<?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>1024-0675</journal-id>
<journal-title><![CDATA[Revista de la Sociedad Boliviana de Pediatría]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. bol. ped.]]></abbrev-journal-title>
<issn>1024-0675</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Boliviana de Pediatría]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1024-06752006000300009</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Avaliação de fatores de risco associados com elevação da pressão arterial em crianças]]></article-title>
<article-title xml:lang="en"><![CDATA[Evaluation of risk factors associated with increased blood pressure in children]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Garcia]]></surname>
<given-names><![CDATA[Frederico D.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Terra]]></surname>
<given-names><![CDATA[Aleyson F.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Queiroz]]></surname>
<given-names><![CDATA[Anderson M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Correia]]></surname>
<given-names><![CDATA[Cristiano A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos]]></surname>
<given-names><![CDATA[Priscila S.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferreira]]></surname>
<given-names><![CDATA[Quésia T.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rocha]]></surname>
<given-names><![CDATA[Regina L.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oliveira]]></surname>
<given-names><![CDATA[Eduardo A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidade Federal de Minas Gerais (UFMG) Faculdade de Medicina ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidade Federal de Minas Gerais (UFMG) Departamento de Pediatria ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2006</year>
</pub-date>
<volume>45</volume>
<numero>3</numero>
<fpage>178</fpage>
<lpage>184</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_arttext&amp;pid=S1024-06752006000300009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_abstract&amp;pid=S1024-06752006000300009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_pdf&amp;pid=S1024-06752006000300009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Objetivos: Identi&#64257;car fatores associados a níveis elevados de pressão arterial em crianças. Métodos: Estudo transversal da pressão arterial de 672 crianças entre 2 e 11 anos de idade em duas instituições de ensino de Belo Horizonte, entre setembro e dezembro de 2001. A pressão arterial foi mensurada seguindo os parâmetros estabelecidos pelo relatório do Update on the 1987 Task Force Report on High Blood Pressure in Children and Adolescents. As seguintes variáveis foram estudadas: idade, sexo, cor da pele, índice de qualidade de vida urbana, estatura e índice de massa corporal. Para a comparação das médias, foi utilizada a análise de variância, e para a comparação de proporções, o teste quiquadrado. As variáveis associadas a níveis mais elevados de pressão arterial foram incluídas em análise de regressão linear múltipla. Resultados: Na análise univariada, níveis mais elevados de press ão arterial sistólica e diastólica estiveram associados com crianças de cor branca, crianças da região com alto índice de qualidade de vida urbana e com elevado índice de massa corporal. Na análise multivariada, apenas o índice de massa corporal, o índice de qualidade de vida urbana e a estatura mantiveram-se associados com níveis elevados de pressão sistólica. Em relação aos níveis mais elevados de pressão arterial diastólica, apenas as variáveis índice de qualidade de vida urbana e idade foram mantidas no modelo após o ajustamento. Conclusão: O sobrepeso e a obesidade estiveram associados com níveis mais elevados de pressão arterial sistólica. Outros fatores, não identi&#64257;cados, foram parcialmente associados a níveis mais elevados de pressão arterial de crianças do estabelecimento privado do ensino.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Objective: To identify factors associated with increased arterial blood pressure in children. Methods: In this cross-sectional study, arterial blood pressure was measured in 672 children between 2 and 11 years of age from two schools in the city of Belo Horizonte, Brazil. After providing informed consent, all children had their blood pressure and anthropometric parameters measured. Blood pressure was measured based on the recommendations of the Update on the 1987 Task Force Report on High Blood Pressure in Children and Adolescents. The following variables were assessed: age, sex, race, urban life quality index, weight, height, and body mass index. Analysis of variance was used for comparison of means and the chi-square was used for comparison of proportions. Variables associated with increased blood pressure were included in a multiple regression model. Results: According to univariate analysis, increased systolic and diastolic blood pressure were associated with high urban life quality index, white race and high body mass index. On multivariate analysis, body mass index, urban life quality index and height remained associated with increased systolic blood pressure; urban life quality index and age were associated with increased diastolic blood pressure. Conclusion: In this study, excess weight and obesity were associated with increased systolic blood pressure. Other unidenti&#64257;ed factors were partially associated with increased blood pressure in children from the school with elevated urban life quality index.