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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Prevalence and impact of cardiovascular metabolic diseases on COVID-19 in China</title>
<author><name sortKey="Li, Bo" sort="Li, Bo" uniqKey="Li B" first="Bo" last="Li">Bo Li</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Cardiology, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Yang, Jing" sort="Yang, Jing" uniqKey="Yang J" first="Jing" last="Yang">Jing Yang</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Cardiology, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="Aff2"><institution-wrap><institution-id institution-id-type="GRID">grid.440653.0</institution-id>
<institution-id institution-id-type="ISNI">0000 0000 9588 091X</institution-id>
<institution>Binzhou Medical University,</institution>
</institution-wrap>
No. 346, Guanhai Road, Laishan District, Yantai, 264003 Shandong People’s Republic of China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Zhao, Faming" sort="Zhao, Faming" uniqKey="Zhao F" first="Faming" last="Zhao">Faming Zhao</name>
<affiliation><nlm:aff id="Aff3">Department of Infectious Diseases, No. 4 Hospital of Zibo, No. 210, Shan Quan Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Zhi, Lili" sort="Zhi, Lili" uniqKey="Zhi L" first="Lili" last="Zhi">Lili Zhi</name>
<affiliation><nlm:aff id="Aff4"><institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Allergy, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Wang, Xiqian" sort="Wang, Xiqian" uniqKey="Wang X" first="Xiqian" last="Wang">Xiqian Wang</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Cardiology, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Liu, Lin" sort="Liu, Lin" uniqKey="Liu L" first="Lin" last="Liu">Lin Liu</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Cardiology, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Bi, Zhaohui" sort="Bi, Zhaohui" uniqKey="Bi Z" first="Zhaohui" last="Bi">Zhaohui Bi</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Cardiology, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Zhao, Yunhe" sort="Zhao, Yunhe" uniqKey="Zhao Y" first="Yunhe" last="Zhao">Yunhe Zhao</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Cardiology, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">PMC</idno>
<idno type="pmid">31410547</idno>
<idno type="pmc">7087935</idno>
<idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7087935</idno>
<idno type="RBID">PMC:7087935</idno>
<idno type="doi">10.1007/s00392-020-01626-9</idno>
<date when="2020">2020</date>
<idno type="wicri:Area/Pmc/Corpus">000375</idno>
<idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000375</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Prevalence and impact of cardiovascular metabolic diseases on COVID-19 in China</title>
<author><name sortKey="Li, Bo" sort="Li, Bo" uniqKey="Li B" first="Bo" last="Li">Bo Li</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Cardiology, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Yang, Jing" sort="Yang, Jing" uniqKey="Yang J" first="Jing" last="Yang">Jing Yang</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Cardiology, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="Aff2"><institution-wrap><institution-id institution-id-type="GRID">grid.440653.0</institution-id>
<institution-id institution-id-type="ISNI">0000 0000 9588 091X</institution-id>
<institution>Binzhou Medical University,</institution>
</institution-wrap>
No. 346, Guanhai Road, Laishan District, Yantai, 264003 Shandong People’s Republic of China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Zhao, Faming" sort="Zhao, Faming" uniqKey="Zhao F" first="Faming" last="Zhao">Faming Zhao</name>
<affiliation><nlm:aff id="Aff3">Department of Infectious Diseases, No. 4 Hospital of Zibo, No. 210, Shan Quan Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Zhi, Lili" sort="Zhi, Lili" uniqKey="Zhi L" first="Lili" last="Zhi">Lili Zhi</name>
<affiliation><nlm:aff id="Aff4"><institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Allergy, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Wang, Xiqian" sort="Wang, Xiqian" uniqKey="Wang X" first="Xiqian" last="Wang">Xiqian Wang</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Cardiology, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Liu, Lin" sort="Liu, Lin" uniqKey="Liu L" first="Lin" last="Liu">Lin Liu</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Cardiology, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Bi, Zhaohui" sort="Bi, Zhaohui" uniqKey="Bi Z" first="Zhaohui" last="Bi">Zhaohui Bi</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Cardiology, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Zhao, Yunhe" sort="Zhao, Yunhe" uniqKey="Zhao Y" first="Yunhe" last="Zhao">Yunhe Zhao</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Cardiology, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</nlm:aff>
