Comparative analysis of the pregnancy rate via fertilization vs. previous artificial insemination in patients with unexplained infertility.

Objective: To compare the clinical pregnancy rate among patients undergoing direct in vitro fertilization vs. in vitro fertilization after two cycles of intrauterine insemination in couples with unexplained infertility.

Methods: Comparative cross-sectional, retrospective study from 2016 to 2019, from the Centro Mexicano de Fertilidad Doctor Alberto Kably.

Physiological ICSI (PICSI) vs. Conventional ICSI in Couples with Male Factor: A Systematic Review.

Objectives: To determine the efficacy of the physiological ICSI technique (PICSI) vs. conventional ICSI in the prognosis of couples, with respect to the following outcome measures: live births, clinical pregnancy, implantation, embryo quality, fertilization and miscarriage rates.

Methods: A systematic review of the literature, extracting raw data and performing data analysis.

[Assessment of progesterone levels on the day of the hCG administration as a predictor of success of antagonist stimulation protocols for IVF].

Background: There are reports of deleterious effect when progesterone concentration is high during the follicular phase in cycles of in vitro fertilization. In our environment has not carried out a study to evaluate the pregnancy rate compared with progesterone concentration on the day of application of hCG.

Objective: To evaluate the pregnancy rate and outcome of in vitro fertilization cycle according to serum progesterone concentration on the day of application of hCG.

[Effect of sexual abstinence on pregnancy rates after an intrauterine insemination].

Background: There are many studies showing that more days of sexual abstinence increased sperm concentration, however, the direct influence between the days of abstinence and pregnancy rates has not been evaluated. The usual recommendation is 3-4 days prior to intrauterine insemination; this based on the interval that maximizes the number of motile sperm in the ejaculate. There are some reports with better success rate when abstinence is less than three days.

[Unselective single embryo transfer: chances of pregnancy related to operator experience].

Background: Selection of best quality embryo aims to achieve higher success rate, the pregnancy is unique and therefore obstetric risks are reduced.

Objective: To evaluate the pregnancy rate with no transfer of selected single embryo (TSSE) three days versus the experience of the physician performing the embryo transfer.

Patients And Methods: A retrospective, cross-sectional observational study in 159 patients Mexican Fertility Center in CEPAM protocol in vitro fertilization any indication, other ovulatory disorders and who was only possible obtain an embryo to be transferred in three day.

[Assisted hatching following embryo implantation failure].

Background: Assisted hatching in reproduction techniques has improved the successful implantation rates in certain groups of patients with poor prognosis. This study focuses on its effect in groups of patients with previous implantation failure and according to age groups.

Objective: Compare the pregnancy rates of patients who turned to this technique following an implantation failure using in vitro fertilization with those of patients who did not use assisted hatching before another attempt of in vitro fertilization and according to specific age groups.

[Evaluation of two transfer embryo systems performed by six physicians].

Background: Embryo transfer is a critical point for success in IVF cycles. Many factors should be considered when performing an embryo transfer such as: embryo quality and number, soft versus rigid catheter, easy of the transfer, physician technique, ultrasound guide during transfer, among others.

Objective: Evaluate two different embryo transfer systems performed by six physicians with the same protocol.

[Comparative analysis of pregnancy rate/captured oocytes in an in vitro fertilization program].

Background: Since in vitro fertilization/embryo transfer is used as a common assisted reproductive technique there have been attempts to increase its success rate. One way is to obtain more good quality mature ovules to fertilize them, and two to three good quality embryos to transfer.

Objective: To determine if the number of retrieved oocytes is related with the pregnancy rate in IVF-ET.

[Serum estradiol the day of hCG administration as predictor factor of IVF-ET].

Background: Since the beginning of assisted reproductive technologies, they have been in search of a pregnancy predictor, mainly in in vitro fertilization, due to its difficulty and expensiveness.

Objective: To know if there is an optimal estradiol levels to reach pregnancy in patients with in vitro fertilization and embryo transference.

Material And Methods: Retrospective and descriptive study of 179 patients in the fresh in vitro fertilization cycles from January 1 to December 31,2006.

[Impact of spermatozoid head anomalies as predictor factor of non-determined infertility].

Objective: To evaluate fertilization and pregnancy rates, and pregnancy outcome in women diagnosed with non-determined infertility, and its correlation with sperm head morphology anomalies.

Material And Methods: Retrospective study (ANOVA) including 126 patients diagnosed with non-determined infertility, attended from January 2002 to December 2006, admitted to embryo transference fertilization program, both conventional in vitro and intracytoplasmatic sperm injection. Spermatic morphology was analyzed in accordance with Kruger's strict criterion.

[Clinical implication and frequency of the incidental finding of endometriosis during oocyte retrieval].

Background: Endometriosis is a clinical disease that is associated with poor outcomes in in vitro fertilization (IVF) programs with a decrease in oocyte retrieval, oocyte quality, implantation and pregnancy rates. When an endometrioma is diagnosed, it is indicated to remove endometrial cysts by laparoscopy or perform an aspiration before the cycle of IVF.

Objectives: To evaluate the effect of endometriosis diagnosed incidentally during oocyte retrieval on the IVF outcome, as well as to establish its frequency.

[Statistical and prognostic correlation of serum levels of basal inhibin to response and follicular quality in assisted reproduction].

Background: Inhibin B is a direct marker of ovarian reserve and one of the earliest markers of ovarian aging. It has been used in assisted reproduction programs as a serum marker that can identify an altered follicular reserve and predict a good or poor response to the stimulation with exogenous gonadotropins.

