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O. N. Dilek et al.
tomy can be performed with a laparoscopic or thoracoscopic approach. With minimally inva­sive procedures, pulmonary complications can be reduced and quality of life can be improved [16, 34]. Vagal-sparing esophagectomy tech- nique is also recommended to prevent dump­ing syndrome [35]. In this technique, right and left vagus nerves are isolated, highly selective vagotomy is performed, and esophagus is dis­sected with a vein stripper. The vagal-sparing esophagectomy, described by Akiyama from Japan, has advantages such as reducing the risk of dumping, protecting gastric drainage and gas­tric secretion, and reducing the risk of infection. This technique is mostly recommended for cases that require esophagectomy for benign disease because standard lymph node dissection is not performed. However, this method is not recom­mended in patients with BE with lymph node involvement [35, 36]. The inversion esophagec­tomy described by Hoppo etal. (2011) may be an alternative option [36, 37]. Mortality of pro­phylactic esophagectomy in various series was reported to be 1.7–10% and morbidity as 45%, which are the biggest disadvantages [3, 16, 22,
38]. It is suggested that prophylactic esophagec-
tomy should be performed in experienced cen­ters where more than 20 esophagectomies are performed annually, thus it is stated that mor­tality will be less than 5% [39]. Prophylactic esophagectomy can also be performed with lap­aroscopic and robotic surgery [16, 36].
The depth of the lesion and the presence of lymph node involvement should be evaluated in patients undergoing prophylactic esophagec­tomy. In patients with BE, a candidate for pro­phylactic esophagectomy, a detailed examination should be administered in terms of IMC, invasion depth of the lesion, and lymph node involvement. Prophylactic esophagectomy to be performed in patients with lymph node involvement will be insufcient and thus early recurrence and metas­tasis may be seen. Different results were found in the follow-up of patients who underwent prophy­lactic esophagectomy. It has been reported that cases with endoscopically HGD without IMC presence (T1a) will not metastasize to lymph nodes, but local submucosal invasion (T1b) may
occur in 7% of the cases and accompanying lym­phatic invasion may occur in 20–50% of these cases [9, 17]. While the incidence of IMC was high in the 1990s, it is much lower nowadays [22, 38]. Endoscopic follow-up and EUS should be the rst step procedures for accurate diagno­sis. Abdominal computed tomography (CT) can reveal adjacent and distant lymph node involve­ment. Positron emission tomography (PET)/CT can provide more accurate results about status of lymph node involvement [40]. In the prophylac­tic esophagectomy series of Tseng etal. (2003) with 60 patients, occult cancer was detected in 13 (43%) out of 30 patients with HGD in the rst half of the study, and occult cancer was detected in 5 (16.7%) out of 30 patients who underwent surgery in the second half of the study. Some studies recommended performing prophylactic esophagectomy in selected appropriate cases and in experienced centers [13, 38]. Adenocarcinoma occurred in 16% of 75 cases as a result of the 7-year follow-up of patients in the prophylactic esophagectomy series of Schnell et al. (2001) [10]. Most of the cancer development occurred in the early postoperative period and in the rst year. Due to undetectable IMC cases, endoscopic fol­low-up in the early postoperative period (1year) of patients with prophylactic esophagectomy is recommended to perform more functional and aggressive.
As a result; today, complete eradication can be achieved in 87% to 96% of cases with endo­scopic methods. Although prophylactic esopha­gectomy was considered as the rst option in the treatment of patients with BE and HGD in the 1990s, its indications have gradually decreased in recent years [41]. Prophylactic esophagectomy may be recommended in treat­ment-resistant cases or when dysplastic changes cannot be eradicated despite anti-reux surger­ies, lifestyle changes and medical treatment, or LGD or HGD cases complicated with stenosis (6%), ulcer, and hemorrhage (1%) [3, 34, 35,
42]. Prophylactic esophagectomy should be
performed in high-volume centers with expe­rienced surgeons. Mucosal ablation protocols should be applied in patients who refuse surgi­cal intervention.
