How I do it. Pancreatojejunostomy: surgical tips to mitigate the severity of postoperative pancreatic fistulas after open or minimally invasive pancreatoduodenectomy.

Pancreatoduodenectomy is the most appropriate technique for the treatment of periampullary tumors. In the past, this procedure was associated with high mortality and morbidity, but with improvements in patient selection, anesthesia, and surgical technique, mortality has decreased to less than 5%. However, morbidity remains increased due to various complications such as delayed gastric emptying, bleeding, abdominal collections, and abscesses, most of which are related to the pancreatojejunostomy leak. Clinically relevant postoperative pancreatic fistula is the most dangerous and is related to other complications including mortality. The incidence of postoperative pancreatic fistula ranges from 5-30%. Various techniques have been developed to reduce the severity of pancreatic fistulas, from the use of an isolated jejunal loop for pancreatojejunostomy to binding and invagination anastomoses. Even total pancreatectomy has been considered to avoid pancreatic fistula, but the late effects of this procedure are unacceptable, especially in relatively young patients. Recent studies on the main techniques of pancreatojejunostomy concluded that duct-to-mucosa anastomosis is advisable, but no technique eliminates the risk of pancreatic fistula. The purpose of this study is to highlight technical details and tips that may reduce the severity of pancreatic fistula after pancreatojejunostomy during open or minimally invasive pancreatoduodenectomy.

Liver Histology Predicts Liver Regeneration and Outcome in ALPPS: Novel Findings From A Multicenter Study.

BACKGROUND AND AIMS: Alterations in liver histology influence the liver's capacity to regenerate, but the relevance of each of the different changes in rapid liver growth induction is unknown. This study aimed to analyze the influence of the degree of histological alterations during the first and second stages on the ability of the liver to regenerate. METHODS: This cohort study included data obtained from the International ALPPS Registry between November 2011 and October 2020. Only patients with colorectal liver metastases were included in the study. We developed a histological risk score based on histological changes (stages 1 and 2) and a tumor pathology score based on the histological factors associated with poor tumor prognosis. RESULTS: In total, 395 patients were included. The time to reach stage 2 was shorter in patients with a low histological risk stage 1 (13 vs 17 days, P ˂0.01), low histological risk stage 2 (13 vs 15 days, P <0.01), and low pathological tumor risk (13 vs 15 days, P <0.01). Regarding interval stage, there was a higher inverse correlation in high histological risk stage 1 group compared to low histological risk 1 group in relation with future liver remnant body weight ( r =-0.1 and r =-0.08, respectively), and future liver remnant ( r =-0.15 and r =-0.06, respectively). CONCLUSIONS: ALPPS is associated with increased histological alterations in the liver parenchyma. It seems that the more histological alterations present and the higher the number of poor prognostic factors in the tumor histology, the longer the time to reach the second stage.

Multicenter Study on the Performance of Imaging Tests Compared to Endosonography-Guided Fine-Needle Aspiration in the Diagnosis of Solid Pseudopapillary Neoplasms of the Pancreas.

Introduction: Imaging diagnosis of pancreatic solid-pseudopapillary neoplasms (SPNs) is difficult. Preoperative diagnosis by endosonography-guided fine-needle aspiration (EUS-FNA) is possible and has been reported in the literature in pancreatic tumors. However, its usefulness is still controversial. The aim of this study was to determine the accuracy of the EUS-FNA in the diagnosis of patients with SPN and describe the findings in computerized tomography (CT), magnetic resonance cholangiopancreatography imaging (MRI/MRCP), and EUS therefore comparing the imaging methods alone to the findings of microhistology (McH) obtained by EUS-FNA. Materials and Methods: We retrospectively reviewed the medical records of patients undergoing EUS-FNA with suspected SPN in imaging studies in 5 Brazilian high-volume hospitals (two university hospitals and three private hospitals). The demographic data; findings in CT, MRI/MRCP, and EUS; and McH results obtained by EUS-FNA were noted prospectively. The final diagnosis was obtained after the anatomopathological examination of the surgical specimen in all patients (gold standard), and we compared the results of CT, MRI/MRCP, EUS, and the McH with the gold standard. Results: Fifty-four patients were included in the study, of which 49 (90.7%) were women with an average age of 33.4 (range 11-78) years. The most common symptom presented was abdominal pain, present in 35.2% patients. SPN was detected incidentally in 32 (59%) patients. The average size of the tumors was 3.8 cm (SD: 2.26). The most common finding at EUS was a solid, solid/cystic, and cystic lesion in 52.9%, 41.1%, and 7.8% patients, respectively. The final diagnosis was 51 patients with SPN and 3 with nonfunctioning pancreatic neuroendocrine tumors (NF-NET). The correct diagnosis was made by CT, MRI/MRCP, EUS isolated, and EUS-FNA in 21.9%, 28.88%, 64.71%, and 88.24%, respectively. EUS-FNA associated with CT and MRI increased diagnostic performance from 22.72% to 94.11% and from 29.16% to 94.11%, respectively. Conclusions: SPN are rare, incidentally identified in most cases, and affect young women. Differential diagnosis between SPN, NF-NET, and other types of tumors with imaging tests can be difficult. EUS-FNA increases preoperative diagnosis in case of diagnostic doubt and should be used whenever necessary to rule out NF-NET or other type of solid/cystic nodular lesion of the pancreas.

