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968 results on '"Koga, Hiroyuki"'

3. Cholestasis after Kasai operation predicts portal hypertension in native liver survivors of biliary atresia: a multicenter study

Author

Chung, Patrick Ho Yu, Harumatsu, Toshio, Nakagawa, Yoichi, Tsuboi, Koichi, Chan, Edwin Kin Wai, Leung, Michael Wai Yip, Yeung, Fanny, Muto, Mitsuru, Kawano, Takafumi, Amano, Hizuru, Shirota, Chiyoe, Nakamura, Hiroki, Koga, Hiroyuki, Miyano, Go, Yamataka, Atsuyuki, Ieiri, Satoshi, Uchida, Hiroo, and Wong, Kenneth Kak Yuen

Published
2024
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19. Impact of Epithelial Claudin-4 and Leukotriene B4 Receptor 2 in Normoganglionic Hirschsprung Disease Colon on Post Pull-through Enterocolitis

Author

Abe, Kumpei, Takeda, Masahiro, Ishiyama, Asuka, Shimizu, Masahiro, Goto, Hiroki, Iida, Hisae, Fujimoto, Takashi, Ueda-Abe, Eri, Yamada, Shunsuke, Fujiwara, Kentaro, Shibuya, Soichi, Ochi, Takanori, Arii, Rumi, Yazaki, Yuta, Miyano, Go, Urao, Masahiko, Okazaki, Tadaharu, Koga, Hiroyuki, Lane, Geoffrey J., Yamataka, Atsuyuki, and Suda, Kazuto

Published
2024
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20. Liver Mitochondrial Morphology and Gene Expression as Markers of Liver Reserve: Prognostic Implications for Native Liver Survival in Biliary Atresia

Author

Fujimoto, Takashi, Goto, Hiroki, Hida, Masataka, Tsuboi, Koichi, Suzuki, Takamasa, Iida, Hisae, Fukada, Ayaka, Shimizu, Sakika, Ebata, Yu, Nikai, Koki, Ishii, Junya, Takeda, Masahiro, Ishiyama, Asuka, Shibuya, Soichi, Yazaki, Yuta, Nakazawa-Tanaka, Nana, Miyano, Go, Okazaki, Tadaharu, Yanai, Toshihiro, Urao, Masahiko, Suzuki, Mitsuyoshi, Koga, Hiroyuki, Lane, Geoffrey J., Yamataka, Atsuyuki, and Suda, Kazuto

Published
2024
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33. Role of percutaneous transhepatic biliary drainage for managing bile lake formation after Kasai portoenterostomy.

Author

Castrillo, Alejandra, Shibuya, Soichi, Ueda, Eri, López, Manuel, Lane, Geoffrey J., Kuwatsuru, Ryohei, Yamataka, Atsuyuki, and Koga, Hiroyuki

Abstract

Purpose: Bile lake (BL) formation following Kasai portoenterostomy (KPE) can complicate the prognosis of biliary atresia (BA). Percutaneous transhepatic biliary drainage (PTBD) performed under fluoroscopic/ultrasonographic (US) guidance is discussed for the management of BL. Methods: A retrospective review of 64 BA patients treated by KPE (open = 31, laparoscopic = 33) at a single center (2004–2023) identified 9 BL cases (9/64; 14.1%). PTBD was indicated for jaundice or cholangitis refractory to antibiotic therapy. Results: All BL were asymptomatic, diagnosed after an episode of postoperative cholangitis. KPE type was not correlated with BL incidence; 2/31 (6.5%) for open and 7/33 (21.2%) for laparoscopic; p = 0.15. Median onset was postoperative day 273 (IQR: 170–920). One case resolved with antibiotics while another case required early liver transplantation (LTx) due to advanced hepatic dysfunction unrelated to BL. All remaining cases (7/9) had PTBD at a median of 14.3 months (IQR: 7.3–34.7) post-KPE, with successful resolution in 6/7; one case required two PTBD procedures. Post-PTBD biliary peritonitis (n = 3) was resolved by abdominal lavage (laparoscopic = 2; open = 1). Conclusion: Screening for BL is advisable in all postoperative BA patients especially when cholangitis occurs. Although the risk for biliary peritonitis warrants caution, PTBD seems a viable option for managing BL formation after KPE. [ABSTRACT FROM AUTHOR]

Published
2024
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43. Optical Trocar Access for Retroperitoneal Robotic-Assisted Pyeloplasty in Children with Ureteropelvic Junction Obstruction.

