<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1646-5830</journal-id>
<journal-title><![CDATA[Acta Obstétrica e Ginecológica Portuguesa]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Obstet Ginecol Port]]></abbrev-journal-title>
<issn>1646-5830</issn>
<publisher>
<publisher-name><![CDATA[Euromédice, Edições Médicas Lda.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1646-58302025000200118</article-id>
<article-id pub-id-type="doi">10.69729/aogp.v19i2a06</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[IVF/ICSI cycles with GnRH antagonist protocol: is it possible to avoid weekend oocyte retrievals?]]></article-title>
<article-title xml:lang="pt"><![CDATA[Ciclos FIV/ICSI com estimulação ovárica com protocolo com antagonista da GnRH: é possível evitar as punções ao fim-de-semana?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carvalho]]></surname>
<given-names><![CDATA[Margarida Meira de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Policiano]]></surname>
<given-names><![CDATA[Catarina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pereira]]></surname>
<given-names><![CDATA[Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Calhaz-Jorge]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lopes]]></surname>
<given-names><![CDATA[Giedre]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carvalho]]></surname>
<given-names><![CDATA[Marta]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leal]]></surname>
<given-names><![CDATA[Fernanda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguiar]]></surname>
<given-names><![CDATA[Ana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Unidade Local de Saúde Amadora/Sintra Serviço de Ginecologia ]]></institution>
<addr-line><![CDATA[Amadora ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Unidade Local de Saúde de Santa Maria Departamento de Obstetrícia, Ginecologia e Medicina da Reprodução Unidade de Medicina da Reprodução]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidade de Lisboa Faculdade de Medicina ]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>Portugal</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<volume>19</volume>
<numero>2</numero>
<fpage>118</fpage>
<lpage>129</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.pt/scielo.php?script=sci_arttext&amp;pid=S1646-58302025000200118&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.pt/scielo.php?script=sci_abstract&amp;pid=S1646-58302025000200118&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.pt/scielo.php?script=sci_pdf&amp;pid=S1646-58302025000200118&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Overview and Aims:  Ovarian stimulation with gonadotrophins and LH surge suppression with GnRH antagonist has become the most widely protocol used in IVF/ICSI cycles. The main disadvantage lies in the lack of flexibility on the starting day of gonadotrophin stimulation when a fresh transfer is planned, which may lead to a higher frequency of weekend retrievals. The aim of this study was to determine the best weekday to start gonadotrophin stimulation to reduce the frequency of weekend oocyte retrievals in IVF/ICSI cycles using GnRH antagonist protocol, as well as to evaluate the impact of the day of oocyte retrieval in laboratory parameters.  Methods:  A retrospective cohort study was performed in the Reproductive Medicine Unit of a Portuguese University Hospital. The study included all consecutive women undergoing oocyte retrieval between January-2016 and December-2021 after gonadotrophin stimulation with GnRH antagonist protocol with an intent of fresh embryo transfer. The main outcome was to determine which weekday for initiating ovarian stimulation led to the lowest number of weekend retrievals. Secondary outcomes included assessing whether the laboratory results were affected by the day of retrieval.  Results:  A total of 376 IVF/ICSI cycles were analyzed. Most oocyte retrievals were performed during the 5-day workweek, with 45 (12%) occurring during the weekend. Saturday and Sunday oocyte retrievals were less likely when gonadotrophin stimulation started on Friday (p=0.01) and more likely when started on Monday (p=0.002) or Tuesday (p=0.008). The number of oocytes retrieved per cycle and viable day 2 embryos were not influenced by the day of retrieval and, even though fertilization (66% vs. 71.6%) was lower in the weekend group, the difference was not statistically significant.  Conclusions:  The onset of ovarian stimulation on Monday or Tuesday resulted in significantly more oocyte retrievals during the weekend. Regarding laboratory outcomes, no difference was found between the cycles with or without weekend retrievals.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Introdução e Objetivos:  O protocolo de estimulação ovárica com supressão do pico de LH com antagonista da GnRH tornou-se o mais utilizado nos tratamentos de Procriação Medicamente Assistida. A sua principal desvantagem prende-se com a duração mais imprevisível da estimulação em comparação com o protocolo agonista e ausência de flexibilidade no dia de início da estimulação quando se antecipa uma transferência embrionária a fresco, podendo associar-se a maior frequência de punções ováricas ao fim-de-semana. O objetivo deste estudo foi determinar qual o melhor dia para iniciar a estimulação ovárica de forma a reduzir o número de punções oocitárias ao fim-de-semana, bem como avaliar o seu impacto nos desfechos laboratoriais.  Métodos:  Foi realizado um estudo retrospetivo de coorte na Unidade de Medicina da Reprodução de um Hospital Universitário português, que incluiu todas as mulheres submetidas a punção ovárica após estimulação com protocolo com antagonista entre janeiro de 2016 e dezembro de 2021. Foi avaliada a frequência de punções ováricas realizadas ao fim-de-semana em função do dia da semana de início da estimulação, bem como o impacto do dia da punção oocitária nos resultados reprodutivos.  Resultados:  Foram incluídas 376 punções ováricas, 45 (12%) realizadas em dias de fim-de-semana, sendo a sua frequência inferior nos casos de início da estimulação à 6.ª feira (p=0,01) e superior quando iniciada à 2.ª (p=0,002) ou 3.ª feira (p=0,008). O número de oócitos por ciclo e embriões de dia 2 viáveis não foram influenciados pelo dia da punção e, apesar das taxas de fertilização (66% vs. 71,6%) serem inferiores nas mulheres em que foi realizada punção ao fim-de-semana, esta diferença não atingiu significado estatístico.  Conclusões:  O início da estimulação ovárica à 2.ª e 3.ª feiras resultou numa maior frequência de punções ováricas ao fim-de-semana. Em relação aos desfechos laboratoriais do tratamento FIV/ICSI, não se verificou diferença entre os grupos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Assisted reproductive medicine]]></kwd>
<kwd lng="en"><![CDATA[Cycle scheduling]]></kwd>
<kwd lng="en"><![CDATA[Cycle start day]]></kwd>
<kwd lng="en"><![CDATA[GnRH antagonist]]></kwd>
<kwd lng="en"><![CDATA[Weekend oocyte retrieval]]></kwd>
<kwd lng="pt"><![CDATA[Medicina da Reprodução]]></kwd>
<kwd lng="pt"><![CDATA[Programação do ciclo]]></kwd>
<kwd lng="pt"><![CDATA[Protocolo com antagonista da GnRH]]></kwd>
<kwd lng="pt"><![CDATA[Punção oocitária ao fim-de-semana]]></kwd>
</kwd-group>
</article-meta>
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