Ryo Yamamoto

ORCID: 0000-0002-0835-3324
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About
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Research Areas
  • Assisted Reproductive Technology and Twin Pregnancy
  • Pregnancy and preeclampsia studies
  • Prenatal Screening and Diagnostics
  • Congenital Diaphragmatic Hernia Studies
  • Birth, Development, and Health
  • Ectopic Pregnancy Diagnosis and Management
  • Cardiovascular Issues in Pregnancy
  • Preterm Birth and Chorioamnionitis
  • Congenital Anomalies and Fetal Surgery
  • Neonatal Respiratory Health Research
  • Maternal and Perinatal Health Interventions
  • Urological Disorders and Treatments
  • Winter Sports Injuries and Performance
  • Pregnancy-related medical research
  • Maternal and fetal healthcare
  • Gestational Diabetes Research and Management
  • Sports Performance and Training
  • Parvovirus B19 Infection Studies
  • Reproductive tract infections research
  • Microfluidic and Capillary Electrophoresis Applications
  • Advanced Machining and Optimization Techniques
  • Advanced Measurement and Detection Methods
  • Electrowetting and Microfluidic Technologies
  • Blood groups and transfusion
  • Iterative Learning Control Systems

Osaka Women's and Children's Hospital
2018-2025

Kagawa University
2023-2024

Osaka Medical Center for Cancer and Cardiovascular Diseases
2012-2023

Tenri Hospital
2021-2023

Waseda University
2011-2021

Saitama Medical University
2016-2021

Social Insurance Saitama Chuo Hospital
2016-2021

Tokyo Institute of Technology
1999-2019

Kōchi University
2019

Centre for Biomedical Network Research on Rare Diseases
2014-2015

Preterm premature rupture of membranes (PPROM) is associated with preterm delivery and neonatal complications. PPROM often complicated by intra-amniotic inflammation and/or microbial invasion the amniotic cavity Ureaplasma or Mycoplasma . Various prophylactic antibiotic therapies have been proposed to prolong latency between delivery, reduce risk clinical chorioamnionitis, improve However, information on potential azithromycin administration load vaginal remains lacking. This prospective...

10.1371/journal.pone.0306958 article EN cc-by PLoS ONE 2025-02-18

Abstract Aim The prognosis for non‐immune hydrops fetalis (NIHF) is still poor despite progress in perinatal care. We have examined and 1‐year outcomes NIHF relation to gestational age at diagnosis underlying etiology order identify predictors of mortality. Methods A retrospective review was conducted 92 pregnancies with managed hospital between 2000 2012. diagnosis, etiology, outcome, outcome were recorded, their associations assessed. Results total 41 cases (45%) resulted fetal death, 33...

10.1111/jog.12922 article EN Journal of Obstetrics and Gynaecology Research 2015-12-29

The objective of this study was to evaluate the significance maternal toxoplasmosis, rubella, cytomegalovirus (CMV) and herpes simplex virus (TORCH) screening in cases fetal growth restriction (FGR).The medical records women carrying fetuses with FGR who underwent TORCH over a 10-year period were retrospectively reviewed for congenital infection. Women routinely serologic tests systematic ultrasound evaluation abnormalities. If CMV infection suspected, amniotic fluid, placenta or neonatal...

10.1111/j.1447-0756.2012.02012.x article EN Journal of Obstetrics and Gynaecology Research 2012-10-29

Abstract Aim To clarify perinatal outcomes of monoamniotic ( MM ) twin pregnancies. Material and Methods twins delivered in seven tertiary centers during the last decade were retrospectively evaluated. All pregnant women scheduled to begin inpatient management at around 24 weeks gestation undergo a planned cesarean section beyond 32 weeks. Pregnancy outcomes, prevalence fetal death cord entanglement, mortality neuromorbidity rate discharge examined. Results The study group comprised 38...

10.1111/jog.12014 article EN Journal of Obstetrics and Gynaecology Research 2013-03-20

The pulmonary function test (PFT) has played an essential role in diagnosing and managing interstitial lung disease (ILD) but its contraindications difficult conditions to perform. Therefore, the present study aimed evaluate dynamic chest radiography (DCR) ability predict forced vital capacity (FVC) other PFT parameters of ILD patients.The prospective observational included 97 patients who underwent DCR at Tenri Hospital (Tenri, Japan) between June 2019 April 2020. Twenty-five with stable...