Introdução: O diagnóstico por imagem da neoplasia pseudopapilar sólida do pâncreas (NPS) é difícil. O diagnóstico pré-operatório obtido pela endosonografia com punção aspirativa por agulha fina (USE-PAF) é possível e tem sido relatado na literatura em tumores do pâncreas. No entanto, sua indicação é controversa e merece discussão. O objetivo do estudo foi determinar a acurácia da USE-PAF no diagnóstico de pacientes com NPS, descrever os achados da tomografia computadorizada (TC), colangiopancreatografia por ressonância magnética (RM/ CPRM) e USE, comparando os métodos de imagem isolados aos achados da microhistologia (McH) obtida pela USE-PAF. Material e Métodos: Revisamos retrospectivamente os prontuários de pacientes submetidos à USE-PAF com suspeita de NPS em exames de imagem de 5 hospitais brasileiros de alto volume (dois universitários e três privados). Foram anotados prospectivamente os dados demográficos, os achados da TC, RM/CPRM e USE e o resultado da McH obtida pela USE-PAF. O diagnóstico final foi obtido após o anatomopatológico da peça operatória em todos os pacientes (padrão-ouro). Comparamos os resultados da TC, RM/CPRM, EUS isoladas e da McH obtida pela USE-PAF com o padrão-ouro. Resultados: Cinquenta e quatro pacientes foram incluídos no estudo, 49 (90.7%) eram mulheres com média de idade de 33.4 (11­78) anos. O sintoma mais frequente foi dor abdominal, presente em 35.2%. A NPS foi detectada acidentalmente em 32 (59%) pacientes. O tamanho médio da lesão foi de 3.8 cm (SD: 2.26). O achado mais comum à USE foi lesão sólida, sólida/ cística e cística em 52.9%, 41.1% e 7.8%, respectivamente. O diagnóstico final foi NPS (51) e tumor neuroendócrino pancreático não funcionante [NF-NET] (3). O diagnóstico correto feito pela TC, RM, USE e USE-PAF foi feito em 21.9%, 28.9%, 64.7% e 88.2%, respectivamente. A USEPAF associada a TC e a RM aumentou o desempenho diagnóstico de 21.9% para 94.1% e de 28.8% para 94.1%, respectivamente. Conclusões: NPS são raras, identificadas de forma acidental na maioria dos casos e afetam principalmente mulheres jovens. O diagnóstico diferencial entre NPS, NF-NET e outros tipos de lesões com exames de imagem isolados pode ser difícil. A USE-PAF aumenta a chance do diagnóstico pré-operatório em caso de dúvida diagnóstica e deve ser usado sempre que necessário para descartar NF-NET ou outro tipo de lesão nodular sólida ou sólido/cística do pâncreas.

Does fasting protect liver from ischemia and reperfusion injury?

