43 results on '"Ionescu CA"'
Search Results
2. Neural Flows in Hopfield Network Approach
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Ionescu Carmen, Panaitescu Emilian, and Stoicescu Mihai
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neural cell ,nonlinear dynamics ,Physics ,QC1-999 - Abstract
In most of the applications involving neural networks, the main problem consists in finding an optimal procedure to reduce the real neuron to simpler models which still express the biological complexity but allow highlighting the main characteristics of the system. We effectively investigate a simple reduction procedure which leads from complex models of Hodgkin-Huxley type to very convenient binary models of Hopfield type. The reduction will allow to describe the neuron interconnections in a quite large network and to obtain information concerning its symmetry and stability. Both cases, on homogeneous voltage across the membrane and inhomogeneous voltage along the axon will be tackled out. Few numerical simulations of the neural flow based on the cable-equation will be also presented.
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- 2013
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3. The Yang-Mills fields — from the gauge theory to the mechanical model
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Constantinescu Radu and Ionescu Carmen
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05.45.-a ,11.10.ef ,extended brst symmetry ,yang-mills models ,nonlinear dynamics ,Physics ,QC1-999 - Published
- 2009
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4. From the Hamiltonian to the Lagrangean formalism for 1-reducible theories. The Freedman-Townsend model
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Constantinescu Radu and Ionescu Carmen
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sp(3) brst symmetry ,equivalence between lagrangean and hamiltonian formalisms ,11.10.ef ,Physics ,QC1-999 - Published
- 2006
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5. Effect of Treatment with Progestins and Antiplatelet Agents on IVF in Women with Adenomyosis and Recurrent Implantation Failure.
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Pacu I, Zygouropoulos N, Zampieri G, Petca A, Poenaru MO, and Ionescu CA
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Background: This prospective study aims to identify the effect of the dienogest 2 mg/day and aspirin 150 mg/day combined treatment for two months before frozen ET on the assisted reproduction outcome in women with adenomyosis and recurrent implantation failure (RIF). Methods: Patients were selected based on specific criteria and divided into two groups (with and without treatment). Preimplantation biochemical parameters and ultrasonographic features (endometrial thickness, uterine peristalsis, and junctional zone thickness) were compared with pregnancy rate in a non-natural cycle frozen embryo transfer technique. A comparison between the two study groups indicated an increased successful implantation rate and clinical pregnancy rate (25% vs. 7.4%). Results : These results were attributed to the reduced uterine peristalsis and the reduction in thickness of the junctional zone following treatment. Available data were limited due to the nature of the study though maximal effort was exerted for the selected patients between groups to be as demographically similar and free from other potential pathology that may affect the results. Conclusions: In conclusion, it appears that the above stated treatment improves outcomes in women with adenomyosis and RIF; the parameters used may provide an insight as to the reasons why this occurs, though an explanation of the molecular mechanisms is still elusive.
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- 2024
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6. Contributions Regarding the Study of Pulsatility and Resistivity Indices of Uterine Arteries in Term Pregnancies-A Prospective Study in Bucharest, Romania.
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Zampieri G, Matei A, Roșu GA, Marin A, Poenaru MO, and Ionescu CA
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Pregnancy is a complex stage in a woman's life, considering the physical and psychological changes that occur. The introduction of Doppler studies of the pregnant woman's vessels and those of the fetus has proven to be a useful tool in evaluating the maternal-fetal relationship. Objective : The study aims to assess the correlations of PI and RI values in term pregnancies. Methods: This analysis is based on the prospective evaluation of medical data from 60 patients who were admitted to the Obstetrics and Gynecology department of Saint Pantelimon Hospital in Bucharest, Romania, from May to August 2024. Among the examined parameters are patient age, blood pressure, amniotic fluid quantity, placenta location, and pulsatility and resistivity indices of uterine arteries. Results: A higher diastolic blood pressure is associated with higher mean PI and RI values, indicating that diastolic blood pressure has a significant correlation to these values. The mean RI shows a moderately negative and significant correlation, suggesting that a lower level of amniotic fluid is associated with a higher mean RI. Regarding the PI value of the uterine arteries, the p -value suggests that the difference between the groups with and without associated diseases is statistically significant. Placental insertion on the anterior or posterior uterine wall does not have a significant impact on the PI and RI values of the uterine arteries, but the values are higher in the contralateral part of the placental insertion. Conclusions: These results strengthen the evidence previously demonstrated. Uterine artery Doppler ultrasonography is an extremely useful tool in monitoring and managing high-risk pregnancies.
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- 2024
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7. Isthmocele‑an iatrogenic pathology: A prospective study in a tertiary unit.
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Zampieri G, Nitescu B, Pacu I, Neacsu A, and Ionescu CA
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Isthmocele, also known as uterine niche, refers to a myometrial defect of the anterior wall of the uterine isthmus, specifically at the site of the previous C-section scar. The prevalence of isthmocele has increased in tandem with the rise in deliveries by caesarean section. Risk factors include aspects related to the surgical procedure. The present study aimed to assess the relationship between various suture types and the development of a niche. The analysis of the present study is based on data collected from the evaluation of 52 patients, 6 weeks post C-section performed in 'Saint Pantelimon' Hospital in Bucharest, Romania. The parameters examined included patient age, the number of previous births by C-section, the type of suture used and uterine anatomy. Out of all the 52 patients, 42.3% developed an isthmocele. The results confirm a significant association between the presence of the niche and the type of suture of the first layer, proving that when non-locking continuous suture was used, the absence of niche was observed in most cases, while using the locking continuous suture was associated with more niches. Using the continuous locking suture for the first layer was associated with severe niches, while no severe niches were observed in patients with the other two types of sutures. There is a statistically significant association between the use of continuous locking sutures for uterine closure in the first layer and the development of a uterine niche. Furthermore, all instances of severe niches were linked to this type of suture, compared with continuous non-locking suture or interrupted suture. Given the escalating rate of C-sections, further research is crucial to identify the suture type that minimizes the risk of isthmocele formation. The present study's limitations revolve around its exclusive focus on a single institution and the relatively small sample size., Competing Interests: The authors declare that they have no competing interests., (Copyright: © 2024 Zampieri et al.)
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- 2024
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8. Challenges and perceptions of e-learning for educational sustainability in the "new normality era".
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Fülöp MT, Breaz TO, Topor ID, Ionescu CA, and Dragolea LL
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Background: All universities were faced with the challenges of e-learning when they suddenly had to switch to distance learning in March 2020 due to COVID-19 regulations. Several challenges may arise when implementing e-learning, including an insufficient budget or problems with adoption. Nevertheless, the role of digitalization is to ensure the university's long-term sustainability. Indeed, the future of e-learning depends on future generations, which increasingly accept new technologies., Objectives: This study aimed to analyze the factors that stimulate university students' acceptance of technology., Methodology: The study population comprised Romanian university students who took online courses during the COVID-19 pandemic. A questionnaire survey was employed to gather primary data. The surveys were distributed between January and February 2022. In particular, 1,875 questionnaires were received from students, who were the focus of this study (the results for teachers were presented in previous research). To process and interpret the data, the method of modeling with structural equations (SEM) was used. The data collected were processed using SPSS and AMOS., Findings: The results indicate that external factors do not influence perceived usefulness. Accordingly, students consider that the perceived ease of use does not influence the behavior intention to use new technologies., Conclusion: The results linked e-learning satisfaction to academic success and Romanian students who utilized e-learning during the pandemic. In addition, the results indicate that external factors do not influence perceived usefulness. Accordingly, students consider that the perceived ease of use does not influence the behavior intention to use new technologies. The results validated the basic variables of the TAM model., Implications: The study presents a series of theoretical, practical, and societal implications that can guide universities in adopting sustainable development goals., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Fülöp, Breaz, Topor, Ionescu and Dragolea.)
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- 2023
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9. Comprehensive Assessment of Tailing Dumps' Impact on Water Quality of Rivers, Lakes, and Wells from Mining Areas.
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Murarescu O, Radulescu C, Dulama ID, Muratoreanu G, Pehoiu G, Stirbescu RM, Bucurica IA, Stanescu SG, Ionescu CA, and Banica AL
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- Adult, Child, Humans, Water Quality, Lakes, Copper, Charcoal, Cadmium, Lead, Environmental Monitoring methods, Risk Assessment, Rivers, Uranium
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This study is the third in a series of investigations conducted by the authors, and certainly the most comprehensive research regarding the former uranium, copper, and charcoal mines from a particular geographical area of Romania. In this respect, the present scientific incursion focused on two areas containing former extraction uranium ore sites, Ciudanovita and Lisava, as well as copper ore from Moldova Noua and charcoal mines from Anina, Banat Region, Romania. It highlighted that, for the first time, the heavy metal concentration was correlated with the values of physicochemical indicators of water (i.e., EC, DO, pH, resistivity, salinity, and ORP), by using multivariate analysis, to shape a regional based model on spatial distributions and the variability of toxic contaminants from the hydrographic basin of Banat, Romania, as a consequence of former uranium, copper, and charcoal mines. In this regard, 11 metals including Al, Cr, Mn, Fe, Ni, Co, Cu, Zn, Sr, Cd, and Pb from different water samples (well, spring, river, and lake), collected from three mining areas (uranium, copper, and coal mines) were investigated. Non-carcinogenic and carcinogenic health risks of seven heavy metals were assessed using the EDI, DIM, and THQ. The obtained THQ values were within the acceptable limits for cancer risks for adults, but as regards children, eight samples out of 18 proved toxic. However, the HRI and THQ average values for Cd (0.265 adults/0.996 children) and Pb (0.025 adults/0.095 children) for children were 3-4 times higher than those for adults. This is a source of concern as their prevalence in well water exposes children and residents in the Banat Region to the risk of various types of cancers.
