<?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>1646-706X</journal-id>
<journal-title><![CDATA[Angiologia e Cirurgia Vascular]]></journal-title>
<abbrev-journal-title><![CDATA[Angiol Cir Vasc]]></abbrev-journal-title>
<issn>1646-706X</issn>
<publisher>
<publisher-name><![CDATA[Sociedade Portuguesa de Angiologia e Cirurgia Vascular]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1646-706X2018000400005</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Rastreio do Aneurisma da Aorta Abdominal, estado atual da arte]]></article-title>
<article-title xml:lang="en"><![CDATA[Screening of abdominal aortic aneurysm, current state of the art]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Costa]]></surname>
<given-names><![CDATA[Susana]]></given-names>
</name>
<xref ref-type="aff" rid="A1"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Machado]]></surname>
<given-names><![CDATA[Rui]]></given-names>
</name>
<xref ref-type="aff" rid="A1 "/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Almeida]]></surname>
<given-names><![CDATA[Rui de]]></given-names>
</name>
<xref ref-type="aff" rid="A1 "/>
</contrib>
</contrib-group>
<aff id="AA1">
<institution><![CDATA[,Universidade do Porto Instituto de Ciências Biomédicas Abel Salazar ]]></institution>
<addr-line><![CDATA[Porto ]]></addr-line>
</aff>
<aff id="AA2">
<institution><![CDATA[,Centro Hospitalar Universitário do Porto Serviço de Angiologia e Cirurgia Vascular ]]></institution>
<addr-line><![CDATA[Porto ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>14</volume>
<numero>4</numero>
<fpage>315</fpage>
<lpage>326</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S1646-706X2018000400005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S1646-706X2018000400005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S1646-706X2018000400005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[O aneurisma da aorta abdominal (AAA) ocorre mais frequentemente em homens de idade avançada, raça caucasiana, com historial tabágico ou história familiar de AAA. Os AAA parecem ter indicação para rastreio populacional pela sua prevalência (4-8%) e mortalidade (80-90%); existência de período de latência até à rotura do aneurisma; uso de técnica eficaz, económica e segura para rastrear; e, tratamento com baixa taxa de mortalidade. O objetivo deste trabalho foi efetuar uma análise crítica dos resultados de programas de rastreio populacional de AAA e seu impacto na mortalidade. Na revisão bibliográfica analisou-se ainda se o decréscimo na prevalência na última década poderá ter implicações na viabilidade destes programas. Os estudos randomizados MASS, Chichester e Viborg demonstraram que o rastreio de AAA é viável, mesmo 13 a 15 anos após o início do programa. Dois dos estudos comprovaram o custo-eficácia de rastrear AAA. O estudo realizado na Austrália revelou-se não efetivo, provavelmente por um diagnóstico incidental elevado. A meta-análise destes estudos demonstrou que o rastreio populacional de AAA reduz a mortalidade relacionada com AAA em 4 por 1000 homens com mais de 65 anos e reduz a mortalidade por todas as causas a longo termo, em 5 por 1000. Um estudo de coorte com 61.982 participantes reportou uma redução no número de aneurismas rotos e na média do diâmetro aórtico ao longo de 20 anos. Estudos recentes sugerem que o rastreio de AAA é economicamente viável até uma prevalência de 0,5% nos homens e 1,1% nas mulheres. Modelos estatísticos demonstraram que o rastreio de AAA importa benefícios comparáveis com outros programas de rastreio. A implementação de programas populacionais de rastreio de AAA na população masculina com mais de 65 anos é viável e clinicamente relevante, contribuindo para uma redução na mortalidade associada aos AAA. O rastreio de mulheres, pelo menos com historial tabágico, parece ter legitimidade, mas é necessária maior evidência para determinar a sua viabilidade. Segundo dados dos programas “Aorta não avisa” e “Aorta é vida” a prevalência de AAA em Portugal é de cerca de 4%, o que parece justificar a implantação de programa de rastreio populacional no país.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abdominal aortic aneurysm (AAA) occurs most often in older men, Caucasian, with history of smoking or family history of AAA. AAA seems to have indication for population screening for its prevalence (4-8%) and mortality (80-90%); existence of a latency period until aneurysm rupture; use of an efficient, economic and safe screening technique; and treatment with a low mortality rate. The objective of this work was to perform a critic analysis of the results of AAA population screening programs and their impact on mortality. It was also analyzed if the decrease in the prevalence in the last decade will have implications in the viability of these programs. The randomized trials MASS, Chichester and Viborg showed that the screening of AAA is feasible, even 13 to 15 years after the begging of the program. Two of the trials have proven that screening AAA is cost-effective. The trial performed in Australia revealed to be ineffective, probably due to a high incidental diagnosis. The meta-analysis of these studies has shown that population-based screening for AAA reduces the AAA-related mortality by 4 per 1000 men with 65 years or more and reduces all-cause mortality in the long-term, by 5 per 1000. A cohort study with 61,982 participants reported a reduction in the number of ruptured aneurysms and reduction of mean aortic diameter over 20 years. Recent studies suggest that screening of AAA is economically viable up to a prevalence of 0.5% in men and 1.1% in women. Statistical models have shown that screening of AAA has benefits comparable to other screening programs. The implementation of AAA population screening programs in the male population over 65 years-old is viable and clinically relevant, contributing to a reduction in mortality related to AAA. The screening in women, at least with history of smoking, appears to have legitimacy, but more evidence is needed to determine its viability. According to data of “Aorta não avisa” and “Aorta é Vida” programs the prevalence of AAA in Portugal is around 4%, which seems to justify the implementation of a population screening program in the country.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Aneurisma da aorta abdominal]]></kwd>
<kwd lng="pt"><![CDATA[Rastreio]]></kwd>
<kwd lng="pt"><![CDATA[Ultrassonografia]]></kwd>
<kwd lng="pt"><![CDATA[Viabilidade económica]]></kwd>
<kwd lng="pt"><![CDATA[Vigilância]]></kwd>
<kwd lng="en"><![CDATA[Abdominal aortic aneurysm]]></kwd>
<kwd lng="en"><![CDATA[Screening]]></kwd>
<kwd lng="en"><![CDATA[Ultrasonography]]></kwd>