13 Prophylactic Surgical Procedures forEsophageal Pathologies
145
13.3 Esophageal Varices
Esophageal varices are one of the most lethal complications of portal hypertension (PH). PH is that the pressure gradient in the portal vein is more than 6mmHg due to pathological reasons. Varicose veins are seen in 7–8% of patients with compensated cirrhosis annually. Esophageal var­ices develop in 30% of compensated cases and 60% of decompensated cases [43, 44]. Every year, 10–11% of developing varicose veins turn into larger varicose structures (they contain red wale marks—similar to whip marks) and their bleeding potential is high. Bleeding of varicose veins is associated with the condition of the patient according to the Child-Pugh classica­tion, and the diameter of the varices and whether there is a red wale mark on the varices [43, 45]. Hepatic venous pressure gradient (HVPG) is found above 10mmHg in patients with PH and varicose veins. Although varicose veins have a mortality of 20% in 5-year follow-up, the mortal­ity rate increases to 80% with other comorbidi­ties. There are studies reporting that 15–50% of cases with rst-time hemorrhage due to varicose veins die [46]. The risk is higher in decompen­sated cases. The risk is much higher in patients with HVPG above 20mmHg or in patients with infection [45, 47, 48].
The rst approach in patients with compen­sated cirrhosis and varicose veins is prophy­laxis. For this purpose, the rst step is to use a nonselective beta-blocker. Periodic follow-up of these patients is performed endoscopically. Endoscopic band ligation or sclerotherapy is applied for growing varicose veins. Complete obliteration can be achieved by applying prophy­lactic ligation at 1–2-week intervals. However, excessive and recurrent ligations can cause dys­phagia, ulceration, hemorrhage, and strictures. The ligation process is not a therapeutic process, but a local treatment. If PH continues, ligation process does not prevent appearing new varices. The rst approach in bleeding varicose veins is medical and endoscopic. However, it fails in 20% of cases. In such cases, the mortality risk is very high, bridge therapy should be planned, and bal­loon tamponade should be applied. Hemorrhage
can be taken under control in 80% of cases via the balloon tamponade (Sengstaken-Blakemore tube) [49]. The mortality of the procedure is approximately 20% and it is the biggest disad­vantage that it cannot be applied for more than 24 h due to its serious morbidity. Denitive operation after 48–72 h should be planned in patients undergoing balloon [44]. Recently, local self- expandible metal stents have become more preferred in treatment-resistant cases because of easier application and less morbidity. Side-to- side anastomosis is performed with the help of a suit­able expandible wall stent with the transjugular intrahepatic portosystemic shunt (TIPS) method, which is a radiological interventional method. TIPS is considered an effective option in patients who cannot remain stable in the rst 5days with medical and endoscopic treatment. It is reported that hemostasis can be achieved in 90% of cases with TIPS.TIPS will also signicantly reduce the amount of ascites in the patient [4951].
Although obliteration of varicose veins with endoscopic methods decreases rebleeding, bleed­ing recurs in 60–70% of the cases within 2years after the index bleeding [43, 48]. Each patient should be evaluated with a multimodal approach within their own conditions. There is consen­sus that the rst therapeutic approach should be medical treatment and endoscopic intervention in recurrent bleeding [52]. In the 2007, Guideline of the American Association for the Study of Liver Diseases (AASLD) group recommended TIPS in patients who could not remain stable despite medical and endoscopic treatment [53]. It is reported that 59–77% of patients undergo­ing TIPS have stent stenosis or obstruction within 2 years [54, 55]. However, this rate decreased with the development of closed-cell stents [53,
56]. In the TIPS study conducted with 71 patients
of Chen etal. (2019), after 1–24months of fol­low- up, encephalopathy rate was found 12.1%, the recurrent bleeding rate was found 18.2% [53]. Additionally, it was reported that ve patients died, four patients developed stent dysfunction, and success rate was found 93% in the same study.
Surgical options should be considered in patients whose bleeding cannot be stopped
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O. N. Dilek et al.
despite medical, endoscopic, and radiological interventions. The signicance of surgery in the treatment of PH has decreased considerably in the last two decades. Shunt surgeries and devas­cularization operations are performed in limited number of centers and selected cases [44]. Today, shunt surgeries and devascularization surgeries are performed in selected cases for emergency, therapeutic, or prophylactic purposes in order to decrease the portal pressure or decompress the varicose veins. Surgery may be required in cases of TIPS failure or dysfunction (stenosis, obstruction). The risk of mortality (30–50%) due to hypovolemia, malnutrition, and coagulopa­thies in patients undergoing emergency surgery is very high. In elective operations, mortality risk decreases to 15–30%. Liver transplantation is preferred in treatment, as a result of advances in transplantation surgery and increased standards after the development of end-stage liver failure, in liver patients who are successfully followed up with aggressive medical and endoscopic methods.