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- 2022
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10. SARS-CoV-2 Infection during Pregnancy and Histological Alterations in the Placenta.
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Pacu I, Roșu GA, Zampieri G, Rîcu A, Matei A, Davițoiu AM, Vlădescu T, and Ionescu CA
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(1) Background: Despite the high number of cases of COVID-19 during pregnancy, SARS-CoV-2 congenital infection is rare. The role of the placenta as a barrier preventing the transmission of SARS-CoV-2 from the mother to the fetus is still being studied. This study aimed to evaluate the impact of SARS-CoV-2 infection on placental tissue. (2) Methods: This was a transversal monocentric observational study. In the study, we included pregnant women with COVID-19 who delivered at "Sfântul Pantelimon" Clinical Emergency Hospital between 1 April 2020 and 30 March 2022. Histological analyses, both macroscopic and microscopic, were performed for placentas that came from these cases. (3) Results: To date, a characteristic placental lesion has not been clearly demonstrated, but most findings include features of maternal and fetal vascular malperfusion, which probably reflect the reduction in placental blood flow due to low oxygen level from the hypoxic respiratory disease and underlying hypercoagulable state induced by the COVID-19 infection. (4) Conclusions: The histopathological aspects found in placentas that came from COVID-19-positive pregnant women are common for many other diseases, but when they are found together, they are highly suggestive for viral infectious involvement of the placenta.
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- 2022
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11. The role of universities' sustainability, teachers' wellbeing, and attitudes toward e-learning during COVID-19.
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Fülöp MT, Breaz TO, He X, Ionescu CA, Cordoş GS, and Stanescu SG
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- Attitude, Humans, Learning, Universities, COVID-19, Computer-Assisted Instruction
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In recent years, universities worldwide have experienced rapid changes with an immense impact, which have been influenced by technological progress and the social trends of digitalization. Like all other revolutionary changes, digital transformation involves intense adjustment/readjustment. University sustainability must be the active concern of all higher education institutions. Thus, the present research aims to analyse teachers' acceptance of new technologies and the impact on their wellbeing and university sustainability. The main objective was to analyse the acceptance of technology in special the e-learning opportunities and the wellbeing of teacher in an emergent country like Romania. To achieve our goal, we created a questionnaire based on the literature, and with the help of the technology acceptance model, we tested our hypotheses. The results indicate several discontents on the part of teachers concerning adapting to new technologies and even a personal discomfort in adapting to these new technologies. Thus, we can note that wellbeing significantly influences job satisfaction and teachers' involvement in sustainable development., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Fülöp, Breaz, He, Ionescu, Cordoş and Stanescu.)
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- 2022
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12. The Risk of Obstetrical Hemorrhage in Placenta Praevia Associated with Coronavirus Infection Antepartum or Intrapartum.
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Pacu I, Zygouropoulos N, Cristea AE, Zaharia C, Rosu GA, Matei A, Bodei LT, Neacsu A, and Ionescu CA
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- Cesarean Section adverse effects, Female, Hemorrhage complications, Humans, Infant, Newborn, Placenta, Pregnancy, Retrospective Studies, SARS-CoV-2, COVID-19 complications, Placenta Accreta epidemiology, Placenta Accreta etiology, Placenta Previa epidemiology, Placenta Previa etiology
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Background and Objectives : The aim was to evaluate the severity of obstetrical bleeding in the third trimester associated with COVID infection in placenta previa and accreta. Materials and Methods : A retrospective study was conducted to compare the risk of obstetrical bleeding in the case of placenta previa with or without associated SARS-CoV-2 infection. Patients presenting with placenta previa before labor were classified into three groups: group A (control) as no infection throughout their pregnancy, group B as confirmed infection during the 1st trimester, and group C as confirmed infection at the time of delivery. Infected patients were stratified according to the severity of signs and symptoms. The severity of obstetrical hemorrhage at birth was assessed quantitatively and qualitatively. All placentas were analyzed histologically to identify similarities. Results : Prematurity and pregnancy-induced hypertension appear significantly related to SARS-CoV-2 infection during the 3rd trimester. Placenta accreta risk increases significantly with infection during the 1st trimester. No statistically significant differences in the severity of hemorrhage associated with childbirth in cases with placenta previa between groups A and C but increased obstetrical bleeding mainly due to emergency hemostatic hysterectomy in group B driven by placenta accrete were detected. Obstetrical hemorrhage at birth in the case of coexistence of the infection was found not to correlate with the severity of the viral disease. Meanwhile, the number of days of hospitalization after birth is related to the specific treatment of COVID infection and not related to complications related to birth. Conclusions : The study finds an increased incidence of placenta accreta associated with placenta previa in cases where the viral infection occurred in the first trimester of pregnancy, associated with an increased incidence of hemostasis hysterectomies in these patients. Placental histological changes related to viral infection are multiple and more important in patients who had COVID infection in the first trimester.
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- 2022
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13. Characterization of the Tumor Microenvironment and the Biological Processes with a Role in Prostatic Tumorigenesis.
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Ionescu CA, Aschie M, Matei E, Cozaru GC, Deacu M, Mitroi AF, Baltatescu GI, Nicolau AA, Mazilu L, Tuta LA, Iorga IC, Stanigut A, and Enciu M
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Prostate intratumoral heterogeneity, driven by epithelial−mesenchymal plasticity, contributes to the limited treatment response, and it is therefore necessary to use the biomarkers to improve patient prognostic survival. We aimed to characterize the tumor microenvironment (T lymphocyte infiltration, intratumoral CD34, and KI-67 expressions) by immunohistochemistry methods and to study the biological mechanisms (cell cycle, cell proliferation by adhesion glycoproteins, cell apoptosis) involved in the evolution of the prostate tumor process by flow-cytometry techniques. Our results showed that proliferative activity (S-phase) revealed statistically significant lower values of prostate adenocarcinoma (PCa) and benign prostatic hyperplasia (BPH) reported at non-malignant adjacent cell samples (PCa 4.32 ± 4.91; BPH 2.35 ± 1.37 vs. C 10.23 ± 0.43, p < 0.01). Furthermore, 68% of BPH cases and 88% of patients with PCa had aneuploidy. Statistically increased values of cell proliferation (CD34+ CD61+) were observed in prostate adenocarcinoma and hyperplasia cases reported to non-malignant adjacent cell samples (PCa 28.79 ± 10.14; BPH 40.65 ± 11.88 vs. C 16.15 ± 2.58, p < 0.05). The CD42b+ cell population with a role in cell adhesion, and metastasis had a significantly increased value in PCa cases (38.39 ± 11.23) reported to controls (C 26.24 ± 0.62, p < 0.01). The intratumoral expression of CD34 showed a significantly increased pattern of PCa tissue samples reported to controls (PCa 26.12 ± 6.84 vs. C 1.50 ± 0.70, p < 0.01). Flow cytometric analysis of the cell cycle, apoptosis, and adhesion glycoproteins with a critical role in tumoral cell proliferation, T cell infiltrations, Ki-67, and CD 34 expressions by IHC methods are recommended as techniques for the efficient means of measurement for adenocarcinoma and hyperplasia prostate tissue samples and should be explored in the future.
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- 2022
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14. Prognostic value of the location of submucosal uterine leiomyomas in infertility.
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Roșu GA, Ionescu CA, Călin FD, Dimitriu M, Pleș L, Matei A, and Navolan DB
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Submucosal fibroid location and size are predictive factors of impaired fertility. Submucosal fibroids cause infertility through several mechanisms including distortion of the endometrial cavity, increased uterine contractility, local inflammation and remodeling of the endometrial blood supply. This is a monocentric, retrospective, cross-sectional study, conducted in the Department of Obstetrics and Gynecology of 'Sf. Pantelimon' Clinical Emergency Hospital, analyzing patients from a 5-year period (January 2015-December 2019). In the present study, the relationship between different characteristics of the submucosal fibroids (among others, location and dimensions) and fertility (birth rates, early pregnancy loss rates) were investigated. This study identified that submucosal and intramural fibroids are risk factors for reduced birth rate compared with subserosal fibroids (P=0.02, RR=2.58, 95% CI 1.03-6.47; P=0.005, RR=1.18, 95% CI 1.02-1.35, respectively). In addition, G2 leiomyomas are risk factors for low birth rate compared with G0 and G1 fibroids (P=0.01, RR=1.95, 95% CI 1.05-3.60). Moreover, the presence of a subserosal fibroid was associated with an increased early pregnancy loss rate (P=0.01, RR=2.14, 95% CI 1.05-4.35). In conclusion, the location and degree of uterine cavity distortion are important factors that alter the normal development of a pregnancy and the birth rate., Competing Interests: The authors declare that they have no competing interests., (Copyright © 2020, Spandidos Publications.)
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- 2021
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15. Use of platelet-rich plasma in the treatment of infertility in poor responders in assisted human reproduction procedures.