</affiliation>
</author>
</analytic>
<series><title level="j">Clinical Research in Cardiology</title>
<idno type="ISSN">1861-0684</idno>
<idno type="eISSN">1861-0692</idno>
<imprint><date when="2020">2020</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
</fileDesc>
<profileDesc><textClass></textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en"><sec><title>Background</title>
<p id="Par1">Studies have reminded that cardiovascular metabolic comorbidities made patients more susceptible to suffer 2019 novel corona virus (2019-nCoV) disease (COVID-19), and exacerbated the infection. The aim of this analysis is to determine the association of cardiovascular metabolic diseases with the development of COVID-19.</p>
</sec>
<sec><title>Methods</title>
<p id="Par2">A meta-analysis of eligible studies that summarized the prevalence of cardiovascular metabolic diseases in COVID-19 and compared the incidences of the comorbidities in ICU/severe and non-ICU/severe patients was performed. Embase and PubMed were searched for relevant studies.</p>
</sec>
<sec><title>Results</title>
<p id="Par3">A total of six studies with 1527 patients were included in this analysis. The proportions of hypertension, cardia-cerebrovascular disease and diabetes in patients with COVID-19 were 17.1%, 16.4% and 9.7%, respectively. The incidences of hypertension, cardia-cerebrovascular diseases and diabetes were about twofolds, threefolds and twofolds, respectively, higher in ICU/severe cases than in their non-ICU/severe counterparts. At least 8.0% patients with COVID-19 suffered the acute cardiac injury. The incidence of acute cardiac injury was about 13 folds higher in ICU/severe patients compared with the non-ICU/severe patients.</p>
</sec>
<sec><title>Conclusion</title>
<p id="Par4">Patients with previous cardiovascular metabolic diseases may face a greater risk of developing into the severe condition and the comorbidities can also greatly affect the prognosis of the COVID-19. On the other hand, COVID-19 can, in turn, aggravate the damage to the heart.</p>
</sec>
</div>
</front>
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</TEI>
<pmc article-type="review-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Clin Res Cardiol</journal-id>
<journal-id journal-id-type="iso-abbrev">Clin Res Cardiol</journal-id>
<journal-title-group><journal-title>Clinical Research in Cardiology</journal-title>
</journal-title-group>
<issn pub-type="ppub">1861-0684</issn>
<issn pub-type="epub">1861-0692</issn>
<publisher><publisher-name>Springer Berlin Heidelberg</publisher-name>
<publisher-loc>Berlin/Heidelberg</publisher-loc>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">31410547</article-id>
<article-id pub-id-type="pmc">7087935</article-id>
<article-id pub-id-type="publisher-id">1626</article-id>
<article-id pub-id-type="doi">10.1007/s00392-020-01626-9</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Review</subject>
</subj-group>
</article-categories>
<title-group><article-title>Prevalence and impact of cardiovascular metabolic diseases on COVID-19 in China</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" corresp="yes" equal-contrib="yes"><contrib-id contrib-id-type="orcid">http://orcid.org/0000-0002-9125-3024</contrib-id>
<name><surname>Li</surname>
<given-names>Bo</given-names>
</name>
<address><email>libosubmit@163.com</email>
</address>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author" equal-contrib="yes"><name><surname>Yang</surname>
<given-names>Jing</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
<xref ref-type="aff" rid="Aff2">2</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Zhao</surname>
<given-names>Faming</given-names>
</name>
<xref ref-type="aff" rid="Aff3">3</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Zhi</surname>
<given-names>Lili</given-names>
</name>
<xref ref-type="aff" rid="Aff4">4</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Wang</surname>
<given-names>Xiqian</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Liu</surname>
<given-names>Lin</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Bi</surname>
<given-names>Zhaohui</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author" corresp="yes"><name><surname>Zhao</surname>
<given-names>Yunhe</given-names>
</name>
<address><email>zhaoyunhe@medmail.com.cn</email>
</address>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<aff id="Aff1"><label>1</label>
<institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Cardiology, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</aff>
<aff id="Aff2"><label>2</label>
<institution-wrap><institution-id institution-id-type="GRID">grid.440653.0</institution-id>
<institution-id institution-id-type="ISNI">0000 0000 9588 091X</institution-id>
<institution>Binzhou Medical University,</institution>
</institution-wrap>