Objective: To correlate inhibin B levels with follicular response and quality of oocytes obtained through ovarian stimulation controlled in an in vitro fertilization cycle (IVFET), as well as relate it with variables such as: fertilization percentage and pregnancy rates.

[Usefulness of luteinizant hormone levels to determine the oocyte quality].

Objective: To evaluate the luteinizing hormone serum preovulatory levels and correlate them with the embryo number and quality, and with the fertilization and clavage rates.

Study: Prospective, descriptive and observational.

Material And Methods: We included 286 patients that underwent to IVF-ET program, we excluded patients with no mesurement of LH preovulatory levels, or patients that in the oocyte retrieval we do not found oocytes.

[Intrafollicular levels of sexual steroids and their relation with the antioxidant enzymes on the oocyte quality in an in vitro fertilization program].

Objective: To establish a correlation between intrafollicular superoxide dismutase enzyme concentrations, activity with oestradiol levels, and the effects on oocyte quality and maturity.

Study: Prospective, descriptive and observational.

Material And Methods: Forty-one patients underwent IVF-ET program.

[Value of the morphological characteristics of polar body as a predictive factor of embryo development].

Objective: To determine the relation between polar body quality and perivitelline space with fertilization and segmentation rates and embryo quality.

Study: Prospective and descriptive.

Material And Methods: Sixty-one patients underwent the in vitro fertilization and embryo transfer program (IVF-ET).

[Success' determinant variables in assisted reproduction].

Objective: To perform a statistical analysis with variables that have influence on pregnancy rates to establish a prognostic factor of each one.

Patients And Methods: We performed a retrospective, descriptive, and observational study with 240 patients that underwent to IVF-ET program. The analyzed variables were: infertility factor, ovarian stimulation protocol, age of patients, basal hormonal levels, oestradiol preovulatory levels, endometrial characteristics, fertilization rate, number and quality of oocytes, number and quality of embryos, and difficulty of the embryo transfer.

[Correlation between follicle levels of superoxide dismutase and oocyte quality, fertilization rates and embryo development].

Background: The intraovarian oxidative balance is important during oocyte development, and fertilization. It has been proposed that one of the most important enzymes in the follicle is the superoxide dismutase (SOD).

Objective: To correlate levels and percentage of SOD activity in follicular liquid with quality, fertilization and embryo development in a group of patients submitted to in vitro fertilization.

[Initial values of human chorionic gonadotropin as a prognostic variable of pregnancy evolution in assisted reproduction].

Introduction: In assisted reproduction programs, once a pregnancy has been achieved, the power of predicting its evolution is important for the medical team as well as for the patient. The determination of pregnanediol or of placental protein 14 levels has been postulated as a predictive factor, however, the determination of hCG is, seemingly, the most adequate parameter for the detection of early developmental alterations during pregnancy.

Objective: To determine those predictive values of hCG which establish a prognosis concerning the evolution of pregnancy through the analysis of the values of this hormone on post-transference days 14 and 16, as well as to determine hCG values for multiple pregnancies.

[Azoospermia : In vitro fertilization results, using testicular biopsy and cryopreserved spermatozoa].

Testicular sperm extraction (TESE) by open testicular biopsy, has become, since the introduction of the ICSI in 1992, the corner stone in treatment for azoospermia. This study reports the outcome of patients with open testicular biopsy for ICSI procedure indicated by azoospermia. 16 patients with azoospermia (12 obstructive and 4 non obstructive).

[Statistical correlation between a transference test and embryonic transference in an assisted reproduction program].

Objective: Determining if a statistical correlation can be established between those variables observed during the transference test performed before ovarian stimulation and those obtained during the real embryo transference.

Type Of Study: Clinical retrospective.

Materials And Methods: Ninety four female patients included in the IVF-ET were studied and a transference test previous to ovarian stimulation was performed.

[Fertilization rate analysis as a predictive variable for an in-vitro fertilization program success].

Objective: Determining if fertilization rates can be used as a predictive factor for pregnancy induction in ETIVF-ICSI programs.

Type Of Study: Retrospective, observational and descriptive.

Materials And Methods: Six hundred and seventy nine cycles of the in vitro fertilization program, using long protocol hypophyseal suppression, stop, or antagonsits, were included.

[Unexpected failed fertilization in vitro: ICSI reinsemination or ICSI indication for subsequent cycles].

The objective was to determine if intracytoplasmatic sperm injection (ICSI) for "rescue" of unexpected failed conventional insemination should be carried out for therapeutic or diagnostic purposes, that is, as a predictor for performing ICSI as a standard treatment in subsequent cycles. A retrospective clinical study was carried in 26 patients who showed unexplained fertilization failure on a first conventional IVF attempt, and reinsemination by ICSI was performed. We compared these results with those of 13 of the 26 patients who underwent a second attempt in which ICSI was used as the only insemination technique.

[Changes in mitochondrial membrane potentials and its exponential relation with phosphatidylserine translocation in the plasma membrane as markers in the initial events of apoptosis: evaluation in different spermatic fractions].

Objective: To determine the integrity of the plasmatic membrane through phosphatidylserine (PS) translocation in two spermatic fractions and their correlation with the spermatic mitochondrial membrane potential.

Material And Methods: The analysis of both spermatic fractions was carried out through a discontinuous gradient separation with Percoli, in order to obtain two samples with high and low mobility (90-40%). Twelve patients were recruited for the initial evaluation of seminal parameters.