Studies in the many-body problem in quantum mechanics

Ph.D.Harold A. Gersc

Do Multiple Attempts at Embryo Transfer Affect Clinical Pregnancy Rates?

Objective: During an in vitro fertilization treatment cycle, having embryos retained in the catheter after embryo transfer is a relatively uncommon and frustrating event. The reported incidence of retained embryos varies between 1% and 8%. It can be difficult to explain this unwanted event to patients. We wished to determine the incidence and the effect on pregnancy rates of having embryos retained in the transfer catheter, followed by immediate completion of transfer. Methods: We performed a retrospective chart review of all IVF cycles with embryos retained in the transfer catheter, followed by repeat transfer, between October 2009 and March 2012. We reviewed IVF cycles with or without ICSI, and included fresh and frozen embryo transfer cycles. All embryos were transferred on the third day after oocyte retrieval. Transabdominal ultrasound was used for guidance during the embryo transfer. Results: A total of 49 IVF treatment cycles with retained embryos that required re-transfer were identified. This represented 7.5% (49/652) of all IVF cycles with embryo transfer during that period. The clinical pregnancy rate in the repeat transfer group was 30.6% (15/49). The clinical pregnancy rate in all cycles in the same time period was 34.8% (227/652). These rates were not significantly different (P = 0.521). Conclusion: Having to re-transfer embryos retained in the transfer catheter does not have any significant effect on clinical pregnancy rates during IVF treatment cycles

Fertility and pregnancy outcomes following resectoscopic septum division with and without intrauterine balloon stenting: A randomized pilot study

BackgrounD AND OBJECTIVES: Although uterine stenting is performed routinely following hysteroscopic metroplasty, we were unable to find any evidence documenting its value with regards to septum reformation and/or obstetrical performance. To evaluate the benefits of intrauterine Foley catheter/balloon splinting after resectoscopic septum division on septum reformation, fertility, and pregnancy outcomes. Design AND SETTING: Prospective, randomized controlled pilot study (Canadian Task Force Classification I) conducted in university affiliated teaching hospital. Patients AND METHODS: Twenty-eight women with infertility and/or adverse pregnancy outcomes diagnosed with intrauterine septum were randomized into having a No. 14 pediatric Foley catheter/balloon for 5 days (n=13) vs. no balloon (n=15) following resectoscopic septum division. None of the patients received preoperative endometrial thinning, antibiotic prophylaxis or adjuvant postoperative hormone therapy. All uterine septa were divided under general anaesthesia using a 26 F (9 mm) resectoscope with a monopolar electrical knife using glycine irrigant solution (1.5%) and 120 watts of power of low voltage (cut) waveform. Results: The median age (range) was 29 years (23-38) and 32 years (22-40), respectively (P=.59). The groups were comparable by age, past obstetrical performance and comorbidities including endometriosis stage I-IV in 3 and 4 women, in the catheter/balloon and balloon group, respectively, and one in each group of polycystic ovarian syndrome and Crohn disease and one case of tubal obstruction in the balloon group. There were no intra- or postoperative complications. At 3 months, a hysterosalpingogram was done in 10 (77%) and 13 (87%) women, respectively, the results of which were normal. At 12-18 months, 1 woman in the balloon and 3 in the control group were not trying to conceive and 1 in each group had not conceived. Of the remaining women, 11 (92%) in each group had conceived and pregnancy outcomes included spontaneous abortion 3 (25%) and 4 (33.3%), ectopic pregnancy 0 and 1, second trimester loss 1 (8.3%) and 0 and term pregnancy 8 (66.6%) in both groups. Conception through assisted reproductive technology occurred in 2 and 1 woman, respectively. Conclusions: Following resectoscopic septum division with monopolar knife electrode, splinting the uterine cavity with Foley catheter provided no advantage in septum reformation, clinical pregnancy rate, and pregnancy outcomes

A mechanism stimulating sound production from air bubbles released from a nozzle

Gas bubbles in water act as oscillators with a natural frequency inversely proportional to their radius and a quality factor determined by thermal, radiation, and viscous losses. The linear dynamics of spherical bubbles are well understood, but the excitation mechanism leading to sound production at the moment of bubble creation has been the subject of speculation. Experiments and models presented here show that sound from bubbles released from a nozzle can be excited by the rapid decrease in volume accompanying the collapse of the neck of gas which joins the bubble to its paren

Positionum ex distinctis controversi iuris civilis, canonici & feudalis articulis deproperatarum centuria

de qua ... pro summo in utroque iure doctoris gradu, insigniis & privilegiis solemniter consequendis publice disputabit Thomas Holletus è Sil. Brigensis ... ad d. 12. Novemb. ...Enth. 100 ThesenDiss. iur. Basel, 160

Eclairage conceptuel d’une problématique émergente en gestion : l’addiction au travail

International audienc

Mindset and goal orientation in sales: results from a qualitative approach

International audienc

La résistance du client et ses conséquences sur les dispositions attitudinales et comportementales des commerciaux : proposition d'un modèle

International audienc

Valeur(s) et pratiques associées à la consommation de journaux gratuits

National audienceThis research focus on the value and consumption practices associated to “permanent” free goods as free newspapers. A qualitative study based on observation and semi-structured interviews underline the fact that free goods are valued or depreciated regarding three levels : individualized, public or societal.La recherche interroge la valeur et les pratiques associées à la gratuité « permanente » à travers l’exemple des journaux gratuits. Une étude exploratoire basée sur l’observation et des entretiens montre comment l’objet gratuit va être valorisé ou déprécié selon qu’il est envisagé de manière individuelle, sociale ou sociétale, et comment vont se construire des pratiques de consommation propres aux journaux gratuits