INCIDENCE OF RECURRENT LARYNGEAL NERVE PALSY IN CERVICAL ANASTOMOSIS AFTER ESOPHAGECTOMY FOR CARCINOMA ESOPHAGUS

Objective: To study the incidence of Recurrent Laryngeal Nerve Palsy (RLNP) in cervical anastomosis after esophagectomy for carcinoma of the esophagus. Study Design: Prospective observational study. Place and Duration of Study: Military Hospital’s Thoracic surgery departments, Combined Military Hospital Rawalpindi, Combined Military Hospital Lahore and Combined Military Hospital Multan, from Jan 2010 to Sep 2020. Methodology: Designated proformas were used to collect data. Histopathologically proven, operable cases of carcinoma esophagus with normal phonation were included, all of which underwent cervical anastomosis. All cases of benign pathologies and per-operative macroscopically advanced loco-regional disease were excluded. Recurrent laryngeal nerve (RLN) was identified in all cases and follow-up of 6 months for recovery period was executed. Results: 220 cases were included out of which 121 (55%) were males while 99 (45%) females. The age range was 14-81 years (mean is 38.7 ± 16.78). Out of 29 (13.6%) cases underwent minimally invasive esophagectomy (MIE) while thoracophreno laparotomy was performed in 100 (45.4%) cases, McKeown in 46 (20.9%) and Trans-hiatal esophagectomy (THE) in 45 (20.4%) patients. Recurrent Laryngeal Nerve Palsy was found in 19 patients (8.6%), tracheal injury in 3 (1.3%) and bronchial injury in 1 (0.4%) patient. Recurrent Laryngeal Nerve Palsy was transient in 14 cases and permanent damage persisted in 5 patients. Conclusion: Recurrent Laryngeal Nerve Palsy after esophagectomy is related to increased morbidity due to respiratory complications. With Sharp dissection technique, adequate surgical skill and equipment, the incidence of Recurrent Laryngeal Nerve Palsy can be decreased. In our study, it is less............

477 MINIMALLY INVASIVE MEDIASTINOSCOPIC IVOR-LEWIS ESOPHAGECTOMY WITH CERVICAL ANASTOMOSIS FOR ESOPHAGOGASTRIC JUNCTION ADENOCARCINOMA PATIENT UNDER INTRAOPERATIVE RECURRENT LARYNGEAL NERVE MONITORING

In early 2000s, cervical anastomosis after esophagectomy was associated with a higher rate of recurrent nerve trauma than thoracic anastomosis. Recently, new technologies have been developed that reduce surgical complications. Mediastinoscopic esophagectomy is reportedly less invasive and allows faster recovery than thoracoscopic esophagectomy. Intraoperative nerve monitoring (IONM) prevents recurrent laryngeal nerve (RNL) palsy. We present the case of minimally invasive mediastinoscopic Ivor-Lewis Esophagectomy (MMIE) under IONM performed on an elderly esophagogastric junction (EGJ) adenocarcinoma patient. Methods An 84-year old man was consulted for adenocarcinoma of GEJ without lymphnode metastasis. Despite his advanced age, he had no comorbidities. We planned to perform MMIE under IONM. The procedure started with a patient lithotomy, and three trocars plus small incision were made in the upper abdomen. Celiac lymphadenectomy was performed. Subsequently, a 35 mm incision was made in the left side of the neck and a monitor was attached to left vagus nerve. Three trocars were placed with single incision surgical devices and pneumomediastinum was noticed. Mediastinoscopic esophagectomy was performed. Gastric tube reconstruction via mediastinum with cervical anastomosis was performed. Results The operation was successful. Total operation time was 393 minutes, with an estimated blood loss of 5 mL. There were no intraoperative and postoperative complications, and no RLN palsy occurred. Conclusion MMIE with cervical anastomosis under IONM is safe and less invasive especially for the respiratory system as a thoracotomy is unnecessary. Video https://www.dropbox.com/s/9yqkzg3pm619pf6/%E7%B8%A6%E9%9A%94%E9%8F%A12%E5%88%8656%E7%A7%92.mp4?dl=0.

