Esophageal replacement

Circumferential Esophageal Reconstruction Using a Tissue-engineered Decellularized Tunica Vaginalis Graft in a Rabbit Model

BACKGROUND

Pediatric surgeons have faced esophageal reconstruction challenges for decades owing to a variety of congenital and acquired conditions. This work aimed to introduce a reproducible and efficient approach for creating tissue-engineered esophageal tissue using bone marrow mesenchymal stem cells (BMSCs) cultured in preconditioned mediums seeded on a sheep decellularized tunica vaginalis (DTV) scaffold for partial reconstruction of a rabbit's esophagus.

METHODS

DTV was performed using SDS and Triton X-100 solutions. The decellularized grafts were employed alone (DTV group) or after recellularization with BMSCs cultured for 10 days in preconditioned mediums (RTV group) for reconstructing a 3 cm segmental defect in the cervical esophagus of rabbits (n = 20) after the decellularization process was confirmed. Rabbits were observed for one month, after which they were euthanized, and the reconstructed esophagi were harvested for histological analysis.

RESULTS

Six rabbits in the DTV group and eight rabbits in the RTV group survived until the end of the one-month study period. Despite histological examination demonstrating that both grafts completely repaired the esophageal defect, the RTV graft demonstrated a histological structure similar to that of the normal esophagus. The reconstructed esophagi in the RTV group revealed the arrangement of the different layers of the esophageal wall with the formation of newly formed blood vessels and Schwann-like cells.

CONCLUSION

DTV xenograft is a novel scaffold that promotes cell adhesion and differentiation and might be effectively utilized for regenerating esophageal tissue, paving the way for future clinical trials in pediatric patients.

Esophageal replacement in children - 27 years of experience in a University Hospital

INTRODUCTION

esophageal replacement in children is indicated when it is impossible to maintain the native esophagus, which in the pediatric population includes patients with esophageal atresia and esophageal caustic stenosis. The objective of this communication is to report the experience of a university service with two techniques of esophageal replacement.

METHODS

this is a retrospective study based on the revision of hospital files. The study population consisted of patients who underwent esophageal replacement from 1995 to 2022, at the Hospital de Clínicas of the State University of Campinas. The analyzed data were age, sex, underlying disease, technical aspects, complications, and long-term results.

RESULTS

during the study period, 30 patients underwent esophageal replacement. The most common underlying diseases were esophageal atresia (73.33%) and caustic stenosis (26.67%). Twenty-one patients underwent gastric transposition (70%), and nine underwent esophagocoloplasty (30%). The most frequent postoperative complication was fistula of the proximal anastomosis, which occurred in 14 patients. Most of the patients with fistulas had a spontaneous recovery. There were three deaths. Of the 27 survivors, 24 can feed exclusively by mouth.

CONCLUSION

esophageal replacement in children is a procedure with high morbidity and mortality. Esophagocoloplasty and gastric transposition have similar results and complications, with the exception of proximal anastomotic fistulas, which are generally self-resolving and are more common in esophagocoloplasty. The choice of the best surgical technique must be individualized according to the patients characteristics and the surgeons experience, as both techniques offer the ability to feed orally in the short or medium term.

Caustic ingestion leads to pneumonectomy and right colonic interposition, a unique case report

INTRODUCTION

Corrosive ingestion forms serious problem, with various outcomes depending on the time of diagnosis and treatment. We report here a case with rare and dangerous complications.

PRESENTATION OF CASE

A two-year-old girl came to our hospital, complaining of solids' dysphagia. Retrieving her medical history showed that she had ingested a corrosive liquid accidentally. Without knowing the nature of the ingested agent, the local doctor removed it, using nasal gastric tube. This procedure induced vomiting, which in turn led to more damage. She stayed in the area's hospital for 40 days with just supportive treatment. The radiological investigations suggested severe stenosis. The dilation was done, but the patient did not respond after three months of treatment. Therefore, a gastrostomy was done. The esophagus replacement was inevitable, but the parents refused the surgical approach. Three months later, she returned to our hospital complaining of a productive cough. The radiological investigations suggested destruction in the left lung with a high suspicion of tracheoesophageal fistula. The treatment was through a surgical approach by removing the damaged lung tissue and closing the tracheoesophageal fistula. The patient got better after a month of the surgery, which allowed us to replace the esophagus and close the tracheoesophageal fistula.

DISCUSSION

corrosive treatment varies a lot, depending on the patient's situation. Accurate treatment prevents severe and unexpected complications.