<kwd lng="en"><![CDATA[Economic viability]]></kwd>
<kwd lng="en"><![CDATA[Surveillance]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2"><b>ARTIGO DE REVISÃO</b></font></p>     <p><font size="4"><b>Rastreio do Aneurisma da Aorta Abdominal, estado atual da    arte</b></font></p>     <p><font size="3"><b>Screening of abdominal aortic aneurysm, current state of    the art</b></font></p>     <p><b>Susana Costa<sup>1</sup>; Rui Machado<sup>1,2</sup>; Rui de Almeida<sup>1,2</sup></b></p>     <p><sup>1</sup>Instituto de Ciências Biomédicas Abel Salazar (ICBAS) - Universidade    do Porto</p>     <p><sup>2</sup>Serviço de Angiologia e Cirurgia Vascular, Centro Hospitalar Universitário    do Porto</p>     <p><a href="#c0">Endere&ccedil;o para correspond&ecirc;ncia</a> | <a href="#c0">Direcci&oacute;n    para correspondencia</a> | <a href="#c0">Correspondence</a><a name="topc0"></a></p> <hr/>     <p>&nbsp;</p>     <p><b>RESUMO</b></p>     <p>O aneurisma da aorta abdominal (AAA) ocorre mais frequentemente em homens de    idade avançada, raça caucasiana, com historial tabágico ou história familiar    de AAA. Os AAA parecem ter indicação para rastreio populacional pela sua prevalência    (4-8%) e mortalidade (80-90%); existência de período de latência até à rotura    do aneurisma; uso de técnica eficaz, económica e segura para rastrear; e, tratamento    com baixa taxa de mortalidade. O objetivo deste trabalho foi efetuar uma análise    crítica dos resultados de programas de rastreio populacional de AAA e seu impacto    na mortalidade. Na revisão bibliográfica analisou-se ainda se o decréscimo na    prevalência na última década poderá ter implicações na viabilidade destes programas.    Os estudos randomizados MASS, Chichester e Viborg demonstraram que o rastreio    de AAA é viável, mesmo 13 a 15 anos após o início do programa. Dois dos estudos    comprovaram o custo-eficácia de rastrear AAA. O estudo realizado na Austrália    revelou-se não efetivo, provavelmente por um diagnóstico incidental elevado.    A meta-análise destes estudos demonstrou que o rastreio populacional de AAA    reduz a mortalidade relacionada com AAA em 4 por 1000 homens com mais de 65    anos e reduz a mortalidade por todas as causas a longo termo, em 5 por 1000.    Um estudo de coorte com 61.982 participantes reportou uma redução no número    de aneurismas rotos e na média do diâmetro aórtico ao longo de 20 anos. Estudos    recentes sugerem que o rastreio de AAA é economicamente viável até uma prevalência    de 0,5% nos homens e 1,1% nas mulheres. Modelos estatísticos demonstraram que    o rastreio de AAA importa benefícios comparáveis com outros programas de rastreio.    A implementação de programas populacionais de rastreio de AAA na população masculina    com mais de 65 anos é viável e clinicamente relevante, contribuindo para uma    redução na mortalidade associada aos AAA. O rastreio de mulheres, pelo menos    com historial tabágico, parece ter legitimidade, mas é necessária maior evidência    para determinar a sua viabilidade. Segundo dados dos programas &ldquo;Aorta não avisa&rdquo;    e &ldquo;Aorta é vida&rdquo; a prevalência de AAA em Portugal é de cerca de 4%, o que parece    justificar a implantação de programa de rastreio populacional no país.</p>     ]]></body>
<body><![CDATA[<p><b>Palavras-chave: </b>Aneurisma da aorta abdominal; Rastreio; Ultrassonografia;    Viabilidade económica; Vigilância</p> <hr/>     <p>&nbsp;</p>     <p><b>ABSTRACT</b></p>     <p>Abdominal aortic aneurysm (AAA) occurs most often in older men, Caucasian,    with history of smoking or family history of AAA. AAA seems to have indication    for population screening for its prevalence (4-8%) and mortality (80-90%); existence    of a latency period until aneurysm rupture; use of an efficient, economic and    safe screening technique; and treatment with a low mortality rate. The objective    of this work was to perform a critic analysis of the results of AAA population    screening programs and their impact on mortality. It was also analyzed if the    decrease in the prevalence in the last decade will have implications in the    viability of these programs. The randomized trials MASS, Chichester and Viborg    showed that the screening of AAA is feasible, even 13 to 15 years after the    begging of the program. Two of the trials have proven that screening AAA is    cost-effective. The trial performed in Australia revealed to be ineffective,    probably due to a high incidental diagnosis. The meta-analysis of these studies    has shown that population-based screening for AAA reduces the AAA-related mortality    by 4 per 1000 men with 65 years or more and reduces all-cause mortality in the    long-term, by 5 per 1000. A cohort study with 61,982 participants reported a    reduction in the number of ruptured aneurysms and reduction of mean aortic diameter    over 20 years. Recent studies suggest that screening of AAA is economically    viable up to a prevalence of 0.5% in men and 1.1% in women. Statistical models    have shown that screening of AAA has benefits comparable to other screening    programs. The implementation of AAA population screening programs in the male    population over 65 years-old is viable and clinically relevant, contributing    to a reduction in mortality related to AAA. The screening in women, at least    with history of smoking, appears to have legitimacy, but more evidence is needed    to determine its viability. According to data of &ldquo;Aorta não avisa&rdquo; and &ldquo;Aorta    é Vida&rdquo; programs the prevalence of AAA in Portugal is around 4%, which seems    to justify the implementation of a population screening program in the country.  </p>     <p></p>     <p><b>Keywords: </b>Abdominal aortic aneurysm; Screening; Ultrasonography; Economic    viability; Surveillance</p> <hr/>     <p>&nbsp;</p>     <p><b>Introdução</b></p>     <p>O aneurisma da aorta abdominal (AAA) é definido como uma dilatação da aorta    abdominal com um diâmetro igual ou superior a 3 cm nos planos ântero-posterior    ou transverso, que corresponde a mais de 2 desvios padrões acima do diâmetro    médio da aorta(1,2). Os AAA ocorrem maioritariamente na aorta infrarrenal, próximo    da bifurcação das artérias ilíacas comuns(3). A sua prevalência varia com a    idade, o género e a raça, sendo mais prevalente em homens caucasianos de idade    avançada(4,5). O AAA é responsável por 1-2% das causas de morte nos homens com    mais de 65 anos(6,7). Estudos iniciais sugerem uma prevalência de 4-8% em homens    com mais de 65 anos e 0,5-1,5% nas mulheres(8-11). Publicações recentes mencionam    que a prevalência da doença tem diminuído na última década, possivelmente por    diminuição do consumo de tabaco, prevenção de fatores de risco cardiovasculares,    diminuição da mortalidade e morbilidade perioperatória na cirurgia eletiva e    melhoria dos resultados pós-cirúrgicos de aneurismas rotos(12-14). </p>     <p>Os AAA com 3 a 4,9 cm de diâmetro aórtico têm baixo risco de rotura, pelo que    não está recomendada intervenção cirúrgica nestes pacientes, realizando-se apenas    vigilância imagiológica regular e tratamento médico. A ecografia é o exame de    imagem de escolha para a deteção e vigilância dos AAA em pacientes assintomáticos    pelo seu baixo custo e acessibilidade. Ademais, a ecografia é um exame não invasivo    e tem uma sensibilidade e especificidade próximas dos 100%(15, 16).A principal    desvantagem da ecografia abdominal é a dificuldade em visualizar a aorta em    pacientes obesos e/ou com excesso de ar no trato intestinal. Os pacientes com    AAA com um diâmetro aórtico =5,5 cm, sintomáticos ou com um ritmo de crescimento    superior a 1 cm por ano têm indicação para referenciação para a especialidade    de Cirurgia Vascular e intervenção cirúrgica pelo risco acrescido de rotura    do aneurisma e consequente elevado risco de morte (80-90%). Os pacientes com    risco acrescido de rotura devem ser considerados para cirurgia eletiva quando    apresentam um AAA com um diâmetro aórtico de 5 cm. Nas mulheres está indicada    a referenciação para a Cirurgia Vascular em AAA com um diâmetro aórtico de 5    cm e intervenção cirúrgica com 5,2 cm(17), porque estas têm um risco de rotura    do aneurisma comparativamente aos homens 3 a 4 vezes superior e uma taxa de    mortalidade intra-hospitalar superior. Além disso, existe um risco acrescido    de rotura de pequenos aneurismas no sexo feminino(18, 19). A correção cirúrgica,    quando indicada, deve ser realizada em centros especializados auditados, com    uma taxa de mortalidade inferior a 5% e 2% por cirurgia eletiva via aberta e    via endovascular (EVAR), respetivamente. Ademais, estes centros devem realizar    pelo menos 50 cirurgias eletivas por ano(17). </p>     ]]></body>
<body><![CDATA[<p>O AAA tem uma história natural que favorece o seu rastreio, nomeadamente a    sua prevalência, a existência de um período de latência de anos até à rotura,    a existência de uma técnica eficaz, económica e segura para rastrear, o tratamento    cirúrgico eletivo associado a baixa taxa de mortalidade e a mortalidade elevada    da doença quando não tratada, que sugerem que a realização de rastreio populacional    poderá trazer benefícios(20, 21). Neste contexto, efetuamos uma análise dos    programas de rastreio de AAA publicados para avaliar a população a rastrear,    a viabilidade da sua implementação, e seu impacto na mortalidade. Neste trabalho    analisou-se ainda se o decréscimo na prevalência na última década poderá ter    implicações na viabilidade destes programas.</p>     <p>Outros temas também serão abordados nesta revisão bibliográfica, como por exemplo,    o impacto na qualidade de vida do diagnóstico da doença, a medição do diâmetro    aórtico, o intervalo de vigilância de pequenos aneurismas e as ectasias aórticas.</p>     <p><b>Material e Métodos</b></p>     <p>Uma pesquisa de artigos científicos publicados em inglês, nas bases de dados    eletrónicas: MEDLINE/PubMed, Web of Science e Cochrane foi realizada utilizando    as palavras-chave &ldquo;abdominal aortic aneurysm&rdquo; e &ldquo;screening&rdquo;. A pesquisa foi    limitada aos artigos publicados entre janeiro de 2007 e dezembro de 2017. Da    pesquisa realizada resultaram 1225 referências. Após eliminação dos artigos    em duplicado foram analisados o título e resumo dos artigos encontrados e excluídos    os artigos fora do âmbito deste trabalho, nomeadamente, os artigos de revisão,    os artigos de opinião, os artigos de rastreio oportunista de AAA e os artigos    documentando apenas a prevalência dos AAA no grupo em estudo. No final, foram    selecionados 61 artigos para a elaboração deste artigo. </p>     <p>Adicionalmente foi conduzida uma pesquisa em português relativa a programas    de rastreio de AAA realizados em Portugal.</p>     <p>Rastreio do Aneurisma da Aorta Abdominal</p>     <p>O AAA é assintomático numa fase inicial e apenas quando atinge um diâmetro    aórtico considerável é que complica e se manifesta. A sua rotura é uma emergência    médica e está associada a uma taxa de mortalidade elevada (80-90%). A maioria    dos doentes morre ainda antes de chegar no hospital, e aqueles que chegam vivos    são submetidos a cirurgia de urgência, com um risco de morte de 50%(20, 21).    De acordo com os critérios da Organização Mundial de Saúde (OMS)(22) há potencial    para realizar-se o rastreio populacional de AAA. </p>     <p>Estudos randomizados</p>     <p>O primeiro estudo de rastreio de AAA foi implementado por Collins, em 1988,    em Oxford(23). No final dos anos 80’s, início da década de 90 surgiram os primeiros    estudos de larga escala para determinar a viabilidade e benefício da implementação    de programas de rastreio de AAA. Estes decorreram no Reino Unido (Chichester,    MASS), na Dinamarca (Viborg) e na Austrália (Western Australia) para rastrear    homens com 65 anos ou mais. </p>     <p>Em todos os estudos o rastreio foi realizado através de uma ecografia abdominal.    Na <a href="#t1">tabela I</a> estão descritas as condições de implementação    de cada estudo.</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p align="center"><a name="t1"></a><img src="/img/revistas/ang/v14n4/14n4a05t1.jpg"/></p>     
<p>&nbsp;</p>     <p>O estudo decorrido em Chichester incluiu 15.775 pessoas entre os 65 e os 80    anos de idade, com uma prevalência de AAA de 7,6% em homens e 1,3% em mulheres.    No sexo masculino, o grupo convidado evidenciou uma redução de 55% na incidência    de rotura do aneurisma e uma redução na morte por rotura ao quinto ano de estudo    de 42%(11). A longo termo verificou-se uma diminuição nos benefícios do programa,    com uma redução na mortalidade por AAA a 10 anos de 21%(25) e apenas 11% a 15    anos(26). O número considerável de cirurgias eletivas na população não rastreada    e o aumento da incidência de rotura e do número mortes relacionados com AAA    após 10 anos de estudo no grupo controlo poderá ter contribuído para o esmorecimento    dos benefícios do programa de rastreio com o passar do tempo(25). </p>     <p>Para o estudo MASS foram selecionados 67.800 homens com idades compreendidas    entre os 65 e os 74 anos(8), dos quais 1333 tinham um diâmetro aórtico =3 cm,    o que correspondeu a uma prevalência de AAA de 4,9%. A redução no número de    mortes relacionadas com AAA rondou os 42-48% nos 13 anos de estudo(8,27-29).    