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Fatores de risco]]></kwd>
<kwd lng="pt"><![CDATA[obesidade]]></kwd>
<kwd lng="pt"><![CDATA[sobrepeso]]></kwd>
<kwd lng="pt"><![CDATA[etnia]]></kwd>
<kwd lng="pt"><![CDATA[estudo transversal]]></kwd>
<kwd lng="en"><![CDATA[Risk factors]]></kwd>
<kwd lng="en"><![CDATA[obesity]]></kwd>
<kwd lng="en"><![CDATA[overweight]]></kwd>
<kwd lng="en"><![CDATA[race]]></kwd>
<kwd lng="en"><![CDATA[cross-sectional study]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <P align="right"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <strong>ARTICULOS DEL CONO SUR - BRASIL  </strong></font></P>     <div align="justify"><strong><font size="4" face="Verdana, Arial, Helvetica, sans-serif">Avalia&ccedil;&atilde;o de fatores de risco    associados com eleva&ccedil;&atilde;o da press&atilde;o arterial em crian&ccedil;as<Sup>1    </Sup>   </font> </strong></div>     <P align="justify"><strong><font size="3" face="Verdana, Arial, Helvetica, sans-serif"> Evaluation of risk factors associated with increased blood pressure in children </font></strong></P>     <p align="justify"><strong><font size="2" face="Verdana, Arial, Helvetica, sans-serif">IFrederico D. Garcia<Sup>1</Sup>, Aleyson F. Terra<Sup>1</Sup>, Anderson M. Queiroz<Sup>1</Sup>, Cristiano A. Correia<Sup>1</Sup>,  Priscila S. Ramos<Sup>1</Sup>, Qu&eacute;sia T. Ferreira<Sup>1</Sup>, Regina L. Rocha<Sup>2</Sup>, Eduardo A. Oliveira<Sup>2 </Sup></font></strong></p>     <p align="justify"><font size="1" face="Verdana, Arial, Helvetica, sans-serif">1. Acad&ecirc;micos, Faculdade de Medicina, Universidade Federal de Minas Gerais (UFMG).     <br>   2. Doutor. Professor adjunto, Departamento de Pediatria, UFMG. Artigo submetido em 05.05.03, aceito em 17.09.03. </font></p>     <P align="justify"><font size="1" face="Verdana, Arial, Helvetica, sans-serif"> <strong>(1) Art&iacute;culo original de Brasil. Publicado en el Journal de Pediatr&iacute;a (Rio J.): 2004;80 (1): 29-34 y que fue seleccionado para su reproducci&oacute;n en la X Reuni&oacute;n de Editores de Revistas Pedi&aacute;tricas del Cono Sur, Chile 2005. </strong></font></P> <hr> <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>Resumo</strong></font>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <strong>Objetivos:</strong> Identi&#64257;car fatores associados a n&iacute;veis elevados de press&atilde;o arterial em crian&ccedil;as. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <strong>M&eacute;todos:</strong> Estudo transversal da press&atilde;o arterial de 672 crian&ccedil;as entre 2 e 11 anos de idade em duas institui&ccedil;&otilde;es de ensino de Belo Horizonte, entre setembro e dezembro de 2001. A press&atilde;o arterial foi mensurada seguindo os par&acirc;metros estabelecidos pelo relat&oacute;rio do Update on the 1987 Task Force Report on High Blood Pressure in Children and Adolescents. As seguintes vari&aacute;veis foram estudadas: idade, sexo, cor da pele, &iacute;ndice de qualidade de vida urbana, estatura e &iacute;ndice de massa corporal. Para a compara&ccedil;&atilde;o das m&eacute;dias, foi utilizada a an&aacute;lise de vari&acirc;ncia, e para a compara&ccedil;&atilde;o de propor&ccedil;&otilde;es, o teste quiquadrado. As vari&aacute;veis associadas a n&iacute;veis mais elevados de press&atilde;o arterial foram inclu&iacute;das em an&aacute;lise de regress&atilde;o linear m&uacute;ltipla. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <strong>Resultados:</strong> Na an&aacute;lise univariada, n&iacute;veis mais elevados de press &atilde;o arterial sist&oacute;lica e diast&oacute;lica estiveram associados com crian&ccedil;as de cor branca, crian&ccedil;as da regi&atilde;o com alto &iacute;ndice de qualidade de vida urbana e com elevado &iacute;ndice de massa corporal. Na an&aacute;lise multivariada, apenas o &iacute;ndice de massa corporal, o &iacute;ndice de qualidade de vida urbana e a estatura mantiveram-se associados com n&iacute;veis elevados de press&atilde;o sist&oacute;lica. Em rela&ccedil;&atilde;o aos n&iacute;veis mais elevados de press&atilde;o arterial diast&oacute;lica, apenas as vari&aacute;veis &iacute;ndice de qualidade de vida urbana e idade foram mantidas no modelo ap&oacute;s o ajustamento. </font></P>     ]]></body>
