<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.1 20151215//EN" "https://jats.nlm.nih.gov/publishing/1.1/JATS-journalpublishing1.dtd">
<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" article-type="letter" dtd-version="1.1" specific-use="sps-1.9" xml:lang="en">
  <front>
    <journal-meta>
      <journal-id journal-id-type="nlm-ta">Arq Bras Cardiol</journal-id>
      <journal-id journal-id-type="publisher-id">abc</journal-id>
      <journal-title-group>
        <journal-title>Arquivos Brasileiros de Cardiologia</journal-title>
        <abbrev-journal-title abbrev-type="publisher">Arq. Bras. Cardiol.</abbrev-journal-title>
      </journal-title-group>
      <issn pub-type="ppub">0066-782X</issn>
      <issn pub-type="epub">1678-4170</issn>
      <publisher>
        <publisher-name>Sociedade Brasileira de Cardiologia - SBC</publisher-name>
      </publisher>
    </journal-meta>
    <article-meta>
      <article-id pub-id-type="publisher-id" specific-use="scielo-v3">zVCgh6QHrG6HYzwk9R3xd5p</article-id>
      <article-id pub-id-type="publisher-id" specific-use="scielo-v2">S0066-782X2020000100136</article-id>
      <article-id pub-id-type="doi">10.36660/abc.20190708</article-id>
      <article-categories>
        <subj-group subj-group-type="heading">
          <subject>Letter to the Editor</subject>
        </subj-group>
      </article-categories>
      <title-group>
        <article-title>Left Ventricle Mass Index, a Confounding Variable of Global Longitudinal Strain to be Noticed</article-title>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author">
          <contrib-id contrib-id-type="orcid">0000-0003-0454-6740</contrib-id>
          <name>
            <surname>Correia</surname>
            <given-names>Eduardo Thadeu de Oliveira</given-names>
          </name>
          <xref ref-type="aff" rid="aff1">1</xref>
          <xref ref-type="corresp" rid="c1"/>
        </contrib>
        <contrib contrib-type="author">
          <contrib-id contrib-id-type="orcid">0000-0002-4945-7402</contrib-id>
          <name>
            <surname>Barbetta</surname>
            <given-names>Let&#237;cia Mara dos Santos</given-names>
          </name>
          <xref ref-type="aff" rid="aff1">1</xref>
        </contrib>
        <aff id="aff1">
          <label>1</label>
          <institution content-type="orgname">Hospital Universit&#225;rio Ant&#244;nio Pedro</institution>
          <addr-line>
            <city>Niter&#243;i</city>
            <state>RJ</state>
          </addr-line>
          <country country="BR">Brazil</country>
          <institution content-type="original">Hospital Universit&#225;rio Ant&#244;nio Pedro, Niter&#243;i, RJ - Brazil</institution>
        </aff>
      </contrib-group>
      <author-notes>
        <corresp id="c1"><bold>Mailing Address: Eduardo Thadeu de Oliveira Correia,</bold> Hospital Universit&#225;rio Ant&#244;nio Pedro - Avenida Marqu&#234;s do Paran&#225;, 303. Postal Code 24033-900, Centro, Niter&#243;i, RJ - Brazil. E-mail: <email>etocorreia@outlook.com</email>
				</corresp>
      </author-notes>
      <pub-date date-type="pub" publication-format="electronic">
        <day>10</day>
        <month>02</month>
        <year>2020</year>
      </pub-date>
      <pub-date date-type="collection" publication-format="electronic">
        <month>01</month>
        <year>2020</year>
      </pub-date>
      <volume>114</volume>
      <issue>1</issue>
      <fpage>136</fpage>
      <lpage>136</lpage>
      <permissions>
        <license license-type="open-access" xlink:href="https://creativecommons.org/licenses/by/4.0/" xml:lang="en">
          <license-p>This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p>
        </license>
      </permissions>
      <kwd-group xml:lang="en">
        <title>Keywords:</title>
        <kwd>Ventricular Function, Left</kwd>
        <kwd>Cardiomyopathy, Hypertrophic</kwd>
        <kwd>Hypertension</kwd>
        <kwd>Strain</kwd>
        <kwd>Heart Failure</kwd>
        <kwd>Hypertrophy, Left Ventricular</kwd>
      </kwd-group>
    </article-meta>
  </front>
  <body>
    <p>
      <bold>Dear Editor,</bold>
    </p>
    <p>We read with great interest the article entitled as &#8220;Strain Analysis of Left Ventricular Function in the Association of Hypertrophic Cardiomyopathy and Systemic Arterial Hypertension&#8221;. In this paper, the authors evaluated the global longitudinal strain (GLS) of the left ventricle (LV) in two distinct groups: patients with hypertrophic cardiomyopathy (HCM) and patients with HCM and systemic arterial hypertension (SAH) and demonstrated that GLS was lower in the second group. This important finding may indicate greater impairment of LV function in patients with SAH and HCM.<xref ref-type="bibr" rid="B1">1</xref>
		</p>
