Guido Ambrosini

University of Padova, Padua, Veneto, Italy

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Publications (95)218.98 Total impact

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    ABSTRACT: To investigate whether antenatal recognition of small-for-gestational-age (SGA) fetuses with normal maternal and fetal Doppler values delivered after 34 weeks' gestation is associated with changes in the risk of adverse maternal and neonatal outcomes.
    Journal of ultrasound in medicine: official journal of the American Institute of Ultrasound in Medicine 10/2014; 33(10):1721-8. · 1.40 Impact Factor
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    ABSTRACT: The aim of this study was to assess the influence of glucose metabolism on the expression of glycosaminoglycans (GAGs) and proteoglycans (PGs) in pregnant women.
    Journal of Obstetrics and Gynaecology Research 06/2014; 40(6):1625-31. · 0.84 Impact Factor
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    ABSTRACT: Current evidence about in-vivo effects of HPV cannot definitively clarify the possible negative role of this worldwide common infection in early embryo development. However in-vitro evidence, seems to underline a possible negative effect of HPV in increasing blastocyst apoptosis and in reducing the endometrial implantation of trophoblastic cells. On these bases we believe that a new scientific approach is necessary to better understand the real role of male and female HPV infection in infertility and early pregnancy development.
    Reproductive Biology and Endocrinology 05/2014; 12(1):48. · 2.14 Impact Factor
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    ABSTRACT: To identify maternal/pregnancy characteristics, first trimester ultrasound parameters and biochemical indices which are significant independent predictors of large-for-gestational age (LGA)neonates. DESIGN:Observational crosssectional study. Fetal Medicine Unit, Department of Obstetrics and Gynecology, University of Udine. 72 singleton pregnancies presenting for screening for chromosomal abnormalities by nuchal translucency and maternal serum biochemistry at 11-14 weeks. Linear regression was applied to develop first trimester prediction models for LGA. Maternal height, parity, smoking, assisted conception and pregnancy-associated plasma protein-A were significant independent predictors of LGA. PAPP-A cut-off value expressed in MoM of 1.25 used for the study was chosen to obtain good sensitivity and specificity values. Prediction for birthweight deviations (LGA) is feasible using data available at the routine 11-14 weeks' examination.
    Minerva ginecologica. 04/2014;
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    ABSTRACT: Abstract A wide variety of sperm preparation protocols are currently available for assisted conception. They include density gradient separation and washing methods. Both aim at isolating and capacitating as much motile sperm as possible for subsequent oocyte fertilization. The aim of this study was to examine the effects of four commercial sperm washing buffers on sperm viability and capacitation. Semen samples from 48 healthy donors (normal values of sperm count, motility, morphology, and volume) were analyzed. After separation (density gradient 40/80%), sperm were incubated in various buffers then analysed for reactive oxygen species (ROS) production, viability, tyrosine phosphorylation (Tyr-P), cholera toxin B subunit (CTB) labeling, and the acrosome reaction (AR). The buffers affected ROS generation in various ways resulting either in rapid cell degeneration (when the amount of ROS was too high for cell survival) or the inability of the cells to maintain correct functioning (when ROS were too few). Only when the correct ROS generation curve was maintained, suitable membrane reorganization, evidenced by CTB labeling was achieved, leading to the highest percentages of both Tyr-P- and acrosome-reacted-cells. Distinguishing each particular pathological state of the sperm sample would be helpful to select the preferred buffer treatment since both ROS production and membrane reorganization can be significantly altered by commercial buffers.