<body><![CDATA[<P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <strong>Conclus&atilde;o:</strong> O sobrepeso e a obesidade estiveram associados com n&iacute;veis mais elevados de press&atilde;o arterial sist&oacute;lica. Outros fatores, n&atilde;o identi&#64257;cados, foram parcialmente associados a n&iacute;veis mais elevados de press&atilde;o arterial de crian&ccedil;as do estabelecimento privado do ensino. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> J Pediatr (Rio J). 2004;80(1):29-34: Fatores de risco, obesidade, sobrepeso, etnia, estudo transversal. </font></P> <hr> <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>Summary </strong></font>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <strong>Objective:</strong> To identify factors associated with increased arterial blood pressure in children. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <strong>Methods:</strong> In this cross-sectional study, arterial blood pressure was measured in 672 children between 2 and 11 years of age from two schools in the city of Belo Horizonte, Brazil. After providing informed consent, all children had their blood pressure and anthropometric parameters measured. Blood pressure was measured based on the recommendations of the Update on the 1987 Task Force Report on High Blood Pressure in Children and Adolescents. The following variables were assessed: age, sex, race, urban life quality index, weight, height, and body mass index. Analysis of variance was used for comparison of means and the chi-square was used for comparison of proportions. Variables associated with increased blood pressure were included in a multiple regression model. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <strong>Results:</strong> According to univariate analysis, increased systolic and diastolic blood pressure were associated with high urban life quality index, white race and high body mass index. On multivariate analysis, body mass index, urban life quality index and height remained associated with increased systolic blood pressure; urban life quality index and age were associated with increased diastolic blood pressure. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <strong>Conclusion:</strong> In this study, excess weight and obesity were associated with increased systolic blood pressure. Other unidenti&#64257;ed factors were partially associated with increased blood pressure in children from the school with elevated urban life quality index. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> J Pediatr (Rio J). 2004;80(1):29-34: Risk factors, obesity, overweight, race, cross-sectional study. </font></P> <hr> <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>Introdu&ccedil;&atilde;o </strong></font>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> A mensura&ccedil;&atilde;o da press&atilde;o arterial &eacute; hoje reconhecida como um componente importante da rotina pedi&aacute;trica<Sup>1</Sup>. A opini&atilde;o convencional de que a hipertens&atilde;o na crian&ccedil;a &eacute; um evento raro e, na maioria das vezes, secund&aacute;rio a uma doen&ccedil;a renal tem sido questionada por estudos epidemiol&oacute;gicos que t&ecirc;m mostrado um aumento da preval&ecirc;ncia de hipertens&atilde;o essencial na faixa et&aacute;ria pedi&aacute;trica <Sup>2</Sup>. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">O reconhecimento dessa realidade tem implica&ccedil;&otilde;es para a atua&ccedil;&atilde;o do pediatra na preven&ccedil;&atilde;o de eventos cardiovasculares, pois tem sido demonstrado que a press&atilde;o elevada na inf&acirc;ncia pode ser um fator preditivo de hipertens&atilde;o arterial sist&ecirc;mica na vida adulta. V&aacute;rios estudos de coorte t&ecirc;m encontrado uma signi&#64257;cativa correla&ccedil;&atilde;o entre press&atilde;o arterial elevada em crian&ccedil;as e adolescentes e hipertens&atilde;o na idade adulta <Sup>3,4</Sup>. Crian&ccedil;as com press&atilde;o arterial acima do percentil 90 t&ecirc;m um risco 2,4 vezes maior de ser adultos hipertensos <Sup>5</Sup>. Apesar da hipertens&atilde;o essencial em crian&ccedil;as n&atilde;o se apresentar como fator de risco para eventos cardiovasculares na inf&acirc;ncia, podem-se observar altera&ccedil;&otilde;es cardiovasculares e hemodin&acirc;micas nesses indiv&iacute;duos a partir da segunda d&eacute;cada de vida ou mesmo mais precocemente <Sup>6</Sup>. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Esse novo paradigma na compreens&atilde;o da hipertens&atilde;o na faixa et&aacute;ria pedi&aacute;trica ressalta a necessidade de estudos que investiguem os fatores associados a n&iacute;veis elevados de press&atilde;o arterial. A identi&#64257;ca&ccedil;&atilde;o desses fatores de risco propicia uma oportunidade para que se possa intervir o mais precocemente poss&iacute;vel em uma seq&uuml;&ecirc;ncia de eventos sabidamente associados com signi&#64257;cativa morbidade e mortalidade em adultos. </font></P>     ]]></body>