O decréscimo no risco relativo observado após 10 anos de rastreio deveu-se à    ocorrência de rotura de AAA em participantes inicialmente rastreados com um    diâmetro aórtico inferior a 3 cm. O número de homens necessário rastrear para    evitar 1 morte foi estimado em 216(29). Embora inicialmente não tenham observado    impacto na mortalidade global(8), no final do estudo os autores advogaram uma    redução de 3% na mortalidade por todas as causas(29).</p>     <p>Para o estudo randomizado realizado na Dinamarca foram selecionados 13.500    homens com 65 a 73 anos de idade, com uma prevalência de AAA no grupo rastreado    de 4,2%(10). Os resultados do estudo demonstraram igualmente uma redução significativa    na mortalidade por AAA, com uma redução superior a 65% ao longo dos 14 anos    de estudo(30-32). Conformemente ao estudo MASS, o programa de rastreio realizado    em Viborg originou uma redução na mortalidade global de 2%. O grupo de trabalho    avaliou ainda se o rastreio de AAA poderia ser restringido a grupos de alto    risco. Os dados demonstraram uma redução drástica no número de rastreios (73%),    no entanto, seriam prevenidas menos de metade das mortes relacionadas com AAA(33).  </p>     <p>No estudo implementado na Austrália Ocidental observaram uma prevalência de    4,8% nos homens entre os 65 e os 69 anos e 10,8% para idade superior(9, 34).    Ao longo do estudo verificaram uma menor diferença na mortalidade por AAA entre    os grupos controlo e rastreado comparativamente aos outros estudos randomizados.    Os resultados demonstraram que o programa foi mais benéfico nos participantes    com idades entre os 65 e os 75 anos, com uma redução na mortalidade por AAA    de apenas 8% nos participantes dessa faixa etária. Vários fatores poderão ter    contribuído para a baixa eficácia na redução da mortalidade neste estudo, nomeadamente:</p>     <p>- Faixa etária dos participantes, com participantes até aos 83 anos de idade;</p>     <p>- Taxa de comparência inferior a outros estudos randomizados;</p>     <p>- Reduzido número de aneurismas com indicação cirúrgica, embora apresente uma    elevada prevalência da doença;</p>     ]]></body>
<body><![CDATA[<p>- Inclusão de participantes no programa não elegíveis para rastreio e/ou tratamento;</p>     <p>- Grupo convidado para rastreio incluiu um elevado número indivíduos que não    compareceram e que durante o estudo morreram por complicações associadas ao    AAA;</p>     <p>- Elevada percentagem de diagnósticos incidentais e tratamento eletivo de sucesso    no grupo de controlo, contribuindo para uma baixa taxa de mortalidade por AAA    nesse grupo(9, 34).</p>     <p>O número de rastreios necessários para prevenir uma morte por AAA a 5 anos    foi estimado em 4784 para homens com idades compreendidas entre os 64 e os 83    anos; e, 3290 para homens com 65 a 74 anos de idade(34). Os resultados deste    estudo randomizado foram os menos promissores dentre os 4, com uma redução na    mortalidade por AAA inferior à observada nos outros estudos, bem como a necessidade    de um número muito superior de rastreios para prevenir uma morte por AAA.</p>     <p>Em continuação do estudo inicialmente desenvolvido para o rastreio de AAA,    o departamento de Cirurgia Vascular do Hospital de Viborg prosseguiu com um    estudo randomizado (VIVA) para o rastreio combinado de AAA, tensão arterial    e doença arterial periférica(35). Dos 18.749 homens que participaram no estudo,    3,3% tinham AAA, 10,9% doença arterial periférica e 10,5% hipertensão arterial(36).    Após 5 anos de estudo, os resultados demonstraram uma redução na mortalidade    global de 7% no grupo rastreado(24). Os autores estimaram que seria necessário    convidar 169 homens para o programa de rastreio para salvar 1 vida. Os resultados    obtidos sugerem que a implementação de programa de rastreio vascular poderá    providenciar ganhos em saúde semelhantes, talvez até superiores, ao dos programas    de rastreio de cancro.</p>     <p>Meta-análise dos 4 estudos randomizados</p>     <p>A análise estatística dos 4 estudos randomizados foi realizada por 3 grupos    de trabalho e os resultados estão resumidos na <a href="#t2">tabela II</a>.</p>     <p>&nbsp;</p>     <p align="center"><a name="t2"></a><img src="/img/revistas/ang/v14n4/14n4a05t2.jpg"/></p>     
<p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>As meta-análises de Cosford et al.(37) e Lindholt et al.(42) evidenciaram uma    redução estatisticamente significativa na morte por AAA, com odds ratio de 0,6    e 0,56, respetivamente. No que refere à mortalidade global a análise estatística    demostrou uma redução não significativa (odds ratio 0,95/0,94). As meta-análises    elaboradas por Takagi e colaboradores(39-41) também demonstraram uma redução    significativa na mortalidade relacionada com AAA, designadamente de 4 por 1.000    homens com mais de 65 anos. Assim sendo, seria necessário rastrear 238 homens    com mais de 65 anos para salvar uma vida(40). Os resultados das meta-análises    indicam que o rastreio de AAA poderá ter um benefício superior ao de programas    de rastreio implementados, como o cancro da mama(43), o cancro colo-rectal(44)    ou o cancro da próstata(45) (<a href="#t3">tabela III</a>). A análise estatística    dos resultados mais recentes dos estudos randomizados sugere uma redução na    mortalidade por todas as causas a longo termo, de 5 por 1000, embora este não    atinga estritamente uma significância estatística(39).</p>     <p>&nbsp;</p>     <p align="center"><a name="t3"></a><img src="/img/revistas/ang/v14n4/14n4a05t3.jpg"/></p>     
<p>&nbsp;</p>     <p>Estudos não randomizados</p>     <p>No Reino Unido foram efetuados alguns programas de rastreio de AAA para além    dos estudos randomizados Chichester e MASS. Em Gloucestershire foram rastreados    52.690 homens com 65 anos de idade no início da década de 90(47). Dos participantes    no programa, 2412 tinham um diâmetro aórtico entre 2,6 e 5,4 cm (4,57%) e 148    um diâmetro superior a 5,4 cm (0,28%). Ao longo dos 20 anos de programa ocorreu    um decréscimo na média do diâmetro aórtico nos homens rastreados.</p>     <p>Na Escócia, entre 2001 e 2004, foram rastreados 8146 homens com idades compreendidas    entre os 65 e os 74 anos, pertencentes à região de Highland e de Western Isles(48).    A prevalência de aneurismas foi de 5,1% e as ectasias aórticas (diâmetro aórtico    2,5-2,9 cm) foram detetadas em 8,2% dos rastreados. A mortalidade ao longo do    programa foi inferior ao observado noutros estudos, com apenas 11 mortes por    AAA em 7 anos de estudo, representando 0,14% da coorte e 1,7% de todas as causas    de morte. </p>     <p>Em Dublin o risco cardiovascular de 481 homens com mais de 60 anos foi avaliado,    com uma prevalência de AAA de 4,8%(49). Ao contrário do expectável o risco cardiovascular    a 10 anos foi semelhante entre a população sem AAA e os participantes com AAA.    O programa demonstrou-se custo-eficaz, sugerindo benefício na incorporação da    avaliação do risco cardiovascular nos programas de rastreio de AAA, tal como    observado no estudo randomizado VIVA. </p>     <p>Orientações europeias, americanas e canadianas relativamente ao rastreio de    AAA</p>     <p>Com base no conhecimento atual sobre AAA e dos potenciais benefícios do seu    rastreio entidades especializadas em Cirurgia Vascular têm redigido diretrizes    neste âmbito.</p>     ]]></body>