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Pacu I, Zygouropoulos N, Dimitriu M, Rosu G, and Ionescu CA
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Couple infertility is a pathology with an absolute number of cases growing markedly over the last decade in connection mainly with the increased age of couples wishing to conceive. Platelet-rich plasma (PRP) is an alternative treatment used for several years for experimental purposes. Yet, this method is not yet defined as a standard therapeutic option in the infertility protocol for poor responders in assisted human reproduction procedures. Thus, the present study is a retrospective study conducted between February 2019 and February 2020 to evaluate the effect of ovarian PRP injection in patients with a poor ovarian response (POR) to ovarian stimulation. Women (n=20; age 31-44 years) diagnosed with POR based on the European Society of Human Reproduction and Embryology criteria underwent ovarian injection with autologous PRP injection. Markers of ovarian reserve before, during the following two menstrual cycles, and at six months after treatment were followed as well as stimulation and fertilisation parameters before and post-treatment. PRP treatment resulted in increased antral follicle count and serum anti-Mullerian hormone, while levels of serum follicle-stimulating hormone and luteinising hormone were decreased. These changes were more pronounced during the 2nd menstrual cycle following treatment. By six months following the injection, their values return to pre-treatment levels and any small differences were not considered statistically significant. The average dose of gonadotropin used and duration remained statistically unchanged, but a significant increase in estradiol achieved by the day of the human chorionic gonadotropin trigger day was achieved. The cancellation rate decreased following PRP treatment while the number of collected oocytes, number of oocytes in metaphase II rose. The number of embryos (of A and B quality) resulting also increased but fell short of the significance level set (α=0.073). Following the PRP injection, two singleton pregnancies were achieved, resulting in live births at term without complications during pregnancy. Another pregnancy was achieved spontaneously 45 months following the PRP and a failed assisted human reproduction procedure. Although the group included a small number of women, the results indicate the potential benefits of an ovarian autologous PRP injection in women with POR. Positive results appear to be short-term for 2-6 months after the procedure., (Copyright © 2020, Spandidos Publications.)
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- 2021
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16. Pheochromocytoma as a rare hypertensive complication rarely associated with pregnancy: Diagnostic difficulties (Review).
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Pacu I, Zygouropoulos N, Furau CG, Navolan D, Tit DM, Ionescu CA, Stoian AP, Petca A, and Dimitriu M
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This review provides a brief clinically relevant review of pheochromocytoma in pregnancy, to raise awareness among doctors in obstetrics and the aim is to serve as the first point of reference when confronted by their presence. Pheochromocytomas are neuroendocrine, catecholamine-secreting tumours. Despite having the highest incidence rate among other hormone-secreting adrenal tumours, they remain rare especially when associated with pregnancy. The non-specific presentation of pheochromocytomas, the difficulties in their diagnosis during pregnancy as well as the high maternal and fetal mortality rates associated with them, present a challenge. Clinical suspicion and meticulous patient history-taking remain the primary lines of defense, while biochemical proof of catecholamine excess (or their metabolites) and imaging-based localisation of the tumour are required for diagnosis. Antenatal diagnosis and complete localisation of the tumour increase the likelihood of successful outcomes for both mother and newborn. Magnetic resonance imaging (MRI) remains the method of choice during pregnancy without excluding the use of ultrasound. Treatment goals should include the avoidance of hypertensive crises while maintaining adequate uteroplacental circulation. The target blood pressure is not strictly defined but is in line with the general guideline addressing chronic hypertension during pregnancy. Antihypertensive medications remain the cornerstone in managing pheochromocytoma. As a first-line, the α-adrenergic, nonselective antagonist phenoxybenzamine is the most frequently used agent, while α1-selective adrenergic antagonists with or without the addition of β- or β1-blockers are also prescribed in certain cases, rendering calcium channel blockers as 'second-choice'. Blood-pressure control of the mother and the well-being of the fetus are determining factors in deciding the time of delivery, which is preferably conducted by Caesarean section. Excision of the tumour(s) remains the final treatment goal. Lifelong biochemical testing is required with or without medical treatment, to address mineralocorticoid or glucocorticoid deficits. Despite ever-improving positive outcome rates, pheochromocytoma associated with pregnancy remains a pathology with high mortality and morbidity rates., Competing Interests: The authors declare that they have no competing interests., (Copyright © 2020, Spandidos Publications.)
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- 2021
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17. Obstetrical Soft Tissue Trauma during Spontaneous Vaginal Birth in the Romanian Adolescent Population-Multicentric Comparative Study with Adult Population.
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Matei A, Poenaru E, Dimitriu MCT, Zaharia C, Ionescu CA, Navolan D, and Furău CG
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- Adolescent, Adult, Case-Control Studies, Child, Delivery, Obstetric, Female, Humans, Pregnancy, Retrospective Studies, Risk Factors, Romania epidemiology, Obstetric Labor Complications, Perineum
- Abstract
Romania is a country with high rates of adolescent births, associating scarce comprehensive obstetrical management with this specific population. This research aims to assess soft tissue trauma after vaginal birth in teenage mothers compared to their adult counterparts. A retrospective case-control study was conducted for one year in two hospitals. All vaginal deliveries were considered; the age cut-off value was considered at 20 years old for case and control groups. Lacerations were divided into three subgroups, considering the involved anatomical region; group I: labial and periurethral lacerations, group II: vaginal and perineal lacerations, and group III: cervical lacerations. There were 1498 women included in the study: 298 young mothers and 1200 adults. Teenagers were more likely to have an episiotomy during vaginal delivery compared to adult women: 56% versus 26.7% ( p = 0.00, Pearson Chi-square) and a 1.89 times increased risk for developing additional group II lacerations: p = 0.01, Pearson Chi-square test with Bonferroni correction: OR = 1.89, 95% CI: 1.18-3.02. Group II lacerations were the most frequent type of birth trauma in both study groups. Fetal weight ≥4000 g was associated with a two times higher risk for vaginal and perineal lacerations when age criterion was not considered (OR = 1.98, 95% CI: 1.13-3.47, p = 0.01). The incidence of group I and II lacerations increased with age: from 0% and 9.1% between 10 and 14 years old to 6% and 26.2% between 18 and 19 years old. All groups of lacerations were more often identified in the case group, compared to the adult group. Fetal macrosomia and spontaneously ruptured membranes at admission could not be documented as risk factors for obstetrical injury in young mothers. Episiotomy performed in teenagers was not a protective procedure for group II lacerations.
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- 2021
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18. Investigating Caesarean Section Practice among Teenage Romanian Mothers Using Modified Robson Ten Group Classification System.
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Matei A, Dimitriu MC, Roșu GA, Furău CG, and Ionescu CA
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- Adolescent, Female, Humans, Infant, Newborn, Labor Presentation, Parity, Pregnancy, Romania epidemiology, Cesarean Section, Mothers
- Abstract
The Robson ten-group classification system is a recognized effective method of assessing caesarean rate. It is based on dividing patients into ten mutually exclusive groups, focusing on six maternal and newborn variables (parity, gestational age, plurality, foetal presentation, previous caesarean, and mode of labour onset). The aim of our analysis was twofold: first, to present the implementation of Robson classification in a pregnant teenage population; and second, to identify the indications for CS in the adolescent population. This study was designed as a one-year prospective analysis and considered all women younger than 20 years of age who delivered in a tertiary care hospital. Before discharge, women who had caesarean delivery responded to a questionnaire regarding their education, prenatal surveillance, and obstetrical history. Caesarean sections accounted for 47.01% of all births. A proportion of 24.57% of the participants had at least one previous caesarean section. Group 10 (all women with a single cephalic preterm pregnancy) was second most often identified among women in middle adolescence (14.03%); 32.20% of the participants in late adolescence were in group 5 (multiparas with a scarred uterus, single cephalic term pregnancy). Differences between the two age groups were not statistically different ( p = 0.96). Abnormal cardiotocographic findings (38.23%), the arrest of descent (19.11%) and arrest of dilation (19.11%), were the most frequent indications for caesareans in Robson group 1. Neonates from mothers in Robson groups 8 (women with a multiple pregnancy) and 7 (multiparas single breech pregnancy) had the most unfavourable outcomes regarding gestational age at delivery and admission to the intensive care unit. We concluded that future focus on obstetrical management is mandatory in Robson groups 7 and 8. Adolescents in Robson group 1 (nulliparas, single cephalic term pregnancy, spontaneous labour) are the primary beneficiaries of strategies to reduce caesarean sections rates.
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- 2021
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19. Assessment of Postpartum Depression in Adolescents Who Delivered during COVID-19 Social Restrictions: The Experience of a Tertiary Hospital from Bucharest, Romania.
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Matei A, Dimitriu MCT, Cirstoveanu CG, Socea B, and Ionescu CA
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In the context of the viral spread of COVID-19 in 2020, Romanian authorities declared national confinement for two months. Our country faces a public health issue regarding adolescent pregnancy. This study assessed the predisposition of teenage mothers to postpartum depression and the influence of the viral pandemic on their emotional status. This study enrolled patients 10 to 19 years old who delivered in our department between March-December 2020. Teenagers were attributed to the "lockdown group" ( n = 30) and the "open group" ( n = 171). All study participants agreed to take an interview based on a three-part questionnaire, including the Edinburgh Postnatal Depression Scale (EPDS). In the "lockdown group", 16.67% of patients felt stressed over the last year compared to 11.11% of individuals in the "open group", but there was no statistically significant difference between groups regarding overall EPDS scores (z value 0.51, Mann-Whitney U test). Predictable variables for postpartum depression were the use of cigarettes (OR = 1.08, 95% CI: 1.00-1.16), intended pregnancies (OR = 0.25, 95% CI: 0.09-0.68, p = 0.007) and absence of stressors in the last year (OR = 0.07, 95% CI: 0.02-0.30, p = 0.0002). More adolescents were stressed during confinement compared to those who delivered in the following time period; this aspect did not interfere with depression screening scores. A planned pregnancy, even during adolescence, can serve as a protective factor for postpartum depression.
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- 2021
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20. Conceptual Model for Integrating Environmental Impact in Managerial Accounting Information Systems.
