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Badawy A, Samer B, Sabra T. Analysis of the sonographic predictors of difficult laparoscopic cholecystectomy in symptomatic cholelithiasis. Asian J Endosc Surg 2024; 17:e13300. [PMID: 38471517 DOI: 10.1111/ases.13300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 02/19/2024] [Accepted: 02/27/2024] [Indexed: 03/14/2024]
Abstract
BACKGROUND Laparoscopic cholecystectomy (LC) is one of the most common laparoscopic procedures performed by young surgeons nowadays. Sometimes, LC could be challenging, especially for junior surgeons leading to serious complications. Therefore, this study aims to investigate the preoperative ultrasonographic features that could predict difficult LC. METHODS In this prospective study, patients (n = 204) who underwent LC for symptomatic cholelithiasis from January 2020 to August 2022 were included. Preoperative parameters, including the ultrasonographic findings, were evaluated for their ability to predict difficult LC. RESULTS The difficulty of LC was evaluated using two intraoperative scores. Among the ultrasonic parameters that were assessed preoperatively, thickened gallbladder (GB) wall, contracted GB, and impacted stone in the GB neck were associated with difficult LC. However, an impacted stone in the GB neck was the only independent predictor of difficult LC according to both difficulty scores in the multivariate analysis (odds ratio [OR] = 7.56, p = .001; OR = 8.42, p = .001). CONCLUSIONS The impacted stone in the GB neck is an ultrasonographic sign of difficult LC. It should alert the surgeon for a more appropriate preoperative preparation, and the patient should be informed about the increased risk of complications, including conversion to open cholecystectomy.
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Affiliation(s)
- Amr Badawy
- General Surgery Department, Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | - Bessa Samer
- General Surgery Department, Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | - Tarek Sabra
- General Surgery Department, Faculty of Medicine, Assiut University, Assiut, Egypt
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Genet D, Souche R, Roucaute S, Borie F, Millat B, Valats JC, Fabre JM, Herrero A. Upfront Laparoscopic Management of Common Bile Duct Stones: What Are the Risk Factors of Failure? J Gastrointest Surg 2023; 27:1846-1854. [PMID: 37106206 DOI: 10.1007/s11605-023-05687-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 04/15/2023] [Indexed: 04/29/2023]
Abstract
BACKGROUND Treatment of common bile duct stones (CBDS) includes laparoscopic cholecystectomy (LC) with either laparoscopic common bile duct exploration (LCBDE) or perioperative endoscopic retrograde cholangiopancreatography (ERCP). The main objective of this study was to identify predictive factors for the failure of upfront and exclusive surgical treatment by LCBDE. METHODS This is a single-center, retrospective study on patients with CBDS and operated for LC between 2007 and 2019. The use of intra- or postoperative endoscopy for CBD clearance within 6 months after surgery was considered as failure of LCBDE. Predictors for the failure of LCBDE were investigated and outcomes were compared. RESULTS Among 222 operated patients, LCBDE was successfully performed in 173 patients (78%) and 49 (22%) required ERCP with sphincterotomy (intraoperative (n=29) or postoperative (n=20)). Independent risk factors for surgical failure were male sex (OR: 2.525 (1.111-5.738); p=0.027), anesthesia induction time ≥ 4 p.m. (OR: 4.858 (1.731-13.631); p=0.003), pediculitis (OR: 4.147 (1.177-14.606); p=0.027), and thin CDB < 4mm (OR: 11.951 (3.562-40.097), p< 0.0001). Age, ASA score, cystic anatomy, presence of cholecystitis, and the surgeon's experience were not identified as predictors for surgical failure. A general anesthesia number >1 (6% vs. 33%; p < 0.0001), length of initial stay (6 [1-42] vs. 8 [2-27], p=0.012), total length of hospitalization (6 [1-45] vs. 9 [2-27]; p=0.010), and the rate of emergency readmissions (3.5% vs. 12.2%; p=0.027) were significantly higher in the LCBDE failure group. CONCLUSIONS Upfront LCBDE for CBDS was associated with improved outcomes compared to intra-/postoperative ERCP recourse. Male sex, pediculitis, thin CBD, and surgery later than 4 p.m were associated with LCBDE failure and the need for endoscopic treatment. REGISTRATION NUMBER AND AGENCY The present retrospective study was approved by our local ethics committee and was declared on ClinicalTrials.gov (ID: NCT04467710).