<body><![CDATA[<p>A Sociedade Europeia de Cirurgia Vascular (ESVS) publicou em 2011 orientações    sobre a prática clínica de AAA, nomeadamente recomendações quanto ao rastreio    de indivíduos do sexo masculino aos 65 anos(17). O rastreio poderá ser realizado    numa idade mais jovem se houver um risco elevado de desenvolver AAA e a reavaliação    imagiológica deve limitar-se aos indivíduos rastreados em idade jovem ou com    alto risco de desenvolver AAA. O rastreio de homens e mulheres com história    familiar de AAA parece recomendável. No que refere às mulheres de baixo risco    não está indicado o rastreio. Por sua vez, não é explícito relativamente às    mulheres com historial tabágico. O rastreio de asiáticos não está indicado,    pois não parece ser custo-eficaz. O rastreio oportunístico de AAA deve ser considerado    em indivíduos com doença arterial periférica, uma vez que a incidência de AAA    é elevada neste grupo.</p>     <p>A US Preventive Service Task Force (USPSTF)(50) publicou as mais recentes orientações    sobre o rastreio de AAA em 2014. A USPSTF recomenda um rastreio único por ultrassonografia    de homens com 65 a 75 anos com historial de tabaco, isto é, consumo de pelo    menos 100 cigarros. Esta, recomenda ainda o rastreio de casos selecionados de    homens não fumadores. O rastreio de mulheres não está recomendado, nem mesmo    naquelas com historial tabágico. A American College of Preventive Medicine fez    recomendações similares, sugerindo o rastreio único de homens com 65 a 75 anos    com historial tabágico(51).</p>     <p>A Canadian Society for Vascular Surgery recomenda a implementação de um programa    populacional de rastreio de AAA a todos os homens com 65 a 75 anos de idade    e ainda pessoas com alto risco de desenvolver AAA, incluindo mulheres com 65    anos de alto risco, por consumo tabágico, doença cardiovascular ou história    familiar de AAA; e, homens com menos de 65 anos com história familiar de AAA(52).    Recentemente, a Canadian Task Force on Preventive Health Care reforçou a indicação    para o rastreio único de homens entre os 65 e os 80 anos(53). </p>     <p>Programas nacionais de rastreio de AAA</p>     <p>Decorrente dos resultados promissores obtidos nos estudos randomizados e das    orientações internacionais foram implementados programas de rastreio de AAA    no Reino Unido, na Suécia e nos EUA.</p>     <p>No Reino Unido a implementação de programa de rastreio populacional de AAA    em homens com 65 anos de idade iniciou-se em 2009. Um ano após o início do National    Health Service Abdominal Aortic Aneurysm Screening Program (NAAASP) já tinham    sido realizados 4216 rastreios(54) e 15.000 em 3 anos(55). O programa revelou    uma prevalência de AAA de apenas 1,7%. Este decréscimo na prevalência comparativamente    a estudos anteriores realizados no Reino Unido poderá estar relacionado com    alterações na dieta e no estilo de vida, diminuição dos hábitos tabágicos e    prevenção do risco cardiovascular(55). Em 2016, a linha dos 700.000 rastreios    foi ultrapassada e a prevalência diminuiu ligeiramente para os 1,09%(56). O    número de rastreios necessários para a identificação de um aneurisma foi de    78 na raça caucasiana, 154 na raça negra e 431 na raça asiática, respetivamente(57).</p>     <p>Na Suécia o programa de rastreio foi introduzido gradualmente em 2006 e atingiu    a cobertura nacional em 2015(58). Ao longo de 8 anos de programa mais de 250    mil homens com 65 anos ou mais foram rastreados, com uma prevalência de AAA    de 1,5%. O programa nacional demonstrou uma redução significativa na mortalidade    por AAA, designadamente uma redução de 4% por ano de rastreio. O número necessário    rastrear para prevenir uma morte foi de 667, que corresponde para uma população    de 9,5 milhões à prevenção de 90 mortes prematuras por AAA por ano, e um ganho    de 577 anos ajustado à qualidade de vida.</p>     <p>Nos EUA, a Veterans Affairs iniciou em 2007 um programa de rastreio de AAA    em veteranos do sexo masculino entre os 65 e os 75 anos, que fumaram pelo menos    100 cigarros ao longo da vida e em mulheres com 50 anos ou mais com história    familiar de AAA. Dos 9751 pacientes rastreados, 698 foram diagnosticados com    AAA, o que corresponde a uma prevalência de 7,1%. Em simultâneo a Medicare começou    a rastrear utentes do sexo masculino com historial tabágico, e homens e mulheres    com história familiar de AAA(59). O programa teve um baixo rendimento, com rastreio    de apenas 1-3% dos utentes elegíveis(59, 60). Segundo dados do Screening Abdominal    Aortic Aneurysms Very Efficiently Act (SAAAVE) o impacto do programa foi modesto,    sem alterações significativas na taxa de reparação de AAA, sua rotura ou na    mortalidade global(60).</p>     <p>Realidade portuguesa</p>     <p>Em Portugal, em 2012, foi realizado um programa de rastreio de AAA, não sistemático,    designado &ldquo;Aorta não avisa&rdquo;. O projeto promovido pela Sociedade Portuguesa de    Angiologia e Cirurgia Vascular (SPACV) percorreu todas as capitais de distrito    do país. No decorrer do projeto foram realizadas 1822 ecografias abdominais,    com uma prevalência de AAA estimada em 2,2% na população com mais de 60 anos.    Este valor ascendeu para 3,94% em homens com mais de 65 anos(61). Os dados do    estudo insinuam uma prevalência semelhante à observada em alguns estudos europeus.    Segundo dados de Sousa, P. e Fernandes e Fernandes, J.(61, 62) o diagnóstico    incidental de AAA em Portugal é baixo, por exemplo, em 2014, menos de 500 AAA    não rotos foram diagnosticados, o que estará a contribuir para a reduzida taxa    de tratamento da doença no país. Dados não publicados de outro projeto, &ldquo;Aorta    é Vida&rdquo;, revelaram uma prevalência de AAA de 4,2% entre as mais de mil pessoas    rastreadas. </p>     ]]></body>