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Stanescu SG, Cucui I, Ionescu CA, Paschia L, Coman MD, Nicolau NLG, Uzlau MC, and Lixandru ML
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- Environment, Information Systems, Models, Theoretical, Accounting
- Abstract
The main research objective is to develop a conceptual accounting model to reflect the environmental impact generated by the economic activity of Romania's entities. In order to identify the current stage of the use of environmental accounting by the Romanian economic entities, the questionnaire used was based on a random sample of 377 entities whose economic activity has a significant impact on the environment. The results suggest the need to develop a model for integrating environmental impact into accounting. The model is based on the description of the technological process and determination of the environmental impact on each activity, stage, or procedure of the technological process, which enterprise will integrate its monetary value in the cost of production and will reflect it in the management accounting system, using specific environmental accounting instruments. The model involves five stages, and by combining internal and external information provided by environmental management accounting is a relevant source for substantiating decisions to promote environmental responsibility in Romanian companies.
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- 2021
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21. Factors affecting the decision to undergo abortion in Romania: Experiences at our clinic.
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Ples L, Popescu I, Margarit I, Ionescu CA, Cazaceanu A, Moga MA, Popescu M, Tomescu DR, and Sima RM
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- Adult, Cohort Studies, Family Planning Services, Female, Humans, Pregnancy, Prospective Studies, Romania, Abortion, Induced
- Abstract
Rationale, Aims, and Objectives: It is estimated that 25% of pregnancies worldwide end in induced abortion. In Romania, the abortion situation shows a specific pattern. Following the fall of the communist regime, first-trimester abortions were legalized, and between 1990 and 1992, the country's abortion rate was the highest in the world, with 182 abortions per 1000 women of reproductive age. However, there are currently no statistically reliable data, as some abortions are not reported. The purpose of this study was to identify the main circumstances that determine the choice to undergo abortion with all related potential risks, rather than using contraception., Method: We conducted a prospective type 1 cohort study based on a Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) Statement that included women who presented at Bucur Maternity, Saint John Hospital, Bucharest, for abortion during the first trimester, between July and December 2018. The patients were asked to complete a 21-item questionnaire based on psychosocial data., Results: The study included 119 patients, with a mean age of 29.57 years. Their educational level was average (ie, 51.3%, 4.2%, and 8.4% had completed high school, elementary school, and college or university, respectively). Most women were married (46.2%), and 47.9% were unemployed. The main reason for deciding to undergo an abortion was poverty (P = .014), and guilt was correlated with this decision (P = .004)., Conclusion: The profiles of the women who chose to undergo an abortion as a family planning method were as follows: in the third decade of life, resident of urban areas, married, unemployed, and with a low family income. The main reasons for abortion were financial status, advanced maternal age, incompatibility of pregnancy with future plans, and the desire to postpone conception., (© 2019 John Wiley & Sons, Ltd.)
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- 2020
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22. Novel diagnosis of mesenteric endometrioma: Case report.
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Sima RM, Radosa JC, Zamfir R, Ionescu CA, Carp D, Iordache II, Stănescu AD, and Pleş L
- Subjects
- Adult, Asymptomatic Diseases, Female, Humans, Incidental Findings, Tissue Adhesions diagnosis, Tissue Adhesions surgery, Treatment Outcome, Dissection methods, Endometriosis diagnosis, Endometriosis diagnostic imaging, Endometriosis pathology, Endometriosis surgery, Laparoscopy methods, Mesenteric Cyst diagnostic imaging, Mesenteric Cyst pathology, Mesenteric Cyst surgery, Ovarian Cysts diagnostic imaging, Ovarian Cysts pathology, Ovarian Cysts surgery
- Abstract
Rationale: Mesenteric cysts are benign gastrointestinal cystic lesions, with an incidence of <1/100 000. They usually develop in the small bowel mesentery, mesocolon (24%), retroperitoneum (14.5%), and very rarely originate from the sigmoid mesentery. Endometriomas represent a localized type of endometriosis and are usually within the ovary. Our case is unique because there are no reports in the literature of endometrial mesenteric cysts., Patient Concerns: We present a case of a 29-year-old woman who underwent a routine gynecologic control., Diagnosis: Clinical examination and imaging identified 2 endometriomas on the left and posterior to the uterus., Interventions: The patient underwent exploratory laparoscopy. Unexpectedly, a 10 cm mesenteric cyst was identified; this was associated with adhesions in the left adnexal area and a left ovarian endometrioma. The classic surgical approach which was necessary identified the mesenteric cyst with cranial mesosigmoid and ileal adhesions, as well as distal adhesions which included the uterus, ileum, left ovarian endometrioma, left hydrosalpinx, left ureter, and rectum. The cyst was removed completely and a left adnexectomy was performed because of the presence of the endometrioma and adhesions., Outcomes: The patient's outcome was favorable, with discharge at 72 hours after surgery. The histopathological report revealed that both the mesenteric and ovarian cysts were endometriomas., Lessons: Our case is unusual in that a mesenteric cyst was identified in a patient with no clinical symptoms. Furthermore, the histopathological examination revealed the endometriotic origin of the mesenteric cyst which has not previously been reported in the literature.
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- 2019
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23. The wide spectrum of ultrasound diagnosis of holoprosencephaly.
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Ionescu CA, Vladareanu S, Tudorache S, Ples L, Herghelegiu C, Neacsu A, Navolan D, Dragan I, and Oprescu DN
- Subjects
- Brain diagnostic imaging, Brain embryology, Databases, Factual, Female, Humans, Male, Pregnancy, Prevalence, Retrospective Studies, Sex Factors, Holoprosencephaly diagnostic imaging, Holoprosencephaly embryology, Ultrasonography, Prenatal methods
- Abstract
Aim: Holoprosencephaly (HPE) is the most common brain malformation. A wide spectrum of anatomical variants are characterized by a lack of midline separation of the cerebral hemispheres. The aim of this study was to assess the ultrasound diagnostic criteria for HPE., Material and Method: A database of 175 fetuses with central nervous system anomalies identified by ultrasound was collected retrospectively from 2006 to 2016 in this multicenter, retrospective, observational study. Among them 18 cases (10.2%) with HPE were identified., Results: The prevalence of HPE was 2.5:10.000 with the sex distributionmale:female of 1:1.6. Six cases were alobar subtype, 3 were semilobar, 7 were lobar and 2 were middle interhemispheric variant. In the second trimester, we consider that the abnormal fusion of the lateral ventricles and the absence of the cavum septum pellucidum are the most important landmarks for HPE. Facial abnormalities varied considerably., Conclusion: This study illustrates the heterogeneity of HPE with different cerebral and facial appearances.
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- 2019
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24. A multicenter cross-sectional study of episiotomy practice in Romania.
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Pasc A, Navolan D, Pușcașiu L, Ionescu CA, Szasz FA, Carabineanu A, Dimitriu M, Călin D, Bohilțea R, Ples L, and Nemescu D
- Subjects
- Cross-Sectional Studies, Delivery, Obstetric, Female, Humans, Models, Statistical, Poisson Distribution, Pregnancy, Prevalence, Romania, Young Adult, Episiotomy trends, Practice Patterns, Physicians'
- Abstract
Rationale, Aims, and Objectives: The aim of this study was to focus attention on episiotomy practice in Romanian maternity units in order to identify factors associated with the very high rate of the procedure in Romania and to consider strategies to reduce it., Methods: In this clustered cross-sectional study, a total of 11 863 patients were recorded in eight Romanian maternity units to assess the prevalence of episiotomy. A random effects Poisson model was used to estimate the prevalence rate in univariate and multivariate models., Results: Among the 11 863 patients included for analysis, 8475 (71.4%) had an episiotomy. The prevalence of episiotomy was 92.7% for the first vaginal birth, 73.2% for the second vaginal birth, and 35% for the third vaginal birth. The overall rate of suturing was higher than the episiotomy rate for all patients (total rate 79.2%). The likelihood of exiting the maternity ward with an intact perineum after the first vaginal birth was less than 5% at the first vaginal birth., Conclusions: In conclusion, routine episiotomy is the norm in Romanian maternity units, with episiotomy rates among the highest in Europe. Episiotomy use is mainly driven by local professional norms, experiences, previous training, and practitioners' decisions rather than evidence, guidelines, or variations in patient needs at the time of vaginal birth., (© 2018 The Authors Journal of Evaluation in Clinical Practice Published by John Wiley & Sons Ltd.)
- Published
- 2019
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25. Defensive caesarean section: A reality and a recommended health care improvement for Romanian obstetrics.
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Ionescu CA, Dimitriu M, Poenaru E, Bănacu M, Furău GO, Navolan D, and Ples L
- Subjects
- Adult, Attitude of Health Personnel, Elective Surgical Procedures, Female, Humans, Patient Preference statistics & numerical data, Patient Selection, Physicians standards, Pregnancy, Qualitative Research, Referral and Consultation, Risk Management organization & administration, Romania, Cesarean Section legislation & jurisprudence, Cesarean Section methods, Cesarean Section trends, Malpractice legislation & jurisprudence, Malpractice statistics & numerical data, Obstetrics methods, Obstetrics standards, Risk Management methods
- Abstract
Rationale: Defensive caesarean section (CS) has become one of the most common medical procedure worldwide. Additionally, performing CS in accordance with the patient's choice is an appropriate professional practice., Aims and Objective: This paper reports a prospective, observational, multicenter study to quantify the use of this type of practice that is performed by obstetricians to avoid medico-legal complaints and decrease the frequency of malpractice litigations., Methods: We interviewed 73 obstetricians from three distinct units of obstetrics and gynaecology, to assess their opinion regarding defensive caesarean delivery and caesarean delivery performed upon maternal request. We conducted an opinion-based survey using questionnaires based on nine, close-ended questions., Results: Out of 73 respondents, 51 (69.9%) stated that they perform defensive CS; 63 (86.3%) declared that their choice of birth delivery is influenced by the risk of being accused of malpractice; 60 (82.2%) indicated that it is normal for the patient to be able to decide on the type of delivery; and 63 (86.3%) declared that they consult their patients regarding their delivery preferences. We found statistically significant differences between the respondents who declare that they perform defensive CS (69.9%) and those who said that they are influenced by the risk of malpractice when they choose the method of delivery for their patients (86.3%) (P < .001; McNemar Test)., Conclusions: The results of our study indicate that defensive caesarean section is a widespread practice among obstetrics practitioners in Romania., (© 2018 The Authors Journal of Evaluation in Clinical Practice Published by John Wiley & Sons Ltd.)
