[Influence of the high peak serum estradiol on the outcome of in vitro fertilization cycles]. / Influencia de las concentraciones séricas de estradiol en el resultado de ciclos de reproducción asistida in vitro.

BACKGROUND: For the use of assisted reproductive technologies of high complexity (IVF-ET and ICSI) is essential to proper ovarian stimulation with recombinant FSH drugs menotropins, as well as the use of GnRH analogues. OBJECTIVE: To correlate serum estradiol level on day 10th with the outcome of in vitro fertilization cycles. MATERIAL AND METHOD: Retrospective study of 523 IVF cycles, selected and analyzed from 2005 to 2009. Patients underwent individualized stimulation protocols with gonadotropins and agonist (late luteal phase). The patients were divided into three groups according with the serum level of estradiol on day 10th of stimulation: Group I, patients with serum level of Estradiol below 1,000 pg/mL; Group II, with levels between 1,000-4,000 pg/mL; and Group III, with levels above 4,000 pg/mL. Peak serum estradiol levels, oocyte number, fertilization rates, implantation rates, and pregnancy rates were compared among groups. RESULTS: The fertilization rate was 62.8 in Group I; 60.6% in Group II, and 54.2% in Group III. The pregnancy rate in Group I was 29.8%; in Group II, 37.3%; and 24% for Group III. The implantation rates were 14, 22 and 14% for each group respectively (I, II and III). CONCLUSIONS: There is an inverse relationship between high peak serum estradiol levels and pregnancy rate; the implantation rate seems affected by the extreme levels of serum estradiol. The percent of total mature oocytes and fertilization rate improve with serum levels of estradiol at physiologic values.

[Endometrial receptivity: numerical classification to successful prognosis in assisted reproduction programs]. / Receptividad endometrial: calificación numérica para el pronóstico de exito en programas de reproducción asistida.

BACKGROUND: Currently, the most precise way of predicting uterine receptivity is the histopathological study through endometrial biopsy. Endometrial morphology and thickness are the factors most strongly associated with better pregnancy rates. OBJECTIVE: To evaluate the prediction value of a numerical grade to predict pregnancy in patients exposed to assisted reproductive techniques. PATIENTS AND METHODS: 22 cycles of in vitro fertilization were made at the Instituto para el Estudio de la Concepción Humana in Monterrey, Nuevo León, from June 2003 to January 2004. We evaluated and categorized: endometrial thickness and morphology, vascularity, miometrial ecogenicity, and uterine artery blood flow (including pulsatility and resistance indexes, presence of protodyastolic nicks, and telediastolic flow). The final numerical grade result from the sum of the individual values obtained for each factor. RESULTS: We included 22 cycles of 20 patients. The general pregnancy and implantation rate was of 40 (8/20) and 26% (17/65) per cycle, respectively. The most common diagnosis was tube occlusion (28%), followed by masculine sex (24%), endometriosis (14%), anovulation (14%), and inexplicable (14%). There were no statistical differences among the pregnant and non-pregnant groups regarding: age, hormonal profile (FSH and estradiol, basal and at the tenth day), total of recombinant FSH unities, follicles > or = 14 mm the day of applying human chorionic gonadotropin, aspired eggs, fertilization index, and transferred embryos. CONCLUSIONS: Endometrial maturity is essential for implantation during an assisted reproductive procedure.

[Intacytoplasmic sperm injection: reproductive reality in couples with sterility]. / Inyección intracitoplasmática de espermatozoides: realidad reproductiva en la pareja con esterilidad.