<body><![CDATA[<p>Em 2016, Castro-Ferreira et al.(63, 64) realizou um programa de rastreio sistemático    de AAA e de avaliação do risco cardiovascular na USF Valongo. A prevalência    de AAA foi de 2,1% em homens com mais de 65 anos, valor inferior ao observado    nos outros projetos.</p>     <p>Rastreio de AAA no sexo feminino</p>     <p>O AAA tem uma menor prevalência no sexo feminino, mas um maior risco de complicações,    especialmente um risco superior de rotura, incluindo dos pequenos aneurismas.    Estudos sugerem que existe diferenças nas características clínicas e anatómicas    dos AAA na população feminina, nomeadamente apresentação de AAA numa idade mais    avançada e características anatómicas desfavoráveis, como uma anatomia mais    complexa e maior ângulo do colo do aneurisma que contribuem para o acrescido    risco de complicações(65).</p>     <p>Chichester foi o único estudo randomizado a incluir mulheres na amostragem.    A baixa prevalência de aneurismas, a rotura dos aneurismas numa idade mais avançada    e uma incidência de rotura dos aneurismas semelhante entre os grupos ao longo    do estudo traduziu-se num benefício limitado de rastreio nas mulheres no estudo    Chichester(66).</p>     <p>O programa de rastreio vascular patrocinado pela Stroke and Aneurysm Vascular    Evaluation (SAVE)(67) que decorreu entre 2004 e 2006 em alguns estados dos EUA    revelou uma prevalência de AAA de 0,6% na população feminina. A prevalência    aumentou para 1% em fumadoras. A prevalência também aumentou com a idade, de    1,4% em mulheres com 75 anos para 2,7% em mulheres com mais de 85 anos. Um estudo    realizado na Suécia apresentou resultados parecidos, com uma prevalência de    0,4% em mulheres com 70 anos(68). </p>     <p>Uma meta-análise de 8 estudos, englobando mais de 1,5 milhões de mulheres,    refere heterogeneidade na prevalência dos AAA. Segundo a meta-análise a prevalência    é geralmente superior a 1% em mulheres com mais de 70 anos ou com historial    tabágico(69).</p>     <p>A análise estatística realizada por Wanhainen et al.(70) estimou que o rastreio    de AAA em mulheres com 65 anos de idade deverá ser custo-eficaz para uma prevalência    superior a 1,1%. Assim sendo, o rastreio de mulheres, pelo menos as com historial    tabágico, parece viável economicamente. No entanto, são necessários estudos    adicionais para corroborar os benefícios em saúde do rastreio de AAA desta população    em específico.</p>     <p>Intervalo de vigilância de aneurismas da aorta abdominal</p>     <p>Os AAA com diâmetro aórtico de 3 a 5,5 cm têm um risco de rotura baixo, pelo    que está indicado apenas vigilância regular por ecografia abdominal. Ainda não    existe consenso sobre o intervalo de vigilância a implementar no seguimento    desses pacientes.</p>     <p>Uma meta-análise sobre o ritmo de crescimento dos AAA estimou que o acréscimo    de 1 cm no diâmetro aórtico está associado a um aumento no ritmo de crescimento    de 1,62 mm/ano(71). Assim sendo, um aneurisma com 3,5 cm de diâmetro levará    em média 6,2 anos a atingir 5,5 cm de diâmetro, enquanto um aneurisma com 4,5    cm de diâmetro atingirá essa dimensão em apenas 2 a 3 anos. Neste sentido, segundo    os autores um intervalo de vigilância de vários anos para aneurismas entre os    3 e os 4 cm é clinicamente aceitável. Para os aneurismas com 4 a 4,9 cm de diâmetro    a vigilância anual é custo-eficaz, enquanto uma vigilância semestral de aneurismas    com 5 a 5,5 cm é aceitável.</p>     ]]></body>
<body><![CDATA[<p>Viabilidade da vigilância de ectasias aórticas</p>     <p>Os estudos randomizados Viborg e Chichester foram dos primeiros a avaliar o    risco de progressão de ectasia aórtica (2,5-2,9 cm de diâmetro aórtico) para    AAA. No estudo Viborg dos 162 participantes com um diâmetro aórtico inicial    de 2,5-2,9 cm, 28% progrediram para AAA em 3 a 5 anos(30). No estudo Chichester    foram detetados 166 casos com AAA durante o estudo, os quais tinham um diâmetro    aórtico médio inicial de 2,5 cm, sugerindo que aortas abdominais com um diâmetro    aórtico entre os 2,5 e os 2,9 cm têm um risco acrescido de progredir para aneurisma(72).    Neste contexto, foram realizados alguns estudos para determinar a viabilidade    económica e os benefícios da vigilância de pacientes rastreados com ectasia    aórtica, os quais estão resumidos na <a href="#t4">tabela IV</a>.</p>     <p>&nbsp;</p>     <p align="center"><a name="t4"></a><img src="/img/revistas/ang/v14n4/14n4a05t4.jpg"/></p>     
<p>&nbsp;</p>     <p>Um estudo observacional multicentro verificou a progressão de 67,7% das ectasias    aórticas para AAA em 5 anos. A análise a longo-termo da mortalidade de pacientes    com ectasias aórticas demonstrou um efeito significativo na mortalidade global(73).    Os dados obtidos com um modelo estatístico demonstraram viabilidade económica    na vigilância das ectasias aórticas uma vez 5 anos após o rastreio inicial(75).  </p>     <p>Estes estudos apoiam a inclusão das ectasias aórticas no programa de vigilância,    pelo menos uma vez, fomentando uma redução na incidência de AAA não diagnosticados    e uma redução na morte por AAA.</p>     <p>Medição do diâmetro aórtico</p>     <p>No que refere à medição do diâmetro aórtico não há consenso, com os estudos    a selecionarem diferentes pontos da parede aórtica como referência. Na maioria    dos estudos são usadas uma das três opções: limite interno - limite interno    (LI-LI), limite externo - limite externo (LE-LE) ou limite externo - limite    interno (LE-LI) da parede aórtica para a medição do diâmetro aórtico. Alguns    estudos avaliaram se havia diferença nas dimensões do diâmetro aórtico para    estes 3 métodos de medição e a sua reprodutibilidade. Os resultados obtidos    nesses estudos estão sumariados na <a href="#t5">tabela V</a>. O diâmetro aórtico    quando medido pelo método LE-LE é cerca de 4 a 6 mm superior à medição pelo    método LI-LI(76-79). Essa diferença é menor quando comparados os métodos LE-LI    e LE-LE, com uma diferença de 2 a 2,6 mm no diâmetro aórtico(77, 79). Borgbjerg    et al.(79) observou uma quase duplicação na prevalência de AAA quando usado    o método LE-LE em vez do LI-LI. Pelas diferenças observadas entre os métodos    de medição do diâmetro aórtico alguns autores recomendam a vigilância de pacientes    com diâmetro aórtico entre os 2,5 e os 2,9 cm quando utilizada a metodologia    LI-LI no rastreio inicial(78). No que refere à reprodutibilidade do método de    medição do diâmetro aórtico existe inconsistência entre os estudos, sendo necessários    estudos adicionais para uma análise mais fidedigna da reprodutibilidade destes    métodos.</p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="center"><a name="t5"></a><img src="/img/revistas/ang/v14n4/14n4a05t5.jpg"/></p>     