CONCLUSION

More stringent instructions should be enacted among medical providers, corrosive agents' producers, and the public to be more careful when dealing with corrosive chemicals.

Functional, nutritional, and developmental assessment of gastric transposition and colonic interposition: Long-term follow-up outcome analysis

PURPOSE

The choice of Esophageal replacement (ER) depends on surgeons' preference and patients' anatomical condition. A cross-sectional study was done to compare the long-term outcomes of two methods of ER, Gastric transposition (GT) and Colonic interposition (CI).

METHODS

Children who had undergone ER from January 1997 to December 2017 with a minimum of two-year post-ER follow-up were evaluated by anthropometry, hepatobiliary scintigraphy, gastroesophageal reflux study, gastric emptying test, pulmonary function test and blood tests.

RESULTS

Twenty-six (Male:female=17:9) children were recruited. The median age at ER was 13 months (interquartile range 9-40 months) and mean follow-up post-ER was 116.7 ± 76.4 months (range 24-247 months). GT:CI was done in 15(57.7%):11(42.3%) cases. A greater number of abnormal oral contrast studies (p = 0.02) and re-operations (p = 0.05) were documented as baseline characteristics with CI group. The presence of gastroesophageal reflux 9/23(39.1%), duodenogastric reflux 6/24(25%), delayed gastric emptying 6/25(24%), abnormal pulmonary function test 14/22(63.6%) were documented during the study period. However, there was no significant(p>0.05) difference in nutritional, developmental and functional outcomes of both operative methods of ER in the study.

CONCLUSION

Assessment of nutritional, developmental and functional parameters in children after ER reveals good long-term results. There was no significant difference in CI and GT.

LEVEL OF EVIDENCE

Comparative study; II.

Enhancing esophageal repair with bioactive bilayer mesh containing FGF

We aimed to prepare a bioactive and biodegradable bilayer mesh formed by fibroblast growth factor (FGF) loaded gelatin film layer, and poly ε-caprolactone (PCL) film layer, and to investigate its treatment efficacy on esophageal anastomosis. It is envisaged that the bioactive mesh in in vivo model would improve tissue healing in rats. The full thickness semicircular defects of 0.5 × 0.5 cm² were created in anterior walls of abdominal esophagus. The control group had abdominal esophagus isolated with distal esophageal blunt dissection, and sham group had primary anastomosis. In the test groups, the defects were covered with bilayer polymeric meshes containing FGF (5 μg/2 cm²), or not. All rats were sacrificed for histopathology investigation after 7 or 28 days of operation. The groups are coded as FGF(-)-7th day, FGF(+)-7th day, and FGF(+)-28th day, based on their content and operation day. Highest burst pressures were obtained for FGF(+)-7th day, and FGF(+)-28th day groups (p < 0.005) and decreased inflammation grades were observed. Submucosal and muscular collagen deposition scores were markedly increased in these groups compared to sham and FGF(-)-7th day groups having no FGF (p = 0.002, p = 0.001, respectively). It was proved that FGF loaded bioactive bilayer mesh provided effective repair, reinforcement and tissue healing of esophageal defects.

Experience in reconstruction of esophagus, epiglottis, and upper trachea due to caustic injuries in pediatric patients and establishment of algorithm

BACKGROUND

Unintentional swallowing of corrosive agents cause problems in the pediatric population. Swallowing dysfunction can be seen after injuring the pharynx and/or epiglottis which leads to the obstruction of esophagus. An algorithm was established taking into account the injury to the epiglottis and restoring gastrointestinal continuity with isolated or combine free and or supercharged jejunum flap, or supercharged colon transposition flap.

METHODS

Seventeen patients between the ages of 3 and 16 (mean age: 7.7) were treated between 1985 and 2019. Three different procedures were performed based on endoscopic findings; for patients with no or minimal damage to epiglottis, pedicled colon transposition was done in 12 cases. For patients with epiglottic scarring or edema, a two-stage reconstruction was performed. In the first stage, free jejunum flap was implemented to the pharynx to facilitate food passage, followed by a pedicled jejunum in two cases, or a pedicled colon transposition in two cases to provide gastrointestinal continuity. For one patient with severe epiglottic scarring, a free jejunal flap was used as a diversion conduit in the first stage, followed by supercharged colon transposition to restore gastrointestinal continuity.

RESULTS

Supercharged intestinal flaps were harvested with 3-4 cm of extra intestinal tissue than the measured thoracic portion in each individual in order to reach the hypopharyngeal region. The size of the free jejunal flaps were 10 cm. Oral feeding was initiated on the eighth postoperative day. Partial loss of the anterior wall of the jejunal flap was seen in one case, in which a free anterolateral thigh-vastus lateralis musculocutaneous flap was used for reconstruction. The mean follow-up time was 5.1 years and there was no stricture in the final outcome.