BACKGROUND: The intacytoplasmic sperm injection (ICSI) is the assisted reproduction technique (ART) that currently offers satisfactory results to infertile couples. The use of epididymal surgical retrieval (percutanean epydidimal sperm aspiration: PESA) and testicular sperm retrieval (testicular sperm extraction: TESE) combined with ICSI has come to bring a high response to azoospermic male. OBJECTIVE: To communicate the results obtained from the Institute for the Study of Human Conception, in Monterrey, NL, with the application of the ICSI technique with ejaculate sperm and in azoospermic patients using sperm obtained from PESAor by testicular sperm extraction TESE. METHODS: From January 1999 to December 2003 1,436 couples were studied at the Institute for the Study of Human Conception, Monterrey, Mexico; 729 cases underwent to ICSI (50.8%), 670 used the ejaculate sperm, in 37 cases (5%) PESA and 22 cases (3%) TESE. These patients were treated as usual: controlled ovarian hyperstimulation (COH) with FSHr alone or combined with HMG or LHr, use of GnRH analogs (agonist o antagonist), follicular monitoring up to the presence of 3 follicles longer than 18 mm; ovular retrieval 34 h after HGC application and embryo transfer in days 3 or 5 of development. RESULTS: No statistically significant difference was noted in the woman's age (p = 0.623), type and time of sterility (p = 0.446, 0.150), neither in FSH, LH and estradiol levels (p = 0.549, 0.623, 0.685). The middle age of the male had significant difference between PESA (38.9 +/- 7.3) and ejaculated sperm (36.1 +/- 6.4) (p = 0-024). The pregnancy rates among groups of the ejaculate sperm, PESA and TESE were 32.8%, 43.2% and 40.9% respectively, without significant difference (p = 0.327), neither in implantation rates: 11.2%, 26% and 11%, respectively (p = 0.153). CONCLUSIONS: The technique of ICSI and use of PESA and TESE offer satisfactory results in infertile couples, including azoospermic male.

[Endometrial thickness. Prognostic factor in assisted reproduction?]. / Grosor endometrial y predicción del embarazo en reproducción asistida.

BACKGROUND: Most authors coincide that an endometrial thickness lesser than 8 mm has a very low pregnancy rate. OBJECTIVE: To determine if the measurement of endometrial thickness by vaginal ultrasound has a prognostic value over the pregnancy rate in patients with endometrial preparation for an embryo transfer in cycles of frozen embryos and ovum donation. STUDY DESIGN: Retrospective and comparative. MATERIAL AND METHODS: A total of 100 cycles were analyzed in the group of frozen embryo transfer; and 71 cycles in the group of ovum donation, we subdivided these two groups into two more groups, one with an endometrial thickness of 8 mm or less and the other with more than 8 mm. RESULTS: There is a significant difference in the group of frozen embryo transfer regarding the age of the patients (p = 0.009). The pregnancy rate in the group of frozen embryo transfer with an endometrial thickness of 8 mm or less was 14.7% and of 37% in the group with more than 8 mm, with a significant difference (p < 0.01). When we analyzed the cycles of ovum donation, we did not found a significant difference, and we found a pregnancy rate of 47% in the group with endometrial thickness of 8 mm or less, and 40% in the other group. CONCLUSION: In the present study we found that the measurement of the endometrial thickness of more than 8 mm in the patient undergoing a frozen embryo transfer has a predictor value.

[Comparison of GnRH agonists and antagonists in an ovular donation program]. / Comparación de agonistas y antagonistas de GnRH en un programa de donación ovular.

INTRODUCTION: GnRH agonists and antagonists are utilized for avoiding premature ovulation in assisted reproductive cycles, (ART) this retrospective study was designed to compare both treatments in controlled ovarian hyperstimulation (HOC) in oocyte donors. MATERIAL AND METHODS: Between Jan99 and Mar03, 141 oocyte donors underwent ART receiving either 0.25 mg daily of a GnRH antagonist (Cetrorelix) from day 6 of stimulation (51 patients) or a long protocol with a GnRH agonist (Leuprolide acetate) (90 patients.) FSHr alone or with HMG or LHr were employed for ovarian stimulation. hCG (Profasi, Serono) was administrated when more than three follicles above 18 mm in diameter were observed, oocyte retrieval was performed 34 hours later. Embryo transfer was performed 3-5 days later. RESULTS: Both groups were homogeneus for age (p=0.142), day 3 FSH (p=0.115), type and total dose of gonadotrophins utilized. There were no significant differences in follicles number (p=0.522), oestradiol levels on the day of hCG (p=0.310) and fertilization rates (p=0.177) The mean number of oocytes retrieved and metaphase II oocytes was significantly lower in GnRH agonist group, (12 vs. 13.9, p=0.05 and 8.6 vs 11; p=0.007) There was no statistical differences in pregnancy and implantation rates between agonist and antagonist groups (52.2% vs 60.8%, 15.1% vs 18.3%; p=0.327 and 0.652). CONCLUSIONS: The high number of metaphase oocytes and the high pregnancy rate observed in the oocyte donors provide evidence that GnRH antagonist does not impair ovarian response, embryo quality or pregnany rates. In oocyte donors cycles the GnRH antagonist is a valid alternative to GnRH agonist, providing the benefit of more flexibility in patient's scheduling.