In shunt surgeries, decompression of portal blood ow (hepatopetal) with full, partial, or selective shunts is aimed (See Chap. 9; Liver). Nonselective shunt surgeries such as end-to­side or side-to-side portocaval shunts, mesoca­val interposition, and central splenorenal shunt are effective in reducing portal blood pressure. In addition to preventing variceal bleeding, they provide a serious decrease in the formation of ascites. In addition to effectiveness in decreasing portal pressure, portosystemic shunts can also cause serious comorbidities. Metabolic problems such as hepatic encephalopathy and hepatic fail­ure at different levels may occur as a result of portocaval decompression. In selective surgeries such as distal splenorenal shunt, liver functions are relatively better and metabolic complications are less common [51, 57, 58]. In a systematic review comparing patients with recurrent bleed­ing and underwent shunt surgeries or TIPS or endoscopic treatment, bleeding was more effec­tively prevented and mortality and encepha­lopathy were seen less common in patients who underwent portosystemic shunts compared to patients underwent TIPS or endoscopic treatment [59, 60].
Various procedures were described for devas­cularization of the esophagus. Some procedures are complicated techniques such as surgical devascularization, ligation, and transection of the esophagus with devascularization. In emergent cases, transgastric esophageal transection with staples can achieve optimal control of bleeding. Devascularization and mobilization should cover an esophageal segment of at least 7cm from the gastroesophageal junction. This procedure can also be performed for prophylaxis. High selective vagotomy and devascularization of the stomach can be added to the procedure. Although various devascularization surgeries were described in the literature, devascularization of the esophagus, transection with stapler, and splenectomy pro­cedure (Sugiura procedure) have become popu­lar [23]. Lower risk of encephalopathy (<10%) observed after devascularization surgeries is an advantage of these procedures. Devascularization operations can also be preferred in cases with PH associated with portal vein thrombus.
In patients with varicose veins, emergent, elec­tive, or prophylactic approaches are performed to prevent morbidity and mortality. Today, endo­scopic methods can stop hemorrhage in most (>90%) cases. Nowadays, the primary preference in patients with end-stage liver failure is liver transplantation. In cases where bleeding cannot be stopped, in cases of dysfunctional TIPS, and in selected cases, urgent shunting or non-shunt interventions may be applied, while prophylactic in cases with high risk of bleeding or rebleeding.
Apart from the shunts, there are other options such as terminal esophagoproximal gastrectomies (TEPG), esophageal transec­tions (ET), and Sugiura procedure to prevent esophageal variceal bleeding. These procedures can be applied for the therapeutic purpose as well as for prophylactic purpose [61]. The prognosis of patients underwent these surger­ies was reported to be better compared to other patients [62]. Five-year survival was found to be 85.9% in patients with prophylactic TEPG and 81.6% in patients with ET [61]. Five-year survival of Child A patients was reported to be higher compared to Child B patients [63]. After 5years, varicose veins recurrence was lower in
13 Prophylactic Surgical Procedures forEsophageal Pathologies
147
the TEPG group (18.4% vs. 26.4%) and 10-year survival was signicantly lower in the TEPG group (59.3% vs. 70%) [61]. Although the recurrence of varicose veins in the TEPG group is lower during 10years of follow- up, the rea­son for lower survival is that reux esophagitis, bleeding, liver failure, and anastomosis ulcer development are two times higher [61].
13.4 Corrosive Esophagitis andStrictures
Corrosive substances are chemicals that can directly cause tissue damage upon contact. Some patients may be asymptomatic after corrosive substances ingestion (CSI). In some patients, increased saliva, loss of appetite, dysphagia, pain­ful swallowing, burn marks on mouth and pharynx, retrosternal burning, abdominal pain, hemateme­sis, fever, vomiting, leukocytosis, tachycardia, agitation, and dyspnea [64]. Visceral perforation should be considered in cases such as persistent fever, peritonitis, chest pain, and hypotension. In this case, emergency surgery should be considered [65, 66].