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Affiliation(s)
- Diane Genet
- Digestive and Minimally Invasive Surgery Unit, Department of Digestive Surgery and Transplantation, Saint Eloi Hospital, University of Montpellier - Nîmes, 80 Avenue Augustin Fliche, 34295, Montpellier, France
| | - Régis Souche
- Digestive and Minimally Invasive Surgery Unit, Department of Digestive Surgery and Transplantation, Saint Eloi Hospital, University of Montpellier - Nîmes, 80 Avenue Augustin Fliche, 34295, Montpellier, France.
| | - Simon Roucaute
- Digestive and Minimally Invasive Surgery Unit, Department of Digestive Surgery and Transplantation, Saint Eloi Hospital, University of Montpellier - Nîmes, 80 Avenue Augustin Fliche, 34295, Montpellier, France
| | - Frédéric Borie
- Digestive Surgery Department, Carémeau Hospital, University of Montpellier - Nîmes, Place du Professeur Debré, 30900, Nîmes, France
| | - Bertrand Millat
- Digestive and Minimally Invasive Surgery Unit, Department of Digestive Surgery and Transplantation, Saint Eloi Hospital, University of Montpellier - Nîmes, 80 Avenue Augustin Fliche, 34295, Montpellier, France
| | - Jean Christophe Valats
- Department of Gastroenterology, Saint Eloi Hospital, University of Montpellier - Nîmes, 80 Avenue Augustin Fliche, 34295, Montpellier, France
| | - Jean-Michel Fabre
- Digestive and Minimally Invasive Surgery Unit, Department of Digestive Surgery and Transplantation, Saint Eloi Hospital, University of Montpellier - Nîmes, 80 Avenue Augustin Fliche, 34295, Montpellier, France
| | - Astrid Herrero
- Digestive and Minimally Invasive Surgery Unit, Department of Digestive Surgery and Transplantation, Saint Eloi Hospital, University of Montpellier - Nîmes, 80 Avenue Augustin Fliche, 34295, Montpellier, France
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Wang Z, Wang Y, Sun D. A retrospective and prospective study to establish a preoperative difficulty predicting model for video-assisted thoracoscopic lobectomy and mediastinal lymph node dissection. BMC Surg 2022; 22:135. [PMID: 35392865 PMCID: PMC8991718 DOI: 10.1186/s12893-022-01566-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Accepted: 03/18/2022] [Indexed: 12/03/2022] Open
Abstract
Background In previous studies, the difficulty of surgery has rarely been used as a research object. Our study aimed to develop a predictive model to enable preoperative prediction of the technical difficulty of video-assisted thoracoscopic lobectomy and mediastinal lymph node dissection using retrospective data and to validate our findings prospectively. Methods Collected data according to the designed data table and took the operation time as the outcome variable. A nomogram to predict the difficulty of surgery was established through Lasso logistic regression. The prospective datasets were analyzed and the outcome was the operation time. Results This retrospective study enrolled 351 patients and 85 patients were included in the prospective datasets. The variables in the retrospective research were selected by Lasso logistic regression (only used for modeling and not screening), and four significantly related influencing factors were obtained: FEV1/FVC (forced expiratory volume in the first second/forced vital capacity) (p < 0.001, OR, odds ratio = 0.89, 95% CI, confidence interval = 0.84–0.94), FEV1/pred FEV1 (forced expiratory volume in the first second/forced expiratory volume in the first second in predicted) (p = 0.076, OR = 0.98, 95% CI = 0.95–1.00), history of lung disease (p = 0.027, OR = 4.00, 95% CI = 1.27–15.64), and mediastinal lymph node enlargement or calcification (p < 0.001, OR = 9.78, 95% CI = 5.10–19.69). We used ROC (receiver operating characteristic) curves to evaluate the model. The training set AUC (area under curve) value was 0.877, the test set’s AUC was 0.789, and the model had a good calibration curve. In a prospective study, the data obtained in the research cohort were brought into the model again for verification, and the AUC value was 0.772. Conclusion Our retrospective study identified four preoperative variables that are correlated with a longer surgical time and can be presumed to reflect more difficult surgical procedures. Our prospective study verified that the variables in the prediction model (including prior lung disease, FEV1/pred FEV1, FEV1/FVC, mediastinal lymph node enlargement or calcification) were related to the difficulty.
