Emídio Vale-Fernandes

Dr. Emídio Vale-Fernandes

orcid

Research Focus & Metrics

Academic Career Length

12Years (2015-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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27 March 2025 in European Journal of Endocrinology
Verified
Journal Article
Open access
EVEmídio Vale-Fernandes
Emídio Vale-Fernandes
DPDuarte Pignatelli
Duarte Pignatelli
MMMariana Monteiro
Mariana Monteiro
Polycystic ovary syndrome (PCOS) is a prevalent endocrine disorder characterized by hyperandrogenism, ovulatory dysfunction, and polycystic ovarian morphology (PCOM). Despite the widespread use of the Rotterdam criteria, challenges in diagnostic accuracy persist. Anti-Müllerian hormone (AMH), a glycoprotein secreted by ovarian follicles, has emerged as a promising biomarker for refining diagnosis due to its strong correlation with follicular count and elevated levels in women with PCOS. This review critically evaluates the advantages and limitations of incorporating AMH into PCOS diagnostic criteria. Elevated AMH levels are indicative of PCOM and anovulation, offering a non-invasive diagnostic tool that minimizes interobserver variability in ultrasound-based assessments. Additionally, AMH remains stable throughout the menstrual cycle and aligns with phenotypic diversity in PCOS, potentially supporting individualized management strategies. However, significant challenges remain. Variability in AMH assay methods, the absence of comparable cut-off values, and influences of age, ethnicity, and obesity on AMH levels limit its universal applicability. Additionally, AMH cut-offs for PCOS diagnosis, ranging from 3.5 to 5 ng/mL, raises questions about its clinical relevance, as there is not clear evidence of its biological significance. The review also highlights AMH's clinical utility in reproductive medicine, particularly in predicting ovarian response to stimulation, tailoring gonadotropin dosages, and optimizing assisted reproductive technology outcomes. While AMH holds promise as a complementary diagnostic criterion for PCOS, its fully integration into clinical practice requires further validation through standardized assays, population-specific cut-offs, and robust studies to address existing limitations. In conclusion, AMH harbours the potential to enhance the specificity and sensitivity of PCOS diagnosis, particularly in dubious cases. However, the inclusion of AMH in the current criteria for diagnosing PCOS still requires addressing methodological challenges and balancing its benefits against inherent limitations.

7 July 2025 in Reproductive Biology and Endocrinology
Verified
Journal Article
Open access
PDF file
EVEmídio Vale-Fernandes
Emídio Vale-Fernandes
MMMafalda V. Moreira
Mafalda V. Moreira
RBRaquel L. Bernardino
Raquel L. Bernardino
DSDaniela Sousa
Daniela Sousa
RBRaquel Brandão
Raquel Brandão
MMMariana Monteiro
Mariana Monteiro
Polycystic ovary syndrome (PCOS) and obesity can both disrupt reproductive function. However, the extent to which obesity contributes to PCOS manifestations is not very clear. This study aimed to disentangle the relative contributions of PCOS and obesity for reproductive dysfunction in women undergoing in vitro fertilization (IVF). A total of 129 women undergoing IVF treatments were recruited. Women were allocated into four groups according to body mass index (BMI) and PCOS diagnosis: normal-weight controls (n = 33; 21.70 ± 1.85 kg/m²), overweight/obesity controls (n = 28; 28.35 ± 3.05 kg/m²), normal-weight PCOS (n = 31; 21.92 ± 1.95 kg/m²), and overweight/obesity PCOS (n = 37; 31.67 ± 5.03 kg/m²). Circulating levels of luteinizing hormone (LH), follicle-stimulating hormone (FSH), anti-Müllerian hormone (AMH), glucose and insulin were measured in all groups, while insulin resistance was assessed by the Homeostatic Model (HOMA-IR). Additionally, on the oocyte retrieval day, ∆4-androstenedione, testosterone, progesterone and sex hormone-binding globulin (SHBG), were measured in plasma and follicular fluid (FF). IVF outcomes evaluated included the number of oocytes retrieved, oocyte immaturity, as well as fertilization and blastocyst formation rates. A multivariate analysis was performed to determine the independent effects of PCOS and obesity for reproductive and metabolic parameters. Women with PCOS presented significantly higher AMH levels, LH: FSH ratio, and lower FF progesterone levels, confirming these as PCOS-specific signatures regardless of BMI. In contrast, women with overweight/obesity had lower plasma and FF SHBG levels and greater HOMA-IR, independently of PCOS. Furthermore, ∆4-androstenedione and testosterone levels in plasma and FF were significantly higher in women with PCOS and overweight/obesity as compared to normal-weight women with PCOS. Despite the higher oocyte retrieval rates in women with PCOS, no differences in oocyte immaturity, fertilization and blastocyst formation rates were observed. PCOS and obesity independently disrupt female reproductive function suggesting that features associated with each condition may differ. Furthermore, our study shows that obesity exacerbates hyperandrogenism in women with PCOS, highlighting a synergistic detrimental impact on female reproductive function.