<p>&nbsp;</p>     <p>Custo-eficácia do programa de rastreio de AAA</p>     <p>Os estudos randomizados MASS e Viborg foram os primeiros a demonstrar viabilidade    económica na implementação de programas de rastreio populacional de AAA. O estudo    MASS verificou uma melhoria no custo-eficácia com o progredir do tempo, com    um custo por ano de vida ganho estimado em £41.000 no 4º ano de estudo, £14.000    no 7º ano e £7.600 após 10 anos de estudo(27, 28). Ao 7º ano do estudo já apresentava    um custo inferior ao valor referenciado como aceitável para a realização de    intervenções em saúde no Reino Unido (£25.000)(81). O estudo Viborg foi igualmente    custo-efetivo com um custo estimado em 157€ por ano de vida ganho e 179€ por    ano ajustado à qualidade de vida(32).</p>     <p>O programa nacional de rastreio de AAA implementado no Reino Unido demonstrou    ser custo-eficaz, mesmo apesar dos custos do programa e da baixa prevalência    de AAA. O programa NAAASP continua a ser custo-eficaz a longo-termo, com um    custo estimado em £5758 por ano de vida ganho e £7370 por ano ajustado à qualidade    de vida a 30 anos, valor bem abaixo do limite recomendado pelo NICE (The National    Institute for Health and Care Excellence)(82). </p>     <p>A viabilidade de implementar programas de rastreio de AAA em outros países    também tem vindo a ser avaliada. O custo de rastreio de homens de 65 a 75 anos    italianos(83) foi estimado em 290€ e 350€, para as coortes de &ldquo;não rastreio&rdquo;    e &ldquo;rastreio&rdquo;, respetivamente. Para uma comparência de 62% no grupo rastreado,    o estudo estimou um incremento do rácio custo-eficácia de 5673€ por ano ajustado    à qualidade de vida. Com base neste valor os autores consideram ser custo-eficaz    a implementação de um programa de rastreio no serviço nacional de saúde italiano.    O modelo de Markov também foi aplicado na determinação do custo-eficácia de    um programa de rastreio de AAA na Holanda e na Noruega(84), demonstrando que    o rastreio de AAA em homens de 65 anos poderá ser eficaz nestes países, mesmo    para uma prevalência de AAA de 1%. No caso da Dinamarca os custos foram estimados    em £43.485 por ano ajustado à qualidade de vida, valor esse superior ao estimado    como custo-eficaz (£30.000) para a implementação de um programa no país(85).  </p>     <p>Estudos recentes demonstraram um decréscimo na prevalência de AAA, e neste    contexto, alguns estudos foram realizados para avaliar a implicação na viabilidade    dos programas de rastreio. Svensjö et al.(86) verificou que o rastreio único    em homens com 65 anos de idade continua a ser custo-eficaz até uma prevalência    de 0,5% e clinicamente revelante como medida de saúde preventiva. O programa    deixaria de ser custo-eficaz se o diagnóstico incidental de AAA fosse superior    a 65% e a prevalência da patologia inferior a 0,8%. Um outro estudo baseado    nos dados do programa nacional de rastreio sueco demonstrou igualmente que é    ainda custo-eficaz rastrear AAA(87). Segundo Svensjö(86), para além de viável    economicamente, o rastreio de AAA continua a ser benéfico em termos de saúde,    com redução do risco relativo de morte por AAA em 42% e redução do risco absoluto    de morte por AAA de 15,1 por 10.000 convidados para rastreio. Ademais, o rastreio    de AAA continua a ter impacto clínico comparável com outros programas de rastreio,    como por exemplo, o cancro da próstata e o cancro da mama que conferem uma redução    do risco relativo de 20%(45) e de 15%(43), respetivamente. </p>     <p>Considerando os dados obtidos nos programas de rastreios realizados em Portugal,    os quais sugerem uma prevalência de AAA superior a 2%, associado a uma reduzida    taxa de tratamento da doença, apoiam a implementação de programa de rastreio    populacional de AAA no país.</p>     <p>Impacto do rastreio de AAA na qualidade de vida</p>     <p>O estudo MASS foi dos primeiros a avaliar o impacto psicossocial do diagnóstico    de AAA, com ausência de efeitos adversos quanto à ansiedade e à depressão nos    participantes diagnosticados com aneurisma. No entanto, a curto prazo estes    pacientes tiveram uma pontuação inferior nos questionários disponibilizados    no que refere ao estado de saúde mental e físico e na autoavaliação da sua saúde(8).    No estudo VIVA, de entre os 460 pacientes com AAA que preencheram um questionário    de qualidade de vida, apenas 28 (6%) referiram um aumento da ansiedade durante    o período de vigilância(24).</p>     ]]></body>
<body><![CDATA[<p>Um estudo prospetivo decorrido na Austrália avaliou o bem-estar psicológico    e a qualidade de vida de pacientes previamente rastreados para AAA(88). Os questionários    preenchidos antes do rastreio não apresentavam diferenças entre o grupo controlo    e o grupo rastreado com AAA. Por sua vez, os questionários de seguimento a 6    meses evidenciaram uma diminuição significativa no estado geral de saúde, mas    sem diferenças em termos de ansiedade e depressão.</p>     <p>No estudo realizado no Skane University Hospital, Suécia, os 52 participantes    com AAA reportaram mais problemas de funcionamento físico, dor, stress e afeção    da saúde em geral comparativamente aos participantes sem AAA. No que refere    à ansiedade e à depressão não verificaram diferenças entre os grupos(89).</p>     <p>Berterö et al.(90) entrevistou 10 homens com AAA, os quais referiram ter pensamentos    depressivos sobre o diagnóstico de AAA e a incerteza do que poderia vir a acontecer,    nomeadamente os riscos associados ao crescimento do aneurisma e à cirurgia.    Num outro estudo realizado na Suécia os participantes experienciaram ansiedade    ao longo do primeiro ano após o diagnóstico da doença, insegurança sobre como    o estilo de vida poderia influenciar a doença e relativamente ao que poderiam    fazer para melhorar a sua saúde(91).</p>     <p>No geral os pacientes com AAA parecem apresentar um pior estado geral, apreensão    e insegurança sobre a doença e nalguns dos estudos observou-se também ansiedade,    dor e stress. Alguns destes estudos empregaram um número muito reduzido de participantes    limitando a extrapolação de conclusões gerais sobre o impacto psicológico do    diagnóstico de AAA, pelo que persiste a necessidade de realizar mais estudos,    e com uma amostra mais representativa para obter evidência científica quanto    ao impacto emocional e psicossocial do diagnóstico de AAA.