No. 346, Guanhai Road, Laishan District, Yantai, 264003 Shandong People’s Republic of China</aff>
<aff id="Aff3"><label>3</label>
Department of Infectious Diseases, No. 4 Hospital of Zibo, No. 210, Shan Quan Road, Zibo, 255000 People’s Republic of China</aff>
<aff id="Aff4"><label>4</label>
<institution-wrap><institution-id institution-id-type="GRID">grid.27255.37</institution-id>
<institution-id institution-id-type="ISNI">0000 0004 1761 1174</institution-id>
<institution>Department of Allergy, Zibo Central Hospital,</institution>
<institution>Shandong University,</institution>
</institution-wrap>
No. 10, Sonth Shanghai Road, Zibo, 255000 People’s Republic of China</aff>
</contrib-group>
<pub-date pub-type="epub"><day>11</day>
<month>3</month>
<year>2020</year>
</pub-date>
<fpage>1</fpage>
<lpage>8</lpage>
<history><date date-type="received"><day>17</day>
<month>2</month>
<year>2020</year>
</date>
<date date-type="accepted"><day>2</day>
<month>3</month>
<year>2020</year>
</date>
</history>
<permissions><copyright-statement>© Springer-Verlag GmbH Germany, part of Springer Nature 2020</copyright-statement>
<license><license-p>This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.</license-p>
</license>
</permissions>
<abstract id="Abs1"><sec><title>Background</title>
<p id="Par1">Studies have reminded that cardiovascular metabolic comorbidities made patients more susceptible to suffer 2019 novel corona virus (2019-nCoV) disease (COVID-19), and exacerbated the infection. The aim of this analysis is to determine the association of cardiovascular metabolic diseases with the development of COVID-19.</p>
</sec>
<sec><title>Methods</title>
<p id="Par2">A meta-analysis of eligible studies that summarized the prevalence of cardiovascular metabolic diseases in COVID-19 and compared the incidences of the comorbidities in ICU/severe and non-ICU/severe patients was performed. Embase and PubMed were searched for relevant studies.</p>
</sec>
<sec><title>Results</title>
<p id="Par3">A total of six studies with 1527 patients were included in this analysis. The proportions of hypertension, cardia-cerebrovascular disease and diabetes in patients with COVID-19 were 17.1%, 16.4% and 9.7%, respectively. The incidences of hypertension, cardia-cerebrovascular diseases and diabetes were about twofolds, threefolds and twofolds, respectively, higher in ICU/severe cases than in their non-ICU/severe counterparts. At least 8.0% patients with COVID-19 suffered the acute cardiac injury. The incidence of acute cardiac injury was about 13 folds higher in ICU/severe patients compared with the non-ICU/severe patients.</p>
</sec>
<sec><title>Conclusion</title>
<p id="Par4">Patients with previous cardiovascular metabolic diseases may face a greater risk of developing into the severe condition and the comorbidities can also greatly affect the prognosis of the COVID-19. On the other hand, COVID-19 can, in turn, aggravate the damage to the heart.</p>
</sec>
</abstract>
<kwd-group xml:lang="en"><title>Keywords</title>
<kwd>COVID-19</kwd>
<kwd>2019-nCoV</kwd>
<kwd>Cardiovascular metabolic diseases</kwd>
<kwd>Cardiac injury</kwd>
</kwd-group>
<funding-group><award-group><funding-source><institution>Natural Science Foundation of China</institution>
</funding-source>
<award-id>81700321</award-id>
<principal-award-recipient><name><surname>Li</surname>
<given-names>Bo</given-names>
</name>
</principal-award-recipient>
</award-group>
</funding-group>
<funding-group><award-group><funding-source><institution>Key Research and Development Plan of Shandong Province</institution>
</funding-source>
<award-id>2018GSF118140</award-id>
<principal-award-recipient><name><surname>Li</surname>
<given-names>Bo</given-names>
</name>
</principal-award-recipient>
</award-group>
</funding-group>
</article-meta>
</front>
<body><sec id="Sec1"><title>Introduction</title>
<p id="Par5">During the past two decades, the outbreak and prevalence of severe acute respiratory infections have been seen as one of the most serious hazards to global health. Both two prominent coronaviruses, 2002 SARS-CoV and 2012 MERS-CoV, have markedly affected humans, causing 8422 and 1600 infections, as well as 916 and 574 deaths, respectively [<xref ref-type="bibr" rid="CR1">1</xref>
, <xref ref-type="bibr" rid="CR2">2</xref>
].</p>
<p id="Par6">In early December 2019, a series of pneumonia cases with unknown reason emerged in Wuhan, Hubei, China. High-throughput sequencing from lower respiratory tract samples has revealed a novel coronavirus that was named 2019 novel coronavirus (2019-nCoV) and also named SARS-CoV-2 [<xref ref-type="bibr" rid="CR3">3</xref>
]. As of February 17th, 2020, 70,636 confirmed cases and 1772 death cases have been documented in China. 2019-nCoV also targets the respiratory tract and shares many similar clinical symptoms with SARS-CoV and MERS-CoV [<xref ref-type="bibr" rid="CR3">3</xref>