647 THE LEFT AND RIGHT RECURRENT LARYNGEAL NERVE LYMPH NODES POSSESS DIFFERENT ANATOMICAL CHARACTERISTICS AND RISK STRATIFICATIONS OF METASTASIS

The left and right recurrent laryngeal nerve(RLN) are asymmetrical, and the precise differences and metastasis risk stratifications based on preoperative CT scan between the left and right RLN lymph nodes have not yet been analyzed. In this study, we compared the anatomical characteristics and generated prediction models to predict the probability of left and right RLN lymph node metastasis using preoperative clinical data in patients undergoing thoracolaparoscopic esophagectomy with cervical anastomosis to guide clinical treatment. Methods We retrospectively reviewed the clinical data of 1660 consecutive patients with thoracic esophageal cancer who underwent esophagectomy with cervical anastomosis at the Department of Thoracic Surgery at our center between January 2015 and December 2020 and investigated the anatomical characteristics and risks of bilateral RLN lymph nodes according to preoperative CT scan and pathological examination findings. Results A total of 299 and 343 patients who underwent left(right) RLN lymph node dissection were included in the final analysis. By plotting ROC curves, we concluded that the cutoff values of the long and short axis to predict metastasis of the left (right) RLN lymph nodes were 10 (8 mm) and 7.5 (6.5 mm), respectively. The short axis rather than the long axis was significantly associated with left RLN lymph node metastasis. Correspondingly, the long axis was much more important than the short axis in regard to the right RLN lymph nodes. Conclusion There were different anatomical characteristics and precise metastasis risk stratifications between the left and right RLN lymph node metastases.

309 ASSOCIATION BETWEEN CERVICAL ANASTOMOSIS METHODS AND ANASTOMOSIS STRICTURE AFTER ESOPHAGECTOMY FOR CANCER

Esophagectomy with three-field lymph node dissection is the most important part of advanced esophageal cancer therapy, especially for squamous cell carcinoma (SCC) patients. After esophagectomy, cervical anastomosis with gastric tube is required. However, some patients suffer anastomotic stenosis and require endoscopic balloon dilations. In this study, we investigated the relationship between cervical anastomosis methods and anastomosis stricture after esophagectomy for cancer patients. Methods Patients with esophageal cancer undergoing radical esophagectomy with cervical anastomosis were identified from the prospectively maintained database at our institution. From 2013 to 2019, 28 patients received esophagectomy with cervical lymph node dissection in our institution. Association between anastomotic methods, linear stapler vs circular stapler, and other factors (patient characteristics, surgical complications including anastomotic stenosis, and length of postoperative stay) were analyzed. Results Their average age was 63.3 years. Males and SCC cases predominated. Thirteen patients (46%) received cervical anastomosis with the circular stapler (Group C), and 11 patients (39%) received treatment with the linear stapler (Group L). None of the following variables were significant different between the two methods: preoperative chemotherapy (53.8% in group C vs. 45.5% in group L; p = 0.58), length of hospital stay (25.8 vs. 20.7 days; p = 0.15), pulmonary complications (16.7% vs. 0.0%; p = 0.36), and anastomotic leakage (33.3% vs. 9.1%; p = 0.24). However, the rate of anastomotic stenosis without malignancies was significantly higher in group C patients (66.7% vs. 0%, p < 0.01). Conclusion Cervical anastomosis with the linear stapler may be safer and associated with a lower stenosis rate than with the circular stapler. In future, cervical anastomosis with linear stapler after mediastinoscopic esophagectomy would be better for not only esophageal SCC patients but also esophagogastric junction adenocarcinoma patients with pulmonary complications.

