BACKGROUND Approximately 18% of multiple births in the USA result from assisted reproduction technology (ART). Although many studies comparing ART and naturally conceived twins report no difference in risks for perinatal outcomes, others report slight to moderate positive or protective associations. METHODS We selected twin deliveries with and without indication of ART from Massachusetts live...

Background: Vitamin D, a steroid hormone, has critical roles in human health. The available data thus identify vitamin D as an important substance in processes involved in reproductive success and thereby suggest pathophysiological mechanisms for reproductive compromise in the setting of vitamin D deficiency. Realizing the prevalence of vitamin D insufficiency in our country, we hypothesized th...

background: implantation is one of the essential steps for the success of assisted reproductive techniques (art). their success depends on three main factors: embryo quality, endometrial receptivity (er), and synchrony between embryo and endometrium. there are various factors that regulate the complex process of implantation. in this regard, one may refer to human chorionic gonadotropin (hcg) a...

n little more than two decades, the subject of multiple pregnancy has evolved from an obstetric curiosity to an issue of international medical and social concern. The overall number of multiple pregnancies has increased dramatically, not only for twins, but also for triplets and higher-order births. In addition, physicians and society are now concerned with a previously unknown type of multiple...

HIV infected patients receiving antiretroviral therapy (ART) can develop avascular osteonecrosis, 45 times greater than the general population. Avascular osteonecrosis increased in the last few years in patients with HIV infection. The most important mechanisms for avascular osteonecrosis in HIV-infected patients are: changes in bone metabolism, especially osteoporosis correlated with protease ...

background & aim: warm water immersion during labor is associated with relaxation and pain reduction for pregnant women. this method is not extensively used in iran, given the fear of infection and other maternal/neonatal complications. alternative methods are required to increase the safety of normal vaginal delivery. the purpose of this study was to compare maternal and neonatal outcomes, ass...