27 November 2023 in Biomedicines
Verified
Journal Article
Open access
PDF file
EVEmídio Vale-Fernandes
Emídio Vale-Fernandes
MBMárcia Barreiro
Márcia Barreiro
CLCarla Leal
Carla Leal
RMRosa Zulmira Macedo
Rosa Zulmira Macedo
ATAntónio Tomé
António Tomé
MMMariana Monteiro
Mariana Monteiro
Women with polycystic ovary syndrome (PCOS) tend to have elevated anti-Müllerian hormone (AMH) levels, which appear to correlate with disease severity and pregnancy outcomes. This was a retrospective observational study designed to assess the relationship between circulating AMH levels and in vitro fertilization (IVF) outcomes. The study involved 150 women with PCOS who underwent IVF treatments. The women’s IVF cycles were allocated into three subgroups according to AMH levels: ‘low’ (AMH < 3.7 ng/mL; n = 49), ‘middle’ (AMH 3.7–7.4 ng/mL; n = 94), and ‘high’ (AMH > 7.4 ng/mL; n = 56). All pregnancy-related outcomes (positive beta human chorionic gonadotropin (βHCG), clinical pregnancy rate, live birth rate, and cumulative live birth rate) were greater in women’s IVF cycles with ‘low’ AMH when compared to those with ‘middle’ or ‘high’ AMH (p < 0.05). AMH levels below 3.7 ng/mL were found to be associated with lower oocyte immaturity rate and better pregnancy outcomes, although baseline AMH was not shown to have any significant predictive power for live birth and cumulative live birth in the multivariable logistic regression analysis after adjusting for possible confounders nor in the ROC analyses. In summary, the current study lays the groundwork to validate high AMH levels as a poor prognostic factor for pregnancy outcomes after IVF in women with PCOS.

4 April 2025 in Molecular and Cellular Endocrinology
Verified
Journal Article
Open access
EVEmídio Vale-Fernandes
Emídio Vale-Fernandes
David CarragetaDavid Carrageta
David Carrageta
MMMafalda V. Moreira
Mafalda V. Moreira
Bárbara Guerra-CarvalhoBárbara Guerra-Carvalho
Bárbara Guerra-Carvalho
Bárbara RodriguesBárbara Rodrigues
Bárbara Rodrigues
MMMariana Monteiro
Mariana Monteiro
Polycystic ovary syndrome (PCOS) is a prevalent endocrine disorder affecting women of reproductive age, yet the molecular mechanisms influencing its pathophysiology remain poorly defined. A comprehensive prospective case-control study was conducted to elucidate the follicular fluid (FF) hormone and metabolite profile in women with PCOS and its implications for oocyte maturation and fertilization. The study involved 40 age- and body mass index (BMI)-matched women undergoing in vitro fertilization (IVF), including 20 diagnosed with PCOS and 20 controls with infertility due to tubal or male factors. A distinctive hormone profile in the FF of women with PCOS was identified, characterized by significantly higher anti-Müllerian hormone (AMH) levels (24.90±17.61 vs. 16.68±17.67 pmol/L, p=0.0039) and lower progesterone (8253±4748 vs. 25362±10862 ng/mL, p<0.0001) and estradiol levels (388.23±210.58 vs. 651.48±390.79 ng/mL, p=0.0208) compared to normoovulatory controls. Moreover, a metabolite fingerprint associated with glycolytic and mitochondrial dysfunction was observed, as evidenced by lower lactate (4575.44±1507.76 vs. 5595.34±1073.32 μmol/L, p=0.0182) and formate (64.51±16.06 vs. 75.81±16.63 μmol/L, p=0.0351) levels and higher citrate levels (136.93±52.53 vs. 109.15±24.17 μmol/L, p=0.0409) in the FF of women with PCOS. These findings suggest that the molecular profile of the FF in women with PCOS is related to granulosa cell glycolytic and mitochondrial dysfunction, which can have a negative impact on oocyte fertilization potential. The study provides an integrative analysis of the FF hormone and metabolite profile in women with PCOS, offering insights into the molecular mechanisms underlying the reproductive dysfunctions associated with this condition.