[Influence of sperm morphology on results of intrauterine insemination]. / Influencia de la morfología espermática en los resultados de inseminación intrauterina.

OBJECTIVE: To determine the influence of sperm morphology, according to WHO criteria, on pregnancy rates of couples who were submitted to intra-uterine insemination (IUI). MATERIAL AND METHODS: Retrospective study that included 787 IUI cycles performed in the Instituto para el Estudio de la Concepción Humana in Monterrey, Mexico, from January to December 2002. Main diagnosis were anovulation, male factor, endometriosis, and cervical factor. All patients were allocated into a controlled ovarian hyperstimulation protocol with either clomiphene citrate, menotropins and/or recombinant FSH. RESULTS: A total of 115 pregnancies were achieved (pregnancy rate per cycle of 14.61%). When seminal parameters were analyzed as independent factors it was found that a motility less than 10%, total motile count after sperm preparation less than 1 million/ml and sperm motility less than 20% had a pregnancy rate of zero. CONCLUSIONS: Patients with normal sperm forms less than 20% according to WHO criteria have no benefit with the IUI and these patients should be canalized to ART.

[Comparison of the results of an assisted-reproduction program related with the day of follicular aspiration]. / Comparación de los resultados de un programa de reproducción asistida relacionados con el día de aspiración folicular.

UNLABELLED: The proper time for the oocyte retrieval allow us to obtain good quality oocytes In assisted reproduction techniques, improving fertilization and pregnancy rates. The follicular aspiration has been done by vaginal ultrasounds when we can see at least 3 follicles > or = 16 mm diameter. OBJECTIVE: To compare oocyte quality, fertilization and pregnancy rate-according to the day of the follicular aspiration. MATERIAL AND METHODS: 438 cycles were studied in the Instituto para el Estudio de la Concepción Humana in Monterrey Mexico, comparing oocyte quality, fertilization and pregnancy rate. RESULTS: If egg retrieval was done on day 12 of the cycle, we obtained a mean of 7.61 good quality oocytes, 51% of them fertilized and the pregnancy rate was 36.8%, when the aspiration was performed on day 13 of the cycle, we obtained a mean of 7 good quality oocytes, 59% of them fertilized and the pregnancy rate was 34%, and if the oocyte retrieval was on day 14 of the cycle, we obtained a mean of 6.42 good quality oocytes, 57% of the fertilized and the pregnancy rate was 31.7%. DISCUSSION: The oocyte quality, fertilization and pregnancy rate were slightly better if the oocyte retrieval was performed on day 12 or 13 of the cycle, rather than day 14. However this was no statistical significative.

[Prognostic values of oestradiol/oocyte rate in ICSI patients]. / Pronóstico del indice estradiol-ovulo en la inyección intracitoplasmática de espermatozoides (ICSI).

OBJECTIVES: To analyze the pregnancy rate in women who underwent Intracytoplasmic Sperm Injection (ICSI) program depending of the oestradiol/oocyte index. STUDY DESIGN: Retrospective, comparative. MATERIAL AND METHODS: 332 patients were included. There were divided in three groups depending on the oestradiol/oocyte index: Group A:(100 pg/mL, group B: 101-250 pg/mL and group C: > 250 pg/mL). Therapeutic protocol. Down regulation with leuprolide acetate in late luteal phase protocol, COH with rec-FSH and / or HMG, ultrasonographic and estradiol blood levels were monitored; hCG application when > 3 follicles > 18 mm, oocyte retrieval performed 34 hours later. We analyzed: patient age, male age, number of follicles, estradiol serum levels at the day of hCG application, number of mature oocytes, oestradiol/oocyte index, fertilization rate, transferred embryos, transfer quality, catheter type and luteal support. Statistical analysis (SPSS 11) with chi square, ANOVA and Kruskall-Wallis was used. RESULTS: On having analyzed the number of metaphase II oocytes retrieval, oocytes fertilized and number of transferred embryos among three groups, the best results were obtained in group B. The differences among these variables were significant. (P = 0.014, p = 0.005 and p = 0.003, respectively). When the oestradiol/oocyte index was analyzed and the PR among groups (21.83, 36.62 and 17.80 %) we observed a significant difference (p = 0.003). CONCLUSION: It is convenient to monitor the oestradiol blood levels to offer schemes of COH less aggressive to improve the oocyte quality. The oestradiol/oocyte index is a parameter adapted as a predictive value of pregnancy.

