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Dive into the research topics where Yayoi Nishi is active.

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Featured researches published by Yayoi Nishi.


Journal of Obstetrics and Gynaecology Research | 2000

B-Cell-Type Malignant Lymphoma with Placental Involvement

Yayoi Nishi; Shunji Suzuki; Yasuo Otsubo; Gen Ishikawa; Masao Ichikawa; Rintaro Takei; Rintaro Sawa; Koichi Yoneyama; Yoshio Yoneyama; Tsutomu Araki

We present here a case of B‐cell‐type mediastinal malignant lymphoma during pregnancy complicated by placental involvement. In this case, some nodular high‐echo patterns were recognized in the placenta by ultrasonography. A cesarean section and resection of the mediastinal tumor were performed at 33 weeks and 6 days of gestation due to the deterioration of the dyspnea. A female infant weighing 1,868 g was delivered and she is now a healthy 2‐year‐old. The mother, however, died of the disease 1 month after surgery, due to progression of the tumor. The placenta showed numerous white firm nodules varying from 3 mm to 3 cm in diameter. The pathologic findings of both the mediastinal tumor and the placenta indicated primary mediastinal (thymic) B‐cell lymphoma.


Fertility and Sterility | 2010

A new evaluation score that uses salpingoscopy to reflect fallopian tube function in infertile women

Koji Nakagawa; Masato Inoue; Yayoi Nishi; Rie Sugiyama; Koji Motoyama; Yasushi Kuribayashi; Shigeo Akira; Rikikazu Sugiyama

OBJECTIVE To build an evaluation scoring system using the results of salpingoscopy, and to evaluate the relationship between this scoring system and the outcome of pregnancy. DESIGN Retrospective study. SETTING Sugiyama Clinic. INTERVENTION(S) Using salpingoscopy, we observed the tubal lumen, paying attention to the following six results: adhesions, loss of mucosal folds, rounded edges of mucosal folds, debris, foreign bodies, and abnormal vessels. PATIENT(S) From April 2008 through June 2009, 104 women in whom unexplained infertility had been diagnosed underwent salpingoscopy. The F scores were evaluated related with various clinical results or pregnancy rates. MAIN OUTCOME MEASURE(S) The F score expressed the sum of the abnormal results, and one abnormal result was given a 1-point F score. RESULTS Approximately 60% of the patients showed an F score of 0, and the percentages of patients who showed 1, 2, 3, and ≥4 points were 19.2%, 11.5%, 4.5%, and 4.5%, respectively. After evaluation, 23 patients achieved pregnancy within a year. The pregnancy rates for patients with F scores of 0 and 1 point were 30.6% and 20.0%, respectively, and the rate of patients with an F score of 0 was significantly higher than the rate of patients with high F scores (F score ≥2; 9.1%). CONCLUSION(S) The patients showing a lower F score (0 or 1) showed higher fecundity than those showing an F score of ≥2.


Journal of Obstetrics and Gynaecology Research | 2014

Prostaglandin therapy during the proliferative phase improves pregnancy rates following frozen embryo transfer in a hormone replacement cycle

Koji Nakagawa; Yuko Ojiro; Hiroyasu Jyuen; Yayoi Nishi; Rie Sugiyama; Yasushi Kuribayashi; Rikikazu Sugiyama

To determine the efficacy of prostaglandin administration during the proliferative phase in order to improve pregnancy rates following frozen embryo transfer during a hormone replacement cycle (HRC).


Journal of Obstetrics and Gynaecology Research | 2006

Effect of sera on the adhesion of natural killer cells to the endothelium in severe pre‐eclampsia

Jun Wei; Misao Satomi; Yasuyuki Negishi; Yoshikatsu Matsumura; Atsushi Miura; Yayoi Nishi; Hirobumi Asakura; Toshiyuki Takeshita

Objective:  To investigate the effect of serum on the interaction between natural killer (NK) cells and endothelial cells in pre‐eclampsia.


Journal of Obstetrics and Gynaecology Research | 2010

Elective single cleavage-stage embryo transfer need not result in lower pregnancy rates compared to double cleavage-stage embryo transfer

Koji Nakagawa; Yayoi Nishi; Rie Sugiyama; Yasushi Kuribayashi; Rikikazu Sugiyama; Masato Inoue

Aim:  To confirm whether women who choose to have one fresh embryo transferred and one frozen‐and‐thawed embryo when needed can dramatically reduce the possibility of a multifetal pregnancy while giving themselves a better chance of achieving pregnancy.


Journal of Obstetrics and Gynaecology Research | 2013

Role of salpingoscopy in assessing the inner fallopian tubes of infertility patients with ovarian endometriomas

Koji Nakagawa; Yayoi Nishi; Rie Sugiyama; Yasushi Kuribayashi; Shigeo Akira; Rikikazu Sugiyama; Masto Inoue

The aim of this study was to observe the insides of the fallopian tubes of patients with unilateral or bilateral endometriomas by using salpingoscopy and evaluate the inner cavity of the fallopian tubes according to our original scoring system.


Journal of Nippon Medical School | 2003

Change of the mitochondrial distribution in mouse ooplasm during in vitro maturation.

Yayoi Nishi; Toshiyuki Takeshita; Kahei Sato; Tsutomu Araki


Journal of Assisted Reproduction and Genetics | 2012

Hyaluronan-enriched transfer medium improves outcome in patients with multiple embryo transfer failures.

Koji Nakagawa; Chie Takahashi; Yayoi Nishi; Hiroyasu Jyuen; Rie Sugiyama; Yasushi Kuribayashi; Rikikazu Sugiyama


Reproductive Medicine and Biology | 2012

A programmed schedule of oocyte retrieval using mild ovarian stimulation (clomiphene citrate and recombinant follicle-stimulating hormone)

Koji Nakagawa; Yayoi Nishi; Rie Sugiyama; Hiroyasu Jyuen; Chie Takahashi; Yuko Ojiro; Yasushi Kuribayashi; Rikikazu Sugiyama


Journal of Nippon Medical School | 2005

Gasless laparoscopic surgery using a new intra-abdominal fan retractor system: an experience of 500 cases.

Shigeo Akira; Takashi Abe; Kenji Igarashi; Yayoi Nishi; Keisuke Kurose; Michiaki Watanabe; Toshiyuki Takeshita

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Rie Sugiyama

Tokyo Medical University

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Hiroshi Motoyama

Jikei University School of Medicine

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Chie Takahashi

Tokyo Medical University

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