722 SAFE (SUPERCHARGED CERVICAL ANASTOMOSIS FOR ESOPHAGECTOMY AND GASTRIC PULL-UP) PROCEDURE: LONG TERM RESULTS FROM 61 PATIENTS

Esophagectomy still represents a challenge surgical procedure. Anastomotic leakage is the most feared complication and is likely related to diminished anastomotic perfusion. ‘Supercharged’ microvascular anastomosis has been performed in select patients to supplement the blood supply to the graft and anastomosis, after esophagectomy. This study aimed to evaluate results after performing the supercharged cervical anastomosis for esophagectomy procedure. Methods This prospective cohort study evaluated patients who underwent esophagectomy with gastric reconstruction and cervical anastomosis for locally advanced esophageal carcinoma. Patients were selected in which cervical anastomosis using the supercharged cervical anastomosis for esophagectomy procedure was performed. The anastomotic perfusion areas were evaluated using indocyanine and SPY before and after supercharged cervical anastomosis for esophagectomy. Post esophagectomy complications were also recorded. Results The study enrolled 61 patients, which included 47 (77.0%) men, with a mean age of 67.3 years. Median additional surgical time was 112 min (IQ 90–180), Leakage occurred in 1.6% of the patients (microanastomosis thrombosis), whereas the corresponding anastomotic stricture rates were 3.2% (mean follow-up was 25 mounths). Perfusion analyses showed a 28% improvement in the anastomotic area after venous anastomosis and a 37% improvement after arterial and venous anastomosis. Conclusion The supercharged cervical anastomosis for esophagectomy procedure may be related to low occurrence of anastomotic leakage and improve perfusion in the anastomotic area via vein and arterial microanastomoses.

744 THE USE OF IMMUNOFLUORESCENCE TO EVALUATE THE PERFUSION OF THE GASTRIC PLASTY DURING OESOPHAGECTOMY.

Anastomotic leakage in oesophageal cancer surgery is one of the most serious complications and occurs mainly at the cervical level between 10–30% according to series. The use of immunofluorescence could help to select a better vascularized area in which to perform the anastomosis more safely. We present the initial experience (between July and December 2020) of our group. Methods Prospective and descriptive study of patients with oesophageal neoplasia who underwent a 3 stage oesophagectomy with cervical anastomosis using immunofluorescence with indocyanine green (dose: 7,5 mg) for quick evaluation of vascularization in the theoretical anastomosis zone in gastric plasty. Intravenous injection of the indocyanine green dilution was performed intraoperatively in a peripheral line, once the plasty was positioned in place to perform the anastomosis. The route of ascent was transmediastinal in all cases. 9 patients with a mean age of 61 ± 7.6 years were included in the study. Results The mean heart rate was 83 ± 16 bpm, the mean systolic blood pressure was 111 ± 17 mmHg. The time and mean speed it took for the fluorescence to reach the marked area to perform the anastomosis was 30 ± 28 seconds and 1.83 cm/sec; and at the apex of the plasty it was 93 ± 79 seconds and 0.75 cm/sec. In all patients in whom the anastomosis was performed in the area where ICG arrived between 30 and 90 seconds, there was no leakage. In two patients, due to anatomical needs, the anastomosis was performed in areas where ICG took more than 100 seconds and in the postoperative period leaked. Conclusion Immunofluorescence is a technique that allows an immediate visual image to evaluate the vascularization of the gastric plasty during an esophagectomy. It allows characterizing the adequate vascularization of the future anastomotic area, being able to help decide the best place to carry out the anastomosis. Studies with a larger number of cases are needed to be able to define the range in which to establish the anastomosis or change the surgical strategy.

Simultaneous Vascular Reconstruction and Cervical Anastomosis in McKeown Esophagectomy

A stomach was considered ineligible to be an ideal conduit conventionally if its right gastroepiploic artery (RGEA) were injured. However, both sufficient blood flow and good venous return are crucial to the success of reconstruction. And there lacks robust evidence regarding the surgical techniques of reconstructing RGEA and right gastroepiploic vein (RGEV) and performing cervical anastomosis with gastric conduit simultaneously. Herein, we summarized the key surgical techniques for simultaneous vascular reconstruction and gastric conduit anastomosis in McKeown esophagectomy.