PURPOSE: To evaluate local and systemic effects of 24-hour fasting in liver ischemia and reperfusion injury. METHODS: Twenty-one adult male Wistar rats (330-390 g) were submitted to 60 minutes of hepatic ischemia followed by 24 hours of reperfusion. Before the day of the experiment, the animals fasted, but free access to water was allowed. Two groups were constituted: Control: non-fasted, that is, feeding ad libitum before surgical procedure; Fasting: rats underwent previous fasting of 24 hours. Hepatic ischemia was performed using vascular clamp in hepatic pedicle. At 24 hours after liver reperfusion, blood and tissue samples were collected. To analysis, liver lobes submitted to ischemia was identified as ischemic liver and paracaval non-ischemic lobes as non-ischemic liver. We evaluated: malondialdehyde levels, hepatocellular function (alanine aminotransferase, aspartate aminotransferase activities, and both ratio), cytokines (interleukins-6, -10, and tumor necrosis factor-alpha), hepatic ischemia and reperfusion injury (histology). RESULTS: Malondialdehyde measured in non-ischemic and ischemic liver samples, hepatocellular function and cytokines were comparable between groups. Histological findings were distinct in three regions evaluated. Microvesicular steatosis was comparable between 24-hour fasting and non-fasted control groups in periportal region of hepatic lobe. In contrast, steatosis was more pronounced in zones 2 and 3 of ischemic liver samples of fasting compared to control groups. CONCLUSIONS: These data indicates that fasting does not protect, but it can be also detrimental to liver submitted to ischemia/reperfusion damage. At that time, using long fasting before liver surgery in the real world may be contraindicated.

Bovine Pericardial Graft for Portomesenteric Reconstruction During Robotic Pancreatoduodenectomy.

BACKGROUND: Minimally invasive pancreatoduodenectomy (PD) is one of the most complex procedures in oncologic surgery. We present a video of robotic portomesenteric reconstruction with bovine pericardial graft during PD. METHODS: A 52-year-old woman was referred with a mass in the head of the pancreas. The tumor was in contact with the portomesenteric axis. The multidisciplinary team decided to perform an upfront resection. The surgery was performed as a pylorus-preserving pancreaticoduodenectomy with lymphadenectomy. The superior mesenteric artery first approach was used to expose the head of the pancreas, so that the entire surgical specimen was attached only through the tumor invasion of the portomesenteric axis. After resection of the invaded portomesenteric axis, its large extension precluded primary reconstruction, so a bovine pericardial graft was used for venous reconstruction. After completion of the venous anastomosis, reconstruction of the digestive tract was performed as usual. RESULTS: Surgical time was 430 min; clamp time was 55 min; and portomesenteric reconstruction took 41 min. Estimated blood loss was 320 mL without transfusion. Pathology confirmed T3N1 ductal adenocarcinoma with free margins. No pancreatic or biliary fistula was observed, and she was discharged on postoperative day 8. A postoperative examination confirmed the patency of the graft. The patient is doing well 6 months after surgery and has no signs of the disease. CONCLUSIONS: A bovine pericardial graft is useful for reconstruction and readily available, eliminating the need to harvest an autologous vein or use synthetic grafts. This procedure can be safely performed with the robotic platform.

Endoscopic Ultrasound-Guided Tissue Acquisition Versus Fine Needle Aspiration for Diagnosis of Pancreatic Ductal Adenocarcinoma.

OBJECTIVES: Compare the 22G needle versus EchoTip ProCore® 20 (Cook Medical, Bloomington, IN, USA) on their handling, specimen suitability, amount of tissue obtained, diagnostic performance, the possibility of immunohistochemistry, and rate of adverse events. MATERIALS AND METHODS: This is a retrospective, comparative study of consecutively examined patients with pancreatic masses who underwent endosonography-guided fine needle aspiration (FNA) via the 22G needle, and endosonography-guided tissue acquisition (TA) via ProCore 20 (PC20). The operator evaluated needle insertion and subjectively classified the specimen. The pathologist measured the samples, classified the amount of tissue, and determined the influence of bleeding on the interpretation. RESULTS: A total of 129 patients participated in the study, out of whom 52 underwent endosonography-guided FNA with 22G and 77 underwent endosonography-guided TA with a PC20 needle. Malignant lesions were found in 106, and 23 had benign lesions. The duodenal route was used in 62% of patients. The 22G needle was easier to introduce (p=0.0495). However, PC20 obtained a larger amount (p<0.01) with fewer punctures (p<0.001). The PC20 also yielded a larger average microcore diameter (p=0.0032). Microhistology was adequate for 22G and PC20 in 22 (42.2%) and 50 (78.1%) specimens, respectively (p<0.001). Bleeding was not significantly different (p>0.999). Immunohistochemistry was possible in 36 (69.2%) and 40 (51.9%) specimens obtained by 22G and PC20, respectively (p=0.075). The sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of 22G were 93.5%, 100%, 100%, 66.7%, and 94.2%, respectively; and for PC20, it was 95%, 100%, 100%, 85%, and 96.1%, respectively. Mild bleeding was the most common early adverse event, occurring in 2/52 (3.8%) 22G and 4/77 (5.2%) PC20 cases (p>0.05). CONCLUSIONS: The PC20 required fewer punctures and reduced the need for immunohistochemistry as it yielded better and larger microcores. Its ease of insertion into the target lesion makes it a good option to obtain satisfactory microcore specimens in difficult positions, such as the transduodenal route.