[High concentrations of serum estradiol in assisted reproduction]. / Altas concentraciones de estradiol sérico en reproducci6ón asistida.

OBJECTIVES: To analyze the influence of the levels of estradiol on the day of HCG in the pregnancy rate (PR) of ICSI and oocyte donation. STUDY DESIGN: Retrospective, comparative. MATERIAL AND METHODS: 333 patients underwent ICSI and 66 in oocyte donation were included dividing them according to the level of estradiol: a) < 1,000 pg/mL, b) 1,001-3,000 pg/mL and c) > 3,000 pg/mL. Therapeutic protocol: Down regulation with acetate leuprolide in late luteal phase, COH with FSHr and/or HMG, ultrasonographic monitoring and estradiol blood levels, HCG application with > 3 follicles > 18 mm, oocyte retrieval 34 hours later. We analyzed: PR, age (including receptors), FSH and LH. Number, mature grade and fertilized oocytes; luteal support, transfer quality and type of catheter. Statistical analysis (SPSS 11) with chi square, ANOVA and Kruskall-Wallis. RESULTS: ICSI: Older patients in group A (p < 0.001), but without difference between B and C groups (p = 0.08). Statistical difference in number of follicles, number of oocytes, fertilized oocytes and transferred embryos being less in the A group (p < 0.001). Statistical difference in PR 21.7, 35.6 and 25.7% in A, B and C groups respectively (p = 0.032). Oocyte donation: Group A has younger patients (p = 0.005), FSH and LH were similiar among groups. Major number of follicles were observed to increase estradiol levels, but major quantity of metaphase II and fertilized oocytes were observed in group B (p = 0.05). PR without significant differences: 50, 51.5 and 52.3% in groups A, B and C (p = 0.977). Without statistical difference in the age of receptors; transferred embryos, type of catheter and quality on ICSI and oocyte donation groups. CONCLUSION: High estradiol levels at the day of HCG application affect the PR in patients submitted to ICSI. The best results were obtained with estradiol levels between 1,000 and 3,000 pg/mL. In oocyte donation the high concentrations of estradiol do not affect the PR of the receptors.

[Methodology in gynaecological clinical research]. / Metodología de investigación clínica en Ginecología.

Every day the number of published articles in the world wide literature is increased; unfortunately, lot of them lack of a proper research-related methodology and therefore the conclusions might be of less scientific value. Clinicians need to develop their professional exercise based on scientific knowledge and so it is imperative to be familiar with research-related methodology. The present paper offers some tips in order to facilitate the reading and correct interpretation of clinical research.

Cultivo de blastocitos con medios secuenciales / Human blastocysts culture with sequential media

Son bien conocidas las ventajas de cultivar preembriones humanos hasta etapa de blastocisto. Esto no es nuevo, lo que es reciente es el empleo de medios de cultivo secuenciales sin el apoyo de células somáticas. El objetivo fue cultivar preembriones humanos hasta etapa de blastocisto para determinar las tasas de recuperación, tasa de implantación y tasa de embarazo en pacientes sometidas a FIVT/TE o ICSI. Una vez obtenidos los óvulos de las pacientes, fueron inseminados/inyectados para posteriormente ser cultivados por 72 horas. usando medio P1 al 10 por ciento de SSS bajo aceite mineral para posteriormente ser transferidos a un medio complejo para cultivo de blastocistos por 48 horas. y finalmente ser transferidos. Se incluyeron 13 pacientes (9 de FIV y 4 de ICSI) obteniendo 205 óvulos, fertilizaron 143 y 131 tuvieron división celular. Se cultivaron 121 preembriones a etapa de blastocisto de los cuales 53 alcanzaron esa etapa (43.8 por ciento), transfiriendo 28 y congelando 25. En promedio se transfirieron 2.1 blastocistos por paciente. Se presentaron cuatro embarazos y un recién nacido vivo a término para una tasa de implantación de 14.2 por ciento y una tasa de embarazo de 30 por ciento. El estudio muestra nuestra experiencia inicial, la cual demostró una aceptable tasa de recuperación de blastocistos y de embarazo.