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Affiliation(s)
- Zixiao Wang
- Tianjin Medical University, Heping, Tianjin, 300070, People's Republic of China
| | - Yuhang Wang
- Tianjin Medical University, Heping, Tianjin, 300070, People's Republic of China
| | - Daqiang Sun
- Department of Thoracic Surgery, Tianjin Chest Hospital, Jinnan, Tianjin, 300222, People's Republic of China. .,Department of Thoracic Surgery, Tianjin Hospital of ITCWM Nankai Hospital, No. 6 Changjiang Road, Nankai, Tianjin, 300100, People's Republic of China.
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Ohya H, Maeda A, Takayama Y, Takahashi T, Seita K, Kaneoka Y. Preoperative risk factors for technical difficulty in emergent laparoscopic cholecystectomy for acute cholecystitis. Asian J Endosc Surg 2022; 15:82-89. [PMID: 34291878 DOI: 10.1111/ases.12969] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 06/26/2021] [Accepted: 07/05/2021] [Indexed: 12/11/2022]
Abstract
AIM We have routinely performed emergent laparoscopic cholecystectomy (LC) as soon as we diagnosed acute cholecystitis (AC), if patients could tolerate surgery. This study was conducted to identify the preoperative risk factors that predict the technical difficulty of emergent LC for AC. METHODS A retrospective review of patients with AC who underwent emergent LC between 2012 and 2019 was conducted. Technical difficulty was defined as the presence of the following conditions: open conversion, operative time ≥120 min, or blood loss ≥500 ml. RESULTS In all, 327 patients were included and divided into difficult LC (DLC, n = 61) and nondifficult LC (non-DLC, n = 266). Multivariate logistic analysis revealed that symptom duration ≥72 h was the only independent risk factor for DLC. Comparison of late LC (beyond 72 h, LLC) and early LC (within 72 h, ELC) showed a lower rate of creation of the critical view of safety and a longer hospital stay, as well as a longer operative time, a larger amount of bleeding, and a higher open conversion rate in LLC. However, the postoperative complication rates were equivalent. CONCLUSION LC for AC with symptom duration ≥72 h tends to be technically difficult. However, it is acceptable regarding operative outcomes.