]. Common symptoms include fever, fatigue, and dry cough, followed always by anorexia, myalgia, dyspnea, and so on [<xref ref-type="bibr" rid="CR4">4</xref>
–<xref ref-type="bibr" rid="CR8">8</xref>
]. Lymphopenia and prolonged prothrombin time are also the most common characteristics [<xref ref-type="bibr" rid="CR4">4</xref>
–<xref ref-type="bibr" rid="CR6">6</xref>
].</p>
<p id="Par7">In addition, as cardiologists, we are also concerned about whether patients with cardiovascular disease are at greater risk for 2019-nCoV, and whether new coronavirus infections have an impact on the cardiovascular system. Previous studies have shown a relationship between cardiovascular metabolic diseases and SARS and MERS [<xref ref-type="bibr" rid="CR9">9</xref>
–<xref ref-type="bibr" rid="CR11">11</xref>
]. A systematic analysis of 637 MERS-CoV cases showed that diabetes and hypertension are prevalent in about 50% of the patients and cardiac diseases are present in 30% of the cases [<xref ref-type="bibr" rid="CR11">11</xref>
]. Diabetes was seen as an independent predictor for mortality and morbidity in patients with SARS [<xref ref-type="bibr" rid="CR9">9</xref>
]. With the spread of 2019-nCoV and increase of the cases, more and more 2019-nCoV infected individuals exhibit comorbidities such as hypertension, diabetes and cardia-cerebrovascular disease. In Chen’s study of 99 cases, 40% patients had cardia-cerebrovascular disease [<xref ref-type="bibr" rid="CR6">6</xref>
], and in Huang’s study of 41 cases, 20% patients had diabetes [<xref ref-type="bibr" rid="CR4">4</xref>
]. These cardiovascular metabolic comorbidities might render them more susceptible to poor prognosis. Given the rapid spread of 2019-nCoV, an updated meta-analysis with significantly larger sample sizes by integrating the published studies is urgently warranted. Accordingly, the present analysis will not only identify the cardiovascular epidemiological and clinical characteristics of 2019-nCoV infection with greater precision but also unravel the impact of the infection on the cardiac injury.</p>
</sec>
<sec id="Sec2"><title>Methods</title>
<p id="Par8">Preferred Reporting Items for Systematic Reviews and Meta-Analyses of individual participant data (the PRISMA-IPD) statement was followed for the conduct and reporting of this meta-analysis [<xref ref-type="bibr" rid="CR12">12</xref>
].</p>
</sec>
<sec id="Sec3"><title>Data source, search strategy, and inclusion criteria</title>
<p id="Par9">To identify all the studies illustrating the prevalence and impact of cardiovascular metabolic diseases in 2019 novel coronavirus infection in China, EMBASE and PubMed were carefully searched from December 2019 to February 2020. The following search terms or keywords were used alone or in combination: ‘novel coronavirus’, ‘influenza’, ‘pneumonia’, ‘cardiovascular disease’, ‘hypertension’, ‘diabetes’ and ‘cardiac injury’.</p>
<p id="Par10">Inclusion criteria are as follows: (1) comparative studies: randomised controlled trials RCTs or non-RCTs published in English; (2) study population: more than ten participants were included in the study; (3) study intervention: patients in the studies should be confirmed to have been infected by 2019 novel coronavirus; (4) parameters: the comorbidities of cardiovascular metabolic diseases and the outcome of cardiac injury should be given. Case reports, non-human studies, studies without adequate information, and studies written in Chinese (for the fear of data duplication) were excluded in the present meta-analysis.</p>
</sec>
<sec id="Sec4"><title>Data extraction and study quality assessment</title>
<p id="Par11">Prevalence of comorbidities including hypertension, cardiovascular and cerebrovascular diseases and diabetes (Table <xref rid="Tab1" ref-type="table">1</xref>
and Fig. <xref rid="Fig2" ref-type="fig">2</xref>
) together with clinical outcome of cardiac injury (confirmed by elevation of Troponin I/T, or the creatine kinase seen as the second choice if Troponin I/T were not provided) were extracted from the identified studies (Table <xref rid="Tab1" ref-type="table">1</xref>
and Fig. <xref rid="Fig3" ref-type="fig">3</xref>
). The primary outcome measure was to compare the prevalence of comorbidities and impact on cardiac injury in ICU and Non-ICU cases (severe and non-severe data as the second choice if ICU data was not provided). Cochrane Collaboration’s tool was followed to assess the risk of bias.<table-wrap id="Tab1"><label>Table 1</label>
<caption><p>Number, age, sex and cardiovascular metabolic diseases of patients of the 6 included studies</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="2">References</th>
<th align="left" rowspan="2">Date</th>
<th align="left" rowspan="2">Number of patients</th>
<th align="left" rowspan="2">Hospital</th>
<th align="left" rowspan="2">Age</th>
<th align="left" rowspan="2">Sex (male, %)</th>
<th align="left" colspan="4">Cardiovascular metabolic diseases</th>