    Systems biology in reproductive medicine 03/2014; · 1.85 Impact Factor
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    ABSTRACT: This study examined the possible involvement of carbonic anhydrase activation in response to an endometriosis-related increase in oxidative stress. Peripheral blood samples obtained from 27 healthy controls and 30 endometriosis patients, classified as having endometriosis by histological examination of surgical specimens, were analysed by multiple immunoassay and carbonic anhydrase activity assay. Red blood cells (RBC) were analysed for glutathionylated protein (GSSP) content in the membrane, total glutathione (GSH) in the cytosol and carbonic anhydrase concentration and activity. In association with a membrane increase of GSSP and a cytosolic decrease of GSH content in endometriosis patients, carbonic anhydrase significantly increased (P < 0.0001) both monomerization and activity compared with controls. This oxidation-induced activation of carbonic anhydrase was positively and significantly correlated with the GSH content of RBC (r = 0.9735, P < 0.001) and with the amount of the 30-kDa monomer of carbonic anhydrase (r = 0.9750, P < 0.001). Because carbonic anhydrase activation is implied in many physiological and biochemical processes linked to pathologies such as glaucoma, hypertension, obesity and infections, carbonic anhydrase activity should be closely monitored in endometriosis. These data open promising working perspectives for diagnosis and treatment of endometriosis and hopefully of other oxidative stress-related diseases.
    Reproductive biomedicine online 01/2014; · 2.68 Impact Factor
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    ABSTRACT: We investigated the role of foetal spine position in the first and second labour stages to determine the probability of OPP detection at birth and the related obstetrical implications. We conducted an observational-longitudinal cohort study on uncomplicated cephalic single foetus pregnant women at term. We evaluated the accuracy of ultrasound in predicting occiput position at birth, influence of fetal spine in occiput position during labour, labour trend, analgesia request, type of delivery, and indication to CS. The accuracy of the foetal spinal position to predict the occiput position at birth was high at the first labour stage. At the second labour stage, CS (40.3%) and operative vaginal deliveries (23.9%) occurred more frequently in OPP than in occiput anterior position (7% and 15.2%, resp.), especially in cases of the posterior spine. In concordant posterior positions labour length was greater than other ones, and analgesia request rate was 64.1% versus 14.7% for all the others. The assessment of spinal position could be useful in obstetrical management and counselling, both before and during labour. The detection of spinal position, more than OPP, is predictive of successful delivery. In concordant posterior positions, the labour length, analgesia request, operative delivery, and caesarean section rate are higher than in the other combination.
    BioMed Research International 01/2014; 2014:783598. · 2.71 Impact Factor
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    ABSTRACT: To show management of patients with breast lobular carcinoma in situ (LCIS). This study is the retrospective review of 65 patients, between 1996 and 2012, with isolated LCIS of the breast, evaluated through clinical examination, ultrasound, and mammography at the first examination and follow-up. In 53 patients (81.54%), clinical examination was negative. In 14/65 (21.54%) cases, ultrasound was positive and led to biopsy. The clusters of tiny calcifications were the predominant mammographic pattern (45 cases, 69.23%). Forty-six patients (70.77%) underwent surgical biopsy after guided stereotactic placement of metallic marker (hook-wire), 12 (18.46%) by stereotactic vacuum biopsy (SVB), 5 (7.69%) by core needle biopsy (CNB) under ultrasound guidance, two (3.08%) patients CNB with clinically palpable nodules. Fourteen (21.54%) women underwent a quadrantectomy or total mastectomy after the first diagnosis; in this latter group follow-up was negative. Among the 51 patients (78.46%) who did not undergo quadrantectomy or total mastectomy, five relapses occurred, respectively, three LCIS and two infiltrating ductal carcinomas (IDC). Follow-up ranged from 12 to 144 months. LCIS is a risk factor for invasive carcinoma and should be managed with careful follow-up, but if there is a discrepancy between pathology and imaging, surgical excision is mandatory.
    European journal of gynaecological oncology 01/2014; 35(2):157-62. · 0.58 Impact Factor
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    ABSTRACT: To assess the effectiveness of inside-out TVT-ABBREVO in the surgical treatment of female stress urinary incontinence (SUI) with mean two-year follow-up.
    Clinical and experimental obstetrics & gynecology 01/2014; 41(4):445-7. · 0.38 Impact Factor
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    ABSTRACT: Ovarian cancer is the fourth cause of death from cancer in women worldwide and the majority of its diagnoses is made in an advanced stage of the disease. Several sonographic scoring systems have been created for a better preoperative discrimination between benign and malignant pelvic masses. The aim of this study was to evaluate the performances of the Risk of the Malignancy Index 3 (RMI 3) and the Pelvic Masses Score (PMS).
