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Dive into the research topics where Yuki Ogasawara is active.

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Featured researches published by Yuki Ogasawara.


Pediatric Surgery International | 2004

Ilio-psoas abscess caused by methicillin-resistant Staphylococcus aureus (MRSA) : a rare but potentially dangerous condition in neonates

Yasuhiro Okada; Atsuyuki Yamataka; Yuki Ogasawara; Keiko Matsubara; Toyoko Watanabe; Geoffrey J. Lane; Takeshi Miyano

We report a case of methicillin-resistant Staphylococcus aureus ilio-psoas abscess (IPA) in a neonate. This case has clinical importance because this neonate had toxic shock syndrome-like exanthematous disease, known as NTED, before developing IPA. A high index of suspicion is required for IPA if a neonate presents with limb disuse and fever of unknown origin. Our case required surgical drainage, since ultrasound-guided percutaneous needle aspiration failed.


Journal of Pediatric Gastroenterology and Nutrition | 2016

Intestinal Microbiota in Pediatric Surgical Cases Administered Bifidobacterium Breve: A Randomized Controlled Trial.

Tadaharu Okazaki; Takashi Asahara; Atsuyuki Yamataka; Yuki Ogasawara; Geoffrey J. Lane; Koji Nomoto; Satoru Nagata; Yuichiro Yamashiro

ABSTRACT The efficacy of perioperative probiotic administration has been reported in adults. We examined the effects of orally administered Bifidobacterium breve strain Yakult (BBG-01) on outcomes in pediatric surgical cases by assessing intestinal and blood microbiota. BBG-01 was well tolerated without adverse effects, and postoperative infectious complications were significantly decreased. Fecal analysis showed increased Bifidobacterium and decreased Enterobacteriaceae, Clostridium difficile, and Pseudomonas. Concentrations of fecal acetic acid were significantly increased, maintaining fecal pH at <7.0. The incidence of detecting bacteria in blood was significantly reduced. BBG-01 improved the intestinal environment, and may be implicated in suppressing bacterial translocation.


Journal of Pediatric Surgery | 2011

Increase in fetal pulmonary artery diameters during late gestation is a predictor of outcome in congenital diaphragmatic hernia with liver herniation

Tadaharu Okazaki; Nana Nakazawa; Yuki Ogasawara; Hiromichi Shoji; Toshiaki Shimizu; Shintaro Makino; Satoru Takeda; Geoffrey J. Lane; Atsuyuki Yamataka

AIM Liver herniation (LH) in congenital diaphragmatic hernia (CDH) may not be a reliable prognostic indicator. We measured pulmonary artery (PA) diameters in CDH + LH as an alternative. METHODS Of 41 consecutive cases of prenatally diagnosed left-sided CDH treated from 2002 to 2010, 19 had CDH + LH and 22 had CDH - LH. Ultrasonography and magnetic resonance imaging were used to assess LH and echocardiography to measure PA diameters during the third trimester (fetal; 32-34 weeks), at birth, and on day 2 of life. RESULTS In CDH + LH survivors (9/19; 47%), fetal right PA (RPA) diameters were significantly larger than in nonsurvivors (2.58 ± 0.56 vs 1.82 ± 0.35 mm; P < .01), but left PA (LPA) diameters were not (1.73 ± 0.38 vs 1.59 ± 0.22). In survivors, fetal RPA was greater than 2 mm in all but one case, and both PA diameters increased significantly by birth (RPA, 2.58 ± 0.56 vs 3.52 ± 0.54; LPA, 1.73 ± 0.38 vs 2.60 ± 0.40; both P < .01). Final diameters at birth in survivors were at least 2.5 and 2.0 mm, respectively. In nonsurvivors, both PAs were significantly smaller (RPA, 3.52 ± 0.54 vs 2.04 ± 0.31; LPA, 2.60 ± 0.40 vs 1.68 ± 0.18; P < .01), with no observed increase by birth. Survival in CDH - LH was 82% (18/22). CONCLUSION PA diameter appears to be correlated with prognosis in infants with CDH + LH.