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- 2019
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26. The problems associated with adolescent pregnancy in Romania: A cross-sectional study.
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Dimitriu M, Ionescu CA, Matei A, Viezuina R, Rosu G, Ilinca C, Banacu M, and Ples L
- Subjects
- Adolescent, Cross-Sectional Studies, Female, Humans, Needs Assessment, Patient Acceptance of Health Care, Pregnancy, Risk Assessment methods, Risk Factors, Romania epidemiology, Socioeconomic Factors, Young Adult, Adolescent Behavior, Cesarean Section statistics & numerical data, Pregnancy in Adolescence prevention & control, Pregnancy in Adolescence statistics & numerical data, Prenatal Care methods, Prenatal Care standards
- Abstract
Rationale: The extent of pregnancy in adolescents and young adults, especially in low and middle-income countries, is a source of increasing concern given its social and economic impact., Aims and Objective: We hypothesized that there would be correlations between female patients becoming pregnant at a young age and practices such as harmful alcohol misuse, cigarette smoking, and drug use, the use of toxic substances, low educational attainment, and an essential absence of health care seeking about the outcome of adolescent pregnancies., Methods: We performed a prospective cross-sectional study of patients who gave birth between August and November 2017 at St. Pantelimon Emergency Hospital in Bucharest, Romania. Seventy-four patients aged 14 to 20 years, with a mean maternal age of 18.07 years, were enrolled in the study and answered a 15-item questionnaire about their social, educational, and medical background., Results: Fifty-three patients (71.6%) gave birth by caesarean section and 21 (28.3%) by vaginal delivery. Notably, patients aged 14 to 16 years had a lower rate of caesarean delivery compared with those aged 17 to 20 years. Moreover, 83.0% of the caesarean sections and 76.1% of the vaginal deliveries were at term. With reference to age and type of delivery, women are more likely to give birth by caesarean section at any age group (the association is not statistically significant at P < .05), except for the age of 15 years (five out of six patients in our sample had a spontaneous birth). Smoking was the most common risk behavior in the sample (45.9%, n = 34), followed by alcohol consumption (17.5%, n = 13) and drug use (5.40%, n = 4)., Conclusions: A high percentage of caesarean delivery was reported, particularly in patients aged >17 years. The percentage of female participants who underwent a caesarean delivery for their second pregnancy was significantly higher than compared with primipara participants. Patients receiving consistent antenatal care visits compared with those who did not monitor their pregnancy did not differ in the likelihood of undergoing a caesarean section., (© 2018 John Wiley & Sons, Ltd.)
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- 2019
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27. A rare case of synchronous ovarian tumors: clinical case report and literature review.
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Roşu GA, Furău GO, Ionescu CA, Dimitriu MCT, Neacşu A, Ioan RG, Călin FD, Matei A, Bănacu M, Popescu I, Gheorghiu D, Neacşu I, Bacalbaşa N, and Furău CG
- Subjects
- Adenocarcinoma pathology, Colon, Sigmoid pathology, Colon, Sigmoid surgery, Colonic Neoplasms pathology, Female, Humans, Middle Aged, Neoplasms, Multiple Primary pathology, Ovarian Neoplasms pathology
- Abstract
Epithelial ovarian carcinoma makes up 90-95% of all ovarian malignancies, taking into account also low-malignant-potential tumors. The Krukenberg tumor is a rare metastatic adenocarcinoma (ADK) in the ovary, representing 1-2% of ovarian tumors. Multiple primary malignant neoplasms may exist when more than one cancerous tumor is diagnosed in the same or a different organ. The incidence of multiple primary cancers among malignancies is between 2.4% to 8%. The aim of this paper is to report the case of a 47-year-old patient with two synchronous malignant tumors involving both ovaries, one diagnosed as primary papillary serous cystadenocarcinoma and the other one diagnosed as ovarian metastasis (Krukenberg tumor) of a synchronous colorectal ADK, and the complex diagnostic and therapeutic challenges that such a rare case poses. Histopathological (HP) examination and especially the immunohistochemical analysis had a determining role in differentiating between an ovarian primary tumor and a metastasis from a gastrointestinal tract cancer. The tumors examination for somatic mutations of Kirsten rat sarcoma viral oncogene homolog (KRAS) and neuroblastoma RAS viral oncogene homolog (NRAS) genes was performed in order to individualize the chemotherapic treatment in this difficult case. The conclusion of this case is that, although synchronous multiple primary cancers in a young patient are a rare condition, this situation should be taken into account in the differential diagnosis when we encounter clinical and HP diagnostic challenges.
- Published
- 2019
28. Three-dimensional scan of the uterine cavity of infertile women before assisted reproductive technology use.
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Pleş L, Alexandrescu C, Ionescu CA, Arvătescu CA, Vladareanu S, and Moga MA
- Subjects
- Adult, Female, Humans, Infertility, Female congenital, Infertility, Female therapy, Mullerian Ducts abnormalities, Mullerian Ducts diagnostic imaging, Pregnancy, Pregnancy Rate, Retrospective Studies, Treatment Outcome, Urogenital Abnormalities complications, Uterus diagnostic imaging, Young Adult, Imaging, Three-Dimensional methods, Infertility, Female diagnostic imaging, Reproductive Techniques, Assisted statistics & numerical data, Ultrasonography methods, Urogenital Abnormalities diagnostic imaging, Uterus abnormalities
- Abstract
The primary objective was to assess the utility of routine 3-dimensional (3D) ultrasound in the evaluation of infertile women and to estimate the prevalence of uterine anomalies before the use of assisted reproductive technology (ART), using the European Society of Human Reproduction and Embryology and the European Society for Gynaecological Endoscopy classification system. A second objective was to assess the effect of uterine anomalies on the pregnancy rate in patients who underwent assisted reproductive techniques.We retrospectively studied 668 patients treated in the Department Obstetrics Gynecology and Neonatology "Sf Ioan" Clinical Emergency Hospital and in the Department of Medical and Surgical Specialties, Faculty of Medicine "'Transilvania" University of Brasov between July 2016 and February 2017 for subfertility. Patients were examined using 2-dimensional (2D) and 3-dimensional (3D) transvaginal ultrasound. Müllerian duct anomalies were present in 6.13% of patients, with the most common anomaly being a dysmorphic uterus (class U1c in 42.68% of patients), 17 patients (20.73%) with incompletely septate uterus (class U2a), 12 patients (14.63%) with a completely septate uterus (classU2b), 8 patients (9.75%) with a partly bicorporeal uterus (classU3a), and 6 patients (7.31%) with a completely bicorporeal uterus (class U3b). Only 1 (1.21%) patient had an aplastic uterus without a rudimentary cavity (class U5b). The pregnancy rate in the presence of uterine anomalies was 55% and the pregnancy rate in control group patients was 39.8%. The incidence of pregnancy in the group with uterine anomalies was statistically similar with the control group of normal uterus (P < .11). For ongoing pregnancy rate and live birth rate, our data indicated a slightly elevated rate for both of those indexes in the anomalies group. The incidence of miscarriage in the presence of uterine anomalies was 24% and 6.7% in the control group, which is statistically significant (P = .05).3D ultrasound evaluation of the uterus should be considered before ART in order to make an accurate diagnosis of the uterine congenital anomaly and improve ART results.
- Published
- 2018
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29. Correlation of ultrasound features and the Risk of Ovarian Malignancy Algorithm score for different histopathological subtypes of benign adnexal masses.
- Author
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Ionescu CA, Matei A, Navolan D, Dimitriu M, Bohâltea R, Neacsu A, Ilinca C, and Ples L
- Subjects
- Adolescent, Adult, Aged, Algorithms, Biomarkers, Tumor, CA-125 Antigen blood, Cysts diagnostic imaging, Cysts surgery, Diagnosis, Differential, Female, Humans, Laparoscopy, Middle Aged, Ovarian Diseases diagnostic imaging, Ovarian Diseases surgery, Ovarian Neoplasms diagnostic imaging, Ovary diagnostic imaging, Ovary pathology, Premenopause, Retrospective Studies, Risk Factors, Teratoma diagnostic imaging, Teratoma surgery, Young Adult, Cysts diagnosis, Ovarian Diseases diagnosis, Ovarian Neoplasms diagnosis, Ultrasonography methods
- Abstract
Ovarian masses are one of the most frequently identified entities in gynecological practice. Early differential diagnosis is a key factor in the medical management of each patient. Transvaginal ultrasound along with additional preoperative testing, such as serum cancer antigen 125 (CA-125) levels and the Risk of Ovarian Malignancy Algorithm (ROMA) score, usually provide sufficient information for a presumptive diagnosis. Minimally invasive surgery as a therapeutic approach is the standard procedure for uncomplicated and benign adnexal masses. Histopathological examination alone, or in conjunction with immunohistochemical testing establishes a more certain diagnosis in the final step of the patient management plan. We developed a retrospective descriptive observational study based on the evaluation of 107 patients admitted to the Department of Obstetrics and Gynecology at "Sf Pantelimon" Clinical Emergency Hospital in Bucharest between January 2000 and July 2017. Each patient was diagnosed with an ovarian mass and underwent laparoscopic surgery for treatment. All data underwent descriptive statistical analysis in order to establish correlations between preoperative test results and definitive diagnoses. The typical ultrasound findings of endometriotic cysts were histopathologically confirmed in 52.6% of the examined patients. Using ultrasound, benign teratomas were suspected in 66.6% of all documented dermoid cysts and 90% of the patients with a calculated ROMA score had corresponding values less than 15%. Mean CA-125 value was 26.58 U/mL. Laparoscopic surgery with ovarian cystectomy was performed for 78.5% of the cases. Histopathological examinations established endometriosis was present in 26.16% of cases. According to an independent samples t test (with 2 extreme values eliminated), patients in the premenopausal group had a significantly lower mean ROMA score than postmenopausal patients (6.87% vs 20.98%, respectively; P < .001). The groups had similar homogeneity (P = .131 according to the Levene test). Our results showed that transvaginal ultrasound established a presumptive diagnosis for almost half of our patients. Cystectomy was the main surgical procedure used for the management of benign ovarian masses. Endometriosis was the most common benign ovarian pathology evaluated and treated in our study.
