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1.
Int J Fertil Steril ; 15(4): 286-293, 2021 Oct.
Article in English | MEDLINE | ID: mdl-34913298

ABSTRACT

BACKGROUND: The objective of this study is to evaluate artificial oocyte activation (AOA) with calcium ionophore (CaI) in a subsequent attempt at fertilisation in patients after extremely low or failed fertilisation. We assessed improvements in fertilisation, implantation and pregnancy rates as well as cancellation rates in these patients. Finally, was evaluated the result testing in addition to delivery rate and obstetric outcomes in children born after AOA. MATERIALS AND METHODS: This was a retrospective observational study conducted in an IVF laboratory of an IVI clinic (IVIRMA Valencia, Spain). One group (509 mature oocytes from 66 patients) received a first intracytoplasmic sperm injection (ICSI) without AOA, which resulted in either a failed fertilisation or very low values (<30%). This group was compared with a second group (616 mature oocytes from the same 66 patients) that used AOA. Outcome was compared by McNemar's test and the dependent t tests. RESULTS: AOA plus CaI resulted in enhanced fertilisation (51 vs. 13.1%), ongoing pregnancy (47 vs. 21.7%), and implantation (31.1 vs. 13.1%) rates, and less chances for cancelling the cycle (22.7 vs. 69.3%). There were no observed adverse effects in obstetric and perinatal outcomes after the use of AOA. CONCLUSION: Our findings support the use of AOA for a given population of patients where fertilisation was affected during previous attempts. After AOA, we observed a significant increase in reproductive success due to the increased number of embryos available for embryo selection and, therefore, enhanced chances for success. The use of this artificial technique is comforting after checking non-existence of detrimental effects on the offspring.

2.
Rev. iberoam. fertil. reprod. hum ; 34(1): 21-33, ene.-mar. 2017. tab, graf, ilus
Article in Spanish | IBECS | ID: ibc-162672

ABSTRACT

ANTECEDENTES: La selección embrionaria sigue siendo uno de los grandes retos de la embriología para poder realizar más transferencias de un único embrión y mejorar los resultados de los tratamientos. Las aneuploidías son una de las principales causas que limitan las probabilidades de éxito, pero las técnicas disponibles actualmente para su diagnóstico son invasivas y costosas. El desarrollo de nuevos métodos precisos y no invasivos basados en parámetros morfocinéticos para detectarlas puede ser muy útil. OBJETIVOS: Revisar estudios relevantes que analicen la relación entre los parámetros morfocinéticos y las aneuploidías y el potencial de éstos para predecirlas. MATERIAL Y MÉTODO: Búsqueda en Pubmed utilizando palabras relacionadas con la morfología, la morfocinética y las aneuploidías embrionarias. También se han revisado las referencias de los artículos más relevantes y trabajos presentados en congresos internacionales celebrados recientemente. RESULTADOS: Numerosos estudios han analizado la capacidad de los parámetros morfocinéticos para detectar aneuploidías embrionarias. Algunos grupos han encontrado correlaciones significativas entre la ploidía y el tiempo de desaparición de los pronúcleos, los tiempos de diferentes divisiones celulares tempranas o parámetros más tardíos, como la duración de la compactación o el inicio de la blastulación. A partir de estos hallazgos, se han desarrollado modelos para clasificar los embriones según el riesgo de aneuploidía. Sin embargo, otros estudios no han encontrado ninguna correlación estadísticamente significativa y los resultados todavía son controvertidos. CONCLUSIONES: Ninguno de los parámetros morfocinéticos analizados proporciona suficiente precisión para diagnosticar aneuploidías embrionarias en las pacientes en las que está indicado realizar diagnóstico genético preimplantacional. Las diferencias entre los grupos pueden deberse al tipo de pacientes incluido y/o a las distintas técnicas utilizadas en cada laboratorio. Es necesario realizar más estudios que aclaren esta relación. Los parámetros morfocinéticos pueden, en determinados casos, ayudar a seleccionar embriones con mayor probabilidad de ser euploides, pero hoy en día la única forma fiable de hacer este diagnóstico es a través del diagnóstico genético preimplantacional. Ámbito: embriología. DISEÑO: revisión bibliográfica