CONCLUSION

A competent epiglottis is essential for proper swallowing reflex. Meticulous microsurgical dissection and performing supercharged intestinal flaps provide a complication-free end result.

A narrative review of esophageal tissue engineering and replacement: where are we?

Long-gap esophageal defects, whether congenital or acquired, are very difficult to manage. Any significant surgical peri-esophageal dissection that is performed to allow for potential stretching of two ends of a defect interrupts the esophageal blood supply and leads to complications such as leak and stricture, even in the youngest, healthiest patients. The term “congenital” applied to these defects refers mainly to long-gap esophageal atresia (LGA). Causes of acquired long-segment esophageal disruption include recurrent leaks and fistulae after primary repair, refractory GERD, caustic ingestions, cancer, and strictures. 5,000–10,000 patients per year in the US require esophageal replacement. Gastric, colonic, and jejunal pull-up surgeries are fraught with high rates of both short and long term complications thus creating a space for a better option. Since the 1970’s many groups around the world have been unsuccessfully attempting esophageal replacement with tissue-engineered grafts in various animal models. But, recent advances in these models are now combining novel technologic advances in materials bioscience, stem-cell therapies, and transplantation and are showing increasing promise to human translational application. Transplantation has been heretofore unsuccessful, but given modern improvements in transplant microsurgery and immunosuppressive medications, pioneering trials in animal models are being undertaken now. These rapidly evolving medical innovations will be reviewed here.

Successful treatment of post chemotherapy esophageal cicatricial atresia in a pediatric patient with anaplastic large cell lymphoma through minimally invasive esophagectomy: a case report

Background

Anaplastic large cell lymphoma (ALCL) is a CD30-positive T-cell lymphoma, which is a rare type of non-Hodgkin lymphoma. ALCL rarely presents in the gastrointestinal tract, and the esophageal involvement in of ALCL is extremely rare.

Case presentation

An 11-year-old boy who complained of abdominal pain and cough was diagnosed with ALK-positive ALCL on the basis of systemic lymphadenopathy findings and immunohistochemistry results of pleural effusion. Although remission was observed after chemotherapy at 5 months after diagnosis, dysphagia persisted, and esophagoscopy revealed a severe stricture in the middle thoracic esophagus. At 9 months after diagnosis, allogeneic bone marrow transplantation was performed to ensure that complete remission was maintained; however, dysphagia and saliva retention did not improve. Approximately 10 months after diagnosis, esophagoscopy revealed a blind end in the middle thoracic esophagus, similar to that in congenital esophageal atresia. Subsequently, we performed minimally invasive subtotal esophagectomy under thoracoscopy and laparoscopy and gastric conduit reconstruction via the retrosternal route more than 2 years after allogeneic bone marrow transplantation. The final pathological diagnosis was esophageal atresia with esophagitis, with no malignancy. During postoperative evaluation, the patient required swallowing training for a few months, although no major complications were noted. Oral intake was possible, and complete remission was maintained at 14 month post-surgery.

Conclusions

Oncologists must consider the possibility of acquired esophageal cicatricial atresia as a complication during chemotherapy for ALCL. If esophageal obstruction or esophageal atresia occur and if remission is maintained, esophagectomy and esophageal reconstruction are useful treatment options for maintaining oral intake.

Single-incision laparoscopy-assisted gastric transposition combined with thoracoscopic esophagectomy for esophageal replacement

INTRODUCTION

We present a novel approach to single-incision laparoscopy-assisted gastric transposition combined with thoracoscopic esophagectomy in a child with long-segment corrosive esophageal stricture (CES).

MATERIALS AND SURGICAL TECHNIQUE

A 2.5-year-old boy with a history of caustic ingestion underwent periodic esophageal dilatations at 3-week intervals, four sessions of topical mitomycin C application, and a strict antacid/H₂ antagonist therapy for 8 months. The esophageal replacement was indicated because of persistent corrosive esophageal stricture. First, thoracoscopic native esophagus dissection was performed. After gastric mobilization with single-incision laparoscopy, esophagectomy and esophagogastric anastomosis were performed through the cervical incision. There was no complication, and the patient had gained weight by the end of the 12-month follow-up.

DISCUSSION

Single-incision laparoscopy-assisted gastric transposition combined with thoracoscopic esophagectomy is feasible, safe, and effective in patients with corrosive esophageal stricture.