- Published
- 2018
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30. Alobar holoprosencephaly associated with a rare chromosomal abnormality: Case report and literature review.
- Author
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Ionescu CA, Calin D, Navolan D, Matei A, Dimitriu M, Herghelegiu C, and Ples L
- Subjects
- Brain abnormalities, Brain diagnostic imaging, Chromosome Disorders complications, Chromosomes, Human, Pair 18 genetics, Craniosynostoses complications, Craniosynostoses diagnosis, Delivery, Obstetric methods, Female, Gestational Age, Holoprosencephaly complications, Humans, Infant, Newborn, Karyotype, Magnetic Resonance Imaging methods, Microcephaly complications, Microcephaly diagnosis, Mosaicism, Pregnancy, Ultrasonography, Prenatal methods, Abnormalities, Multiple diagnosis, Chromosome Disorders diagnosis, Holoprosencephaly diagnosis
- Abstract
Rationale: Holoprosencephaly is a structural malformation of the brain that results from the complete or incomplete noncleavage of the forebrain of the embryo into 2 hemispheres. We report a severe case of alobar holoprosencephaly diagnosed at 38 weeks, associated with cebocephaly, microcephaly, and craniosynostosis., Patient Concern: The main knowledge added by this case is the late ultrasound diagnosis and chromosomal analysis that revealed a very rare abnormality (45X/46,XX/47,XX) with mosaicism at chromosome 18., Diagnoses: Investigation of the mother revealed nothing remarkable from clinical point of view and on laboratory tests. Ultrasonography identified a fetal biometry appropriate for gestational age, except for the head biometry and abdominal circumference, that were appropriate for less than the fifth percentile. Microcephaly, a large midline monoventricle, absent midlinestructures, cleft lip, cebocephaly (hypotelorism, single-nostril nose), ethmocephaly (hypotelorism, interorbital proboscis) and craniosynostosis, were also present. Fetal magnetic resonance imaging of fetus revealed an absent midline structure, a central monoventricle, abnormal corpus calosum, and abnormal gyri., Interventions: A cesarean section at 38 weeks was indicated for fetal bradycardia and a female baby was delivered, with Apgar score 6, weight 2290g. After birth, the diagnosis of the fetus confirmed holoprosencephaly with facial anomalies and demonstrated repeated tonic-clonic seizure, severe respiratory failure, cyanosis, decreased muscle tone, palor, and apnea. Laboratory examination of the newborn revealed acidosis and a prolonged of prothrombin time. The neonate was treated for severe respiratory distress syndrome, with immediate intubation and resuscitation. Vitamin K, fresh frozen plasma, and antibiotics were also administered., Outcomes: After delivery, exitus of the fetus occurred at 3 days and 18hours due to massive pulmonary hemorrhage., Lessons: We described a case of alobar holoprosencephaly diagnosed at 38 weeks of gestation and associated with a rare chromosomal abnormality (45X/46,XX/47,XX) with mosaicism at chromosome 18. Emotional implications could have been less severe if the patient underwent regular ultrasonography allowing a diagnosis in the first or early second trimester.
- Published
- 2018
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31. Clinical and morphological correlations in early diagnosis of endometrial cancer.
- Author
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Neacşu A, Marcu ML, Stănică CD, Brăila AD, Pacu I, Ioan RG, Grigorescu CC, and Ionescu CA
- Subjects
- Adult, Aged, Early Detection of Cancer, Endometrial Neoplasms pathology, Female, Humans, Mass Screening, Middle Aged, Endometrial Neoplasms diagnosis
- Abstract
The prevalence of endometrial cancer among asymptomatic women is rather reduced also due to the absence of a cost-efficient test, as there are no ideal screening examinations for endometrial cancer. Several methods were proposed in medical practice to discover endometrial neoplasia at an early stage, among which: endometrial biopsy, endovaginal ultrasound, targeted biopsy hysteroscopy. This study was made on a group of 38 patients monitored for metrorrhagia in the interval between July 1, 2014-July 1, 2016. All patients were monitored clinically and by ultrasound, endometrium samples were taken by biopsied uterine curettage, and a histopathological examination was performed, completed by immunomarking, whenever necessary. The clinical and paraclinical methods allowed for the creation of a protocol by which patients were monitored. This protocol allowed for the modulation and effectiveness of the treatment, establishing the best therapeutic conduct and the remote supervision.
- Published
- 2018
32. UPA effects on endometrium - what is the significance?
- Author
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Pleş L, Sima RM, Carp D, Florescu C, Dimitriu MCT, and Ionescu CA
- Subjects
- Adult, Endometrium pathology, Female, Humans, Ki-67 Antigen metabolism, Middle Aged, Norpregnadienes administration & dosage, Receptors, Progesterone metabolism, Endometrium drug effects, Norpregnadienes pharmacology
- Abstract
Introduction: Selective progesterone receptor modulators (SPRMs), such as Mifepristone, Asoprisnil, Ulipristal acetate (UPA) and Vilaprisan, were tested for their antiproliferative effects on uterine fibroids. In Romania, despite the UPA availability, physicians remained reserved on the lack of experience and concerns about the safety of the drug on endometrium., Patients, Materials and Methods: We performed an observational study on premenopausal women with symptomatic uterine fibroids. The patients received UPA in doses of 5 mg for 12-13 weeks. The fibroids dimensions and endometrium thickness were recorded at before and after the treatment. The pathological samples were assessed by two pathologists, and they recorded progesterone receptor modulator associated endometrial changes (PAEC) as extensive PAEC (EPAEC), minimally PAEC (MPAEC), absent PAEC (APAEC) and Ki67 immunoexpression in endometrium., Results: A number of 57 women were introduced in our study and we had a dropout of one patient. The fibroid dimensions and endometrial thickness decreased after UPA. The pathological exam of the endometrium revealed: APAEC in 26.8% of cases, MPAEC in 60.7% of cases and EPAEC in 12.5% of cases. EPAEC were more frequent in patients with larger fibroids. PAEC had a strong correlation with Ki67 index (p≤0.01). PAEC were more frequent in older women (p≤0.01). Ki67 had a higher expression in EPAEC - mean: 69% (range: 63-75%), standard deviation (SD): 3.95., Conclusions: UPA treatment decreased fibroids dimension and improved patients' symptoms in our study. EPAEC was associated with abundant Ki67 antigen. UPA administration for three months is a safe method without endometrial atypia but longer protocols require extended studies about the proliferative potential of the endometrium.
- Published
- 2018
33. Endometrial stromal sarcoma in a 27-year-old woman. Case report and literature review.
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Călin FD, Gheorghiu D, Ionescu CA, Neacşu A, Navolan DB, Dimitriu MCT, Ionescu A, Constantin VD, Terzea DC, Marcean C, Pădure L, and Pacu I
- Subjects
- Adult, Female, Humans, Sarcoma, Endometrial Stromal pathology, Sarcoma, Endometrial Stromal diagnosis
- Abstract
Endometrial stromal tumors are very rare, representing approximately 0.2% of uterine malignancies, having an incidence of one to two from a million of women. The diagnosis cannot be established by imaging, it is histopathological only, often necessitate supplementary immunohistochemistry tests. We report the case of a 27-year-old woman who had an initial diagnosis, in another hospital, of uterine adenomyoma, established by dilatation and uterine curettage and then by subsequently histopathological exam. This diagnosis led to an initial non-oncological surgery, with interannexial total hysterectomy. The establishment of the final histopathological diagnosis of stromal endometrial sarcoma has led to a serious reassessment of the case. Making a review of the literature, we found very few cases of endometrial stromal sarcoma in young women less than 30 years old and we have not identified any clear strategy of treatment. However, from precautionary and considering that may be at risk, even with very few cases reported, the distance metastases can be present, sometimes at large intervals of time, we decided, for oncological safety, reintervention after one month. At the second surgery, it was practiced bilateral salpingo-ovarectomy, cardinal ligaments excision, partial omentectomy, bilateral pelvic lymphadenectomy extended lumbo-aortic and interaortico-cava, sampling biopsy from the inguinal femoral adenopathy and re-excision of the vaginal vault. The evolution was favorable, the patient being follow-up together with the oncologist specialist.