Bioabsorbable Polymeric Stent for the Treatment of Coarctation of the Aorta (CoA) in Children: A Methodology to Evaluate the Design and Mechanical Properties of PLA Polymer.

This study presents a methodology that combines experimental tests and the finite element method, which is able to analyse the influence of the geometry on the mechanical behaviour of stents made of bioabsorbable polymer PLA (PolyLactic Acid) during their expansion in the treatment of coarctation of the aorta (CoA). Tensile tests with standardized specimen samples were conducted to determine the properties of a 3D-printed PLA. A finite element model of a new stent prototype was generated from CAD files. A rigid cylinder simulating the expansion balloon was also created to simulate the stent opening performance. A tensile test with 3D-printed customized stent specimens was performed to validate the FE stent model. Stent performance was evaluated in terms of elastic return, recoil, and stress levels. The 3D-printed PLA presented an elastic modulus of 1.5 GPa and a yield strength of 30.6 MPa, lower than non-3D-printed PLA. It can also be inferred that crimping had little effect on stent circular recoil performance, as the difference between the two scenarios was on average 1.81%. For an expansion of diameters ranging from 12 mm to 15 mm, as the maximum opening diameter increases, the recoil levels decrease, ranging from 10 to 16.75% within the reported range. These results point out the importance of testing the 3D-printed PLA under the conditions of using it to access its material properties; the results also indicate that the crimping process could be disregarded in simulations to obtain fast results with lower computational cost and that new proposed stent geometry made of PLA might be suitable for use in CoA treatments-the approach that has not been applied before. The next steps will be to simulate the opening of an aorta vessel using this geometry.

Bioabsorbable polymeric Stent for the treatment of Coarctation of the Aorta (CoA) in children: A methodology to evaluate the design and mechanical properties of PLA polymer

This study presents a methodology that combines experimental tests and the finite element method, which is able to analyse the influence of the geometry on the mechanical behaviour of stents made of bioabsorbable polymer PLA (PolyLactic Acid) during their expansion in the treatment of coarctation of the aorta (CoA). Tensile tests with standardized specimen samples were conducted to determine the properties of a 3D-printed PLA. A finite element model of a new stent prototype was generated from CAD files. A rigid cylinder simulating the expansion balloon was also created to simulate the stent opening performance. A tensile test with 3D-printed customized stent specimens was performed to validate the FE stent model. Stent performance was evaluated in terms of elastic return, recoil, and stress levels. The 3D-printed PLA presented an elastic modulus of 1.5 GPa and a yield strength of 30.6 MPa, lower than non-3D-printed PLA. It can also be inferred that crimping had little effect on stent circular recoil performance, as the difference between the two scenarios was on average 1.81%. For an expansion of diameters ranging from 12 mm to 15 mm, as the maximum opening diameter increases, the recoil levels decrease, ranging from 10 to 16.75% within the reported range. These results point out the importance of testing the 3D-printed PLA under the conditions of using it to access its material properties; the results also indicate that the crimping process could be disregarded in simulations to obtain fast results with lower computational cost and that new proposed stent geometry made of PLA might be suitable for use in CoA treatments-the approach that has not been applied before. The next steps will be to simulate the opening of an aorta vessel using this geometry.

Molecular Basis of Hyperammonemic Encephalopathy in Fibrolamellar Hepatocellular Carcinoma.

Hyperammonemic encephalopathy is a potentially fatal condition associated with fibrolamellar hepatocellular carcinoma. The mechanism involved in hyperammonemia in patients with fibrolamellar carcinoma was unclear until a possible physiopathological pathway was recently proposed. An ornithine transcarboxylase dysfunction was suggested as a result of increased ornithine decarboxylase activity induced by c-Myc overexpression. This c-Myc overexpression resulted from Aurora kinase A overexpression derived from the activity of a chimeric kinase that is the final transcript of a deletion in chromosome 19, common to all fibrolamellar carcinomas. We performed the analysis of the expression of all enzymes involved and tested for the mutation in chromosome 19 in fresh frozen samples of fibrolamellar hepatocellular carcinoma, non-tumor liver, and hepatic adenomatosis. The specific DNAJB-PRKACA fusion protein that results from the recurrent mutation on chromosome 19 common to all fibrolamellar carcinoma was detected only in the fibrolamellar carcinoma sample. Fibrolamellar carcinoma and adenomyomatosis samples presented increased expression of Aurora kinase A, c-MYC, and ornithine decarboxylase when compared to normal liver, while ornithine transcarbamylase was decreased. The proposed physiopathological pathway is correct and that overexpression of c-Myc may also be responsible for hyperammonemia in patients with other types of rapidly growing hepatomas. This gives further evidence to apply new and adequate treatment to this severe complication.