BACKGROUND: Embryo selection still remains one of the great challenges in embryology in order to perform more single embryo transfers and improve clinical outcomes. Aneuploidy is one of the major causes of IVF failure, but the techniques applied for assessing embryo ploidy today are still invasive and expensive. New accurate non-invasive methods to select chromosomally normal embryos based on morphokinetic parameters can become useful. OBJECTIVES: To review relevant studies analysing the relationship between embryo morphokinetics and aneuploidy and the potential of these parameters to predict ploidy. MATERIAL AND METHOD: Search of Pubmed using keywords related to morphology, morphokinetics and embryo aneuploidy. References of the most relevant articles and communications presented in recent international meetings have also been reviewed. RESULTS: Numerous studies have analysed the ability of morphokinetic parameters to detect embryo aneuploidy. Some groups have found significant correlations between ploidy and timing of pronuclei fading, timing of early mitotic divisions as well as later morphologic events, such as the duration of compaction and the time of initiation of blastulation. Based on these results, different models have been developed to categorize the risk of aneuploidy in embryos. However, other studies have not found any statistically significant correlation and the results are still controversial. CONCLUSIONS: None of the morphokinetic parameters analysed is accurate enough to detect embryo aneuploidy in patients indicated for preimplantation genetic screening. Differences between groups may be due to the patient's populations included and/or variations in the techniques applied. Further studies are needed to clarify the possible relation. Morphokinetic parameters can aid in certain cases, to select embryos with higher probability of being euploid. However, preimplantation genetic screening still remains the only reliable technique to do such analysis. SETTING: embryology. DESIGN: review


Subject(s)
Humans , Aneuploidy , Fertilization in Vitro/methods , Embryo Transfer/methods , Preimplantation Diagnosis/methods , Predictive Value of Tests , Blastocyst/ultrastructure , Sex Chromosome Disorders/genetics , Zygote Intrafallopian Transfer/methods , Giant Cells/cytology , Mitotic Index/methods , Blastocyst/physiology
3.
Rev. lab. clín ; 3(3): 108-117, jul.-sept. 2010. tab, ilus
Article in Spanish | IBECS | ID: ibc-85219

ABSTRACT

Introducción. El espermiograma tiene una capacidad diagnóstica limitada a la hora de predecir una gestación en las técnicas de reproducción asistida. Parámetros moleculares como los ARN mensajeros presentes en el esperma no se evalúan. Nuestro grupo ha realizado listados de genes diferencialmente expresados (GDE) de muestras de semen que lograban un embarazo (E) frente aquellas que no (NE), en pacientes que se sometían a ciclos de IAH o de ICSI. El objetivo era caracterizar los perfiles de expresión, usando la tecnología del microarray, de muestras de semen que logran o no embarazo en ciclos de IAH o ICSI. Material y métodos. 30 muestras de semen (10 lograron embarazo [E=10] y 10 no [NE=10]) se obtenían de pacientes que se sometían a un ciclo de IAH y 10 muestras de semen (E=5, NE=5) que se sometían a uno de ICSI con ovocitos de donantes. Finalmente se realizaron 4 microarrays con las muestras de semen que lograban embarazo frente aquellas que no para ambas técnicas evaluándose los GDE que había entre los grupos E y NE tanto en IAH como en ICSI. Resultados. El número total de genes (NTG) detectados en el microarray de IAH fue de 19.938 y 19.229 en ICSI. El número total de GDE fue de 950 en IAH y 49 en ICSI. Conclusiones. Los datos revelan que los factores moleculares requeridos para lograr embarazo son diferentes según la técnica utilizada. Conclusiones. Estas diferencias pueden ser potencialmente empleadas como marcadores de éxito en ambas técnicas y como futura herramienta terapéutica (AU)


Introduction. Basic sperm analysis has insufficient predictive power on pregnancy achievement in assisted reproductive techniques (ARTs). Molecular parameters such as as mRNA present within spermatozoa are not assessed. Our group listed differentially expressed genes (DEG) from sperm samples (SS) from that achieve pregnancy (group P) vs. those that do not (group NP) using microarray technology in couples undergoing homologous IUI and ICSI. The aim is to use microarray technology to characterise the different gene expression profiles (EP) between SS that achieve pregnancy or not in ICSI and IUI cycles. Material and methods. Ten SS (5 that achieved and 5 that did not achieve pregnancy) were obtained from IP undergoing ICSI and 20 (10 that achieved and 10 did not achieve pregnancy) IAH cycles with oocytes from young donors and their healthy female partners respectively. After freezing aliquots of the SS employed for both treatments and their respective mRNA expression profiles were compared. Finally 4 microarrays were performed in duplicate with sperm samples from group P vs. NP from both techniques and those DEG were evaluated at least twice, with statistically significant differences between P and NP SS for each group. Results. Total number of genes (TNG) in IUI microarray was 19938 and 19229 in ICSI. The total number of DEG (950) in the IAH group was much greater than in the ICSI group (49). Conclusions. These data reveal that molecular features required for pregnancy are different in IUI and ICSI procedures. Conclusions. These differences could be potentially employed to detect ICSI and IUI success markers or to improve pregnancy rates in these procedures (AU)


Subject(s)
Humans , Male , Adult , Gene Expression/genetics , Gene Expression/physiology , Gene Expression Profiling/methods , Gene Expression Profiling , Insemination, Artificial/methods , Insemination, Artificial , Reproduction/genetics , Reproductive Techniques/instrumentation , Reproductive Techniques/trends , Gene Expression , Semen/physiology , Semen , Tissue and Organ Harvesting , Reproductive Techniques , Data Analysis/methods
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