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Dive into the research topics where Andrew S. Blazar is active.

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Featured researches published by Andrew S. Blazar.


Fertility and Sterility | 1997

Day 3 serum inhibin-B is predictive of assisted reproductive technologies outcome

David B. Seifer; Geralyn Lambert-Messerlian; Joseph W. Hogan; Alice C. Gardiner; Andrew S. Blazar; Carol A. Berk

OBJECTIVE To determine if women with day 3 serum inhibin-B concentrations < 45 pg/mL (conversion factor to SI unit, 1.00) demonstrate a poorer response to ovulation induction and assisted reproductive technologies outcome relative to women with inhibin-B values > or = 45 pg/mL. DESIGN Analysis of inhibin-B, FSH, and E2 concentrations in day 3 serum samples. SETTING Academic clinical practice. PATIENT(S) One hundred fifty-six women who underwent 178 assisted reproductive technology (ART) cycles with luteal phase GnRH agonist suppression plus hMG and urofollitropin stimulation. MAIN OUTCOME MEASURE(S) Serum E2 on day of hCG, number of oocytes retrieved per patient, fertilization rate, cleavage rate, clinical pregnancy rate (PR) per initiated cycle, cancellation rate per initiated cycle, and spontaneous abortion rate. RESULT(S) Women with day 3 serum inhibin-B < 45 pg/mL demonstrated 70% of the E2 response, had 66.6% of the number of oocytes retrieved per patient, with 28% of the clinical PR per initiated cycle, and three times the cancellation rate per initiated cycle than women with day 3 inhibin-B > or = 45 pg/mL. After controlling for age, day 3 serum FSH, day 3 serum E2, patient cycle number, and method of ART, day 3 serum inhibin-B > or = 45 pg/mL was noted to be prognostic of the number of oocytes retrieved and clinical PR. The adjusted odds ratio of clinical pregnancy for those with day 3 serum inhibin-B > or = 45 pg/mL versus those with inhibin-B < 45 pg/mL was 6.8 (95% confidence interval 1.8 to 25.6). CONCLUSION(S) Women with low day 3 serum inhibin-B concentrations demonstrate a poorer response to ovulation induction and are less likely to conceive a clinical pregnancy through ART relative to women with high day 3 inhibin-B.


Fertility and Sterility | 2011

Age-related normograms of serum antimüllerian hormone levels in a population of infertile women: a multicenter study

Benny Almog; Fady Shehata; Sami Suissa; Hananel Holzer; Einat Shalom-Paz; Antonio La Marca; Shanthi Muttukrishna; Andrew S. Blazar; Richard J. Hackett; Scott M. Nelson; João Sabino Cunha-Filho; Talia Eldar-Geva; Ehud J. Margalioth; Nick Raine-Fenning; K. Jayaprakasan; Myvanwy McIlveen; Dorothea Wunder; Thomas Fréour; Luciano G. Nardo; Juan Balasch; Joana Peñarrubia; J.M.J. Smeenk; Christian Gnoth; Erhard Godehardt; Tsung-Hsien Lee; Maw-Sheng Lee; Ishai Levin; Togas Tulandi

OBJECTIVE To produce age-related normograms for serum antimüllerian hormone (AMH) level in infertile women without polycystic ovaries (non-PCO). DESIGN Retrospective cohort analysis. SETTING Fifteen academic reproductive centers. PATIENT(S) A total of 3,871 infertile women. INTERVENTION(S) Blood sampling for AMH level. MAIN OUTCOME MEASURE(S) Serum AMH levels and correlation between age and different percentiles of AMH. RESULT(S) Age-related normograms for the 3rd, 10th, 25th, 50th, 75th, 90th, and 97th percentiles of AMH were produced. We found that the curves of AMH by age for the 3rd to 50th percentiles fit the model and appearance of linear relation, whereas the curves of >75th percentiles fit cubic relation. There were significant differences in AMH and FSH levels and in antral follicle count (AFC) among women aged 24-33 years, 34-38 years, and ≥39 years. Multivariate stepwise linear regression analysis of FSH, age, AFC, and the type of AMH kit as predictors of AMH level shows that all variables are independently associated with AMH level, in the following order: AFC, FSH, type of AMH kit, and age. CONCLUSION(S) Age-related normograms in non-PCO infertile women for the 3rd to 97th percentiles were produced. These normograms could provide a reference guide for the clinician to consult women with infertility. However, future validation with longitudinal data is still needed.


