the probability of losing a customer in m/g/n/0 and gi/m/n/0 loss queuing systems withheterogeneous servers is minimized. the first system uses a queue discipline in which a customer who arriveswhen there are free servers chooses any one of them with equal probability, but is lost otherwise. providedthat the sum of the servers rates are fixed, loss probability in this system attains minimum val...

recurrent pregnancy loss (rpl) is a multifactorial disorder that remains idiopathic in 50% of the cases. the aim of this study was to investigate the association between mthfd1 as well as enos polymorphisms with idiopathic rpl. in a case-control study, 100 women with idiopathic recurrent pregnancy loss (prl) and 50 controls referred to noor laboratory, khoozestan, iran, were evaluated. genotypi...

recurrent pregnancy loss is usually defined as the loss of two or more consecutive pregnancies before 20 weeks of gestation, which occurs in approximately 5% of reproductive-aged women. it has been suggested that women with thrombophilia have an increased risk of pregnancy loss and other adverse pregnancy outcomes. thrombophilia is an important predisposition to blood clot formation and is cons...

Recurrent pregnancy loss, defined as a pregnancy failure occurring before 24 weeks of gestation more than two or three times according to most definitions, is a fertility defect encountered in 1-5% of the patients. This defect is of course of multifactorial origin. Among the possible origins of recurrent pregnancy loss are uterine structural defaults, defective ploidy control of the embryo, def...

Background: There are different etiological factors in spontaneous recurrent abortion which are one of the complications in pregnancy. Primary embryo development in uterine tube and oviduct are affected by different factors such as embryotrophic elements. ETF3 as a embryotrophic factor that contains a complex of complement 3 protein and its derivatives specially iC3b, causes embryo trophoblast ...

In recurrent pregnancy loss, current practice often fails to make a diagnosis, as the fetal causes of pregnancy loss are usually ignored and only the maternal factors are assessed. Hence, it has been almost impossible to show that any treatment has an effect. This presentation is concerned with the fetal causes of recurrent pregnancy loss. The maternal causes are well known and include: uterine...

Chronic endometritis (CE) is an infectious disease of the uterine lining, which characterized by endometrial stromal plasmacyte (ESPC) infiltration. CE often seen in infertile women with a history repeated implantation failure (RIF) following vitro fertilization-embryo transfer program, recurrent pregnancy loss, and unknown etiology. Oral antibiotic agents, such as doxycycline, metronidazole, c...

Recently, assisted reproductive techniques have been used to prevent further miscarriages in women with recurrent miscarriage. One approach uses either screening or diagnosis of embryonic chromosomes prior to embryo replacement [preimplantation genetic screening (PGS)/preimplantation genetic diagnosis (PGD)]. The second approach involves surrogacy. However, PGS/PGD assumes that the embryo is ch...