346). Five percent of the Delay group had atrophy of the muscularis mucosa, whereas 19% of Immediate animals had atrophy of this layer (P = 0.023). Compared with the Sham group, all Delay animals developed dilation of the right gastroepiploic artery and vein. A median of 27 (IQR 23-33) capillaries per 20x field was observed in the Sham fundus and 38 (IQR 31-46) in the Delay fundus (P = 0.037).

CONCLUSIONS

The delay effect is associated with both vasodilation and angiogenesis and results in increased blood flow to the gastric fundus prior to esophagogastric anastomosis. Animals undergoing delayed operations have less anastomotic collagen deposition and ischemic injury than those undergoing immediate resection. Clinical application of the delay effect in patients undergoing esophagogastrectomy may lead to a decreased incidence of leak and stricture formation.

Does celiac trunk stenosis correlate with anastomotic leakage of esophagogastrostomy after esophagectomy?

The formation of a gastric tube for esophageal replacement requires partial devascularization of the stomach and induces microcirculatory changes in the anastomotic region of the gastric fundus. The additional influence of celiac trunk stenosis on anastomotic healing has not been investigated. In total, 23 patients with an esophageal carcinoma underwent transthoracic esophagectomy. Reconstruction was performed by a gastric tube (x22) with cervical or thoracic esophagogastrostomy or colon interposition (x1). All patients had a selective mesenterico-celiacography preoperatively via puncture of the right femoral artery. Preoperative cardiovascular and pulmonary risk factors were assessed. Angiographic findings were correlated to postoperative anastomotic leakage of esophagogastrostomy (x22). In seven out of 23 patients (30.4%), a stenosis of the celiac trunk could be demonstrated (x3 stenosis of 50%, x4 stenosis > 80%). Except for one patient with an additional stenosis of the superior mesenteric artery of > 80%, none of the patients with celiac trunk stenosis developed a postoperative anastomotic leakage of the esophagogastrostomy. Coronary artery disease was the only preoperative risk factor to predict a stenosis of the celiac trunk. Isolated stenosis of the celiac trunk does not seem to impair circulation of the gastric tube.

Large hepatic ablation with bipolar saline-enhanced radiofrequency: an experimental study in in vivo porcine liver with a novel approach

SUMMARY BACKGROUND DATA

Radiofrequency ablation (RFA) is a relatively new technology for the local destruction of liver tumors. Development of recent devices has enabled the creation of larger lesions. Nevertheless, treating liver tumors larger than 2.5 cm in diameter often requires multiple overlapping ablations to encompass the tumor and the surrounding healthy tissue rim with an increasing risk of local recurrence.

MATERIAL AND METHODS

RFA (480 kHz) of the liver using our method was undertaken on a total number of 15 healthy farm pigs with (Group B, n = 8) or without (Group A, n = 5) the Pringle maneuver via laparotomy. The pigs were followed and euthanized on the seventh day of the experiment. Livers were removed for histological assessment. Time of the procedure, impedance, current, power output, energy output, temperatures in the liver, central temperature of the animal, volume size of the lesion, and delivered energy per lesion volume were determined and compared among groups. Additionally a regularity ratio (RR) was determined by gross examination of the specimen and scored (0-3) taking into account regularity and predictability of the ablation with pathologic assessment.

RESULTS

With both methods, ellipsoid lesions were created between the two probes. In both groups tissue impedance fell with time (r = -0.47, P < 0.01 and r = -0.34, P < 0.05, in Groups A and B, respectively). The mean lesion size achieved with the Pringle maneuver was the largest lesion size described in the literature for any RFA method in vivo and was greater in Group B than in Group A (123.22 cm(3) +/- 49.62 and 52.40 cm(3) +/- 23.59, respectively, P < 0.05). A better regularity and predictability evaluated by RR was observed in Group B compared to Group A (1.88 +/- 1.35 and 0.40 +/- 0.55, respectively, P < 0.05). Five major complications were described and attributed primarily to failure in isolation from hypertermic lesions.

CONCLUSIONS

Our new bipolar saline-enhanced electrode with Pringle maneuver achieves large hepatic ablations in in vivo pig liver. These large lesions are well-tolerated by the animal when thermal injuries to adjacent structures are avoided.

Role of angiographic techniques in the preoperative staging and management of gastrointestinal neoplasms

Gastrointestinal neoplasms are very common diseases, and their management does not usually require angiography for diagnostic and staging purposes. However, angiography may be required for further refinements in staging of vascular involvement or to obtain a detailed preoperative anatomy of the vessels. Finally, angiographic techniques may be useful for palliative or preoperative locoregional chemotherapy, and to treat hemorrhagic complications. This article reviews the capabilities and limits of angiographic techniques in the assessment and management of tumors of the alimentary tract.

Gastric conditioning

The etiology of esophagogastric anastomotic leaks is often multifactorial. However, occult ischemia of the gastric fundus is an important cause. In gastric conditioning, preliminary partial gastric devascularization is carried out 2-3 weeks before construction of the esophagogastric anastomoses. Gastric vascularity improves over this time. In animal studies, gastric conditioning has reduced the incidence of anastomotic leaks. Clinically, the concept of gastric conditioning can be used in several ways. Esophagectomy can be done at one stage, then a cervical esophagogastric anastomosis can be completed as a second-stage procedure. Pre-esophagectomy angiographic gastric artery embolization is another method of gastric conditioning. Finally, laparoscopic partial gastric devascularization can be done at the time of laparoscopic cancer staging. For gastric conditioning to be clinically useful, the benefit from reduction in leaks must be greater than the costs and morbidity of the conditioning procedure itself.