    European journal of gynaecological oncology 01/2014; 35(4):421-4. · 0.58 Impact Factor
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    ABSTRACT: To evaluate DNA fragmentation in single sperm selected by both birefringence and motile sperm organelle morphology examination (MSOME) with a single instrument. Prospective study. University setting. Semen samples from 33 normozoospermic subjects. Birefringence and MSOME to distinguish different categories of sperm: nonbirefringent (category A), birefringent (category B), birefringent with nuclear vacuoles (category C), and birefringent with no nuclear vacuoles (category D). From each semen sample, sperm of any category were selected and further analyzed by TUNEL test. A total of 660 well-characterized sperm were evaluated for DNA fragmentation. Category A showed a low percentage of sperm with normal MSOME results (19.4%) and high prevalence of DNA fragmentation (70.3%). Category B had 81.8% normal MSOME results, and in this group 31.8% had fragmentated DNA. Category C showed 31.8% and 92.6% DNA fragmentation in sperm with small and large nuclear vacuoles, respectively. Birefringent sperm with normal MSOME results and no vacuoles showed the lowest percentage of fragmented DNA (2.8%). Sperm selection by birefringence or MSOME alone had one-third probability to select sperm with fragmented DNA. The lowest percentage of DNA fragmentation was found in birefringent sperm with no nuclear vacuoles and normal MSOME results. We suggest combining both methods using a single microscope and selecting sperm without nuclear vacuoles to get sperm with a higher chance of having intact DNA.
    Fertility and sterility 12/2013; · 3.97 Impact Factor
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    ABSTRACT: Women with a history of hypertension in pregnancy are at increased risk of microalbuminuria later in life. Microalbuminuria is a marker of kidney dysfunction frequently related to an inflammatory event. Pregnancy is a dynamic process characterized by immune tolerance, angiogenesis, and hormonal regulation. Menstruation and pregnancy are associated with a physiological inflammation, which is altered in preeclampsia and probably in other hypertensive situations of pregnancy. An imbalance between pro-oxidant factors and the ability to scavenge these factors produces oxidative stress, which has been evaluated in many cells, but leukocytes are the main source of inflammatory cytokines and experimental and clinical evidence support a possible role of aldosterone as a mediator of placental and renal damage mediated by growth factors, reactive oxygen species, and cytokines. Angiotensin-converting enzyme inhibitors and aldosterone receptor blockers are frequently effective in reducing the risk of progression of cardiovascular and renal disease.
    Journal of Clinical Hypertension 09/2013; 15(9):612-4. · 2.36 Impact Factor
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    ABSTRACT: In normal pregnancies, a hypoxic intrauterine environment seems necessary for early trophoblast development. In this context, maternal serum levels of ischemia-modified albumin (IMA) are elevated, reflecting the oxidative stress associated with placental development. The aim of this study was to evaluate IMA and pregnancy-associated plasma protein A (PAPP-A) in mothers bearing small-for-gestational-age (SGA) fetuses compared to normal pregnancies. A prospective study was performed between June 2010 and June 2011. Serum total albumin, IMA and PAPP-A concentrations were determined in 81 pregnant women in three different periods: 1st trimester, 2nd trimester and postpartum. Two groups of subjects were retrospectively identified: Group (1) mothers bearing appropriate-for-gestational-age (AGA) fetuses, and Group (2) mothers bearing SGA fetuses. Serum total albumin and IMA concentrations were determined in 198 non-pregnant women as controls. Serum IMA concentrations increase during gestation. IMA/albumin serum levels in the 1st trimester were significantly higher in subjects of Group (2) (p<0.05), whereas values of serum PAPP-A MoM were significantly lower (p<0.05). Elevated IMA serum levels together with low levels of PAPP-A were detected in the 1st trimester in mothers bearing SGA fetuses, and this may reflect early placental changes occurring before clinical manifestation of SGA.