Fertility and Sterility | 1997

The impact of hydrosalpinx on successful pregnancy in tubal factor infertility treated by in vitro fertilization

Andrew S. Blazar; Joseph W. Hogan; David B. Seifer; Gary N. Frishman; Carol Wheeler; Ray V. Haning

OBJECTIVE To determine the impact of hydrosalpinx on pregnancy rates in patients undergoing IVF for infertility caused by tubal disease. DESIGN Review of the records of all patients who had undergone IVF for tubal factor infertility at our institution between May 1988 and October 1994. SETTING A university-sponsored, hospital-based IVF facility. PATIENT(S) Two hundred fifty patients were identified with infertility due to tubal disease; 67 of these had at least one documented hydrosalpinx whereas the remaining 183 did not. MAIN OUTCOME MEASURE(S) Numbers of oocytes retrieved and fertilized, the number of embryos transferred and implanting, and resulting pregnancy rates. RESULT(S) The groups were similar in age and cycle cancellation rates. The patients with hydrosalpinx had greater numbers of oocytes retrieved per cycle (15.0 versus 11.6) and embryos transferred per cycle then those without hydrosalpinges (4.21 versus 3.98). The hydrosalpinx group also undertook more cycles per patient (2.31 versus 1.96). Fertilization rates between the two groups were similar, but implantation rates were decreased in those with hydrosalpinx (8.5% versus 11.2%). CONCLUSION(S) Hydrosalpinx did not result in impaired ovarian stimulation or decreased oocyte fertilization. It did, however, interfere with implantation and reduce to some degree the success of IVF in achieving an ongoing pregnancy. The validity of routine salpingectomy for hydrosalpinx is debatable, but its use in selected individuals may well be appropriate.


American Journal of Obstetrics and Gynecology | 1965

Obstetric behavior of the grand multipara

S. Leon Israel; Andrew S. Blazar

A retrospective study of 5551 grand multiparas was undertaken to collect statistically valid and clinically comparable information on the risks of pregnancy in this group with parity of 7 or greater. 60% of the women were nonwhite and two-thirds were 34 years or younger. Grand multiparas made up 4.3% of all obstetric patients seen during the 3-year (1958-1960) study in 13 collaborating hopsitals. A hemoglobin of less than 10 gm-percent occurred more than twice as often among grand multiparas; nonwhite women had more anemia than white women but excessive multiparity dramatically heightened the incidence of anemia among white women. Preeclampsia and hypertension occurred significantly (p.001) more often in grand multiparas than in women of lower parity. Abruption and previa of the placenta both occurred significantly (p.001) more often in grand multiparas. Uterine rupture (.28%) postpartum hemorrhage (5.3%) and transfusion required (6%) occurred nearly twice as often in grand multiparas. There was an absolute increase in the occurrence of breech and transverse presentations among grand multiparas and maternal morbidity was 50% greater. Maternal mortality was not increased.


Fertility and Sterility | 2013

Management of the first in vitro fertilization cycle for unexplained infertility: a cost-effectiveness analysis of split in vitro fertilization-intracytoplasmic sperm injection

W. Vitek; Omar Galárraga; P.C. Klatsky; Jared C. Robins; Sandra Ann Carson; Andrew S. Blazar

OBJECTIVE To determine the cost-effectiveness of split IVF-intracytoplasmic sperm injection (ICSI) for the treatment of couples with unexplained infertility. DESIGN Adaptive decision model. SETTING Academic infertility clinic. PATIENT(S) A total of 154 couples undergoing a split IVF-ICSI cycle and a computer-simulated cohort of women <35 years old with unexplained infertility undergoing IVF. INTERVENTION(S) Modeling insemination method in the first IVF cycle as all IVF, split IVF-ICSI, or all ICSI, and adapting treatment based on fertilization outcomes. MAIN OUTCOME MEASURE(S) Live birth rate, incremental cost-effectiveness ratio (ICER). RESULT(S) In a single cycle, all IVF is preferred as the ICER of split IVF-ICSI or all ICSI (