1 January 2025 in JBRA Assisted Reproduction
Verified
Journal Article
Open access
BNBeatriz Ribeiro Neto
Beatriz Ribeiro Neto
MBMárcia Barreiro
Márcia Barreiro
ATAntónio Tomé
António Tomé
EVEmídio Vale-Fernandes
Emídio Vale-Fernandes
This review examines the impact of Assisted Reproductive Technology (ART) on prospective parents and born children, as well as their parental relationships, considering their emotional and social context. Specific situations are analyzed, such as gynecological pathologies and heterologous treatments, such as the ROPA (Reception of Oocytes from Partner) method, and the use of gestational surrogacy, which have particular psychosocial impacts. Infertility affects approximately one-third of the global population, leading many to seek ART, which have grown in popularity over the decades. In addition to clinical concerns, the psychosocial impact of these techniques has received increasing attention, given the implications for mental health and family relationships. Based on a narrative review methodology, it analyzes experimental and observational studies on the topic, seeking to understand and evaluate the impact of ART techniques. The results highlight the emotional and ethical complexity associated with treatment decisions, from the decision to engage to these treatments to the psychosocial implications of the different available options. Anxiety and depression are common responses to the challenges faced during treatment, affecting both direct beneficiaries and their interpersonal relationships. Gestational surrogacy and heterologous treatments add layers of complexity. Regarding the impact on parental relationships and the development of children conceived through these methods, it is concluded that, despite concerns, children conceived through ART have the potential to grow and thrive as well as naturally conceived ones. This review emphasizes the importance of an inclusive and holistic approach to treating infertility, recognizing that parenthood goes beyond biological conception.´P)I?J: '+-.

1 January 2024 in JBRA Assisted Reproduction
Verified
Journal Article
Open access
TMTânia Moreira
Tânia Moreira
CLCarla Leal
Carla Leal
MBMárcia Barreiro
Márcia Barreiro
ATAntónio Tomé
António Tomé
EVEmídio Vale-Fernandes
Emídio Vale-Fernandes
Polycystic Ovary Syndrome (PCOS) is the most common endocrine disorder in women of reproductive age, being one of the main causes of infertility. Anti-Müllerian hormone (AMH) is an important marker of ovarian reserve and has been proposed as an alternative criterion for the diagnosis of PCOS. This study verifies whether AMH and body mass index (BMI) values are predictors of pregnancy in infertile women with PCOS undergoing artificial insemination (AI), a less invasive and painless technique of assisted reproductive technologies (ART). This retrospective observational study involved 220 women with PCOS who underwent AI between 2010 and 2022. Participants were categorized into three groups based on BMI and serum AMH levels. To categorize the three AMH classes, the 25th (4.08ng/mL) and 75th (8.99ng/mL) AMH percentiles were defined as cut-offs, and the words 'low', 'middle', and 'high' were utilized to define the groups. There was a tendency towards a decrease in reproductive outcomes (number of inseminations with positive human-chorionic gonadotropin, number of live births, and number of term births) with an increase in the BMI value. All of these outcomes were also slightly higher in women with 'middle' AMH levels compared to women with 'low' and 'high' AMH. However, none of these results were statistically significant. This study suggests BMI may be an important predictive factor for pregnancy and there appears to be a range of biological normality for AMH values, where 'low' and 'high' levels of this hormone could constitute a marker of poor reproductive prognosis, in women with PCOS undergoing AI.