Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Ryan G. Steward is active.

Publication


Featured researches published by Ryan G. Steward.


Fertility and Sterility | 2016

Pregnancy outcomes decline with increasing body mass index: analysis of 239,127 fresh autologous in vitro fertilization cycles from the 2008-2010 Society for Assisted Reproductive Technology registry.

Meredith P. Provost; Kelly S. Acharya; Chaitanya R. Acharya; Jason S. Yeh; Ryan G. Steward; Jennifer L. Eaton; James M. Goldfarb; Suheil J. Muasher

OBJECTIVE To examine the effect of body mass index (BMI) on IVF outcomes in fresh autologous cycles. DESIGN Retrospective cohort study. SETTING Not applicable. PATIENT(S) A total of 239,127 fresh IVF cycles from the 2008-2010 Society for Assisted Reproductive Technology registry were stratified into cohorts based on World Health Organization BMI guidelines. Cycles reporting normal BMI (18.5-24.9 kg/m(2)) were used as the reference group (REF). Subanalyses were performed on cycles reporting purely polycystic ovary syndrome (PCOS)-related infertility and those with purely male-factor infertility (34,137 and 89,354 cycles, respectively). INTERVENTION(S) None. MAIN OUTCOME MEASURE(S) Implantation rate, clinical pregnancy rate, pregnancy loss rate, and live birth rate. RESULT(S) Success rates and adjusted odds ratios (ORs) with 95% confidence intervals (CIs) for all pregnancy outcomes were most favorable in cohorts with low and normal BMIs and progressively worsened as BMI increased. Obesity also had a negative impact on IVF outcomes in cycles performed for PCOS and male-factor infertility, although it did not always reach statistical significance. CONCLUSION(S) Success rates in fresh autologous cycles, including those done for specifically PCOS or male-factor infertility, are highest in those with low and normal BMIs. Furthermore, there is a progressive and statistically significant worsening of outcomes in groups with higher BMIs. More research is needed to determine the causes and extent of the influence of BMI on IVF success rates in other patient populations.


Fertility and Sterility | 2016

Pregnancy outcomes decline with increasing recipient body mass index: an analysis of 22,317 fresh donor/recipient cycles from the 2008–2010 Society for Assisted Reproductive Technology Clinic Outcome Reporting System registry

Meredith P. Provost; Kelly S. Acharya; Chaitanya R. Acharya; Jason S. Yeh; Ryan G. Steward; Jennifer L. Eaton; James M. Goldfarb; Suheil J. Muasher

OBJECTIVE To examine the effect of recipient body mass index (BMI) on IVF outcomes in fresh donor oocyte cycles. DESIGN Retrospective cohort study. SETTING Not applicable. PATIENT(S) A total of 22,317 donor oocyte cycles from the 2008-2010 Society for Assisted Reproductive Technology Clinic Outcome Reporting System registry were stratified into cohorts based on World Health Organization BMI guidelines. Cycles reporting normal recipient BMI (18.5-24.9) were used as the reference group. INTERVENTION(S) None. MAIN OUTCOME MEASURE(S) Implantation rate, clinical pregnancy rate (PR), pregnancy loss rate, live birth rate. RESULT(S) Success rates and adjusted odds ratios with 95% confidence intervals for all pregnancy outcomes were most favorable in cohorts of recipients with low and normal BMI, but progressively worsened as BMI increased. CONCLUSION(S) Success rates in recipient cycles are highest in those with low and normal BMI. Furthermore, there is a progressive and statistically significant worsening of outcomes in groups with higher BMI with respect to clinical pregnancy and live birth rate.


Fertility and Sterility | 2013

Pregnancy outcomes decline in recipients over age 44: an analysis of 27,959 fresh donor oocyte in vitro fertilization cycles from the Society for Assisted Reproductive Technology.

Jason S. Yeh; Ryan G. Steward; Annie M. Dude; Anish A. Shah; James M. Goldfarb; Suheil J. Muasher

OBJECTIVE To use a large and recent national registry to provide an updated report on the effect of recipient age on the outcome of donor oocyte in vitro fertilization (IVF) cycles. DESIGN Retrospective cohort study. SETTING United States national registry for assisted reproductive technology. PATIENT(S) Recipients of donor oocyte treatment cycles between 2008 and 2010, with cycles segregated into five age cohorts: ≤34, 35 to 39, 40 to 44, 45 to 49, and ≥50 years. INTERVENTION(S) None. MAIN OUTCOME MEASURE(S) Implantation, clinical pregnancy, live-birth, and miscarriage rates. RESULT(S) In donor oocyte IVF cycles, all age cohorts ≤39 years had similar rates of implantation, clinical pregnancy, and live birth when compared with the 40- to 44-year-old reference group. Patients in the two oldest age groups (45 to 49, ≥50 years) experienced statistically significantly lower rates of implantation, clinical pregnancy, and live birth compared with the reference group. Additionally, all outcomes in the ≥50-year-old group were statistically significantly worse than the 45- to 49-year-old group, demonstrating progressive decline with advancing age. CONCLUSION(S) Recent national registry data suggest that donor oocyte recipients have stable rates of pregnancy outcomes before age 45, after which there is a small but steady and significant decline.