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Affiliation(s)
- Hayato Ohya
- Department of Surgery, Ogaki Municipal Hospital, Ogaki, Japan
| | - Atsuyuki Maeda
- Department of Surgery, Ogaki Municipal Hospital, Ogaki, Japan
| | - Yuichi Takayama
- Department of Surgery, Ogaki Municipal Hospital, Ogaki, Japan
| | | | - Kazuaki Seita
- Department of Surgery, Ogaki Municipal Hospital, Ogaki, Japan
| | - Yuji Kaneoka
- Department of Surgery, Ogaki Municipal Hospital, Ogaki, Japan
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Ábrahám S, Németh T, Benkő R, Matuz M, Váczi D, Tóth I, Ottlakán A, Andrási L, Tajti J, Kovács V, Pieler J, Libor L, Paszt A, Simonka Z, Lázár G. Evaluation of the conversion rate as it relates to preoperative risk factors and surgeon experience: a retrospective study of 4013 patients undergoing elective laparoscopic cholecystectomy. BMC Surg 2021; 21:151. [PMID: 33743649 PMCID: PMC7981808 DOI: 10.1186/s12893-021-01152-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 03/11/2021] [Indexed: 01/11/2023] Open
Abstract
Background Our aim is to determine the relationships among patient demographics, patient history, surgical experience, and conversion rate (CR) during elective laparoscopic cholecystectomies (LCs). Methods We analyzed data from patients who underwent LC surgery between 2005 and 2014 based on patient charts and electronic documentation. CR (%) was evaluated in 4013 patients who underwent elective LC surgery. The relationships between certain predictive factors (patient demographics, endoscopic retrograde cholangiopancreatography (ERCP), acute cholecystitis (AC), abdominal surgery in the patient history, as well as surgical experience) and CR were examined by univariate analysis and logistic regression. Results In our sample (N = 4013), the CR was 4.2%. The CR was twice as frequent among males than among females (6.8 vs. 3.2%, p < 0.001), and the chance of conversion increased from 3.4 to 5.9% in patients older than 65 years. The detected CR was 8.8% in a group of patients who underwent previous ERCP (8.8 vs. 3.5%, p < 0.001). From the ERCP indications, most often, conversion was performed because of severe biliary tract obstruction (CR: 9.3%). LC had to be converted to open surgery after upper and lower abdominal surgeries in 18.8 and 4.8% cases, respectively. Both AC and ERCP in the patient history raised the CR (12.3%, p < 0.001 and 8.8%, p < 0.001). More surgical experience and high surgery volume were not associated with a lower CR prevalence. Conclusions Patient demographics (male gender and age > 65 years), previous ERCP, and upper abdominal surgery or history of AC affected the likelihood of conversion. More surgical experience and high surgery volume were not associated with a lower CR prevalence.
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Affiliation(s)
- Szabolcs Ábrahám
- Department of Surgery, Szent-Györgyi Albert Medical and Pharmaceutical Center, University of Szeged, Semmelweis u. 8, 6725, Szeged, Hungary.
| | - Tibor Németh
- Department of Surgery, Szent-Györgyi Albert Medical and Pharmaceutical Center, University of Szeged, Semmelweis u. 8, 6725, Szeged, Hungary
| | - Ria Benkő
- Department of Clinical Pharmacy, University of Szeged, Szeged, Hungary
| | - Mária Matuz
- Department of Clinical Pharmacy, University of Szeged, Szeged, Hungary
| | - Dániel Váczi
- Department of Surgery, Szent-Györgyi Albert Medical and Pharmaceutical Center, University of Szeged, Semmelweis u. 8, 6725, Szeged, Hungary
| | - Illés Tóth
- Department of Surgery, Szent-Györgyi Albert Medical and Pharmaceutical Center, University of Szeged, Semmelweis u. 8, 6725, Szeged, Hungary
| | - Aurél Ottlakán
- Department of Surgery, Szent-Györgyi Albert Medical and Pharmaceutical Center, University of Szeged, Semmelweis u. 8, 6725, Szeged, Hungary
| | - László Andrási
- Department of Surgery, Szent-Györgyi Albert Medical and Pharmaceutical Center, University of Szeged, Semmelweis u. 8, 6725, Szeged, Hungary
| | - János Tajti
- Department of Surgery, Szent-Györgyi Albert Medical and Pharmaceutical Center, University of Szeged, Semmelweis u. 8, 6725, Szeged, Hungary
| | - Viktor Kovács