</tr>
<tr><th align="left">Hypertension (%)</th>
<th align="left">Diabetes (%)</th>
<th align="left">Cardia-cerebrovascular disease (%)</th>
<th align="left">Cardiac injury (%)</th>
</tr>
</thead>
<tbody><tr><td align="left">Wang et al. [<xref ref-type="bibr" rid="CR5">5</xref>
]</td>
<td align="left">2020.01.01–2020.01.28</td>
<td align="left">138</td>
<td align="left">Zhongnan Hospital</td>
<td align="left">56 (42–68)</td>
<td align="left">54.3</td>
<td align="left">31.2</td>
<td align="left">10.1</td>
<td align="left">19.6</td>
<td align="left">7.2</td>
</tr>
<tr><td align="left">Huang et al. [<xref ref-type="bibr" rid="CR4">4</xref>
]</td>
<td align="left">2019.12.16–2020.01.02</td>
<td align="left">41</td>
<td align="left">Jinyintan Hospital</td>
<td align="left">49 (41–58)</td>
<td align="left">73</td>
<td align="left">15</td>
<td align="left">20</td>
<td align="left">15</td>
<td align="left">12</td>
</tr>
<tr><td align="left">Guan et al. [<xref ref-type="bibr" rid="CR8">8</xref>
]</td>
<td align="left">As of 2020.01.29</td>
<td align="left">1099</td>
<td align="left">552 hospitals in China</td>
<td align="left">47 (35–58)</td>
<td align="left">59.2</td>
<td align="left">14.9</td>
<td align="left">7.4</td>
<td align="left">3.9</td>
<td align="left">13.7*</td>
</tr>
<tr><td align="left">Chen et al. [<xref ref-type="bibr" rid="CR6">6</xref>
]</td>
<td align="left">2020.01.01–2020.01.28</td>
<td align="left">99</td>
<td align="left">Jinyintan Hospital</td>
<td align="left">55.5 (21–82)</td>
<td align="left">68</td>
<td align="left">–</td>
<td align="left">12</td>
<td align="left">40</td>
<td align="left">13*</td>
</tr>
<tr><td align="left">Chang et al. [<xref ref-type="bibr" rid="CR16">16</xref>
]</td>
<td align="left">2020.01.16–2020.02.04</td>
<td align="left">11</td>
<td align="left">3 hospitals in Beijing</td>
<td align="left">34 (34–48)</td>
<td align="left">77</td>
<td align="left">–</td>
<td align="left">–</td>
<td align="left">–</td>
<td align="left">–</td>
</tr>
<tr><td align="left">Liu et al. [<xref ref-type="bibr" rid="CR17">17</xref>
]</td>
<td align="left">2019.12.30–2020.01.24</td>
<td align="left">137</td>
<td align="left">9 tertiary hospitals in Hubei</td>
<td align="left">57 (20–83)</td>
<td align="left">44.5</td>
<td align="left">9.5</td>
<td align="left">10.2</td>
<td align="left">7.3</td>
<td align="left">–</td>
</tr>
</tbody>
</table>
<table-wrap-foot><p>In the two studies, 13(13%) and 90 (13.7) patients were reported as elevation of creatine kinase, but they were not confirmed as cardiac injury</p>
</table-wrap-foot>
</table-wrap>
</p>
</sec>
<sec id="Sec5"><title>Data synthesis and statistical analysis</title>
<p id="Par12">All analyses were performed using OpenMeta Analyst version 10.10 (<ext-link ext-link-type="uri" xlink:href="https://www.cebm.brown.edu/open_meta">https://www.cebm.brown.edu/open_meta</ext-link>
) and RevMan software version 5.3. Forest plots were used to illustrate the prevalence of the cardiovascular metabolic diseases in 2019-nCov infection severity from the selected studies as well as the impact of the 2019-nCov infection on the cardiac injury. The results of the included studies were performed with fixed-effect models (Mantel–Haenszel method) [<xref ref-type="bibr" rid="CR13">13</xref>
] or random-effect models in cases of significant heterogeneity between estimates [<xref ref-type="bibr" rid="CR14">14</xref>
]. We used the I<sup>2</sup>
statistics to assess the magnitude of heterogeneity: 25%, 50%, and 75% represented low, moderate, and high degrees of heterogeneity, respectively. The chosen of the proper effect model was based on the analysis results: the fixed effect model was used if <italic>I</italic>
<sup>2</sup>
< 50% and the random effect model was used if <italic>I</italic>
<sup>2</sup>
≥ 50% [<xref ref-type="bibr" rid="CR15">15</xref>
].</p>
</sec>
<sec id="Sec6"><title>Results</title>
<sec id="Sec7"><title>Selected studies and baseline characteristics</title>
<p id="Par13">After initially identifying 399 articles, 111 duplicate documents were identified. Of the leaving trials, after review of the titles and abstracts, 277 documents of non-human researches, reviews and studies that were not clinical trials were excluded. The leaving 11 studies were carefully and detailed evaluated. At last, six studies were excluded, because the participants of the trials did not meet the criteria we have set. Then one study published in MedRxiv was added. Finally, a total of six studies with 1527 patients were included [<xref ref-type="bibr" rid="CR4">4</xref>
–<xref ref-type="bibr" rid="CR6">6</xref>
, <xref ref-type="bibr" rid="CR8">8</xref>
, <xref ref-type="bibr" rid="CR16">16</xref>
, <xref ref-type="bibr" rid="CR17">17</xref>
] (Fig. <xref rid="Fig1" ref-type="fig">1</xref>