10.1016/j.ejrad.2021.109866 article EN cc-by European Journal of Radiology 2021-07-22

Abstract Yanaoka, T, Hamada, Y, Kashiwabara, K, Kurata, Yamamoto, R, Miyashita, M, and Hirose, N. Very-short-duration, low-intensity half-time re–warm up increases subsequent intermittent sprint performance. J Strength Cond Res 32(11): 3258–3266, 2018—This study investigated the effect of very-short-duration, (RW) on Using a randomized cross-over design, 11 healthy men performed 3 trials. In experimental trials, participants first 40-minute exercise followed by 15-minute half-time. The...

10.1519/jsc.0000000000002781 article EN cc-by-nc-nd The Journal of Strength and Conditioning Research 2018-09-08

Lumbar epidural analgesia (LEA) is the most widely used method in reducing labor pain. Previous RCTs have shown that LEA does not increase cesarean section rates; however, results are inconsistent and may vary depending on different backgrounds. Therefore, we aimed to study whether would affect course of our institute.Delivery records from October 2013 April 2016 were collected. Deliveries at gestational age < 36 weeks multiple pregnancies excluded. All cases divided into non-epidural (NEL)...

10.1186/s40981-019-0260-z article EN cc-by JA Clinical Reports 2019-06-18

Objective: To identify the clinical features and risk factors for diagnosis of a postpartum-onset hypertensive disorder. Methods: A retrospective cohort study singleton pregnancies. Clinical disorders were evaluated, prenatal also identified with multivariate logistic regression model. Results: Of 1,964 women, 57 (2.9%) developed disorder after delivery. The independent assisted reproductive technology, pre-pregnancy body mass index, chronic nephritis, hypothyroidism, high-normal blood...

10.3109/10641955.2015.1100308 article EN Hypertension in Pregnancy 2016-01-02

To evaluate neonatal outcomes and clinical characteristics of monochorionic diamniotic (MCDA) twins with a large intertwin hemoglobin (Hb) difference at birth.This was retrospective cohort study MCDA twin gestations delivered Osaka Medical Center Research Institute for Maternal Child Health between 2003 2012. Cases pregnancy termination, acardiac or intrauterine death were excluded. A Hb birth defined as > 8.0 g/dL according to the postnatal criteria anemia-polycythemia sequence (TAPS). The...

10.1002/uog.13343 article EN Ultrasound in Obstetrics and Gynecology 2014-02-24

To evaluate mitral and tricuspid annular plane systolic excursion (MAPSE TAPSE) in fetuses with twin-to-twin transfusion syndrome (TTTS) before after laser therapy.A prospective study 24 fetal pairs TTTS evaluated h within 48 fetoscopy 13 gestational age-matched normal monochorionic pairs. MAPSE TAPSE were measured an apical or basal four-chamber view by placing the M-mode cursor at lateral valve ring.Mean preoperative (controls 3.6 ± 1.3 mm vs. donors 2.7 0.8 recipients 2.8 0.9; P < 0.001)...

10.1002/pd.4671 article EN Prenatal Diagnosis 2015-08-08

Hypertensive disorders in pregnancy are major causes of maternal mortality and morbidity. Although the combined risk assessments history, blood pressure, uterine artery Doppler, serum marker seem to be highly predictive development hypertensive disorders, this method is a little complicated performed on many low-risk pregnant women. The aim study evaluate use characteristics, physical findings early second trimester, as factors disorders. This retrospective cohort undertaken single tertiary...

10.1016/j.tjog.2016.04.009 article EN cc-by-nc-nd Taiwanese Journal of Obstetrics and Gynecology 2016-06-01

To investigate the incidence of complications associated with cervical cerclage by indication.This was a retrospective cohort study women singleton pregnancies who underwent in single perinatal center between 2008 and 2019. The participants were divided into three groups according to indication: history-indicated (HIC) group, ultrasound-indicated (UIC) physical examination-indicated (PEIC) group. incidences perioperative within 2 weeks after procedure, including intraoperative rupture...