<body><![CDATA[<P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Alguns fatores t&ecirc;m sido consistentemente reconhecidos como estando associados a n&iacute;veis mais elevados de press&atilde;o arterial na crian&ccedil;a. Dentre eles destacam-se hist&oacute;ria familiar positiva para hipertens&atilde;o arterial sist&ecirc;mica <Sup>7</Sup>, obesidade <Sup>8</Sup> e &iacute;ndice de massa corporal elevado <Sup>9</Sup>. Alguns estudos longitudinais demonstram, ainda, que o baixo peso ao nascimento e o ganho excessivo de peso na inf&acirc;ncia s&atilde;o preditivos de hipertens&atilde;o na vida adulta <Sup>10-12</Sup>. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Em estudo longitudinal de 10 anos de seguimento, Dekkers et al. <Sup>13</Sup> demonstraram que, nos Estados Unidos, diferen&ccedil;as &eacute;tnicas est&atilde;o independentemente associadas a n&iacute;veis mais elevados de press&atilde;o arterial, sendo que crian&ccedil;as e adolescentes da cor negra apresentam n&iacute;veis mais elevados de press&atilde;o diast&oacute;lica. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Este estudo transversal tem como objetivo explorar preliminarmente poss&iacute;veis fatores associados com n&iacute;veis elevados da press&atilde;o arterial em crian&ccedil;as de dois estabelecimentos de ensino (p&uacute;blico e privado) de Belo Horizonte (MG). </font></P>     <div align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>M&eacute;todos </strong></font> </div>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Este &eacute; um estudo transversal no qual foram avaliadas crian&ccedil;as de duas institui&ccedil;&otilde;es de ensino da cidade de Belo Horizonte (MG). Essas institui&ccedil;&otilde;es de ensino s&atilde;o compostas por alunos provenientes de duas regi&otilde;es distintas da cidade de Belo Horizonte, de acordo com o &iacute;ndice de qualidade de vida urbana (IQVU). Esse &iacute;ndice foi desenvolvido pela Prefeitura Municipal de Belo Horizonte com base, dentre outros fatores, em indicadores como renda familiar, condi&ccedil;&otilde;es de sa&uacute;de, assist&ecirc;ncia social, educa&ccedil;&atilde;o e condi&ccedil;&atilde;o habitacional. De acordo com esse &iacute;ndice, a cidade foi dividida em seis regi&otilde;es (classe I a classe VI), em ordem decrescente de qualidade de vida. A primeira institui&ccedil;&atilde;o, p&uacute;blica, freq&uuml;entada por 506 crian&ccedil;as, est&aacute; situada em egi&atilde;o de baixo IQVU (0,33, classe VI). A segunda, uma institui&ccedil;&atilde;o privada, composta por 297 crian&ccedil;as, est&aacute; situada em regi&atilde;o de alto IQVU (0,52, classe II). O estudo foi iniciado ap&oacute;s a aprova&ccedil;&atilde;o do trabalho pelo Comit&ecirc; de &Eacute;tica em Pesquisa da Universidade Federal de Minas Gerais. Os crit&eacute;rios para a inclus&atilde;o no estudo foram: idade entre 2 anos e 10 anos e 11 meses, obten&ccedil;&atilde;o de consentimento informado dos pais e adequada coleta dos dados. Foram exclu&iacute;das da an&aacute;lise crian&ccedil;as abaixo de 2 anos de idade (n = 13), acima de 10 anos e 11 meses (n = 102), portadoras de hipertens&atilde;o arterial (n = 4) e aquelas sem o consentimento informado (n = 12). Foram avaliadas 627 crian&ccedil;as, sendo 409 (61%) provenientes da escola p&uacute;blica e 263 (39%) do sistema privado. As crian&ccedil;as tiveram a press&atilde;o arterial e par&acirc;metros antropom&eacute;tricos medidos por acad&ecirc;micos do quinto ano de medicina, previamente treinados. Atrav&eacute;s de formul&aacute;rio enviado aos respons&aacute;veis pela crian&ccedil;a, foram avaliadas informa&ccedil;&otilde;es sobre a sa&uacute;de da crian&ccedil;a, hist&oacute;ria familiar e fatores de risco para hipertens&atilde;o arterial. A press&atilde;o arterial foi mensurada atrav&eacute;s do m&eacute;todo auscultat&oacute;rio por duas vezes, seguindo os par&acirc;metros estabelecidos pelo relat&oacute;rio do Update on the 1987 Task Force Report on High Blood Pressure in Children and Adolescents <Sup>14 </Sup>(<a href="http://www.nhlbi.nih.gov/health/prof/heart/hbp/%20hbp_ped.htm">http://www.nhlbi.nih.gov/health/prof/heart/hbp/hbp_ped.htm</a>). </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Durante o procedimento, em ambiente controlado, as crian&ccedil;as permaneceram sentadas, e houve um intervalo de 5 minutos entre a primeira e a segunda mensura&ccedil;&atilde;o. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Para a classi&#64257;ca&ccedil;&atilde;o do &iacute;ndice de massa corporal (IMC), considerou-se idade e sexo das crian&ccedil;as. Todos foram classi&#64257;cados em normal, sobrepeso ou obeso, de acordo com Cole et al. <Sup>15</Sup>. Para as an&aacute;lises, as crian&ccedil;as foram divididas em dois grupos de acordo com a faixa et&aacute;ria: pr&eacute;- escolares entre 2 e 6 anos e escolares entre 7 e 10 anos de idade. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Os dados foram computados e analisados pelo SPSS&reg;. Para a compara&ccedil;&atilde;o de propor&ccedil;&otilde;es, foi utilizado o teste do qui-quadrado, e para a compara&ccedil;&atilde;o de m&eacute;dias, o teste de an&aacute;lise de vari&acirc;ncia (ANOVA). Para a an&aacute;lise multivariada, foi utilizada a regress&atilde;o linear m&uacute;ltipla, sendo a press&atilde;o sist&oacute;lica e a press&atilde;o diast&oacute;lica consideradas como vari&aacute;veis-resposta. As vari&aacute;veis independentes estudadas foram idade, estatura, sexo, cor da pele, IQVU e IMC. A metodologia empregada na an&aacute;lise multivariada foi a inclus&atilde;o inicial de todas as vari&aacute;veis signi&#64257;cativas na an&aacute;lise univariada e a posterior exclus&atilde;o, uma a uma, daquelas que n&atilde;o apresentavam contribui&ccedil;&atilde;o signi&#64257;cativa para o modelo (backward elimination). Todos os fatores associados com press&atilde;o arterial mais elevada, considerando um n&iacute;vel de signi&#64257;c&acirc;ncia menor que 0,25, foram inicialmente inclu&iacute;dos na an&aacute;lise multivariada. Ap&oacute;s a obten&ccedil;&atilde;o das vari&aacute;veis preditivas do modelo &#64257;nal, testou-se a ocorr&ecirc;ncia de intera&ccedil;&atilde;o. </font></P>     <div align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>Resultados </strong>  </font> </div>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Foram avaliadas 672 crian&ccedil;as, sendo 343 (51%) do sexo feminino. A idade variou de 2 anos a 10 anos e 11 meses, sendo a m&eacute;dia de 6,9 anos (DP = 2,3). Das 672 crian&ccedil;as, 336 (50%) encontravam-se na faixa et&aacute;ria de 2 anos a 6 anos e 11 meses, e os demais 336 (50%), na faixa et&aacute;ria de 7 anos a 10 anos e 11 meses. N&atilde;o houve diferen&ccedil;a signi&#64257;cativa de idade entre os sexos (p = 0,95). A cor da pele foi avaliada em 671 (99,7%) indiv&iacute;duos, sendo 307 (45,7%) considerados brancos e 364 (54,2%) n&atilde;obrancos (pardos e negros). </font></P>     ]]></body>
<body><![CDATA[<P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A <a href="#f1">Figura 1</a> apresenta a distribui&ccedil;&atilde;o de freq&uuml;&ecirc;ncia da idade das crian&ccedil;as inclu&iacute;das no estudo, correlacionada com o sexo. </font></P>     <P align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a name="f1"></a><img src="/img/revistas/rbp/v45n3/figura_1_9.gif" width="359" height="248"></font><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Houve predom&iacute;nio de crian&ccedil;as do sexo masculino na escola privada (53%) quando comparado com a escola p&uacute;blica (46%), sendo a diferen&ccedil;a signi&#64257;cativa (p = 0,03). </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Houve uma marcante diferen&ccedil;a em rela&ccedil;&atilde;o &agrave; cor da pele. </font> </P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Dos 307 alunos brancos, 247 (80%) freq&uuml;entavam o sistema privado de ensino; por outro lado, 348 (96%) dos 364 alunos de cor parda ou negra freq&uuml;entavam </font><font size="2" face="Verdana, Arial, Helvetica, sans-serif">o sistema p&uacute;blico de ensino (p &lt; 0,001). O IMC apresentou a seguinte distribui&ccedil;&atilde;o: 553 (82,3%) crian&ccedil;as apresentavam valores adequados para a idade e o sexo; 94 (14%) apresentavam sobrepeso; e 25 (3,7%) apresentavam valores compat&iacute;veis com obesidade. Houve associa&ccedil;&atilde;o signi&#64257;cativa entre o IMC e a origem da crian&ccedil;a: das 263 crian&ccedil;as do sistema privado, 62 (23,5%) apresentavam sobrepeso ou obesidade; das 409 crian&ccedil;as do sistema p&uacute;blico, 57 (14%) apresentavam essa caracter&iacute;stica (p = 0,001). Tamb&eacute;m houve associa&ccedil;&atilde;o entre cor branca e IMC elevado. Das 307 crian&ccedil;as consideradas brancas, 66 (21,5%) apresentavam sobrepeso ou obesidade; das 364 crian&ccedil;as n&atilde;o-brancas 53 (14,5%) apresentavam essa caracter&iacute;stica (p = 0,013). </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Na an&aacute;lise univariada de fatores de risco de eleva&ccedil;&atilde;o da press&atilde;o arterial, os seguintes fatores foram inclu&iacute;dos: sexo, cor da pele, IQVU e IMC. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Na <a href="#t1">Tabela 1</a> podem ser observadas as compara&ccedil;&otilde;es entre as m&eacute;dias da press&atilde;o arterial sist&oacute;lica e da press&atilde;o arterial diast&oacute;lica e os fatores de risco estudados. Nessas an&aacute;lises, as crian&ccedil;as foram estrati&#64257;cadas pela idade (pr&eacute;-escolares e escolares). As m&eacute;dias de press&atilde;o arterial sist&oacute;lica foram signi&#64257;cativamente mais elevadas nas crian&ccedil;as brancas, nas crian&ccedil;as provenientes da escola com elevado IQVU e nas crian&ccedil;as com IMC elevado, independentemente da faixa et&aacute;ria. N&atilde;o houve diferen&ccedil;a significativa entre os sexos. As m&eacute;dias de press&atilde;o arterial diast&oacute;lica foram signi&#64257;cativamente mais elevadas nas crian&ccedil;as brancas e nas crian&ccedil;as provenientes da escola com elevado IQVU, independentemente da idade. </font></P>     <P align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a name="t1"></a><img src="/img/revistas/rbp/v45n3/tabla_1_9.gif" width="483" height="322"></font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> As crian&ccedil;as com IMC elevado somente apresentaram m&eacute;dias mais elevadas de press&atilde;o diast&oacute;lica na idade pr&eacute;-escolar. Tamb&eacute;m n&atilde;o houve diferen&ccedil;a signi&#64257;cativa entre os sexos em rela&ccedil;&atilde;o &agrave; press&atilde;o arterial diast&oacute;lica. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">As Figuras <a href="#f2">2</a> e <a href="#f3">3</a> ilustram, respectivamente, as diferen&ccedil;as das m&eacute;dias de press&atilde;o arterial sist&oacute;lica e diast&oacute;lica entre as crian&ccedil;as brancas e n&atilde;o-brancas. Pode ser observado que as m&eacute;dias da press&atilde;o sist&oacute;lica e da press&atilde;o diast&oacute;lica s&atilde;o persistentemente mais elevadas nas crian&ccedil;as de cor branca, especialmente ap&oacute;s 4 anos de idade. </font></P>     ]]></body>
<body><![CDATA[<P align="center"><a name="f2"></a><img src="/img/revistas/rbp/v45n3/figura_2_9.gif" width="340" height="302">    <br>   <a name="f3"></a><img src="/img/revistas/rbp/v45n3/figura_3_9.gif" width="342" height="300"></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Na <a href="#f4">Figura 4</a> pode-se observar que, com o aumento do IMC, houve um signi&#64257;cativo aumento da press&atilde;o arterial sist&oacute;lica. Entretanto, essa associa&ccedil;&atilde;o n&atilde;o foi observada para a press&atilde;o diast&oacute;lica; as crian&ccedil;as obesas apresentaram n&iacute;veis menores de press&atilde;o diast&oacute;lica.</font></P>     <P align="center"><a name="f4"></a><img src="/img/revistas/rbp/v45n3/tabla_4_9.gif" width="353" height="340"></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Para identi&#64257;car as vari&aacute;veis independentemente associadas &agrave;s m&eacute;dias de press&atilde;o arterial mais elevadas, foi constru&iacute;do um modelo de regress&atilde;o linear m&uacute;ltipla incorporandose as vari&aacute;veis associadas com m&eacute;dias de press&atilde;o arterial mais elevadas, al&eacute;m da estatura da crian&ccedil;a. Os resultados para a press&atilde;o arterial sist&oacute;lica e a diast&oacute;lica podem ser observados nas Tabelas <a href="#t2">2</a> e <a href="#t3">3</a>, respectivamente. </font></P>     <P align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a name="t2"></a><img src="/img/revistas/rbp/v45n3/tabla_2_9.gif" width="354" height="223">    <br>     <a name="t3"></a><img src="/img/revistas/rbp/v45n3/tabla_3_9.gif" width="347" height="224"></font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> No modelo para press&atilde;o sist&oacute;lica, tr&ecirc;s vari&aacute;veis permaneceram signi&#64257;cativas: IMC, IQVU e estatura. N&atilde;o houve intera&ccedil;&atilde;o entre esses fatores. No modelo </font><font size="2" face="Verdana, Arial, Helvetica, sans-serif">da press&atilde;o diast&oacute;lica, duas vari&aacute;veis permaneceram signi&#64257;cativas: idade e IVQU. N&atilde;o houve intera&ccedil;&atilde;o entre essas vari&aacute;veis. A cor da pele n&atilde;o esteve inde </font><font size="2"> </font></P> <font face="Verdana, Arial, Helvetica, sans-serif"><font size="2">     <p align="justify"><strong>Discuss&atilde;o </strong></p>     <P align="justify"> O presente estudo se caracteriza por ser uma avalia&ccedil;&atilde;o transversal da press&atilde;o arterial de estudantes de duas escolas de Belo Horizonte. A amostra n&atilde;o foi selecionada aleatoriamente. Embora em nosso estudo o n&uacute;mero de estudantes avaliados tenha sido expressivo, pode ter havido v&iacute;cios de sele&ccedil;&atilde;o inerentes a amostras selecionadas de maneira n&atilde;o rand&ocirc;mica. Apesar dessa ressalva, alguns achados obtidos merecem ser comentados e podem contribuir para o desenvolvimento de estudos prospectivos especialmente desenhados para identi&#64257;car grupos de risco de press&atilde;o arterial elevada na faixa et&aacute;ria pedi&aacute;trica. </P>     ]]></body>
