Publications by authors named "Yuji Nimura"

Purpose: This study sought to investigate the efficacy of Tabata-style high-intensity interval training (T-HIIT) on athletic performance in judoka and to determine the impact of the fecal organic acid profile before training on the improvement of athletic performance.

Methods: Twenty males from Aichi University Judo Club (10 high-level competitors and 10 others) were included. Physical fitness tests such as the Uchikomi shuttle run, countermovement jump, squat jump, and chin-ups using a judo uniform were performed before and after T-HIIT.

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Cholelithiasis is one of the commonest diseases in gastroenterology. Remarkable improvements in therapeutic modalities for cholelithiasis and its complications are evident. The Japanese Society of Gastroenterology has revised the evidence-based clinical practice guidelines for cholelithiasis.

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Purpose: To clarify the incidence, clinicopathological features and prognosis of pancreatic invasive ductal carcinomas (IDCs) with different tumor origin sites in the pancreatic duct.

Methods: Based on the relationship between the invasive cancer area (ICA) and the main pancreatic duct (MPD), IDCs less than 2 cm in diameter were classified into two groups: type I, in which the ICA and MPD were separated, and type II, in which the MPD passed through the ICA. The clinicopathological findings and prognosis of each type were compared in a total of 37 patients.

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Objective: To review our experiences with surgery for recurrent biliary tract cancer (BTC).

Background: Few studies have reported on surgical procedures for recurrent BTC; therefore, it is unclear whether this surgery has survival benefit.

Methods: Between 1991 and 2010, 606 patients had recurrences after resection of BTC (gallbladder cancer, n = 135; cholangiocarcinoma, n = 471); 74 patients underwent resection for recurrence, whereas the remaining 532 did not.

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Intrahepatic cholangiocarcinoma involving all major hepatic veins was diagnosed in a 62-year-old man. Multidetector-row computed tomography showed a massive tumor occupying segments 2-5, 7, and 8, with invasion of all major hepatic veins, although the inferior right hepatic vein, draining the venous flow of segment 6, was clearly visualized. Therefore, we planned an extended left trisectionectomy, involving resection of segments 1-5, 7, and 8, with extrahepatic bile duct resection and concomitant resection of all major hepatic veins.

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Assessment of surgical resectability in cholangiocarcinoma is more complicated than other gastrointestinal malignancies and remains unestablished. According to the primary origin and tumor extent, the applied surgical procedure varies from extrahepatic bile duct resection to right or left trisectionectomy concomitant with pancreatoduodenectomy. Portal vein resection and reconstruction during hepatectomy has been feasible.

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Background: In patients with distal bile duct cancer involving the hepatic hilus, a major hepatectomy concomitant with pancreatoduodenectomy (HPD) is sometimes ideal to obtain a cancer-free resection margin. However, the surgical invasiveness of HPD is considerable.

Patients And Methods: We present our treatment option for patients with distal bile duct cancer showing mucosal spreading to the hepatic hilum associated with impaired liver function.

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Background: Few studies have documented catastrophic head and neck injuries in judo, but these injuries deserve greater attention.

Purpose: To determine the features of catastrophic head and neck injuries in judo.

Study Design: Descriptive epidemiological study.

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Objective: To analyze lymph node status in resected perihilar cholangiocarcinoma, to clarify which index (ie, location, number, or ratio of involved nodes) is better for staging, and to determine the minimum requirements for node examination.

Background: In the TNM classification for perihilar cholangiocarcinoma, the number or ratio of involved nodes is not considered for nodal staging. The minimum requirement for histologic examination of lymph nodes is arbitrary.

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Objective: To review our 34-year experience with 574 consecutive resections for perihilar cholangiocarcinoma and to evaluate the progress made in surgical treatment of this disease.

Background: Few studies have reported improved surgical outcomes for perihilar cholangiocarcinoma; therefore, it is still unclear whether surgical treatment of this intractable disease has progressed.

Methods: Between April 1977 and December 2010, a total of 754 consecutive patients with perihilar cholangiocarcinoma were treated, of whom 574 (76.

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Objective: To outline our experience with hepatopancreatoduodenectomy (HPD) as a treatment for cholangiocarcinoma and to appraise the clinical significance of this challenging procedure.

Background: Cholangiocarcinomas often exhibit an extensive ductal spread invading from the hepatic hilus to the lower bile duct, and such tumors can be completely resected only by HPD. Early experiences with HPD were associated with high mortality and morbidity, leading to an underestimation of the survival benefit of HPD.

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Background: High incidence of gallbladder cancer (GBC) is reported from North India, with elevated concentrations of heavy metals in water and soil. This Indo-Japan collaborative study compared presence of heavy metals in gallbladder tissues.

Methods: Heavy metal concentrations were estimated in Indian GBC and cholecystitis tissues and compared with Japanese GBC and cholecystitis tissues.

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Background/purpose: Complications from biliary drainage in biliary tract cancer (BTC) may influence the relative dose intensity of chemotherapy or increase adverse events during chemotherapy. BT22 was a randomized phase II trial, the results of which were consistent with those of a phase III trial in non-Japanese that demonstrated the effectiveness of gemcitabine plus cisplatin combination therapy (GC) in BTC. The purpose of this exploratory analysis of the BT22 study was to identify the possible effects of biliary drainage on the efficacy and safety of GC or gemcitabine monotherapy (G).