    European journal of obstetrics, gynecology, and reproductive biology 07/2013; · 1.97 Impact Factor
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    ABSTRACT: AIMS AND OBJECTIVES: To devise a set of indices representative of a latent dimension of delivery perception, aimed at the assessment of birth experience after both spontaneous and medically assisted conception. BACKGROUND: Birth experience is of great importance for its prognostic value for the woman and newborn's psychophysical well-being, especially after the experience of assisted reproduction technology. Up to date, a delivery perception assessment measure targeted to both spontaneously and medically assisted conceiving women does not exist yet. DESIGN: Measure development and psychometric analysis; quantitative and qualitative analysis of women's delivery experience measures. METHODS: Thirty-one indices characterising seven relevant aspects of birth perception were devised from the literature and evaluated on a 4-point Likert-type scale by 98 childbearing women (54 spontaneously and 44 medically assisted conceiving) in the 24-48 hours postpartum time frame. Women's obstetric history information was also collected. The dimension psychometric definition was pursued within a latent trait perspective, by applying the many-facet Rasch measurement model. RESULTS: A latent delivery perception dimension composed of 18 valid and reliable indices, qualifying six labour and delivery perception clinical aspects, was identified. Medically assisted conceiving women evidenced a more positive birth perception, but when analysing each index, they showed peculiar intense worries about themselves and their baby's health, even if they felt more satisfied, safer and stronger in almost every labour and birth aspect. CONCLUSIONS: The delivery perception dimension integrates all relevant birth experience aspects in 18 easy-to-administer indices and provides a valid, reliable and feasible assessment tool for both the clinical practice and research purposes. RELEVANCE TO CLINICAL PRACTICE: The delivery perception dimension clearly discriminates between women's types of conception and identifies relevant differences in their birth experience, which are interesting for their clinical implications within a prognostic and intervention perspective of support provision in the early postpartum period.
    Journal of Clinical Nursing 06/2013; · 1.32 Impact Factor
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    ABSTRACT: Context:Aldosterone (Aldo) effects include NADPH-oxidase activation involved in Aldo-related oxidative stress. Red blood cells (RBC) are particularly sensitive to oxidative assault and both the association in high molecular weight aggregates (HMWA) and diamide-induced Tyr-phosphorylation (Tyr-P) level of membrane band 3 can be used to monitor their redox status.Objective:Erythrocytes' Aldo-related alterations were evaluated by comparing in vitro evidence.Design:Multicenter comparative study.Study Participants:The study included 12 patients affected by Primary Aldosteronism (PA) and 6 healthy controls (HC), whose RBC were compared with those of PA patients. For in vitro experiments HC-RBC were incubated with increasing Aldo concentrations.Main Outcome Measures:Tyr-P level, band 3 HMWA formation and autologous IgG binding were evaluated.Results:In PA, both Tyr-P levels and band 3 HMWA were higher than in controls.HC-RBC were treated with increasing Aldo concentrations in both platelet poor plasma (PPP) and charcoal-stripped (CS)-PPP. Results showed that Aldo had dose- and time-dependent effects on band 3 Tyr-P and HMWA formation, in CS-PPP more than in PPP. These effects were almost completely prevented by canrenone (Can) or cortisol (Cort). Aldo-related membrane alterations led to increased autologous IgG binding.Conclusion:Erythrocytes from PA patients show oxidative-like stress evidenced by increased HMWA content and diamide-induced band 3 Tyr-P level. Aldo effects are mediated by mineralocorticoid receptor, as suggested by the inhibitory effects of Can, antagonist of Aldo. In CS-PPP, where Aldo induces remarkable membrane alterations leading to IgG binding, Aldo may be responsible for premature RBC removal from circulation.