</p>     <p><b>Conclusões</b></p>     <p>O AAA é uma doença potencialmente fatal se não for diagnosticada e tratada    atempadamente. A sua rotura é uma emergência médica e está associada a uma taxa    de mortalidade elevada. Neste sentido, a comunidade médica tem desenvolvido    vários estudos para avaliar a viabilidade económica e benefícios de saúde do    rastreio populacional de AAA. Os estudos randomizados MASS, Chichester e Viborg    comprovaram que o rastreio populacional de AAA é viável. Além disso, o rastreio    de AAA demonstrou ser benéfico como medida de saúde preventiva, com uma redução    no número de mortes por AAA em mais de 40%. A longo-termo em dois dos estudos    verificou-se uma diminuição nos benefícios em termos de mortalidade, mas continuando    a evidenciar-se custo-efetividade após 13-15 anos de estudo. Um quarto estudo    randomizado realizado na Austrália Ocidental, pelo contrário, revelou-se não    efetivo. Alguns fatores poderão ter contribuído para esta desconformidade de    resultados, como a faixa etária dos participantes, reduzido número de aneurismas    com indicação cirúrgica, elevada taxa de diagnóstico incidental e tratamento    eletivo no grupo de controlo. O rastreio de AAA poderá reduzir a mortalidade    por AAA em 4 por 1.000 homens com mais de 65 anos, indicando um benefício de    saúde comparável ao estabelecido para outros programas de rastreio, como o cancro    da mama, da próstata e colo-rectal. </p>     <p>Na última década a prevalência de AAA baixou para menos de 2% no Reino Unido    e Suécia, segundo os dados dos respetivos programas de rastreio nacionais. Mesmo    perante este novo paradigma, os programas de rastreio de AAA continuam a ser    custo-efetivos e clinicamente relevantes até uma prevalência de 0,5% em homens    com idade igual ou superior a 65 anos de idade.</p>     <p>Os dados de tratamento de AAA (baixo diagnóstico incidental) e de programas    de rastreio realizados em Portugal (prevalência semelhante aos estudos internacionais)    apoiam a implementação de programa de rastreio populacional de AAA no país.</p>     <p>Um programa de rastreio vascular populacional combinado, nomeadamente fatores    de risco cardiovascular, doença arterial periférica e aneurisma, parece ser    efetivo, com resultados promissores na redução da mortalidade global. A implementação    de programas de rastreio cardiovascular mais completos poderá ser especialmente    benéfico em regiões com uma baixa prevalência de AAA, mas são necessários mais    estudos para evidenciar esses benefícios.</p>     <p>O rastreio de AAA em mulheres com 65 anos de idade parece ser custo-eficaz    até uma prevalência de 1,1%, pelo que o rastreio de mulheres, pelo menos as    com historial tabágico, parece viável economicamente. No entanto, são necessários    estudos adicionais para avaliar a viabilidade do rastreio de AAA nesta população    em específico.</p>     ]]></body>
<body><![CDATA[<p>Um intervalo de vigilância de vários anos para AAA com um diâmetro aórtico    entre os 3 e os 4 cm, vigilância anual de aneurismas entre os 4 e os 4,9 cm    e semestral de aneurismas entre os 5 e os 5,5 cm parece aceitável. As ectasias    aórticas têm um risco acrescido de progressão para AAA pelo que vários autores    recomendam a inclusão deste subgrupo nos programas de vigilância, com viabilidade    económica para a sua reavaliação pelo menos uma vez 5 anos após o rastreio inicial.</p>     <p>A metodologia a aplicar na medição do diâmetro aórtico não é consensual, mas    é fundamental a sua uniformização futuramente, porque existem diferenças na    medição do diâmetro aórtico até 4-6 mm entre métodos.</p>     <p>Os estudos de avaliação psicossocial demonstraram um pior estado geral, apreensão    e insegurança nos pacientes com AAA e em alguns casos ansiedade, dor e stress.</p>     <p>A implementação de programas populacionais de rastreio de AAA na população    masculina com mais de 65 anos é viável e clinicamente relevante, contribuindo    para uma redução na mortalidade na população alvo. O rastreio de mulheres, pelo    menos naquelas com historial tabágico, parece ter legitimidade, mas é necessária    maior evidência para determinar a sua viabilidade. Os dados existentes apoiam    a sua implementação em Portugal.</p>     <p>&nbsp;</p>     <p><b>REFERÊNCIAS BIBLIOGRÁFICAS</b></p>     <!-- ref --><p>1. Steinberg I. Arteriosclerotic abdominal aortic aneurysms - Report of 200    consecutive cases diagnosis by intravenous aortography. JAMA. 1966;195(12):149-53.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=899299&pid=S1646-706X201800040000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>     <!-- ref --><p>2. Wanhainen A, Thermudo R, Ahlstrom H, Lind L, Johausson L. Thoracic and abdominal    aortic dimension in 70-year-old men and women - A population-based whole-body    magnetic resonance imaging (MRI) study. J Vasc Surg. 2008;47(3):504-12.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=899301&pid=S1646-706X201800040000500002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>     ]]></body>
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<body><![CDATA[<!-- ref --><p>90. Bertero C, Carlsson P, Lundgren F. Screening for abdominal aortic aneurysm,    a one-year follow up: an interview study. J Vasc Nurs. 2010;28(3):97-101.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=899473&pid=S1646-706X201800040000500090&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>     <!-- ref --><p>91. Pettersson M, Hansson A, Brodersen J, Kumlien C. Experiences of the screening    process and the diagnosis abdominal aortic aneurysm among 65-year-old men from    invitation to a 1-year surveillance. J Vasc Nurs. 2017;35(2):70-7.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=899475&pid=S1646-706X201800040000500091&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>     <p>&nbsp;</p>     <p><a href="#topc0">Endere&ccedil;o para correspond&ecirc;ncia</a> | <a href="#topc0">Direcci&oacute;n    para correspondencia</a> | <a href="#topc0">Correspondence</a><a name="c0"></a></p>     <p>Correio eletrónico: <a href="mailto:susanpatricia88@hotmail.com">susanpatricia88@hotmail.com</a>    (S. Costa).</p>     <p>&nbsp;</p>     <p><b>Responsabilidades éticas </b></p>     <p>Os autores declaram que para este trabalho não se realizaram experiências em    seres humanos e/ou animais.</p>     ]]></body>
<body><![CDATA[<p>Os autores declaram terem seguido os protocolos do seu centro de trabalho acerca    da publicação dos dados dos doentes.</p>     <p><b>Conflitos de interesses: </b>Os autores declaram não haver conflito de interesses.</p>     <p>&nbsp;</p>     <p>Recebido a 29 de fevereiro de 2018</p>     <p>Aceite a 03 de fevereiro de 2019</p>     <p>&nbsp;</p>      ]]></body><back>
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