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The goal of this study is to elucidate the characteristic features of Judo head injuries and to propose safety measures and a reaction manual on how to prevent and to deal with such accidents in Japan. Thirty cases of severe head injuries suffered during Judo practice were enrolled in this study. They have made insurance claims for damage compensation and inquiries about Judo accidents attributed to the All Japan Judo Federation, from 2003 to 2010.

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Background: The value of pancreatoduodenectomy (PD) with extended lymphadenectomy for pancreatic cancer has been evaluated by many retrospective studies and 3 randomized controlled trials (RCT). However, the protocols used and the results found in the 3 RCTs were diverse. Therefore, a multicenter RCT was proposed in 1998 to evaluate the primary end point of long-term survival and the secondary end points of morbidity, mortality and quality of life of patients undergoing standard versus extended lymphadenectomy in radical PD for pancreatic cancer.

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Background: A standardized definition of post-hepatectomy haemorrhage (PHH) has not yet been established.

Methods: An international study group of hepatobiliary surgeons from high-volume centres was convened and a definition of PHH was developed together with a grading of severity considering the impact on patients' clinical management.

Results: The definition of PHH varies strongly within the hepatic surgery literature.

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Perihilar cholangiocarcinoma is one of the most challenging diseases with poor overall survival. The major problem for anyone trying to convincingly compare studies among centers or over time is the lack of a reliable staging system. The most commonly used system is the Bismuth-Corlette classification of bile duct involvement, which, however, does not include crucial information such as vascular encasement and distant metastases.

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Malignant epithelioid variant of angiomyolipoma has aggressive characteristics, against which conventional cytotoxic agents have been reported to be disappointingly inactive, and the prognosis of unresectable or recurrent disease is dismal poor. A 52-year-old man with a history of left nephrectomy for epithelioid angiomyolipoma was referred to our institution. The computed tomographic scan showed a soft tissue dense mass around the Rex's recess and behind the spleen, and a large pelvic mass.

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Pathological complete response to systemic chemotherapy is associated with more favorable survival in patients with colorectal cancer liver metastases. We present a case of a 63-year-old man with multiple liver metastases from descending colon cancer. Following surgical resection of the primary tumor, the patient received systemic chemotherapy with S-1 and oxaliplatin in combination with bevacizumab.

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Background: Despite the potentially severe impact of bile leakage on patients' perioperative and long-term outcome, a commonly used definition of this complication after hepatobiliary and pancreatic operations has not yet been established. The aim of the present article is to propose a uniform definition and severity grading of bile leakage after hepatobiliary and pancreatic operative therapy.

Methods: An international study group of hepatobiliary and pancreatic surgeons was convened.

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Background: Posthepatectomy liver failure is a feared complication after hepatic resection and a major cause of perioperative mortality. There is currently no standardized definition of posthepatectomy liver failure that allows valid comparison of results from different studies and institutions. The aim of the current article was to propose a definition and grading of severity of posthepatectomy liver failure.

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We report a case of successful embolization of jejunal varices that were the cause of massive gastrointestinal bleeding from a choledochojejunostomy site, resulting from obstruction of the extrahepatic portal vein. A 42-year-old man who had undergone choledochojejunostomy for intrahepatic and choledochal stones was readmitted after he started passing massive dark bloody stools. Gastrointestinal endoscopic examination and angiography could not identify the source of bleeding.

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Objective: To outline our experience with hepatectomy with simultaneous resection of the portal vein and hepatic artery for advanced perihilar cholangiocarcinoma, and to discuss the clinical significance of this challenging hepatectomy.

Summary Background Data: Only a few authors reported negative results for this surgery in a very limited number of patients.

Methods: We retrospectively reviewed medical records of 50 patients with advanced cholangiocarcinoma who underwent hepatectomy (left trisectionectomy in 26, left hepatectomy in 23, and right hepatectomy in 1) with simultaneous resection and reconstruction of the portal vein and hepatic artery, focusing on surgical outcome and survival.

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Prognosis of cancers with lymph node metastasis is known to be very poor; however, it is still controversial whether metastatic potential can be evaluated by expression profiles of primary tumors. Therefore, to address this issue, we compared gene expression profiles of 24 esophageal squamous cell carcinomas (ESCCs) with extensive lymph node metastasis and 11 ESCCs with no metastatic lymph node. However, there was no gene cluster distinguishing these two groups, suggesting that lymph node metastasis-associated genes are varied depending on cases or subgroups.

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Polycomb group protein EZH2, frequently overexpressed in malignant tumors, is the catalytic subunit of polycomb repressive complex 2 (PRC2). PRC2 interacts with HDACs in transcriptional silencing and relates to tumor suppressor loss. We examined the expression of HDAC isoforms (HDAC 1 and 2) and EZH2, and evaluated the possible use of HDAC inhibitor suberoylanilide hydroxamic acid (SAHA) and EZH2 repressor for gallbladder carcinoma.

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