Donación de óvulos: experiencia de tres años en el Centro de Ginecología y Obstetricia de Monterrey / Oocyte donation: three years of experience in the Ginecology and obstetric Center of Monterrey

Objetivo: Valorar las tasas de embarazo, nacidos vivos, índice de implantación y tipo de donadora en nuestro programa de Reproducción Asistida con donación de óvulos. Introducción. La donación de óvulos en un pilar en la reproducción asistida ya que nos aumenta las tasas de embarazos en pacientes con ausencia o disminución de la función ovárica dando las mismas oportunidades que las pacientes sin disfunción ovárica. Material y métodos: Se incluyeron 98 procedimientos de donación en pacientes receptoras de los cuales fueron 87 FIV-TE y 11 GIFT entre marzo de 1994 y junio de 1997. Las subdividimos por grupos de edad grupo 1: menores de 30 años, grupo 2: de 30 a 34 años, grupo 3: de 35 a 39 años y grupo 4: de 40 años y más. Dividimos las donadoras en anónimas (72) y conocidas (26) y analizamos resultados. Resultados: de los 87 FIV-TE-D se obtuvieron 48 embarazos (55.17 por ciento) con 31 nacidos vivos (35.63 por ciento). De los 11 procedimientos de GIFT-D hubo cinco embarazos y cinco recién nacidos vivos (45.45 por ciento). El índice de implantacion fue de 17.5 por ciento para FIV-TE y 13.8 para GIFT. De las donadoras anónimas fueron 44 embarazos (61.11 por ciento y de las conocidas 9 (34.61 por ciento). Conclusiones: Nuestros resultados se encuentran dentro de los informados a nivel mundial observando una diferencia muy significativa entre las tasas de embarazo con óvulos de donadoras conocidas y anónimas por lo que se debe hacer especial énfasis en la selección adecuada de la donadora conocida

Morbimortalidad de gemelos ingresados a una unidad de cuidados intensivos neonatales / Morbimortality of twins attended in a neonatal intensive care unit

Se presentan los resultados de un estudio retrospectivo realizado en un hospital privado en un periodo de 18 meses (1991-1992) para conocer la morbimortalidad de todos los gemelos ingresados a la Unidad de Cuidados intensivos Neonatales, siendo 20 pares de gemelos los cuales se dividieron para su estudio en el grupo A formado por el primer gemelo y B del segundo gemelo, confrontándose algunas variables. La edad promedio de las madres fue de 29 ñ 3 años; el 55 por ciento tuvieron ruptura prematura de membranas, el 90 por ciento nacieron por cesárea. La edad gestacional fue de 34.5 ñ 3.2 semanas versus (vs) 33.6 ñ 4.2 semanas (NS); peso 1955 ñ 503 g vs 1843 ñ 615 g (NS); hubo más hipotróficos en el grupo B necesitaron más frecuentemente ventilación mecánica intermitente que el grupo A (n=7 vs n=1), P < 0.05, debido a mayor incidencia de enfermedad de membrana hialina (P < 0.05). Hubo más casos de sepsis intrahospitalaria en el grupo B que en el grupo A ocasionando estancia hospitalaria más prolongada: 12 ñ 3.2 días vs 21 ñ 4.2 días (P < 0.05). Concluímos que la morbimortalidad aumentada de los gemelos es producida en la mayor parte por el segundo gemelo como lo demuestran nuestros resultados. Gemelos; morbimortalidad; mortalidad

Hiperestimulación ovática controlada y precapacitación espermática pre-GIFT / Controlled ovarian hyperstimulation and spermatic pre-capacitation pre-GIFT