American Journal of Obstetrics and Gynecology | 2011

Use of in-cycle antimüllerian hormone levels to predict cycle outcome

Andrew S. Blazar; Geralyn Lambert-Messerlian; Richard J. Hackett; Stephan Krotz; Sandra Ann Carson; Jared C. Robins

58,766) does not justify the increased live birth rate (3%). If two cycles are needed, split IVF/ICSI is preferred as the increased cumulative live birth rate (3.3%) is gained at an ICER of


Fertility and Sterility | 1980

Differences in Hormonal Patterns During the First Postabortion Menstrual Cycle after Two Techniques of Termination of Pregnancy

Andrew S. Blazar; Jonas Harlin; Arif A. Zaidi; E. Diczfalusy

29,666. CONCLUSION(S) In a single cycle, all IVF was preferred as the increased live birth rate with split IVF-ICSI and all ICSI was not justified by the increased cost per live birth. If two IVF cycles are needed, however, split IVF/ICSI becomes the preferred approach, as a result of the higher cumulative live birth rate compared with all IVF and the lesser cost per live birth compared with all ICSI.


Human Reproduction | 2006

Müllerian inhibiting substance levels at the time of HCG administration in IVF cycles predict both ovarian reserve and embryo morphology

Tali Silberstein; David T. MacLaughlin; Iris Shai; J.R. Trimarchi; G. Lambert-Messerlian; David B. Seifer; David L. Keefe; Andrew S. Blazar

OBJECTIVE The goal of this work is to expand the usefulness of antimüllerian hormone (AMH) in predicting in vitro fertilization cycle outcome by demonstrating that AMH concentration obtained in an ongoing treatment cycle predicts both oocyte number and pregnancy. STUDY DESIGN Serum samples were obtained from 190 in vitro fertilization patients at onset of follicle-stimulating hormone stimulation. These were analyzed retrospectively during a single cycle in which clinicians were blinded to the results. Our major outcome measures were the number of oocytes obtained and ongoing pregnancy. RESULTS Patients with an initial AMH concentration of >3 ng/mL were found to produce a mean of 19.8 oocytes and had an ongoing pregnancy rate of 60.3%. In contrast, those with AMH values of ≤1 ng/mL yielded a mean of 6.2 oocytes and had an ongoing pregnancy rate of 23.4% (P < .0001 for both). CONCLUSION Greater AMH serum concentration strongly predicts an increased number of oocytes and ongoing pregnancy (P ≤ .0001).


Fertility and Sterility | 2000

Hierarchical logistic regression models for clustered binary outcomes in studies of IVF-ET

Joseph W. Hogan; Andrew S. Blazar

Fifteen patients underwent first-trimester abortion by one of two techniques. In group P, seven patients received prostaglandin vaginal suppositories during the 12 hours prior to vacuum aspiration, whereas eight patients in group V were aborted by aspiration alone. During the first postabortion menstrual cycle, daily peripheral blood levels of several hormones, including follicle-stimulating hormone (FSH), luteinizing hormone, human chorionic gonadotropin, estradiol, and progesterone, were determined. Patients in group P demonstrated a more rapid fall in progesterone levels following pregnancy termination (P less than 0.01). They also experienced a more physiologic first postabortion cycle as evidenced by a larger preovulatory estradiol peak (P less than 0.05) and a more normal luteal phase as judged by both the duration and elevation of progesterone levels. Certain endocrine changes common to both groups but different from those of normally menstruating women were also observed. These consisted of short-term spurts of progesterone secretion in many patients (10 of 15) prior to ovulation and exaggerated levels of FSH during the early follicular phase.


Fertility and Sterility | 2004

Serum estradiol positively predicts outcomes in patients undergoing in vitro fertilization.

Andrew S. Blazar; Joseph W. Hogan; David Frankfurter; Richard J. Hackett; David L. Keefe

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Tali Silberstein

Ben-Gurion University of the Negev

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