El mercurio es un metal muy utilizado en la industria y en minería en el Perú. El objetivo del presente trabajo fue determinar la toxicidad letal aguda embriotóxica del Hg2+, en forma de cloruro de mercurio (HgCl ) en Helisoma trivolvis (Say, 1817) a 24 h de exposición. Las concentraciones 2 ensayadas fueron 514; 51,4; 5,14 y 0,51 ug de Hg2+ L-1 a partir de la sal a base de HgCl usando 2 como diluyente al agua declorinada. Los embriones de caracol fueron considerados muertos cuando no presentaban movimiento de rotación durante aproximadamente 30 seg. Los porcentajes de mortalidad de estadios embrionarios de H. trivolvis aumentaron con cada una de las concentraciones crecientes de Hg2+ a las 24 h de exposición. A una concentración de 514,4 ug de Hg2+ L-1 se observaron que existen diferencias significativas con el control. Además, la concentración de 514,4 ug de Hg2+ L-1 mostró d...

Known causes of unsuccessful pregnancy in couples undergoing assisted reproduction treatment include embryo aneuploidies. Preimplantation genetic diagnosis (PGD) is a technique used in assisted reproduction in order to detect these abnormalities, select embryos chromosomally normal and subsequently transfer to the patients’ uterus. Embryos with single aneuploidies may have the ability to survive and achieve unnoticed implantation. Objectives: To determine incidence of single aneuploidies in good quality embryos in third day of development to blastocyst. Design: Statistical and experimental study. Setting: Reprogenetics Latin-America and Assisted Reproduction Center - Concebir. Biologic material: Samples of embryo biopsies. Methods: Comparative analysis of results from evaluation of each sample obtained by embryo biopsy on the third and fifth days of embryonic development, performing PG...

Introduction: The spermatogram is used as a test of seminal quality. Recently, the sperm fragmentation test has demonstrated importance as sperm DNA integrity would affect clinical results in assisted reproduction treatments. Objectives: To determine spermatogram variables that would independently predict sperm DNA fragmentation index (SFI). Design: Retrospective, comparative study. Settings: Grupo PRANOR, Reprogenetics Latinoamerica, Clinica Concebir, Lima, Peru. Biologic material: Sperm. Methods: Individual variables and two models were compared: the first model considered percentage of sperm viability and patient’s age; the second model included percentage of motile sperms and age. Logistic regression analysis was done. Main outcome measures: Sperm viability, age. Results: Multivariate analysis showed that both models were significantly superior to individuals variables (p<0.01). Th...

Introduction: The spermatogram is used as a test of seminal quality. Recently, the sperm fragmentation test has demonstrated importance as sperm DNA integrity would affect clinical results in assisted reproduction treatments. Objectives: To determine spermatogram variables that would independently predict sperm DNA fragmentation index (SFI). Design: Retrospective, comparative study. Settings: Grupo PRANOR, Reprogenetics Latinoamerica, Clinica Concebir, Lima, Peru. Biologic material: Sperm. Methods: Individual variables and two models were compared: the first model considered percentage of sperm viability and patient’s age; the second model included percentage of motile sperms and age. Logistic regression analysis was done. Main outcome measures: Sperm viability, age. Results: Multivariate analysis showed that both models were significantly superior to individuals variables (p<0.01)....

The DNA replication is disrupted by Busulfan which is a bifunctional alquilant as an ester agent. High dose of this compound are applied before transplants of bone marrow and germ cells. However quantification of the damage to the reproductive system and its recovery have not been established. The aim of this study was to quantify both spermatogenesis and spermiogenesis recovery in mice from damage caused by an injection of Busulfan. We used Balb C mice which were evaluated 30, 54 and 72 days after the intraperitoneal injection of 40 mg/kg body weight. We took the following variables: testicular weight, spermatic concentration in epididimus line and histological cuts to measure the diameter of the seminiferous tubules. Results were analyzed with the test U Mann-Whitney p>0.05. By day 30, testicular weight, spermatic concentration and diameter of the seminiferous tubules were reduced t...

The DNA replication is disrupted by Busulfan which is a bifunctional alquilant as an ester agent. High dose of this compound are applied before transplants of bone marrow and germ cells. However quantification of the damage to the reproductive system and its recovery have not been established. The aim of this study was to quantify both spermatogenesis and spermiogenesis recovery in mice from damage caused by an injection of Busulfan. We used Balb C mice which were evaluated 30, 54 and 72 days after the intraperitoneal injection of 40 mg/kg body weight. We took the following variables: testicular weight, spermatic concentration in epididimus line and histological cuts to measure the diameter of the seminiferous tubules. Results were analyzed with the test U Mann-Whitney p>0.05. By day 30, testicular weight, spermatic concentration and diameter of the seminiferous tubules were reduced t...

Introduction: Preimplantational genetic studies are used to achieve a better implantation rate and live birth, as well as to decrease the abortion rate; these techniques should be evaluated. Objective: To evaluate preimplantational embryo development in donor oocyte in vitro fertilization cycles with genetic studies. Design: Retrospective cohort study. Setting: Pranor Laboratory, 2008-2013. Material: In vitro fertilization with ovodonation (IVF-OD) cycles. Interventions.: 2 077 cycles of IVF-OD were evaluated, separated in 3 cohorts: Cohort 1, cycles with embryo biopsy on day 3, by means of an incision in the zona pellucida (ZP), for excision of a blastomer (n = 527); Cohort 2, cycles with a laser incision at day 4 of embryo development, for biopsy of the trophoblast in the blastocyst stage (n = 131) and; cohort 3, FIV-OD cycles without any intervention (n = 1 419). Main outcome measures...