- Department of Surgery, Szent-Györgyi Albert Medical and Pharmaceutical Center, University of Szeged, Semmelweis u. 8, 6725, Szeged, Hungary
| | - József Pieler
- Department of Surgery, Szent-Györgyi Albert Medical and Pharmaceutical Center, University of Szeged, Semmelweis u. 8, 6725, Szeged, Hungary
| | - László Libor
- Department of Surgery, Szent-Györgyi Albert Medical and Pharmaceutical Center, University of Szeged, Semmelweis u. 8, 6725, Szeged, Hungary
| | - Attila Paszt
- Department of Surgery, Szent-Györgyi Albert Medical and Pharmaceutical Center, University of Szeged, Semmelweis u. 8, 6725, Szeged, Hungary
| | - Zsolt Simonka
- Department of Surgery, Szent-Györgyi Albert Medical and Pharmaceutical Center, University of Szeged, Semmelweis u. 8, 6725, Szeged, Hungary
| | - György Lázár
- Department of Surgery, Szent-Györgyi Albert Medical and Pharmaceutical Center, University of Szeged, Semmelweis u. 8, 6725, Szeged, Hungary
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Hirohata R, Abe T, Amano H, Hanada K, Kobayashi T, Ohdan H, Noriyuki T, Nakahara M. Identification of risk factors for open conversion from laparoscopic cholecystectomy for acute cholecystitis based on computed tomography findings. Surg Today 2020; 50:1657-1663. [PMID: 32627066 DOI: 10.1007/s00595-020-02069-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 05/28/2020] [Indexed: 11/26/2022]
Abstract
PURPOSE Laparoscopic cholecystectomy (LC) is performed widely for acute cholecystitis (AC). This study was conducted to identify the predictors for conversion cholecystectomy (CC) for AC. METHODS The subjects of this study were 395 patients who underwent emergency surgery for AC between 2011 and 2019. Univariate and multivariate analyses were performed to establish the significance of the risk factors for CC in patients with grades II and III AC. RESULTS There were 162 TG18 GII and GIII patients in the LC group and 31 in the CC group. Univariate analysis revealed significant differences in performance status (p = 0.039), C-reactive protein levels (p = 0.016), albumin levels (p = 0.002), gallbladder (GB) wall thickness (p = 0.045), poor contrast of the GB wall (p = 0.035), severe inflammation around the GB (p < 0.001), enhancement of the liver bed (p = 0.048), and duodenal edema (p < 0.001) between the groups. Multivariate analysis identified hypoalbuminemia (p = 0.043) and duodenal edema (p = 0.014) as independent risk factors for CC. CONCLUSIONS Most patients with grade I AC underwent LC and had better surgical outcomes than those with grades II and III AC. The most appropriate surgical procedure should be selected based on preoperative imaging of the GB and the neighboring organs and by the presence of hypoalbuminemia.
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Affiliation(s)
- Ryosuke Hirohata
- Department of Surgery, Onomichi General Hospital, 1-10-23 Hirahara, Onomichi, Hiroshima, Japan
| | - Tomoyuki Abe
- Department of Surgery, Onomichi General Hospital, 1-10-23 Hirahara, Onomichi, Hiroshima, Japan.
| | - Hironobu Amano
- Department of Surgery, Onomichi General Hospital, 1-10-23 Hirahara, Onomichi, Hiroshima, Japan
- Department of Gastroenterological and Transplant Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi 1-2-3 Minami-ku, Hiroshima, Hiroshima, Japan
| | - Keiji Hanada
- Department of Gastroenterology, Onomichi General Hospital, 1-10-23 Hirahara, Onomichi, Hiroshima, Japan
| | - Tsuyoshi Kobayashi
- Department of Gastroenterological and Transplant Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi 1-2-3 Minami-ku, Hiroshima, Hiroshima, Japan
| | - Hideki Ohdan
- Department of Gastroenterological and Transplant Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi 1-2-3 Minami-ku, Hiroshima, Hiroshima, Japan
| | - Toshio Noriyuki
- Department of Surgery, Onomichi General Hospital, 1-10-23 Hirahara, Onomichi, Hiroshima, Japan
- Department of Gastroenterological and Transplant Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi 1-2-3 Minami-ku, Hiroshima, Hiroshima, Japan
| | - Masahiro Nakahara
- Department of Surgery, Onomichi General Hospital, 1-10-23 Hirahara, Onomichi, Hiroshima, Japan