Fertility and Sterility | 2015

Ectopic pregnancy rate increases with the number of retrieved oocytes in autologous in vitro fertilization with non-tubal infertility but not donor/recipient cycles: an analysis of 109,140 clinical pregnancies from the Society for Assisted Reproductive Technology registry

Kelly S. Acharya; Chaitanya R. Acharya; Meredith P. Provost; Jason S. Yeh; Ryan G. Steward; Jennifer L. Eaton; Suheil J. Muasher

OBJECTIVE To study the impact of controlled ovarian stimulation on ectopic pregnancy (EP) rate as a function of the number of oocytes retrieved, using donor IVF cycles as a control. DESIGN Retrospective cohort study using a large national database. SETTING Not applicable. PATIENT(S) Data from 109,140 cycles from the 2008-2010 SART registry, including 91,504 autologous cycles and 17,636 donor cycles in patients with non-tubal infertility. INTERVENTION(S) Varying amounts of oocytes retrieved in autologous and donor IVF. MAIN OUTCOME MEASURE(S) Ectopic pregnancy rates. RESULT(S) In autologous cycles, the EP rate significantly increased as oocyte yield increased. This association was not found in oocyte recipients. CONCLUSION(S) In autologous IVF cycles, increasing oocyte yield is correlated with a significantly increased EP rate. This association is not found in oocyte recipients, indicating that the increased EP rate may be due to the supraphysiologic hormone levels achieved with controlled ovarian hyperstimulation.


Contraception | 2016

The impact of short-term depot-medroxyprogesterone acetate treatment on resting metabolic rate.

Ryan G. Steward; Lori A. Bateman; Cris A. Slentz; Frank Z. Stanczyk; Thomas M. Price

OBJECTIVE This study examines the effect of a progestogen (depot-medroxyprogesterone acetate, DMPA) on resting metabolic rate (RMR) in a cohort of young, normal-weight healthy women. We hypothesize an increase in RMR and nonshivering thermogenesis (NST) resulting in increased body temperature by DMPA. STUDY DESIGN We performed a prospective cohort study in 13 subjects tested at baseline, 3 weeks and 9 weeks after 150 mg intramuscular DMPA administration. RMR was determined with indirect calorimetry. Secondary endpoints included changes in body mass index (BMI), body composition, temperature and serum levels of estradiol (E2), luteinizing hormone (LH), progesterone and MPA. RESULTS The percent change in RMR from baseline to week 3 (9%) was significantly higher than the percent change from baseline to week 9 (1.6%) (p=.045). The greatest percent change from baseline to week 3 compared to baseline to week 9 was seen in women initiating DMPA in the luteal phase of the cycle. Hypothalamic-pituitary-ovarian axis was evident by decreases in E2, LH and progesterone. DMPA resulted in increased body temperature with a significant correlation between the change in body temperature and the change in RMR. No change in body composition was seen. CONCLUSIONS RMR and NST increased in young healthy women with normal BMI 3 weeks after receiving the initial dose of 150 mg DMPA for contraception. The effect was augmented when the drug was administered during the luteal phase of the menstrual cycle. IMPLICATION DMPA increases RMR and thermogenesis independent of changes in body mass. An increase in weight with chronic DMPA may result from a combination of hyperphagia and abnormal NST in predisposed individuals.


Obstetrical & Gynecological Survey | 2012

Management of gynecologic surgery in the patient with factor XI deficiency: a review of the literature.

Ryan G. Steward; Oussama A. Saleh; Andra H. James; Anish A. Shah; Thomas M Price

&NA; Factor XI deficiency is a rare bleeding disorder that is more commonly found in Ashkenazi Jews. Bleeding manifestations of this disorder are varied and poorly correlate with factor XI levels. Spontaneous bleeding is uncommon, whereas delayed postoperative bleeding is often the presentation of factor XI deficiency. To date, there are no standard recommendations for prophylactic treatment in women undergoing gynecologic surgery. Here, we review published cases of gynecological surgery in women with factor XI deficiency and discuss the risks and benefits of various therapeutic options. Target Audience: Obstetricians And Gynecologists. Learning Objectives: After participating in this activity, physicians should be better able to identify the pathophysiology of factor XI deficiency. Compare previous outcomes of prophylactic treatment in patients with factor XI deficiency undergoing gynecological surgery. Implement possible prophylactic therapies for patients with factor XI deficiency undergoing gynecological surgery.


Haemophilia | 2013

Successful prophylactic regimens for transvaginal oocyte retrieval in women with bleeding diatheses

M. Peavey; Ryan G. Steward; K. Paulyson-Nunez; Andra H. James

M. PEAVEY,* R . STEWARD,† K. PAULYSON-NUNEZ* and A . JAMES‡ *Department of Obstetrics, Gynecology and Medicine, Duke University, Durham, NC, USA; †Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Duke University Medical Center, Durham, NC, USA; and ‡Department of Obstetrics and Gynecology, University of Virginia Medical Center, Charlottesville, VA, USA


Fertility and Sterility | 2014

Oocyte number as a predictor for ovarian hyperstimulation syndrome and live birth: an analysis of 256,381 in vitro fertilization cycles

Ryan G. Steward; Lan Lan; Anish A. Shah; Jason S. Yeh; Thomas M Price; James M. Goldfarb; Suheil J. Muasher


Fertility and Sterility | 2014

Pregnancy rates in donor oocyte cycles compared to similar autologous in vitro fertilization cycles: an analysis of 26,457 fresh cycles from the Society for Assisted Reproductive Technology

Jason S. Yeh; Ryan G. Steward; Annie M. Dude; Anish A. Shah; James M. Goldfarb; Suheil J. Muasher


Journal of Reproductive Medicine | 2015

High Peak Estradiol Predicts Higher Miscarriage and Lower Live Birth Rates in High Responders Triggered with a GnRH Agonist in IVF/ICSI Cycles.

Ryan G. Steward; Zhang Ce; Anish A. Shah; Jason S. Yeh; C. Chen; Yi-Ju Li; Thomas M Price; Suheil J. Muasher

Collaboration


Dive into the Ryan G. Steward's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

James M. Goldfarb

Case Western Reserve University

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Researchain Logo
Decentralizing Knowledge