Author

Koga, Hiroyuki, Yamada, Shunsuke, Takeda, Masahiro, Ochi, Takanori, Seo, Shogo, Shibuya, Soichi, Yazaki, Yuta, Fujiwara, Naho, Arii, Rumi, Lane, Geoffrey J., and Yamataka, Atsuyuki

Abstract

Purpose: Retroperitoneal robotic-assisted pyeloplasty (ret-RAP) for ureteropelvic junction obstruction (UPJO) requires a larger retroperitoneal space (RS) to maintain specified distances between robotic (da Vinci) trocars and between trocars and the region of interest. A modified closed technique (MOT) and conventional closed technique (COT) were compared for creating an adequate RS with optical trocars. Methods: RS access in children with UPJO who underwent ret-RAP (n = 30) was MOT (n = 15) and COT (n = 15). All patients were positioned laterally. For MOT, a 5 mm optical trocar was inserted at the angle formed between the 12th rib and the erector spinae muscles. As the trocar was advanced under direct vision, it pierced the superficial subcutaneous layer, Scarpa's fascia, lumbar fascia, internal/external oblique and transversus abdominalis muscles, and the posterior renal fascia. Once in the RS, the tip of the scope was used for blunt dissection of perirenal fat, the tip was withdrawn until it was outside the perirenal fascia, and used to dissect toward the anterior abdomen in the pararenal fat layer. Results: Ages and weights at ret-RAP were similar (MOT: 5.6 ± 1.8 years versus COT: 7.8 ± 4.6 years; MOT: 20.6 ± 10.1 kg versus COT: 27.6 ± 13.9 kg). Times for RS access were similar (MOT: 1.6 ± 0.5 minutes versus COT: 1.9 ± 0.7 minutes), but RS expansion was significantly quicker in MOT (32.3 ± 8.7 minutes versus 52.0 ± 15.1 minutes; P < .001). Peritoneal injury caused carbon dioxide leakage in 4 of 15 COT cases and 0 of 15 MOT cases. Conclusion: RS expansion with MOT was safer because there were no peritoneal injuries and MOT was quicker than COT. [ABSTRACT FROM AUTHOR]

Published
2024
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44. Biopsy Diagnosis of Hirschsprung's Disease Using a Single Excisional Biopsy Based on the Anorectal Line.

Author

Takeda, Masahiro, Ochi, Takanori, Koga, Hiroyuki, Tsuboi, Koichi, Arakawa, Atsushi, Lane, Geoffrey J., and Yamataka, Atsuyuki

Subjects
HIRSCHSPRUNG'S disease, BIOPSY, DIAGNOSIS, DEFECATION disorders
Abstract

Introduction A biopsy protocol for diagnosing Hirschsprung's disease (HD) in children using the anorectal line (ARL). Materials and Methods The ARL was adopted for diagnosing HD in 2016 using two excisional submucosal rectal biopsies performed at different levels, sequentially; the first just above the ARL and the second, further proximal (2-ARL). Currently, only the first-level biopsy is performed (1-ARL) and examined intraoperatively. Management was observation if normoganglionic, pull-through if aganglionic, and a second-level biopsy if hypoganglionic. Hypoganglionosis was considered physiologic if the second-level biopsy was normoganglionic and pathologic if hypoganglionic. Colon caliber change and bowel obstructive symptoms reflect the severity of hypoganglionosis. Results For 2-ARL (n = 54), results were: normoganglionosis (n = 31/54; 57.4%), aganglionosis (n = 19/54; 35.2%), and hypoganglionosis (n = 4/54; 7.4%); physiologic (n = 3/54; 5.6%) and pathologic (n = 1/54; 1.9%). Normoganglionosis and aganglionosis were always duplicated in 2-ARL (kappa = 1.0). For 1-ARL (n = 36), results were: normoganglionosis (n = 17/36; 47.2%), aganglionosis (n = 17/36; 47.2%), and hypoganglionosis (n = 2/36; 5.6%). Second-level biopsies were normoganglionic (physiologic: n = 1) and hypoganglionic (pathologic: n = 1). All normoganglionic cases, except one, resolved conservatively. All aganglionic cases had pull-through with HD confirmed on histopathology. Both pathologic hypoganglionic cases had caliber change and severe obstructive symptoms as definitive indications for pull-through with hypoganglionosis of the entire rectum confirmed on histopathology. Physiologic hypoganglionic cases were observed and currently have regular defecation. Conclusion Because the ARL is an objective functional, neurologic, and anatomic demarcation, normoganglionosis and aganglionosis can be diagnosed accurately with a single excisional biopsy. Only hypoganglionosis requires a second-level biopsy. [ABSTRACT FROM AUTHOR]

Published
2024
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45. Choledochal Cyst

Author

Yamataka, Atsuyuki, Cazares, Joel, Koga, Hiroyuki, Lumley, J.S.P., Series Editor, Howe, James R., Series Editor, Puri, Prem, editor, and Höllwarth, Michael E., editor

Published
2019
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