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Nakazawa A, Akamatsu N, Miyata Y, Komagome M, Maki A, Arita J, Ishizawa T, Kaneko J, Beck Y, Hasegawa K. Usefulness of preoperative drip infusion cholangiography with computed tomography for predicting surgical difficulty during laparoscopic cholecystectomy. JOURNAL OF HEPATO-BILIARY-PANCREATIC SCIENCES 2020; 27:315-323. [PMID: 31971340 DOI: 10.1002/jhbp.718] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 12/24/2019] [Accepted: 01/16/2020] [Indexed: 12/22/2022]
Abstract
BACKGROUND Drip infusion cholangiography with computed tomography (DIC-CT) is a major preoperative modality used for patients undergoing laparoscopic cholecystectomy (LC). METHODS This study included 218 patients for whom preoperative DIC-CT images were obtained prior to undergoing LC. The association between gallbladder (GB) opacification in DIC-CT and the operative time was assessed. RESULTS The GB opacification on the DIC-CT images was classified as follows: Grade 0, homogeneous opacification; Grade 1, heterogeneous opacification; Grade 2, only cystic duct can be identified; and Grade 3, no opacification. Images obtained for the 218 patients showed 41 (18.8%) with Grade 0, 91 (41.7%) with Grade 1, 54 (24.8%) with Grade 2, and 32 (14.7%) with Grade 3. The operative time and intraoperative blood loss were significantly longer and larger, respectively, in cases classified as Grade 2 or 3 (GB negative) compared with cases classified as Grade 0 or 1 (GB positive). We created an LC difficulty score based on the following variables that were significant independent predictors of increased operative time: GB negativity in DIC-CT (P = .002, 2 points), GB wall thickness (P = .002, 2 points), body mass index (P = .015, 1 point), preoperative alkaline phosphatase value (P = .018, 1 point), and preoperative C-reactive protein value (P = .04, 1 point). The LC difficulty score (Grade A, score 0-2; Grade B, score 3-5; and Grade C, score 6-7) was significantly associated with a prolonged operative time. CONCLUSION Drip infusion cholangiography with computed tomography is useful for predicting the surgical difficulty of LC.
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Affiliation(s)
- Akiko Nakazawa
- Hepato-Biliary-Pancreatic Surgery Division and Artificial Organ and Transplantation Division, Department of Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.,Department of Hepato-biliary-pancreatic Surgery, Saitama Medical Center, Saitama Medical University, Saitama, Japan
| | - Nobuhisa Akamatsu
- Hepato-Biliary-Pancreatic Surgery Division and Artificial Organ and Transplantation Division, Department of Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Yoichi Miyata
- Hepato-Biliary-Pancreatic Surgery Division and Artificial Organ and Transplantation Division, Department of Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.,Department of Hepato-biliary-pancreatic Surgery, Saitama Medical Center, Saitama Medical University, Saitama, Japan
| | - Masahiko Komagome
- Department of Hepato-biliary-pancreatic Surgery, Saitama Medical Center, Saitama Medical University, Saitama, Japan
| | - Akira Maki
- Department of Hepato-biliary-pancreatic Surgery, Saitama Medical Center, Saitama Medical University, Saitama, Japan
| | - Junichi Arita
- Hepato-Biliary-Pancreatic Surgery Division and Artificial Organ and Transplantation Division, Department of Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Takeaki Ishizawa
- Hepato-Biliary-Pancreatic Surgery Division and Artificial Organ and Transplantation Division, Department of Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Junichi Kaneko
- Hepato-Biliary-Pancreatic Surgery Division and Artificial Organ and Transplantation Division, Department of Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Yoshifumi Beck
- Department of Hepato-biliary-pancreatic Surgery, Saitama Medical Center, Saitama Medical University, Saitama, Japan
| | - Kiyoshi Hasegawa
- Hepato-Biliary-Pancreatic Surgery Division and Artificial Organ and Transplantation Division, Department of Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
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