    The Journal of Clinical Endocrinology and Metabolism 03/2013; · 6.31 Impact Factor
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    ABSTRACT: Objectives We aimed to test the hypothesis that aortic intima thickness is greater in intrauterine growth-restricted (IUGR) twin fetuses compared to normally developing twins, thus defining an increased cardiovascular risk that reflects genetic factors in fetuses sharing the same womb. Methods We conducted a prospective study performed on twins from January 2009 to July 2011. Twins were classified into 3 groups: IUGR fetuses with an estimated fetal weight below the 10th percentile and an umbilical artery pulsatility index of greater than 2 SDs (group A), fetuses with an estimated fetal weight below the 10th percentile and normal Doppler findings (group B), and fetuses with an estimated fetal weight appropriate for gestational age (group C). Aortic intima thickness was measured at a median gestational age of 32 weeks. Values were compared among groups and between each twin and cotwin, also considering sex and chorionicity. Results Twenty-five fetuses were classified as group A, 36 as group B, and 95 as group C. The median aortic intima thickness values were 0.9 mm in group A, 0.7 mm in group B, and 0.6 mm in group C (P < .0001). There was a statistically significant difference between the aortic intima thickness of the twins and cotwins in groups A and B (P < .0001). Sex and chorionicity did not correlate with aortic intima thickness. Conclusions In this study, IUGR fetuses with Doppler abnormalities had greater aortic intima thickness, and IUGR twins with normal Doppler findings had intermediate thickness, supporting a genetic predisposition to cardiovascular risk independent of sex and chorionicity.
    Journal of ultrasound in medicine: official journal of the American Institute of Ultrasound in Medicine 02/2013; 32(2):279-84. · 1.40 Impact Factor
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    ABSTRACT: In order to be able to fertilize oocytes, human sperm must undergo a series of morphological and structural alterations, known as capacitation. It has been shown that the production of endogenous sperm reactive oxygen species (ROS) plays a key role in causing cells to undergo a massive acrosome reaction (AR). Astaxanthin (Asta), a photo-protective red pigment belonging to the carotenoid family, is recognized as having anti-oxidant, anti-cancer, anti-diabetic and anti-inflammatory properties and is present in many dietary supplements. This study evaluates the effect of Asta in a capacitating buffer which induces low ROS production and low percentages of acrosome-reacted cells (ARC). Sperm cells were incubated in the presence or absence of increasing concentrations of Asta or diamide (Diam) and analyzed for their ROS production, Tyr-phosphorylation (Tyr-P) pattern and percentages of ARC and non-viable cells (NVC). Results show that Asta ameliorated both sperm head Tyr-P and ARC values without affecting the ROS generation curve, whereas Diam succeeded in enhancing the Tyr-P level but only of the flagellum without increasing ARC values. It is suggested that Asta can be inserted in the membrane and therefore create capacitation-like membrane alteration which allow Tyr-P of the head. Once this has occurred, AR can take place and involves a higher numbers of cells.
    Marine Drugs 01/2013; 11(6):1909-19. · 3.98 Impact Factor
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    ABSTRACT: The cellular tumor suppressor protein pl61NK4a (p16) has been identified as a biomarker for transforming human papilloma virus (HPV) infections. P16 is a cyclin-dependent kinase inhibitor that regulates the cell cycle and cell proliferation by inhibiting cell cycle G1 progression. To confirm the role of p16 as biomarker for transforming HPV infections and possible clinical applications in histological samples from the uterine cervix. The subject of this study included 56 biopsies of the cervical canal collected from January 2012 to September 2012 in the Institute of Pathology of the University of Sassari. The search for HPV immunohistochemistry was performed with the monoclonal antibody DAKO 1:25, while for the detection of p16 was used CINtecTM p16 (INK4a) histology kit. In 56 biopsies performed in women aged between 23 and 69 years, the authors highlighted, by histological analysis, 24 cases of low-grade squamous intraepithelial lesion (LSIL) - cervical intraepithelial neoplasia (CIN1) and 31 cases of high-grade squamous intraepithelial lesion (HSIL) - CIN2/3); 15 CIN2, 14 CIN3, and two cervical squamous cell carcinoma in situ (SCIS). One case was an infiltrating squamous cell carcinoma (ISC). In 24 CIN1, there was a 16.67% positivity for p16 and an equal percentage occurred for HPV. In 15 cases of CIN2 the percentage of positivity for p16 was considerably increased (73.33%), unlike the search for HPV which had a positivity rate of 20%. Finally, in 14 cases of CIN3, and in three carcinomas, the positivity for p16 was equal to 100%, however the search for HPV positivity was between 0% and 7.14%. These results demonstrated that p16 was a highly sensitive marker of cervical dysplasia. The authors have shown that p16 overexpression increased with the severity of cytological abnormalities and that had a greater ability to identify the viral infection compared to the classical immunohistochemical staining for HPV.