). All of the selected studies were published in 2020 with different sample patient sizes that ranged from 11 to 1099 patients (Table <xref rid="Tab1" ref-type="table">1</xref>
summarizes the study characteristics).<fig id="Fig1"><label>Fig. 1</label>
<caption><p>Flow diagram of the study selection process</p>
</caption>
<graphic xlink:href="392_2020_1626_Fig1_HTML" id="MO3"></graphic>
</fig>
</p>
</sec>
</sec>
<sec id="Sec8"><title>Primary outcomes</title>
<p id="Par14">Systematic analysis of studies that described the epidemiological and clinical features of COVID-19 cases and reported the prevalence of cardiovascular metabolic diseases as well as the impact on cardiac injury in the infectious disease, has identified six reports with 1527 patients (Table <xref rid="Tab1" ref-type="table">1</xref>
). The majority of the cases were localized in Wuhan, or recent travel to Wuhan, or contact people from Wuhan. The median ages were, respectively, 56, 49, 47, 55.5, 34 and 57 years old according to the six studies. The infection was diagnosed throughout the whole spectrum of age covering from new born to 92 years old. In all of the studies, men were more likely to be infected than women and the overall proportion of male is 57.8%.</p>
<p id="Par15">Meta-analysis for the identified studies showed that the most prevalent cardiovascular metabolic comorbidities were hypertension (17.1%, 95% CI 9.9–24.4%) and cardia-cerebrovascular disease (16.4%, 95% CI 6.6–26.1%), followed by diabetes (9.7%, 95% CI 6.9–12.5%) (Fig. <xref rid="Fig2" ref-type="fig">2</xref>
). There was a significant heterogeneity (Cochran’s <italic>Q</italic>
) in the estimates of comorbidities among the identified studies with an <italic>I</italic>
<sup>2</sup>
index varied from 47 to 95% (Fig. <xref rid="Fig2" ref-type="fig">2</xref>
).<fig id="Fig2"><label>Fig. 2</label>
<caption><p>Meta-analysis for the proportion of hypertension, cardia-cerebrovascular disease and diabetes in COVID-19 cases. Weights are calculated from binary random-effects model analysis. Values represent proportions of the 3 diseases in the COVID-19 patients and 95% CI. Heterogeneity analysis was carried out using <italic>Q</italic>
test, the among studies variation (<italic>I</italic>
<sup>2</sup>
index). Forest plots depict the comparison of the incidences of the 3 diseases in ICU/severe and non-ICU/severe patients</p>
</caption>
<graphic xlink:href="392_2020_1626_Fig2_HTML" id="MO1"></graphic>
</fig>
</p>
<p id="Par16">We then compared the difference of the prevalence of the three diseases between severe patients and non-severe patients (or ICU patients vs non-ICU patients according to the data in the studies). For hypertension and cardia-cerebrovascular disease, the heterogeneity test results were calculated as <italic>I</italic>
<sup>2</sup>
= 47% and 26%. Thus, the fixed-effect model was used for further analyses. The results from the three included studies (with a total amount of 1278 patients) showed that hypertension accounted for 28.8% of ICU/severe cases, but 14.1% of non-ICU/severe cases. A similar pattern was found in cardia-cerebrovascular disease statistics: it accounted for 16.7% of ICU/severe cases, but 6.2% of non-ICU/severe cases. The proportion hypertension and cardia-cerebrovascular disease were both statistically significant higher in ICU/severe patients compared to the non-ICU/severe patients [hypertension: RR = 2.03, 95% CI (1.54, 2.68), <italic>Z</italic>
= 5.04, <italic>P</italic>
< 0.00001; cardia-cerebrovascular disease: RR = 3.30, 95% CI (2.03, 5.36), <italic>Z</italic>
= 4.81, <italic>P</italic>
< 0.00001] (Fig. <xref rid="Fig2" ref-type="fig">2</xref>
). For diabetes, the heterogeneity test showed that <italic>I</italic>
<sup>2</sup>
= 67%, and so the random effect model was used. Diabetes accounted for 11.7% of ICU/severe cases, but 4.0% of non-ICU/severe cases. The result indicated a higher proportion of diabetes in ICU/severe patients but without statistical significance [RR = 2.21, 95% CI (0.88, 5.57), <italic>Z</italic>
= 1.68, <italic>P</italic>
= 0.09] (Fig. <xref rid="Fig2" ref-type="fig">2</xref>
).</p>
<p id="Par17">At last, we focused on the impact of the COVID-19 on the cardiac injury. Two studies that gave clear data were statistically analyzed, and the data showed that 8.0% (95% CI 4.1–12.0%) patients might be suffered from an acute cardiac injury. Another two studies only gave the data of creatine kinase, if it can be seen as a biomarker of cardiac injury, the proportion might be 11.5% (95% CI 7.8–15.2%). When we attempted to compare the differences of cardiac injury incidences between ICU/severe patients and non-ICU/severe patients, we just included the two studies which specifically identified myocardial injury. The data again showed a significant higher incidence of acute cardiac injury in ICU/severe patients compared to the non-ICU/severe patients [RR = 13.48, 95% CI (3.60, 50.47), <italic>Z</italic>
= 3.86, <italic>P</italic>