<body><![CDATA[<P align="justify">Em nosso estudo, na an&aacute;lise univariada, as m&eacute;dias mais elevadas de press&atilde;o arterial sist&oacute;lica e diast&oacute;lica estiveram signi&#64257;cativamente associadas com crian&ccedil;as de cor branca, crian&ccedil;as provenientes da regi&atilde;o com elevado IQVU e crian&ccedil;as com IMC elevado. A an&aacute;lise de regress&atilde;o linear m&uacute;ltipla para a press&atilde;o sist&oacute;lica demonstrou que a cor da pele n&atilde;o explicava este achado, e, assim, essa vari&aacute;vel foi exclu&iacute;da do modelo. Apesar da associa&ccedil;&atilde;o de &iacute;ndices elevados de massa corporal com crian&ccedil;as do estabelecimento privado de ensino, a an&aacute;lise multivariada demonstrou que ambas as vari&aacute;veis mantinham signi&#64257;c&acirc;ncia e explicavam, em parte, as m&eacute;dias de press&atilde;o sist&oacute;lica mais elevadas nessas crian&ccedil;as. Em outras palavras, o IMC elevado n&atilde;o foi respons&aacute;vel isoladamente pelas m&eacute;dias mais elevadas de press&atilde;o arterial sist&oacute;lica. </P>     <P align="justify">Em rela&ccedil;&atilde;o &agrave; press&atilde;o diast&oacute;lica, apenas as vari&aacute;veis IQVU e idade foram mantidas no modelo ap&oacute;s o ajustamento. </P>     <P align="justify">Cor da pele, sexo e IMC n&atilde;o estiveram independentemente associados a n&iacute;veis mais elevados de press&atilde;o diast&oacute;lica. </P>     <P align="justify">Apesar do IMC ter sido um forte fator associado a n&iacute;veis elevados de press&atilde;o arterial em nosso estudo, outros fatores precisam ser identi&#64257;cados e dimensionados. Evidentemente, a vari&aacute;vel IQVU representa, na popula&ccedil;&atilde;o estudada, a origem social do indiv&iacute;duo. Pode-se especular que outros fatores associados ao estilo de vida, &agrave; alimenta&ccedil;&atilde;o e ao ambiente de vida possam ter contribu&iacute;do para a ocorr&ecirc;ncia de m&eacute;dias consistentemente mais elevadas nas crian&ccedil;as provenientes de regi&otilde;es com alto &iacute;ndice de qualidade de vida. </P>     <P align="justify">Alguns fatores de risco avaliados em nosso estudo t&ecirc;m sido reconhecidos como estando associados a n&iacute;veis mais elevados de press&atilde;o arterial. Estudos longitudinais em popula&ccedil;&otilde;es adultas t&ecirc;m demonstra-do que o ganho de peso excessivo est&aacute; fortemente associado ao risco de doen&ccedil;as cardiovasculares <Sup>16-18</Sup>. Tem sido tamb&eacute;m reconhecido que esses problemas no adulto t&ecirc;m sua origem na inf&acirc;ncia <Sup>19,20</Sup>. </P> </font></font>    <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Recentemente, Sinaiko et al. <Sup>21</Sup>, em estudo prospectivo no qual 679 crian&ccedil;as foram acompanhadas at&eacute; a idade de 23 anos, com medidas seriadas de press&atilde;o arterial e medidas antropom&eacute;tricas, demonstraram que o ganho de peso e o aumento do IMC durante a inf&acirc;ncia estiveram significativamente associados aos n&iacute;veis de insulina e de l&iacute;pides e &agrave; press&atilde;o arterial dos adultos jovens. He et al. <Sup>22</Sup>, em um estudo pareado (uma crian&ccedil;a obesa : uma n&atilde;o-obesa) de 1.322 crian&ccedil;as na China, mostraram que a diferen&ccedil;a m&eacute;dia entre os pares foi de aproximadamente 5 mmHg de press&atilde;o sist&oacute;lica e 4 mmHg de press&atilde;o diast&oacute;lica, sendo que os n&iacute;veis mais elevados foram apresentados pelas crian&ccedil;as obesas. Entre estas, 19,4% apresentavam n&iacute;veis press&oacute;ricos acima do percentil 95, enquanto que entre as crian&ccedil;as com IMC adequado este percentual atingiu 7%. Em um grande estudo multic&ecirc;ntrico realizado nos Estados Unidos, Rosner et al. <Sup>23</Sup> estudaram as diferen&ccedil;as na press&atilde;o arterial de crian&ccedil;as e adolescentes considerando-se especialmente a cor da pele e o IMC. Os autores mostraram que, entre as crian&ccedil;as, as de cor branca apresentavam n&iacute;veis mais elevados de press&atilde;o arterial sist&oacute;lica. Quando o papel do IMC foi estudado, demonstrou-se que os maiores n&iacute;veis de IMC resultavam em n&iacute;veis mais elevados de press&atilde;o arterial em todos os grupos. Entretanto, o IMC pareceu exercer mais in&#64258;u&ecirc;ncia sobre a press&atilde;o arterial sist&oacute;lica das crian&ccedil;as brancas do sexo masculino. </font></P> <font face="Verdana, Arial, Helvetica, sans-serif"><font size="2">    <P align="justify">Alguns estudos t&ecirc;m demonstrado que o curso cl&iacute;nico inicial da hipertens&atilde;o em crian&ccedil;as obesas &eacute; caracterizado por preponder&acirc;ncia de hipertens&atilde;o sist&oacute;lica isolada. Em recente estudo de rastreamento de hipertens&atilde;o e obesidade em escolares, Sorof et al. <Sup>9</Sup> demonstraram uma preval&ecirc;ncia de 94% de hipertens&atilde;o sist&oacute;lica isolada nos adolescentes. </P>     <P align="justify">Os mecanismos &#64257;siopatol&oacute;gicos associados &agrave; hipertens&atilde;o sist&oacute;lica isolada s&atilde;o ainda desconhecidos, e claramente s&atilde;o necess&aacute;rios estudos para investigar as causas e a melhor abordagem desses indiv&iacute;duos<font size="2" face="Verdana, Arial, Helvetica, sans-serif"><Sup>2</Sup>. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Em conjunto, esses dados mostram que, desde a inf&acirc;ncia, o sobrepeso e a obesidade possivelmente desempenham um papel delet&eacute;rio para o sistema cardiovascular. </font></P> </font></font>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Recentemente, Sorof &amp; Daniels <Sup>2</Sup> ressaltaram a import&acirc;ncia da hipertens&atilde;o por obesidade em crian&ccedil;as e adolescentes e a propor&ccedil;&atilde;o epid&ecirc;mica que esta doen&ccedil;a tem representado. </font></P>     ]]></body>
<body><![CDATA[<P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Obesidade &eacute; o mais comum problema nutricional na inf&acirc;ncia nos pa&iacute;ses desenvolvidos. Muitos dos eventos, t&iacute;picos da idade adulta, associados &agrave; obesidade tais como hipertens &atilde;o, diabetes mellitus tipo 2, dislipidemia, hipertro&#64257;a ventricular esquerda, esteatose hep&aacute;tica, entre outras j&aacute; t&ecirc;m sido diagnosticados na faixa et&aacute;ria pedi&aacute;trica. Nos &uacute;ltimos 50 anos, gra&ccedil;as aos estudos cl&iacute;nicos e epidemiol&oacute;gicos que possibilitaram o reconhecimento dos fatores de risco envolvidos nas doen&ccedil;as cardiovasculares, tem sido observado um decl&iacute;nio na morbidade e mortalidade atribu&iacute;da a essas condi&ccedil;&otilde;es. O aumento na preval&ecirc;ncia e gravidade da obesidade entre crian&ccedil;as e adolescentes &eacute; preocupante, pois pode provocar uma revers&atilde;o deste quadro e comprometer todos os esfor&ccedil;os obtidos nos &uacute;ltimos anos <Sup>24</Sup>. </font></P>     <P align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Concluindo, embora nosso estudo transversal tenha limita&ccedil;&otilde;es, chama a aten&ccedil;&atilde;o sobre a import&acirc;ncia do pediatra para a monitora&ccedil;&atilde;o da press&atilde;o arterial rotineira de crian&ccedil;as e para a identi&#64257;ca&ccedil;&atilde;o precoce de fatores de risco como sobrepeso e obesidade na preven&ccedil;&atilde;o de eventos cardiovasculares no futuro. Esta abordagem &eacute; ainda negligenciada em nosso meio. No estudo de press&atilde;o arterial em escolares de Belo Horizonte, por exemplo, Oliveira et al. <Sup>25</Sup> mostraram que menos da metade dos participantes do estudo (m&eacute;dia de idade de 11,5 anos) j&aacute; haviam sido sub-metidos anteriormente a alguma medida da press&atilde;o arterial. Esta observa&ccedil;&atilde;o chama a aten&ccedil;&atilde;o para a necessidadede se estabelecer a mensura&ccedil;&atilde;o da press&atilde;o arterial como parte integrante do exame pedi&aacute;trico. Deve ser ressaltada, ainda, a necessidade da realiza&ccedil;&atilde;o de estudos longitudinais multic&ecirc;ntricos em nosso meio com mensura&ccedil;&otilde;es peri&oacute;dicas da press&atilde;o arterial, com o objetivo de identi&#64257;car outros fatores determinantes de n&iacute;veis mais elevados de press&atilde;o arterial na faixa et&aacute;ria pedi&aacute;trica. </font></P>     <p align="justify"><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><strong>Refer&ecirc;ncias </strong></font></p>     <!-- ref --><p align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">1. Sinaiko AR. Hypertension in children. N Engl J Med.1996;335:1968-73.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=414002&pid=S1024-0675200600030000900001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">2. Sorof J, Daniels S. Obesity hypertension in children: a problem of epidemic proportions. Hypertension 2002;40:441-7.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=414003&pid=S1024-0675200600030000900002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">3. Bao W, Threefoot SA, Srinivasan SR, Berenson GS. 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J Clin Epidemiol 1997;50:571-9.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=414005&pid=S1024-0675200600030000900004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">5. Mahoney LT, Clarke WR, Burns TL, Lauer RM. Childhood predictors of high blood pressure. Am J Hypertens 1991;4: S608-10.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=414006&pid=S1024-0675200600030000900005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">6. Daniels SR. 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