    European journal of gynaecological oncology 01/2013; 34(3):227-30. · 0.58 Impact Factor
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    ABSTRACT: Early and certain diagnoses of endometriosis are mandatory to begin the correct treatment and to exclude the risk of endometriosis-associated ovarian carcinoma (EOC) and endometrial stromal sarcoma (ESS). To assess the immunohistochemical expression of Ber-Ep4, an epithelial antigen, and CD10 in endometriosis. Forty-eight women underwent laparoscopic surgery for endometriosis and endometriotic samples were recovered for histology. In all surgical specimens Ber-Ep4 and CD10 were searched by an immnohistochemical method. The authors evaluated the correlations among the immunohistochemical positivity and the location of endometriosis. Most cases (40/48 83.34%) were represented by ovarian endometriotic cyst. Among the eight remaining cases, three (3/48, 6.25%) were pelvic endometriotic lesions, two (2/48, 4.17%) peritoneum of vesico-uterine pouch, one vaginal lesion (2.08%), one salpinx lesion (2.08%), and one inguinal location (2.08%). Ber-Ep4 and CD10 were expressed in 90% and in 100% of the ovarian lesions, respectively. In pelvic lesions Ber-Ep4 and CD10 showed both 66.67% of positivity and had the same pattern in peritoneal, salpinx, vaginal, and inguinal lesions (50%, 100%, 100%, 100%, respectively). Ber-Ep4 was negative in 6/48 (12.5%) cases whereas CDO10 was negative in 2/48 (4.17%) cases of endometriosis. The sensitivity of Ber-Ep4 and CD10 for endometriosis diagnosis were 87.50% and 95.83%, respectively. Immunohistochemistry for Ber-Ep4 showed positivity in all cases of endometriosis with typical cubic epithelium, whereas CD10 was positive in 1/2 (50%) atypical case. Immunohistochemical expression of Ber-Ep4 and CD10 was positive in most cases of endometriosis and was useful in differential diagnosis with mesothelial cysts. Ber-Ep4 was negative in cases of hyperplastic epithelium or cytological atypia; these cases are not well-differentiated and could be optimally treated by surgery and not by hormonal therapy because of the risk of cancer degeneration.
    European journal of gynaecological oncology 01/2013; 34(3):254-6. · 0.58 Impact Factor
  • European journal of obstetrics, gynecology, and reproductive biology 06/2012; 163(2):243-4. · 1.97 Impact Factor

Publication Stats

795 Citations
218.98 Total Impact Points

Institutions

  • 2003–2014
    • University of Padova
      • • Department of Women’s and Children’s Health SDB
      • • Department of Pediatrics
      • • Department of Medicine DIMED
      Padua, Veneto, Italy
  • 2000–2014
    • University of Udine
      • Department of Medical and Biological Sciences
      Udine, Friuli Venezia Giulia, Italy
  • 1994–2013
    • Università degli Studi di Sassari
      • Dipartimento di Scienze Biomediche
      Sassari, Sardinia, Italy
  • 2009
    • Catholic University of the Sacred Heart
      • School of Obstetrics and Gynecology
      Roma, Latium, Italy
  • 2007–2009
    • West Georgia Obstetrics and Gynecology
      Georgetown, Georgia, United States
  • 2008
    • University of Bologna
      • Department of Experimental, Diagnostic and Specialty Medicine DIMES
      Bolonia, Emilia-Romagna, Italy
    • University-Hospital of Padova
      Padua, Veneto, Italy
  • 2005–2006
    • Università degli Studi di Siena
      • Department of Molecular & Developmental Medicine
      Siena, Tuscany, Italy
  • 2001
    • Università degli Studi del Sannio
      • Department of Biology
      Benevento, Campania, Italy