    <p>However, despite these findings, it is important to notice the impact of the LV mass on the GLS, unfortunately not reported by the authors. A previous study by Soufi Taleb Bendiab et al.<xref ref-type="bibr" rid="B2">2</xref> showed that hypertensive patients with LV hypertrophy had a reduced GLS.<xref ref-type="bibr" rid="B2">2</xref> Moreover, in the study of L&#243;pes-Candales et al.<xref ref-type="bibr" rid="B3">3</xref> patients with increased LV mass had a significant reduced GLS.<xref ref-type="bibr" rid="B3">3</xref> From a mechanical point of view of a physiological heart model validated by echocardiography, the volume of heart tissue is constant throughout the cardiac cycle, since it is incompressible.<xref ref-type="bibr" rid="B4">4</xref> In that way, patients with increased LV thickness would have less longitudinal myocardial deformation.<xref ref-type="bibr" rid="B3">3</xref>
		</p>
    <p>Since the population of this study were patients with hypertrophic cardiomyopathy with or without hypertension, the measurement of LV mass becomes even more important to report an accurate multivariate analysis and to measure the impact of this important confounder on the study&#8217;s conclusions.</p>
  </body>
  <back>
    <ref-list>
      <title>References</title>
      <ref id="B1">
        <label>1</label>
        <mixed-citation>1 Gil TGP, Castier MB, Gondar AFP, Sales AF, Santos M de O, Lima FC da S de, Mourilhe-Rocha R. Strain Analysis of Left Ventricular Function in the Association of Hypertrophic Cardiomyopathy and Systemic Arterial Hypertension. Arq Bras Cardiol. 2019;113(4):677-684.</mixed-citation>
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              <surname>Gil</surname>
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            </name>
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              <surname>Castier</surname>
              <given-names>MB</given-names>
            </name>
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              <surname>Gondar</surname>
              <given-names>AFP</given-names>
            </name>
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              <surname>Sales</surname>
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              <surname>Santos</surname>
              <given-names>M de O</given-names>
            </name>
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              <surname>Lima</surname>
              <given-names>FC da S de</given-names>
            </name>
            <name>
              <surname>Mourilhe-Rocha</surname>
              <given-names>R</given-names>
            </name>
          </person-group>
          <article-title>Strain Analysis of Left Ventricular Function in the Association of Hypertrophic Cardiomyopathy and Systemic Arterial Hypertension</article-title>
          <source>Arq Bras Cardiol</source>
          <year>2019</year>
          <volume>113</volume>
          <issue>4</issue>
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          <lpage>684</lpage>
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        <label>2</label>
        <mixed-citation>2 Soufi Taleb Bendiab N, Meziane-Tani A, Ouabdesselam S, Methia N, Latreche S, Henaoui L, et al. Factors associated with global longitudinal strain decline in hypertensive patients with normal left ventricular ejection fraction. Eur J Prev Cardiol. 2017;24(14):1463-72.</mixed-citation>
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              <surname>Soufi Taleb Bendiab</surname>
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            </name>
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              <surname>Meziane-Tani</surname>
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              <surname>Ouabdesselam</surname>
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              <surname>Henaoui</surname>
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          <article-title>Factors associated with global longitudinal strain decline in hypertensive patients with normal left ventricular ejection fraction</article-title>
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        <label>3</label>
        <mixed-citation>3 L&#243;pez-Candales A. Automated functional imaging for assessment of left ventricular mechanics in the presence of left ventricular hypertrophy. Echocardiography. 2014;31(5):605-14.</mixed-citation>
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              <surname>L&#243;pez-Candales</surname>
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          <article-title>Automated functional imaging for assessment of left ventricular mechanics in the presence of left ventricular hypertrophy</article-title>
          <source>Echocardiography</source>
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        <label>4</label>
        <mixed-citation>4 Ghosh E, Shmuylovich L, Kov&#225;cs SJ. Vortex formation time-to-left ventricular early rapid filling relation: model-based prediction with echocardiographic validation. J Appl Physiol. 2010;109(6):1812-9.</mixed-citation>
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            <name>
              <surname>Ghosh</surname>
              <given-names>E</given-names>
            </name>