- Published
- 2018
34. Adnexal masses in pregnancy: perinatal impact.
- Author
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Oprescu ND, Ionescu CA, Drăgan I, Fetecău AC, Said-Moldoveanu AL, Chirculescu R, and Vlădăreanu S
- Subjects
- Adnexal Diseases diagnostic imaging, Adnexal Diseases pathology, Adult, Female, Humans, Ovarian Cysts diagnostic imaging, Pregnancy, Retrospective Studies, Adnexal Diseases diagnosis, Ovarian Cysts diagnosis
- Abstract
The incidence of adnexal masses in pregnancy has increased significantly over the last decades and this is mostly because of the widespread use of ultrasound for pregnancy surveillance. Although a clear majority of adnexal masses found in the first trimester are functional cysts, which have a small diameter and disappear spontaneously, those that do persist into the second and third trimester require ultrasound surveillance for proper management. The presence of a large adnexal mass in the third trimester of pregnancy represents solid grounds for delivery via Caesarean section (C-section) both because of the risk of dystocia and the advantage of one-step approach of cystectomy/oophorectomy at the time of C-section. This is a retrospective study of all the third trimester pregnancy related adnexal masses that delivered in our Hospital in the last 10 years via C-section where cystectomy was also performed. Our aim was to look at the histological type of ovarian mass and to compare our results to those previously published by other authors. We also wanted to see whether the clinical suspicion based on prenatal ultrasound aspect, where this was available, was similar to the postnatal histology report. Secondary outcomes were gestational age at delivery, fetal weight and Apgar score. We found that dermoid cysts are the most common type of adnexal mass with an incidence of 46%, followed by mucous cysts 27%, serous cysts 18% and endometrioses 9%, which is consistent with the data published by other authors in larger series. In terms of prenatal clinical diagnosis, detailed ultrasound assessment of the ovarian mass was available only in less than half of these cases, but in these, the clinical suspicion was confirmed by histology report. In our series, we had no case that required premature delivery because of adnexal mass-related complications and fetal outcome was very good with normal birth weight and high Apgar score. Although this is a small series of cases, it confirms the incidence previously published of the different histological types of ovarian tumors. It also shows that fetal outcomes are very rarely affected by the presence of ovarian masses and premature iatrogenic delivery for maternal well-being is the only note wordy one of them.
- Published
- 2018
35. Primary myelofibrosis and pregnancy outcomes after low molecular-weight heparin administration: A case report and literature review.
- Author
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Bohîlţea RE, Cîrstoiu MM, Ionescu CA, Niculescu-Mizil E, Vlădăreanu AM, Voican I, Dimitriu M, and Turcan N
- Subjects
- Adult, Cesarean Section, Drug Therapy, Combination, Female, Humans, Live Birth, Pregnancy, Treatment Outcome, Aspirin administration & dosage, Fibrinolytic Agents administration & dosage, Heparin, Low-Molecular-Weight administration & dosage, Pregnancy Complications drug therapy, Primary Myelofibrosis drug therapy
- Abstract
Rationale: Primary myelofibrosis is encountered with the myeloproliferative diseases and is the least prevalent among women of childbearing age. The prognosis is guided by pancytopenia, leukemic transformation and thrombosis which are the dominant complications., Patient Concerns: Data regarding protocol management during pregnancy in the context of myelofibrosis are insufficient. Fewer than ten cases have been described until now and half of this cases have resulted in fetal death due to placental infarction during the second and third trimesters., Diagnoses: We present the case of a 34-year-old pregnant woman diagnosed with Jak 2- negative primary myelofibrosis. Personal history did not include miscarriage or stillbirth., Interventions: The patient was previously treated with anagrelide hydrochloride, which was interrupted at 6 weeks of gestation when the pregnancy was confirmed. It was replaced with Interferon-a 3 MU/day. Because of severe thrombocytosis, administration of aspirin 150 mg/day was recommended., Outcomes: The pregnancy was uneventful. The patient was hospitalized at 33 weeks of gestation because of moderate vaginal bleeding and high risk of preterm birth. After a specialized hematological investigation, the treatment with aspirin was replaced with low-molecular-weight heparin 0.6 ml per day. This combined treatment assisted in the natural tendency to lower platelet counts during pregnancy and resulted in stabilization of the hematological status. At 38 weeks of gestation the patient delivered a healthy baby boy via cesarean. He weight 2850 grams and his Apgar score was 9. Anticoagulant and interferon treatments were continued post-partum under hematologist surveillance., Lessons: This case was rare and complex. Because it was related to pregnancy it required continuos collaboration and supervision between obstetrician and hematologist.
- Published
- 2017
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36. Present tendencies of elective caesarean delivery in Romania: Geographic, social and economic factors.
- Author
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Ionescu CA, Ples L, Banacu M, Poenaru E, Panaitescu E, and Traian Dimitriu MC
- Subjects
- Apgar Score, Cities, Economics, Female, Humans, Infant, Newborn, Pregnancy, Principal Component Analysis, Romania, Socioeconomic Factors, Cesarean Section trends, Defensive Medicine, Geography, Liability, Legal, Patient Preference
- Abstract
The literature review was conducted to identify the causes of the rising incidence of caesarean section (CS) cases in Romania, and to create a database and a measurement plan to quantify the amount of CS on maternal request and the influence of geographical, social and economic factors. The review was conducted at the Department of Obstetrics and Gynaecology Clinical Emergency Hospital Sf Pantelimon, Bucharest, and comprised figures of clinical records of all patients who underwent CS between 2009 and 2014. The results showed an increase in the number of CS on maternal requests. In 2014 it reached a rate of 36.90 cases in every 100 newborn infants, which was 2.62% higher than 2013. Increasing rate of CS seemed to have resulted from a few factors, including the constant preoccupation to improve the obstetrical field in Romania; its services; the prophylactic measures in obstetrics; the trials to prevent the fear of the obstetrical malpraxis and its risks and consequences; and the fact that some obstetricians have done multiple CS deliveries on maternal requests.
- Published
- 2017
37. Antenatal diagnosis and prognostic factors of aneurysmal malformation of the vein of Galen: A case report and literature review.
- Author
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Herghelegiu D, Ionescu CA, Pacu I, Bohiltea R, Herghelegiu C, and Vladareanu S
- Subjects
- Adult, Fatal Outcome, Female, Humans, Infant, Newborn, Male, Pregnancy, Pregnancy Outcome, Pregnancy Trimester, Second, Prognosis, Imaging, Three-Dimensional, Ultrasonography, Doppler, Color, Ultrasonography, Doppler, Pulsed, Ultrasonography, Prenatal, Vein of Galen Malformations diagnostic imaging
- Abstract
Rationale: Vein of Galen aneurysmal malformation (VGAM) is a rare complex malformation of the cerebral vascular system consisting of arteriovenous shunts between the vein of Galen and the cerebral arteries., Patient Concerns: We present the case of a 31-year-old pregnant woman, para 1, gravida 1., Diagnoses: At 26 weeks' gestation who was examined for an anechoic mass on the cerebral median midline with color and pulsed Doppler. She presented with positive flow on the color and pulsed Doppler test, associated with hydrocephalus, cortical hypoplasia, cardiomegaly, jugular vein distension., Interventions: No intervention for VGAM was done., Outcomes: This case of a VGAM was associated with negative prognostic factors., Lessons: The ultrasound color Doppler together with the 3D power Doppler allowed reconstruction of the vascular connections and of the relationship of these with other anatomical structures, which contributed to establishing the prognosis.
- Published
- 2017
- Full Text
- View/download PDF
38. An intrauterine contraceptive device: where did we find it after 29 years of insertion? A case report.
- Author
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Ples L, Sima RM, Moisei C, and Ionescu CA
- Subjects
- Female, Humans, Laparotomy, Middle Aged, Abdominal Pain diagnostic imaging, Abdominal Pain etiology, Abdominal Pain surgery, Ileum diagnostic imaging, Ileum surgery, Intrauterine Device Migration adverse effects, Intrauterine Devices adverse effects
- Abstract
Intrauterine contraceptive devices (IUCD) are one of the most popular and modern means of contraception used worldwide. Some described complications include perforation, infection and ectopic pregnancy. Herein we report an uncommon complication of IUCD: perforation and migration in the terminal ileum. A 56-year-old woman presented to our institution with lower abdominal pain. She had had an IUCD placed 29 years previously. The IUCD was inserted in unsafe conditions since then it was prohibited in Romanian to use any contraception device or pills. The IUCD was placed clandestinely in uncertain condition and could never be checked after. An exploratory laparotomy evidenced the presence of IUCD migrated to terminal ileum. A 56-year-old woman presented to our institution with lower abdominal pain. She had had an IUCD placed 29 years previously. The IUCD was inserted in unsafe conditions since at that time it was prohibited in Romania to use any contraceptive device or pills. The IUCD was placed clandestinely in uncertain condition and a follow-up could not have been performed. An exploratory laparotomy evidenced the presence of IUCD which had migrated to the terminal ileum. This case demonstrates an unusual localisation of an IUCD in the ileum, but the particularity is that we found it after 29 years of its insertion and and the patient had no specific gastrointestinal symptoms.