= 0.0001] (Fig. <xref rid="Fig3" ref-type="fig">3</xref>
). The funnel plots demonstrated symmetrical distributions of the effect size of hypertension, cardia-cerebrovascular diseases and cardiac injury on either side of the pooled estimate, but a non-symmetrical distribution of the effect size of diabetes (Fig. <xref rid="Fig4" ref-type="fig">4</xref>
). <fig id="Fig3"><label>Fig. 3</label>
<caption><p>Meta-analysis for the incidence of cardiac injury in COVID-19 cases. Weights are calculated from binary random-effects model analysis. Values represent proportions of the cardiac injury in the COVID-19 patients and 95% CI. Heterogeneity analysis was carried out using <italic>Q</italic>
test, the among studies variation (<italic>I</italic>
<sup>2</sup>
index). Forest plots depict the comparison of the incidences of cardiac injury in ICU/severe and non-ICU/severe patients</p>
</caption>
<graphic xlink:href="392_2020_1626_Fig3_HTML" id="MO2"></graphic>
</fig>
<fig id="Fig4"><label>Fig. 4</label>
<caption><p>Funnel plots of the comparisons of hypertension, cardia-cerebrovascular disease, diabetes and acute cardiac injury between ICU/severe and non-ICU/severe patients</p>
</caption>
<graphic xlink:href="392_2020_1626_Fig4_HTML" id="MO4"></graphic>
</fig>
</p>
</sec>
<sec id="Sec9"><title>Discussion</title>
<p id="Par18">Coronaviruses are enveloped RNA viruses, which include six species that can cause diseases in humans to our knowledge [<xref ref-type="bibr" rid="CR18">18</xref>
]. Four viruses among them (229E, OC43, NL63, and HKU1) have been reported to cause common cold symptoms in immunocompetent individuals [<xref ref-type="bibr" rid="CR18">18</xref>
]. However, the two other strains are the infamous SARS-CoV and MERS-CoV, which have been linked to fatal illness and caused plagues and large numbers of deaths [<xref ref-type="bibr" rid="CR19">19</xref>
]. Complete genome sequences of 2019-nCoV showed that it is identified as a novel betacoronavirus belonging to the sarbecovirus subgenus of Coronaviridae family, the same subgenus with SARS-CoV [<xref ref-type="bibr" rid="CR3">3</xref>
].</p>
<p id="Par19">According to previous research on SARS-CoV, the presence of comorbidities increased the mortality risk, with cardiac disease and diabetes being the most important components to predict adverse outcomes [<xref ref-type="bibr" rid="CR20">20</xref>
]. Cardiac disease and diabetes increase the risk of death by twice as much as other risk factors [<xref ref-type="bibr" rid="CR20">20</xref>
]. Thus, it is necessary for us to evaluate the prevalence of cardiac and metabolic diseases in COVID-19. The present systematic analysis summarized the data from all of the five studies of COVID-19. The results demonstrated that the overall proportion of hypertension, cardia-cerebrovascular disease and diabetes were, respectively, 17.1%, 16.4% and 9.7%. According to Summary of the 2018 report on cardiovascular diseases in China, the morbidities of the hypertension and diabetes were, respectively, 23.2% and 10.9%, and there were about 13 million of cerebrovascular disease patients and 11 million of cardiovascular patients [<xref ref-type="bibr" rid="CR21">21</xref>
]. Therefore, comparing the data to the report, we did not find that people with hypertension and diabetes were more susceptible to 2019-nCoV infection. The prevalence of hypertension and diabetes in people infected with the virus is about the same as in the general population, even slightly lower. However, comparing the general population, the incidence of cardia-cerebrovascular disease in patients with COVID-19 is obviously much higher.</p>
<p id="Par20">Due to the sample size and limited time so far, data collection is still incomplete, and most of the studies have not analyzed comorbidities in death cases. So the relationship between cardiovascular metabolic diseases and COVID-19-induced death cannot be determined. But what is assuredly is that patients with hypertension, cardia-cerebrovascular diseases or diabetes are more likely to develop severe/ICU cases after 2019-nCoV infection. The overall proportion of hypertension, cardia-cerebrovascular diseases and diabetes were about twofolds, threefolds and twofolds, respectively, higher in ICU/severe cases than in their non-ICU/severe counterparts. Although the difference of diseases in the meta-analysis is not statistical, the RR value is about 2.21, and we consider this might because of the sample size of included studies and the algorithm adopts the random effect model which is a more conservative approach. So we speculate the result might reach statistical significance when more researches publish their data.</p>