The gold standard in determining tissue dam­age is esophagogastroduodenoscopy (EGD) [67]. Some authors stated that EGD administration is unnecessary in those who are asymptomatic after CSI [68, 69]. Bonavina etal. (2015) showed that CT is a better option than EGD in patient candi­date for emergent surgery [70]. The superiority of EUS, a new imaging tool, to endoscopy has not been demonstrated [71].
Stricture can be seen in 32% to 75% of patients with a high degree of damage and applied long­term treatment [72]. Stricture formation is observed in 80% of patients within 8weeks [66]. For stricture evaluation, barium esophagography and endoscopy can be used. Barium esophagog­raphy shows the size and formation of the stric­ture. Endoscopy detects mucosal recovery and the location of the stricture.
Endoluminal dilatation is the rst step treat­ment method widely accepted in CSI-related stricture formation [67]. Today, many centers use balloon dilatation under radiographic control
[67, 72, 73]. Balloon dilators have a lower risk of perforation than conventional bougie dilatation methods [67, 74]. Dilatation procedure should be started in 4–6weeks after CSI [75]. The fre­quency of dilatation should be done rst in every 1–3weeks until oral intake is achieved. Then, as long as there are signs of stricture, the procedure should be repeated until swallowing is achieved [76, 77].
Adenocarcinoma or squamous cell carcinoma may develop in the esophagus after CSI-related stricture formation [65]. Endoscopic surveil­lance is recommended to start 15–20years after CSI [78]. Control is suggested every 1–3years thereafter [77, 79]. Studies have been conducted for the early diagnosis of esophageal squamous cell carcinoma in children with CSI-related esophageal stricture. For this purpose, esopha­geal microRNA expression proles have been examined. It has been noted that miR-374 and miR- 574 as potential biomarkers of early diag­nosis of cancer can be the basis for validation of miRNAs [80].
Gastric outlet obstruction mostly occurs after concentrated acid ingestion [81]. Balloon dila­tion or surgical intervention may be required in case of gastric outlet obstruction. In treatment­resistant strictures, gastric tube esophagoplasty, colonic interposition, jejunal interposition, colonic patch esophagoplasty, or gastric advance­ment ap surgery may be required with partial esophageal resection [65].
13.5 Achalasia
Achalasia is a primary motility disorder with inadequate relaxation of the lower esophageal sphincter (LES). The absence of peristalsis results in stasis of ingested foods. These foods then lead to esophageal symptoms that cause dysphagia, regurgitation, chest pain, or weight loss [82].
Achalasia should be considered when other pathologies are excluded with upper GIS endos­copy in the patient presenting with dysphagia and other esophageal symptoms. In the diag­nosis of achalasia, methods such as barium esophagography, real-time esophageal transit
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esophagography/scintigraphy, conventional esophagus manometry, high-resolution esopha­gus manometry, and upper endoscopy are used.
Achalasia treatments are performed to decrease LES pressure. In medical treatment, nitrates, calcium canal blockers, and phospho­diesterase inhibitors can be used. Endoscopic injection of agents such as botulinum toxin, inter­mittent dilatation, or temporary stenting can be done. Another treatment is carried out by divid­ing the LES muscle (Myotomy) [83]. Myotomy
even after only iron supplementation in most of the cases. Endoscopic dilatation of the esopha­geal webs may be required in patients resistant to iron treatment [93]. Differentiation of PVS from other more common causes of dysphagia includ­ing malignancy, benign strictures, and corrosive esophageal burns is essential. PVS is associated with upper esophageal squamous cell carcinoma, thus endoscopic follow-up is required [95]. Esophagectomy should be considered just in case
of development of a malignant tumor. can be performed by endoscopic (peroral endo­scopic myotomy-POEM) or surgical intervention (Heller myotomy) [84, 85]. Heller myotomy can
13.6.2 Tylosis
be applied by the laparoscopic or conventional method. In the laparoscopic method, an approach from thorax or abdomen can be performed. The treatment steps are started with the methods that are the least invasive and reusable. Other indica­tions for esophageal resections are the presence of high-grade dysplasia or cancer.