A new technique of duodenojejunostomy may reduce the rate of delayed gastric emptying after pylorus-preserving pancreatoduodenectomy: The growth factor technique (with video).

BACKGROUND: Despite various technical modifications, delayed gastric emptying (DGE) is one of the most common complications after pancreatoduodenectomy. DGE results in longer hospital stay, higher cost, lower quality of life, and delay of adjuvant therapy. We have developed a modified duodenojejunostomy technique to reduce the incidence of DGE. Here we evaluate our 4-year experience with this technique. METHODS: This study evaluated consecutive patients who underwent pylorus-preserving pancreatoduodenectomy using the growth factor technique. It consists of performing a posterior seromuscular running suture with a zigzag stitch that stretches the jejunum and allows future growth of the anastomosis. This results in a longer jejunal opening. The angles at the edge of the duodenum are cut to accommodate the duodenal opening to the longer jejunum (the growth factor). The anterior seromuscular layer is then performed with interrupted sutures to accommodate the larger anastomosis. These patients were compared with a cohort of patients (n = 103) before the introduction of this new technique using propensity score matching. RESULTS: 134 patients underwent pylorus-preserving pancreatoduodenectomy. Delayed gastric emptying occurred in only three patients (2.2%), one grade B and two grade C. Compared with the 103 patients in the control group with standard technique, the incidence of DGE was significantly higher (11.6%; P = 0.00318). The median hospital stay was also statistically longer in the control group (P = 0.048704). A similar trend was observed in the matched cohort; the proportion of patients who developed DGE was significantly (P = 0.005) lower in the growth factor technique group (2.1% vs. 12.9%). Hospital stay was significantly longer in the standard group (P = 0.008), and patients operated on with the standard technique resumed feeding later than those with the growth factor technique. CONCLUSIONS: This study demonstrated that the new technique of duodenojejunostomy can reduce the incidence and severity of DGE and allow earlier hospital discharge. Comparative studies are still needed to confirm these preliminary results.

Robotic Hepatic Bisegmentectomy (s4b + s5) and Hilar Lymphadenectomy for Incidental Gallbladder Cancer Using Glissonian Approach.

BACKGROUND: Gallbladder carcinoma is a rare cancer with a poor prognosis and the most common biliary tract malignancy. This video shows robotic treatment of a patient with incidental gallbladder cancer diagnosed after laparoscopic cholecystectomy. The operation consisted of a robotic bisegmentectomy (liver segments 4b and 5) using a Glissonian approach and a hilar lymphadenectomy. METHODS: A 73-year-old woman with no relevant history underwent a laparoscopic cholecystectomy at another hospital facility. The pathology revealed a gallbladder carcinoma. The patient was then referred for further treatment. Pathologic revision confirmed T2a carcinoma and staging was negative for distant metastases. The multidisciplinary team decided on a radical resection that will consist of a hilar lymphadenectomy and a frozen section of the cystic stump along the resection of segments 4b and 5. A robotic approach was proposed, and consent was obtained. RESULTS: The operation time was 300 min and was performed 21 days after the cholecystectomy. Estimated blood loss was 120 mL with no transfusions required during or after the procedure. The postoperative recovery was uneventful, and the patient was discharged on the fourth postoperative day. The final pathology showed no residual disease in the liver specimen and no metastases among 16 removed lymph nodes. CONCLUSIONS: The robotic approach is safe and feasible for radical treatment after incidentally discovered gallbladder cancer. The Glissonian approach is useful for anatomic resection of liver segments 4b and 5. This video can help oncologic surgeons to perform this challenging procedure.

Robotic Left Trisectionectomy with Glissonian Approach (with Video).