10.1111/jog.15091 article EN Journal of Obstetrics and Gynaecology Research 2021-11-02

We report a case of twin anemia-polycythemia sequence (TAPS) treated by fetoscopic laser equatorial placental dichorionization, also known as the ‘Solomon technique', at 24 weeks gestation. TAPS was present despite absence fetoscopically visualized chorionic anastomoses from donor to recipient twin. The goal this procedure prevent post-laser in cases twin-twin transfusion syndrome. surgery and subsequent intrauterine blood could result survival both twins without hematologic or neurological...

10.1159/000354985 article EN Fetal Diagnosis and Therapy 2013-09-14

Objective: The aim of this study was to determine the predictive value high-normal blood pressure (HNBP) during early second trimester for hypertensive disorders in pregnancy, including gestational hypertension (GH) and preeclampsia (PE). Methods: This a retrospective single-center cohort 2143 singleton pregnant women. association HNBP, ranging from 130/85 139/89 mmHg between 14 19 weeks gestation, with development assessed by multivariable logistic regression analyses. Results: In 2102...

10.3109/10641955.2016.1139719 article EN Hypertension in Pregnancy 2016-03-03

Although immediate pre-meal water ingestion has been shown to reduce energy intake in healthy young men, no studies are available regarding potential mechanisms underlying the effect of response different temperatures ingestion. This study examined effects consuming on gastric motility and men. Eleven men were completed three, 1-day trials a random order. Subjects visited laboratory after 10-h overnight fast consumed 500 mL at 2 °C, 37 or 60 °C 5 min. Then, subjects sat chair over 1 h...

10.1007/s00394-018-1888-6 article EN cc-by European Journal of Nutrition 2019-01-07

To elucidate the impact of intended delivery mode on long-term outcomes among extremely preterm infants.Women who delivered singletons between 23 0/7 and 25 6/7 weeks gestation from January 2010 to March 2014 their infants were included in this study. The cases fetal growth restriction those with a chromosomal or major structural abnormality excluded. death that was diagnosed before labor onset non-reassuring status, placental abruptions umbilical cord prolapse at also primary outcome...

10.1016/j.tjog.2022.02.020 article EN cc-by-nc-nd Taiwanese Journal of Obstetrics and Gynecology 2022-03-01

The appropriate effectiveness of inter-twin amniotic fluid discordance (AFD) in the early second trimester for prediction severe twin-twin transfusion syndrome (TTTS) was evaluated.The largest AFD between 16 and 18 weeks' gestation analyzed correlation with TTTS development defined by polyhydramnios a maximum vertical pocket (MVP) ≥8 cm combined oligohydramnios MVP ≤2 using receiver operating characteristics curve. All pregnancies were stratified according to an cutoff, perinatal outcomes...

10.1159/000348771 article EN Fetal Diagnosis and Therapy 2013-01-01

Abstract This study investigated the effect of high‐intensity cycling re‐warm up (RW) within a very short time‐frame on subsequent intermittent sprint performance. Twelve active males completed three trials in random order: control (CON); 3‐min RW at 30% maximal oxygen uptake (VO 2max ) (RW30); and 1‐min 90% VO (RW90). During experimental trials, participants performed 40‐min exercise followed by 15‐min rest. rest period, CON, RW30, or RW90. After Cycling Intermittent‐Sprint Protocol (CISP),...

10.1080/17461391.2020.1713901 article EN European Journal of Sport Science 2020-01-08

To evaluate the outcome of monochorionic diamniotic (MCDA) twins complicated by Type-II selective fetal growth restriction (sFGR) who underwent fetoscopic laser photocoagulation and to validate a previously proposed subclassification system for sFGR in large multicenter cohort.

10.1002/uog.26165 article EN Ultrasound in Obstetrics and Gynecology 2023-01-27

Objective Chronic pulmonary aspergillosis (CPA) is an important complication of nontuberculous mycobacterial disease (NTM-PD). However, its diagnosis challenging, as both CPA and NTM-PD present chronic cavitary disease. The study evaluated the impact on survival patients with revealed key computed tomography findings for a prompt diagnosis. Methods We retrospectively reviewed newly diagnosed in Tenri Hospital (Tenri City, Nara Prefecture, Japan) between January 2009 March 2018; were followed...

10.2169/internalmedicine.0836-22 article EN Internal Medicine 2023-03-14

The primary aim of this study was to examine the association between maternal height and mode delivery in nulliparous Japanese women. secondary neonatal morbidities.

10.1111/jog.14511 article EN Journal of Obstetrics and Gynaecology Research 2020-10-01
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