Reux occurs in 11–25% of patients after myotomy and in 2% of patients after pneumatic dilatation [86]. Adenocarcinoma may develop due to treatment-related reux and Barrett’s esophagus [87, 88]. Esophagectomy may be considered in treatment-resistant and especially Chagas-induced achalasia cases [89, 90].
Tylosis is an autosomal dominant disease mani­festing with skin thickening in the extremities and is associated with a high risk of developing esophageal squamous cell carcinoma (OSCC). Members of a limited number of families mostly from Western countries were described in the lit­erature. Tylosis-associated OSCC mostly occurs in the sixth decade of life and in older ages. Annual esophagogastroscopy with quadratic biopsies of the esophageal lesions from onwards the early twenties is recommended for family members of affected patients. It is considered to require no interventions until the development of dysplastic changes in esophagogastroscopy [96,
97]. If a resectable tumor is detected in esoph-
13.6 Miscellaneous Conditions
agogastroscopy, surgical treatment should be considered. Otherwise, radiotherapy and chemo-
13.6.1 Plummer-Vinson Syndrome
therapy may be applied. An esophageal stent is a palliative option in patients with unresectable
Plummer-Vinson syndrome (PVS) also known as
or metastatic tumors to eliminate dysphagia [96]. Paterson-Brown-Kelly syndrome is characterized by a triad of iron-deciency anemia, dysphagia, and esophageal web [91]. Decreased incidence
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Stomach andDuodenum Resections forGenetic Predispositions
MustafaÖzsoy andFaikYaylak
14
14.1 Introduction
Gastric cancer being among the top ve most common cancer types is the third leading cause of cancer-related mortalities. Despite advances in diagnosis and treatment, the 5-year survival rate is still approximately 20% [1]. In line with the histopathological classication of gastric cancers, it is divided into two categories; the intestinal- type that is predominantly related to environmental factors and rich in glandu­lar, papillary, and tubular structures, and the diffuse-type that is predominantly related to genetic factors [2].
14.2 Overview ofGastric Cancer Carcinogenesis
About 10–20% of gastric carcinoma cases have a familial predisposition, while only a small pro­portion (about 1–3%) of them is associated with dened genetic tumor predisposition syndromes. Families that have BRCA1 and BRCA2 germline
M. Özsoy (*) Department of General Surgery, Aybu University, Ankara, Turkey e-mail: mustafa.ozsoy@aybu.edu.tr
F. Yaylak Department of General Surgery, Kutahya Saglık Bilimleri University, Kutahya, Turkey e-mail: faik.yaylak@ksbu.edu.tr
mutations, Lynch, Peutz-Jeghers, Li-Fraumeni syndrome, MUTYH-related adenomatous pol­yposis, familial adenomatous polyposis, and Cowden syndromes have a higher incidence of gastric cancer compared to the overall popula­tion [3, 4]. Gastric cancers are also one of the few malign neoplasms with an etiology on which infectious agents have a signicant role. The International Agency for Research on Cancer, a part of the World Health Organization, identi­ed Helicobacter pylori infection as the primary cause of gastric adenocarcinoma in 1994 [5]. An untreated pylori infection leads to a long-lasting chronic active gastritis, which is a risk factor for both intestinal and diffuse gastric adenocarci­nomas. However, gastric cancer occurs only in a small portion of patients infected with pylori (3/10,000). This situation could be due to the genetic predisposition, and possible differences in bacterial strains [6]. When gastric cancer was examined, Epstein–Barr virus (EBV) was found at a higher frequency (2–16%), especially in tumors of the proximal and middle part of the stomach. Many EBV-related genes includ­ing Eber1, Eber2, Ebna1, Lmp2a, Barf0–1 were found to be associated with gastric cancer [7].
Intestinal-type and diffuse-type gastric can­cers are the two distinct gastric adenocarcinomas with different morphological appearance, epide­miology, pathophysiology, and genetic prole. Unlike intestinal-type gastric cancers forming tightly linked tubular or glandular structures,
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2021 O. N. Dilek et al. (eds.), Prophylactic Surgery, https://doi.org/10.1007/978-3-030-66853-2_14
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