Se ofreció a nuestras candidatas para transferencia de gametos a trompa de falopio (GIFT), ciclos de hiperestimulación ovárica controlada con citrato de clomifeno y gonadotropias de mujer monopáusida (hMG) y transferencia intrauterina de gametos (TIG) como prerequisito para entrar en nuestro programa de GIFT. Sus edades eran de 29 y 39 años con un promedio de esterilidad de seis años. Las causas para ser seleccionadas para el programa fueron: 15 por factor cervical, 13 masculino, nueve desconocidos, siete endometriosis, tres inmunológico y uno ovárico. El semen se preparó con la técnica de lavado y precapacitación espermática. Al final del estudio 18 pacientes se embarazaron (37.5%). Nuestros resultados justifican el uso de TIG con estimulación ovárica controlada como prerequisito para entrar a un programa de GIFT.

Ampty follicle syndrome: biological reaity

Dos pacientes ingresaron a nuestro programa de trnasferencia de gametos a la trompa de Falopio (GIFT), las cuales recibieron un protocolo de estimulación de la ovulación en base a citrato de clomifeno y hormonas gonadotrópicas de mujer menopaúsica (hMG). Se aplico gonadotropina coriónica humana (hCG, 10,000 UI IM) al llegar el crcimiento folicular a los 18 mm y la recuperación de los oocitos se programó a las 36 h. Los niveles de estradiol en las pacientes fueron de 1,127 y 2,722 pg/ml, respectivamente, al momento de aplicarse la hCG, lo que demuestra un excelente respuesta al esquema de estimulación. Se efectuó aspiración folicular por vía transvaginal y laparoscopia, no pudiendo recuperar oocitos en 17 folículos. Nuestros hallazgos apoyan la existencia del "síndrome de folículo vacío". Esta patología podría explicar algunas causas de infertilidad inexplicable en nuestra población de parejas estériles

Donación de óvulos y GIFT: nuevo concepto repoductivo / Oocytes donation and GIFT: new reproductive concept

Transferencia intratubaria de gametos (GIFT) se efectuó en 11 pacientes con falla gonadal prematura e infertilidad, utilizando donación de oocitos. La terapia sustitutiva esteroidea fue en base a Valerinato de Estradiol y Progesterona, mismas que se mantuvieron hasta el día 100 posterior a la transferencia. En todos los casos el GIFT se efectuó entre los días 13 y 70 del ciclo. Se lograron 5 embarazos de 11 ciclos (tasa de éxito de 45.4%) un embarazo culminó con un nacido vivo y los otros cuatro se encuentran en su primer, segundo y tercer trimestre. Se presenta un nuevo esquema simplificado para el manejo hormonal sustitutivo y ofrecemos resultados que sugieren una amplia "ventana endometrial" para el manejo de éstos esquemas. Los resultados ofrecen un futuro alentador para las pacientes con falla gonadal prematura

Esterilidad de origen endocrino-gonadal relacionada con amenorrea-galactorrea: tratamiento con bromocriptina / Sterility of endocrine-gonadal origin related to amenorrhea-galactorrhea: treatment with bromocriptine

Se estudió a 80 pacientes con síndrome de amenorrea-galactorrea relacionado con esterilidad endocrino-gonadal primaria (77.5%) o secundaria (22.5%)). El diagnóstico de anovulación se realizó mediante biopsia de endometrio o cuando se demostró un valor de prolactina sérica superior a 25 ng/ml pero inferior a 100 ng/ml. Se descartó la presencia de tumor hipofisiario empleando estudios de tomografía computada. El tratamiento de las pacientes consistió en la administración de bromocriptina en dosis de 5 mg por día durante un periodo de tres meses mínimo. La respuesta a la terapéutica se manifestó por la aparición de menstruación cíclica en 82.5% de pacientes, ovulación en 70% y embarazo en 42.5%. El índice de embarazos en los casos de esterilidad primaria fue 88.2% contra 11.8% de los de esterilidad secundaria; la evolución de los embarazos fue normal, registrándose sólo dos abortos; todos los productos fueron normales. Se concluye que en el estudio de pacientes con esterilidad anovulatoria, con o sin amenorrea y galactorrea, debe cuantificarse la prolactina sérica para establecer el diagnóstico correcto