Journal of Pediatric Surgery | 2017

Incidence of ureterovesical obstruction and Cohen antireflux surgery after Deflux® treatment for vesicoureteric reflux

Manabu Okawada; Hiroshi Murakami; Nana Tanaka; Yuki Ogasawara; Geoffrey J. Lane; Tadaharu Okazaki; Toshihiro Yanai; Masahiko Urao; Atsuyuki Yamataka

AIM The purpose of this study was to determine the incidence of ureteric obstruction (UB) and requirement for Cohen antireflux surgery (CAS) after DefluxⓇ treatment (DT) for vesicoureteric reflux (VUR). METHODS Between 2011 and 2017, 494 ureters (VUR severity ≤ grade III: N=291 or >grade IV: N=203) were treated by DT at a mean age of 4.5 (range: 0.2-24) years. Epidural Catheter Assistance (ECA) was used to exclude UB by injecting diluted indigo carmine solution (1-3mL) into an epidural catheter inserted into a ureter after DT and confirming dye flow within 15min. ECA+: N=181 ureters; ECA-: N=313 ureters. RESULTS In ECA+, UB was detected in 5/181 (2.7%) ureters (grade II: N=1, III: N=3, and IV: N=1) treated by leaving the ECA catheter in situ overnight (N=4) or double J stent (DJS) insertion for 1month (N=2). After mean follow-up of 1.9years, one grade III DJS case has residual grade II VUR. In ECA-, 3/313 (0.9%) cases developed UB. One resolved, and one required DJS. CAS was required for 17/494 (3.4%) ureters and hindered by DT in 5/17 (29.4%) ureters. All are sequelae-free after mean follow-up of 1.8years. CONCLUSIONS UB may be more frequent than reported (3.3% versus 0.6%-1.8%). ECA identifies potential UB. TYPE OF STUDY Treatment study. LEVEL OF EVIDENCE Level III.


Pediatric Surgery International | 2014

A case of congenital diaphragmatic hernia with intradiaphragmatic pulmonary sequestration: case report and literature review

Soichi Shibuya; Yuki Ogasawara; Hiroshi Izumi; Masato Kantake; Kaoru Obinata; Koyo Yoshida; Geoffrey J. Lane; Atsuyuki Yamataka; Tadaharu Okazaki

Extralobar pulmonary sequestration (EPS) can occasionally be found incidentally in congenital diaphragmatic hernia (CDH). Extralobar pulmonary sequestration usually arises in the chest or the abdomen; rarely in the diaphragm. We report a neonatal case of antenatally diagnosed CDH associated with intradiaphragmatic EPS.


Journal of Pediatric Surgery | 2003

The intussusception antireflux valve is ineffective for preventing cholangitis in biliary atresia: a prospective study

Yuki Ogasawara; Atsuyuki Yamataka; Kanako Tsukamoto; Yasuhiro Okada; Geoffrey J. Lane; Hiroyuki Kobayashi; Takeshi Miyano


Pediatric Surgery International | 2013

Surgical intervention for congenital diaphragmatic hernia: open versus thoracoscopic surgery

Takaaki Tanaka; Tadaharu Okazaki; Yumi Fukatsu; Manabu Okawada; Hiroyuki Koga; Go Miyano; Yuki Ogasawara; Geoffrey J. Lane; Atsuyuki Yamataka


Pediatric Surgery International | 2009

Spontaneous sutureless closure of the abdominal wall defect in gastroschisis using a commercial wound retractor system

Yuki Ogasawara; Tadaharu Okazaki; Yoshifumi Kato; Geoffrey J. Lane; Atsuyuki Yamataka


Pediatric Surgery International | 2006

Reduction of intussusception in infants by a pediatric surgical team : improvement in safety and outcome

Tadaharu Okazaki; Yuki Ogasawara; Nana Nakazawa; Hiroyuki Kobayashi; Yoshifumi Kato; Geoffrey J. Lane; Atsuyuki Yamataka; Takeshi Miyano


Pediatric Surgery International | 2009

Radiographic signs predictive of success of hydrostatic reduction of intussusception

Toshiaki Takahashi; Tadaharu Okazaki; Hiroko Watayo; Yuki Ogasawara; Nana Nakazawa; Yoshifumi Kato; Geoffrey J. Lane; Atsuyuki Yamataka

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Hiroyuki Kobayashi

Japanese Ministry of Health

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