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Dive into the research topics where Hirofumi Kon is active.

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Featured researches published by Hirofumi Kon.


Surgery Today | 1998

Metabolism of prostaglandins in porcine liver transplantation with a graft harvested after 30- and 60-minute warm ischemia

Hideya Isai; Jun Kimura; Koji Ito; Motoshi Tamura; Hirofumi Kon; Hirofumi Kamachi; Masato Takahashi; Kenichiro Yamashita; Takeshi Shimamura; Yasuaki Nakajima

The influence of warm ischemia on the metabolism of prostaglandins was investigated using a pig liver transplantation model employing the temporary portal arterialization technique. Eighteen pigs were divided into three groups according to warm ischemia time: 0 min (group I,n=6), 30 min (group II,n=6), and 60 min (group III,n=6). During portal arterialization, the hepatic venous prostaglandin E2 (PGE2) level in group III (3356.0±1011.8pg/ml) was significantly higher than that in group I (831.7±182.1pg/ml;P=0.0285). The hepatic venous PGE2 levels were significantly higher than the arterial counterparts in all groups both at the beginning and during portal arterialization. At 60 min after portal revascularization, the arterial PGE2 level in group III (886.7±268.0pg/ml) was significantly higher than that in groups I (99.0±18.6 pg/ml;P=0.0116) and II (204.2±65.4pg/ml;P=0.0282). Neither thromboxane B2 (TXB2) nor 6-keto PGF1α showed any significant differences. In conclusion, the intra-operative changes of PGE2 thus reflected the degree of warm ischemic damage, and PGE2 could also be released from the graft. On the other hand, the increased levels of TXB2 and 6-keto PGF1α were throught to have an extrahepatic origin.


Kanzo | 1994

Isolation and culture of human hepatocytes from resected liver tissue.

Manabu Takahashi; Michiaki Matsuhita; Hirofumi Kon; Hirokazu Matsue; Kazuhiro Sato; Hiromitsu Noto; Koichi Taguchi; Masahiko Koike; Makoto Nishikawa; Hirofumi Kamachi; Yasuaki Nakajima; Junichi Uchino

手術時切除肝を用いてヒト肝細胞の分離培養を行い,単離肝細胞の収量,viability,培養肝細胞機能が入手肝組織の温阻血時間といかなる関係にあるかを検討した.肝細胞の分散はコラゲナーゼとディスパーゼの混合液を灌流することにより行い,分散された肝細胞を10日間培養し,糖新生能,尿素合成能,DNA量を測定した.入手肝組織の温阻血時間は,0-300分であった.その結果,単離肝細胞のviabilityは肝温阻血時間と関係がなく87.9%であったが,収量との間には有意の相関関係を認めた(p<0.05).温阻血時間が120分以内における収量は180分以上と比較し有意に高かった(p<0.05).培養肝細胞機能は10日間維持され,機能は温阻血の影響を受けなかった.以上から,肝細胞の分離培養で肝組織の温阻血時間が長くなると単離肝細胞の収量は減少するが,120分までは,収量およびviabilityともに良好である.また,温阻血障害を受けた肝細胞を培養することによりその機能が完全に回復するものと考えられた.


Jpn J Gastroenterol Surg, Nihon Shokaki Geka Gakkai zasshi | 1992

Preoperative Radiation Therapy and Surgery in Three Patients with Hepatocellular Carcinoma with a Tumor Thrombus in the Portal Trunk.

Tsuyoshi Shimamura; Yasuaki Nakajima; Naoki Sato; Shinichi Matsuoka; Kazuhito Misawa; Toshiya Kamiyama; Eisuke Nagabuchi; Hirofumi Kon; Hideki Kawamura; Ichirou Tsuda; Yoshie Une; Junichi Uchino

門脈本幹に腫瘍塞栓を合併する肝細胞癌3例において, 腫瘍塞栓に対し放射線照射を施行し, 腫瘍塞栓の縮小後に肝切除を行った. 症例は39歳の女性, 57歳の男性, 38歳の男性で, 術前に腫瘍塞栓に対し30.0~34.5Gyの放射線照射を施行した. 全例で腫瘍塞栓の門脈1次分枝までの退縮を認め, おのおの右3区域切除, 拡大右葉切除, 右葉切除を定型的に行った. 病理組織学的変化では, 全例に腫瘍塞栓の変性, 壊死が高度に認められ, 術中操作による経門脈性播種の危険性を低下させると考えられた. 術前放射線照射を併用しなかったVp3切除症例の平均生存期間が診断より7.5か月, 術後無再発期間の平均が1.7か月であったのに対し, これら術前放射線照射を併用した肝切除症例では, おのおの13.3か月, 5.3か月と有意に延長しており, 術前放射線照射併用肝切除術の有効性が示唆された.


Artificial Organs | 2008

OPTIMAL OXYGEN TENSION CONDITIONS FOR FUNCTIONING CULTURED HEPATOCYTES IN VITRO

Makoto Nishikawa; Junichi Uchino; Michiaki Matsushita; Manabu Takahashi; Koichi Taguchi; Masahiko Koike; Hirofumi Kamachi; Hirofumi Kon


Nihon Rinsho Geka Gakkai Zasshi (journal of Japan Surgical Association) | 2013

A CASE REPORT OF RECURRENT INTESTINAL PERFORATIONS CAUSED BY CHOLESTEROL CRYSTAL EMBOLIZATION

Hirotaka Shouji; Hirofumi Kon; Yuuji Konishi; Kazuhiro Mino; Tomonari Katayama; Masahiko Koike


Nihon Rinsho Geka Gakkai Zasshi (journal of Japan Surgical Association) | 2017

A Pediatric Case of Gallbladder Torsion Treated by Laparoscopic Surgery—A Case Report—

Keisuke Obuchi; Keisa Takeda; Ryohei Murata; Masaaki Zaitsu; Hirofumi Kon; Masahiko Koike


The Japanese Journal of Gastroenterological Surgery | 2016

Cholesterol Crystal Embolisation as a Cause of an Intraluminal Mass in the Gallbladder Mimicking Carcinoma

Yuji Otsuki; Hirofumi Kon; Keisa Takeda; Masahiko Koike; Yoshinobu Akasaka


Nihon Rinsho Geka Gakkai Zasshi (journal of Japan Surgical Association) | 2015

Two Cases of Accessory Liver Attached to the Gallbladder that were Removed by Laparoscopic Surgery

Yuji Otsuki; Hirofumi Kon; Keisa Takeda; Masahiko Koike


Journal of Japanese Society for Dialysis Therapy | 2015

Tuberculous lymphadenitis in a hemodialysis patient–A case report

Yuzuru Sakamoto; Hirofumi Kon; Sari Iwasaki; Hirotaka Shyoji; Michio Tani; Kaname Koyanagi; Yoshinobu Akasaka


Nihon Rinsho Geka Gakkai Zasshi (journal of Japan Surgical Association) | 2013

A case of malignant lymphoma arising in the mesentery differentiated from postoperative abscess remnant with difficulty

Kazuhiro Mino; Tomonari Katayama; Hirofumi Kon; Sari Iwasaki; Akira Suzuki; Masahiko Koike

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