- Published
- 2017
39. Synchronous bilateral primary ovarian carcinoma - case presentation.
- Author
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Ionescu CA, Vlădăreanu S, Pleş L, Dimitriu MCT, Furău GO, Vlădescu TC, Călin AM, and Oprescu ND
- Subjects
- Adult, Cell Nucleus pathology, Female, Humans, Neoplasm Proteins metabolism, Neoplasm Recurrence, Local pathology, Neoplasms, Cystic, Mucinous, and Serous pathology, Neoplasms, Multiple Primary diagnostic imaging, Ovarian Neoplasms diagnostic imaging, Ovary diagnostic imaging, Ovary pathology, Tomography, X-Ray Computed, Neoplasms, Multiple Primary pathology, Ovarian Neoplasms pathology
- Abstract
Bilateral synchronous primary ovarian carcinoma, histopathologically identical or different is a rare entity encountered in clinical practice. We present the case of a 38-year-old patient who is admitted with the presence of a massive pelvic abdominal tumor formation of 45÷35÷25 cm occupying the lower pelvic and upper abdominal floor, reaching halfway distance between the umbilicus and sternum and lateral bilaterally in the two abdominal flanks until iliac wing. The mixed transabdominal÷transvaginal ultrasound and computed tomography (CT), establish the diagnosis of bilateral ovarian tumor. The CA-125 level is 1822 IU÷mL. The exploratory laparotomy identifies two distinct bilateral ovarian tumors, ascites liquid and pelvic and lumbo-aortic lymphadenopathy, thus the surgery involves hysterectomy with bilateral ovariectomy, pelvic and paraaortic lymphadenectomy and omentectomy. Histopathological and immunohistochemistry (IHC) diagnosis highlights a well-differentiated serous carcinoma on the left ovary and right ovary. The six-month check after surgery as well as the one-year check showed the efficiency of postsurgery chemotherapy and did not signal the presence of relapses. The particularity of this case lies in the presence of bilateral synchronous primary ovarian carcinoma, histopathologically and IHC indicated serous carcinoma present with a difficult differential diagnosis including clear cell carcinoma at a young patient.
- Published
- 2017
40. Ultrasound diagnostic of mesonephric paraovarian cyst - case report.
- Author
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Bohîlțea RE, Cîrstoiu MM, Turcan N, and Ionescu CA
- Subjects
- Adult, Female, Humans, Ovarian Cysts pathology, Ovarian Cysts surgery, Pregnancy, Ultrasonography, Ovarian Cysts diagnostic imaging
- Abstract
Paraovarian cysts are a rare pathology, constituting 10-20% of the adnexal masses. The origin can be represented by paramesonephric ducts (Hydatid cysts of Morgagni), vestiges of mesonephric ducts also represented by mesothelium, or neoplastic (cystadenomas or cystadenofibromas) that are mostly benign. Borderline or malignant paraovarian tumors are encountered less often. This article presents a case of paraovarian cyst in a 37-year-old patient, with a history of 2 pregnancies, completed by cesarean. The patient sought medical attention for an asymptomatic voluminous ovarian cyst, detected in a routine ultrasound scan. Laboratory tests and tumor markers were within normal limits. Transvaginal ultrasound and color Doppler revealed a cystic adnexal mass with 10 cm transonic, smooth, homogeneous content, avascular walls with no internal papillary projections, with a "hyperechoic line" sign of delimitation from the ovarian capsule, mostly visible when the adnexa was mobilized. The diagnostic and curative laparoscopic surgery was successful, followed by a quick recovery. The histopathological exam confirmed the benignity and the origin of the paraovarian cyst. The case was discussed in the context of the literature review concerning this pathology, drawing attention to the real possibility of differentiating ovarian from paraovarian cysts by ultrasound.
- Published
- 2016
41. Velamentous insertion of umbilical cord with vasa praevia: case series and literature review.
- Author
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Bohîlțea RE, Cîrstoiu MM, Ciuvica AI, Munteanu O, Bodean O, Voicu D, and Ionescu CA
- Subjects
- Adult, Female, Humans, Pregnancy, Ultrasonography, Prenatal, Umbilical Cord abnormalities, White People, Umbilical Cord diagnostic imaging, Vasa Previa diagnostic imaging
- Abstract
A velamentous umbilical cord is characterized by membranous umbilical vessels at the placental insertion site that are prone to compression and rupture, especially when they are located in the membranes covering the cervical os (vasa praevia). The velamentous insertion of the umbilical cord, with a reported incidence of 1% in singleton pregnancies and 15% in monochorionic twin gestations, has been associated with obstetric complications: fetal growth restriction, prematurity, congenital anomalies, low Apgar scores, fetal bleeding with acute fetal distress and placental retention. The pathogenesis is unknown, but the trophotropism theory is the most common and supported by the association of velamentous cord insertion and placenta praevia. The prevalence of vasa praevia is of approximately 1/ 2500 deliveries; the risk factors include the use of assisted reproductive technologies, low-lying placenta or placenta praevia, bilobed or succenturiate lobe placenta and multiple gestation. The diagnosis is rarely established before delivery and consequently the fetal mortality is extremely high. We report two cases of velamentous marginal umbilical cord insertion associated with vasa praevia (type 1 vasa praevia) and placenta praevia diagnosed during a routine mid-trimester fetal 2D ultrasound scan, color and power Doppler transvaginal ultrasound cervical assessment. The ultrasound examination revealed one umbilical vessel crossing the internal os of the cervix entering the placental margin and connecting to the subchorionic vasculature, remaining immobile when the uterus was shaken, the color Doppler imaging enhancing the identification of the vessel. The patients were admitted to the hospital in the third trimester and deliveries were planed and successfully performed at 38 weeks gestation, being confirmed by a macroscopic examination ultrasound diagnostic.
- Published
- 2016
42. Gestational choriocarcinoma after term pregnancy: a case report.
- Author
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Brătilă E, Ionescu CA, Vlădescu CT, Cîrstoiu MM, and Berceanu C
- Subjects
- Adult, Ascites pathology, Biopsy, Choriocarcinoma complications, Choriocarcinoma pathology, Female, Humans, Hysterectomy, Ovarian Neoplasms pathology, Ovarian Neoplasms secondary, Postpartum Period, Pregnancy, Prognosis, Tomography, X-Ray Computed, Trophoblasts pathology, Uterine Hemorrhage, Uterine Neoplasms complications, Uterine Neoplasms pathology, Vaginal Neoplasms complications, Vaginal Neoplasms pathology, Choriocarcinoma diagnosis, Placenta pathology, Pregnancy Complications, Neoplastic diagnosis, Uterine Neoplasms diagnosis, Vaginal Neoplasms diagnosis
- Abstract
Choriocarcinoma coexisting with or after a "normal" pregnancy has an incidence of one per 160 000 pregnancies. In case of choriocarcinoma after term pregnancy, early diagnosis by histopathological examination of the placenta is very important, the precocity of the diagnosis influencing the prognosis and tumor response to chemotherapy. In this paper, we report the case of a 29-year-old woman gravidity 2, parity 2, with metastatic choriocarcinoma after term pregnancy, diagnosed at four months after the delivery of a healthy baby. An episode of abundant vaginal bleeding occurred after four months from delivery. The local exam revealed a vaginal tumor whose pathological examination on biopsy samples was inconclusive. Subsequently, she was admitted in our clinic with abundant vaginal bleeding, severe anemia and fever. Abdominal ultrasonography revealed an intracavitary uterine tumoral mass with signs of myometrial invasion to the uterine serosa, strong Doppler signal and moderate ascites. Pulmonary X-ray and computed tomography scan excluded extrapelvic tumoral masses. The pretreatment human chorionic gonadotropin (HCG) level was 31 030 IU÷mL and her FIGO risk factor score was 8 (high-risk group). Total hysterectomy with bilateral salpingo-oophorectomy and omentectomy was performed as an optimal cytoreduction. Postoperative remaining lesions were represented by the metastasis located in the lower two-thirds of the vagina. Histopathological examination revealed uterine choriocarcinoma with ovarian metastasis. Postoperative was initiated four courses of polychemotherapy. Case evolution was favorable, with the normalization of the βHCG value in two months postoperative and complete remission of the vaginal metastasis in six weeks postoperative.
- Published
- 2015
43. Effect of calcium source on structure and properties of sol-gel derived bioactive glasses.
- Author
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Yu B, Turdean-Ionescu CA, Martin RA, Newport RJ, Hanna JV, Smith ME, and Jones JR
- Subjects
- Calcium chemistry, Calcium Chloride chemistry, Calcium Compounds chemistry, Glass chemistry, Nitrates chemistry, Phase Transition, Silicates chemistry
- Abstract
The aim was to determine the most effective calcium precursor for synthesis of sol-gel hybrids and for improving homogeneity of sol-gel bioactive glasses. Sol-gel derived bioactive calcium silicate glasses are one of the most promising materials for bone regeneration. Inorganic/organic hybrid materials, which are synthesized by incorporating a polymer into the sol-gel process, have also recently been produced to improve toughness. Calcium nitrate is conventionally used as the calcium source, but it has several disadvantages. Calcium nitrate causes inhomogeneity by forming calcium-rich regions, and it requires high temperature treatment (>400 °C) for calcium to be incorporated into the silicate network. Nitrates are also toxic and need to be burnt off. Calcium nitrate therefore cannot be used in the synthesis of hybrids as the highest temperature used in the process is typically 40-60 °C. Therefore, a different precursor is needed that can incorporate calcium into the silica network and enhance the homogeneity of the glasses at low (room) temperature. In this work, calcium methoxyethoxide (CME) was used to synthesize sol-gel bioactive glasses with a range of final processing temperatures from 60 to 800 °C. Comparison is made between the use of CME and calcium chloride and calcium nitrate. Using advanced probe techniques, the temperature at which Ca is incorporated into the network was identified for 70S30C (70 mol % SiO(2), 30 mol % CaO) for each of the calcium precursors. When CaCl(2) was used, the Ca did not seem to enter the network at any of the temperatures used. In contrast, Ca from CME entered the silica network at room temperature, as confirmed by X-ray diffraction, (29)Si magic angle spinning nuclear magnetic resonance spectroscopy, and dissolution studies. CME should be used in preference to calcium salts for hybrid synthesis and may improve homogeneity of sol-gel glasses.
- Published
- 2012
- Full Text
- View/download PDF
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