            <name>
              <surname>Shmuylovich</surname>
              <given-names>L</given-names>
            </name>
            <name>
              <surname>Kov&#225;cs</surname>
              <given-names>SJ</given-names>
            </name>
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          <article-title>Vortex formation time-to-left ventricular early rapid filling relation: model-based prediction with echocardiographic validation</article-title>
          <source>J Appl Physiol</source>
          <year>2010</year>
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  </back>
  <sub-article article-type="translation" id="s1" xml:lang="pt">
    <front-stub>
      <article-categories>
        <subj-group subj-group-type="heading">
          <subject>Carta ao Editor</subject>
        </subj-group>
      </article-categories>
      <title-group>
        <article-title>O &#205;ndice de Massa do Ventr&#237;culo Esquerdo: Uma Vari&#225;vel Confundidora do <italic>Strain</italic> Longitudinal Global a ser Observada</article-title>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author">
          <contrib-id contrib-id-type="orcid">0000-0003-0454-6740</contrib-id>
          <name>
            <surname>Correia</surname>
            <given-names>Eduardo Thadeu de Oliveira</given-names>
          </name>
          <xref ref-type="aff" rid="aff2">1</xref>
          <xref ref-type="corresp" rid="c2"/>
        </contrib>
        <contrib contrib-type="author">
          <contrib-id contrib-id-type="orcid">0000-0002-4945-7402</contrib-id>
          <name>
            <surname>Barbetta</surname>
            <given-names>Let&#237;cia Mara dos Santos</given-names>
          </name>
          <xref ref-type="aff" rid="aff2">1</xref>
        </contrib>
        <aff id="aff2">
          <label>1</label>
          <institution content-type="original">Hospital Universit&#225;rio Ant&#244;nio Pedro, Niter&#243;i, RJ - Brasil</institution>
        </aff>
      </contrib-group>
      <author-notes>
        <corresp id="c2"><bold>Correspond&#234;ncia: Eduardo Thadeu de Oliveira Correia,</bold> Hospital Universit&#225;rio Ant&#244;nio Pedro - Avenida Marqu&#234;s do Paran&#225;, 303. CEP 24033-900, Centro, Niter&#243;i, RJ - Brasil. E-mail: <email>etocorreia@outlook.com</email>
				</corresp>
      </author-notes>
      <kwd-group xml:lang="pt">
        <title>Palavras-chave</title>
        <kwd>Fun&#231;&#227;o Ventricular Esquerda</kwd>
        <kwd>Cardiomiopatia Hipertr&#243;fica</kwd>
        <kwd>Hipertens&#227;o</kwd>
        <kwd>Strain</kwd>
        <kwd>Insufici&#234;ncia Card&#237;aca</kwd>
        <kwd>Hipertrofia Ventricular Esquerda</kwd>
      </kwd-group>
    </front-stub>
    <body>
      <p>
        <bold>Caro Editor,</bold>
      </p>
      <p>N&#243;s lemos, com grande interesse, o artigo intitulado &#8220;Avalia&#231;&#227;o da Fun&#231;&#227;o Ventricular Esquerda na Associa&#231;&#227;o de Cardiomiopatia Hipertr&#243;fica e Hipertens&#227;o Arterial Sist&#234;mica pela T&#233;cnica de <italic>Strain</italic>&#8221;. Nesse trabalho, os autores avaliaram o <italic>strain</italic> longitudinal global (SLG) do ventr&#237;culo esquerdo (VE) em dois grupos distintos: pacientes portadores de cardiomiopatia hipertr&#243;fica (CMH) e pacientes portadores de CMH com hipertens&#227;o arterial sist&#234;mica (HAS), e demonstraram que o SLG foi menor no segundo grupo. Essa importante descoberta pode indicar um maior comprometimento da fun&#231;&#227;o do VE nos pacientes com HAS e CMH.<xref ref-type="bibr" rid="B1">1</xref>
			</p>
      <p>Entretanto, apesar dessas descobertas, &#233; importante observar o impacto da massa do VE sobre o SLG, infelizmente, n&#227;o relatado pelos autores. Um estudo anterior desenvolvido por Soufi Taleb Bendiab et al.,<xref ref-type="bibr" rid="B2">2</xref> mostrou que os pacientes hipertensos com hipertrofia do VE apresentaram uma redu&#231;&#227;o do SLG.<xref ref-type="bibr" rid="B2">2</xref> Al&#233;m disso, no estudo de L&#243;pes-Candales et al.,<xref ref-type="bibr" rid="B3">3</xref> os pacientes com aumento da massa do VE tiveram uma redu&#231;&#227;o significativa o SLG.<xref ref-type="bibr" rid="B3">3</xref> Do ponto de vista mec&#226;nico de um modelo card&#237;aco fisiol&#243;gico validado pelo ecocardiograma, o volume do tecido card&#237;aco &#233; constante ao longo do ciclo card&#237;aco, uma vez que ele &#233; incompress&#237;vel.<xref ref-type="bibr" rid="B4">4</xref> Desse modo, os pacientes com aumento da espessura do VE apresentariam menor deforma&#231;&#227;o mioc&#225;rdica longitudinal.<xref ref-type="bibr" rid="B3">3</xref>
			</p>
      <p>Uma vez que a popula&#231;&#227;o desse estudo foi composta por pacientes portadores de cardiomiopatia hipertr&#243;fica com ou sem hipertens&#227;o, o c&#225;lculo da massa do VE se torna ainda mais importante para relatar uma an&#225;lise multivariada e mensurar o impacto desse importante fator confundidor nas conclus&#245;es do estudo.</p>
    </body>
  </sub-article>
</article>