BACKGROUND: Left hepatic trisectionectomy consists of the removal of liver segments 2, 3, 4, 5, and 8. This difficult surgical procedure may be required when the left liver and right anterior sector (segments 5 and 8) are involved. We present a video of a robotic anatomic left trisectionectomy with Glissonian approach to the left and right anterior sector pedicles. METHODS: A 77-year-old man presented at a routine ultrasound with a large liver mass. Magnetic resonance imaging showed a bulky hepatocellular carcinoma occupying liver segments 2, 3, 4, 5, and 8, with a portal tumor thrombus in the right anterior sector. The patient had multiple comorbidities, including obesity, diabetes, hypertension, and coronariopathy. The multidisciplinary team decided to use immunotherapy with atezolizumab and bevacizumab. After 12 cycles, the patient showed an objective response, and left trisectionectomy was indicated. A robotic approach was proposed and consent was obtained. The Glissonian approach was used for anatomic control of the left and right anterior sector pedicles. RESULTS: The operative time was 390 min with an estimated blood loss of 410 ml, and no transfusion was required during or after the procedure. Recovery was uneventful and the patient was discharged on postoperative day 8. No bile leak was observed, and the drain was removed on postoperative day 8. CONCLUSIONS: Robotic left trisectionectomy is safe and feasible. The Glissonian approach is useful for anatomic left liver trisectionectomy. This video can help gastrointestinal surgeons perform this complex procedure in a minimally invasive manner.

An International Expert Delphi Consensus on Defining Textbook Outcome in Liver Surgery (TOLS).

OBJECTIVE: To reach global expert consensus on the definition of TOLS in minimally invasive and open liver resection among renowned international expert liver surgeons using a modified Delphi method. BACKGROUND: Textbook outcome is a novel composite measure combining the most desirable postoperative outcomes into one single measure and representing the ideal postoperative course. Despite a recently developed international definition of Textbook Outcome in Liver Surgery (TOLS), a standardized and expert consensus-based definition is lacking. METHODS: This international, consensus-based, qualitative study used a Delphi process to achieve consensus on the definition of TOLS. The survey comprised 6 surgical domains with a total of 26 questions on individual surgical outcome variables. The process included 4 rounds of online questionnaires. Consensus was achieved when a threshold of at least 80% agreement was reached. The results from the Delphi rounds were used to establish an international definition of TOLS. RESULTS: In total, 44 expert liver surgeons from 22 countries and all 3 major international hepato-pancreato-biliary associations completed round 1. Forty-two (96%), 41 (98%), and 41 (98%) of the experts participated in round 2, 3, and 4, respectively. The TOLS definition derived from the consensus process included the absence of intraoperative grade ≥2 incidents, postoperative bile leakage grade B/C, postoperative liver failure grade B/C, 90-day major postoperative complications, 90-day readmission due to surgery-related major complications, 90-day/in-hospital mortality, and the presence of R0 resection margin. CONCLUSIONS: This is the first study providing an international expert consensus-based definition of TOLS for minimally invasive and open liver resections by the use of a formal Delphi consensus approach. TOLS may be useful in assessing patient-level hospital performance and carrying out international comparisons between centers with different clinical practices to further improve patient outcomes.

Does fasting protect liver from ischemia and reperfusion injury?

Purpose: To evaluate local and systemic effects of 24-hour fasting in liver ischemia and reperfusion injury. Methods: Twenty-one adult male Wistar rats (330-390 g) were submitted to 60 minutes of hepatic ischemia followed by 24 hours of reperfusion. Before the day of the experiment, the animals fasted, but free access to water was allowed. Two groups were constituted: Control: non-fasted, that is, feeding ad libitum before surgical procedure; Fasting: rats underwent previous fasting of 24 hours. Hepatic ischemia was performed using vascular clamp in hepatic pedicle. At 24 hours after liver reperfusion, blood and tissue samples were collected. To analysis, liver lobes submitted to ischemia was identified as ischemic liver and paracaval non-ischemic lobes as non-ischemic liver. We evaluated: malondialdehyde levels, hepatocellular function (alanine aminotransferase, aspartate aminotransferase activities, and both ratio), cytokines (interleukins-6, -10, and tumor necrosis factor-alpha), hepatic ischemia and reperfusion injury (histology). Results: Malondialdehyde measured in non-ischemic and ischemic liver samples, hepatocellular function and cytokines were comparable between groups. Histological findings were distinct in three regions evaluated. Microvesicular steatosis was comparable between 24-hour fasting and non-fasted control groups in periportal region of hepatic lobe. In contrast, steatosis was more pronounced in zones 2 and 3 of ischemic liver samples of fasting compared to control groups. Conclusions: These data indicates that fasting does not protect, but it can be also detrimental to liver submitted to ischemia/reperfusion damage. At that time, using long fasting before liver surgery in the real world may be contraindicated.