<p id="Par21">Another important finding is the damage the virus did to the heart. According to the present summary, at least 8.0% patients with COVID-19 suffered acute cardiac injury. In Chen’s report, the first death was a 61-year old man with no previous chronic underlying disease. After he was admitted by ICU, he had developed severe respiratory failure, heart failure, and sepsis, and then experienced a sudden cardiac arrest on the 11th day of admission and was declared dead [<xref ref-type="bibr" rid="CR6">6</xref>
]. This case reminded us that patients with a novel coronavirus might develop acute cardiac injury. And further analysis indicates us that the incidence of myocardial injury is much higher in ICU/severe patients, about 13 folds more than non-ICU/cardiac patients. And furthermore, the observation also reminded us that patients with COVID-19 associated with unstable angina or STEMI have poor cardiac reserve, lower tolerance to severe pneumonia, and are more likely to develop cardiac insufficiency, leading to deterioration. According to the information released by Shanghai health commission, the first COVID-19 death in Shanghai was a patient 88 years old, with a serious history of hypertension, cardiac dysfunction. The analysis of death causes suggested that the patient died of heart failure and systemic multiple organ dysfunction, and in the course of its onset, the 2019 nCoV infection is only the inducement.</p>
<p id="Par22">The pathogenesis of 2019 nCoV infection-related acute myocardial injury is still unknown. But according to the clinical presentation and lab data of the disease, as well as the pathogenesis of SARS-CoV, It can be speculated that 2019-ncov infection may affect the cardiovascular system through multiple mechanisms.</p>
<p id="Par23">First, viral infection directly causes damage to cardiomyocyte. According to Oudit’s study, SARS-CoV viral RNA was detected in 35% of autopsied human heart samples from SARS-CoV infected patients during the Toronto SARS outbreak [<xref ref-type="bibr" rid="CR22">22</xref>
]. And they also confirmed that pulmonary infection with the human SARS-CoV in mice led to an ACE2-dependent myocardial infection [<xref ref-type="bibr" rid="CR22">22</xref>
]. ACE2 is an important target for SARS-CoV [<xref ref-type="bibr" rid="CR23">23</xref>
], and molecular modelling has shown high structural similarity between the receptor-binding domains of SARS-CoV and 2019-nCoV [<xref ref-type="bibr" rid="CR24">24</xref>
]. ACE2 expression is highly tissue-specific, mainly expressed in the cardiovascular, renal and gastrointestinal systems, with a small amount expressed in lung cells. Therefore, in addition to coronaviruses causing pneumonia through ACE2 receptors in lung epithelial cells, we also need to pay attention to possible viral effects on myocardial tissue. Second, hypoxaemia may be also an important reason of cardiac injury. In Huang’s study, 32% COVID-19 patients had various degree of hypoxaemia and need required high-flow nasal cannula or higher-level oxygen support. In Chen’s study, up to 76% of patients require oxygen therapy. Due to severe 2019-nCoV infection, the pneumonia may cause significant gas exchange obstruction, leading to hypoxaemia, which significantly reduces the energy supply by cell metabolism, and increases anaerobic fermentation, causing intracellular acidosis and oxygen free radicals to destroy the phospholipid layer of cell membrane. Meanwhile, hypoxia-induced influx of calcium ions also leads to injury and apoptosis of cardiomyocytes. Third, Huang’s study noted that high concentration of IL-1β, IFN-γ, IP-10 and MCP-1 could be detected in patients infected with 2019-nCoV, which might lead to activated T-helper-1 (Th1) cell responses [<xref ref-type="bibr" rid="CR4">4</xref>
]. Furthermore, they also found that ICU patients had much higher concentrations of inflammatory factors than those non-ICU patients, suggesting that the cytokine storm was associated with disease severity [<xref ref-type="bibr" rid="CR4">4</xref>
]. In addition, repeated floods of catecholamines due to anxiety and the side effects of medication can also lead to myocardial damage.</p>
<p id="Par24">In conclusion, patients with previous cardiovascular metabolic diseases may face a greater risk of infection of 2019-nCoV and it can also greatly affect the development and prognosis of pneumonia. Simultaneously, we should pay close attention to viral infection-related heart damage in the course of disease treatment.</p>
</sec>
</body>
<back><fn-group><fn><p>Bo Li and Jing Yang contributed equally to this article.</p>
</fn>
</fn-group>
<notes notes-type="funding-information"><title>Funding</title>
<p>This study was supported by the Natural Science Foundation of China (no. 81700321), the Key Research and Development Plan of Shandong Province (2018GSF118140).</p>
</notes>
<notes notes-type="ethics"><title>Compliance with ethical standards</title>
<notes notes-type="COI-statement"><title>Conflict of interest</title>
<p id="Par25">None declared.</p>
</notes>
</notes>
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