{"id":7608,"date":"2017-09-25T00:00:00","date_gmt":"2017-09-25T04:00:00","guid":{"rendered":"https:\/\/icesontario.wpengine.com\/news-releases\/h1n1-infection-increased-risk-of-premature-births-for-pregnant-women-with-pre-existing-medical-conditions\/"},"modified":"2023-06-14T18:18:06","modified_gmt":"2023-06-14T22:18:06","slug":"h1n1-infection-increased-risk-of-premature-births-for-pregnant-women-with-pre-existing-medical-conditions","status":"publish","type":"news_release","link":"https:\/\/www.ices.on.ca\/fr\/news-releases\/h1n1-infection-increased-risk-of-premature-births-for-pregnant-women-with-pre-existing-medical-conditions\/","title":{"rendered":"H1N1 infection increased risk of premature births for pregnant women with pre-existing medical conditions"},"content":{"rendered":"<p>Pregnant women with certain medical conditions, such as asthma or heart disease, were at an increased risk of giving birth too early if they were infected with influenza during the H1N1 pandemic, according to a new study by researchers at the <span class=\"bold\">Institute for Clinical Evaluative Sciences (ICES)<\/span> and Children&#x2019;s Hospital of Eastern Ontario (CHEO) Research Institute. <\/p>\n<div>\n<div class=\"download-section alignwide infographic-download\" id=\"block_36bdeace577d03bb63b3911e03dc14b1\" data-style=\"deep-blue\">\n\t<div class=\"download-section-content\">\n\t\t\t\t<h2>\n\t\t\tInfographic\t\t<\/h2>\n\t\t\n\t\t\t<\/div>\n\t<div class=\"download-section-buttons\">\n\t\t\t\t\t\t<a class=\"download-section-buttons-primary\" href=\"https:\/\/www.ices.on.ca\/wp-content\/uploads\/2023\/03\/FellH1N1PregnancyFIN.jpg\" target=\"_blank\"\n\t\t\tdownload\t\t\taria-label=\"Download Infographic (opens in a new tab)\"\t\t>\n\t\t\tDownload Infographic\t\t\t<svg width=\"19\" height=\"19\" viewBox=\"0 0 19 19\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"presentation\">\n<path d=\"M2.78003 18.8301C2.14282 18.8301 1.59713 18.603 1.14297 18.1488C0.688813 17.6947 0.46212 17.1494 0.462893 16.5129V13.0372H2.78003V16.5129H16.6829V13.0372H19V16.5129C19 17.1502 18.7729 17.6958 18.3188 18.15C17.8646 18.6042 17.3193 18.8308 16.6829 18.8301H2.78003ZM9.73145 14.1958L3.9386 8.40295L5.5606 6.72303L8.57288 9.73531V0.292969H10.89V9.73531L13.9023 6.72303L15.5243 8.40295L9.73145 14.1958Z\" fill=\"#151D5D\"\/>\n<\/svg>\n\t\t<\/a>\n\t\t\n\t\t\t\t\t\t<a class=\"download-section-buttons-secondary\" href=\"https:\/\/www.ices.on.ca\/wp-content\/uploads\/2023\/03\/FellH1N1PregnancyFIN.jpg\" target=\"_blank\" aria-label=\"Click to View (opens in a new tab)\">\n\t\t\tClick to View\t\t<\/a>\n\t\t\t<\/div>\n<\/div>\n<\/div>\n<p>In particular, when H1N1 was diagnosed in the third trimester of pregnancy, these high-risk pregnant women were three times more likely to have a preterm birth, compared with high-risk pregnant women who did not contract the virus. The study considered women at high risk if they had conditions known to increase the severity of influenza and related complications such as asthma, diabetes, chronic hypertension and heart disease. <\/p>\n<p>The study found the rate of preterm birth in the Ontario population was 6.2 per cent; in the subgroup of women with high-risk conditions, the risk of preterm birth was 9.6 per cent.<\/p>\n<p>However, among healthy pregnant women the study found no link between H1N1 influenza infection and preterm birth. <\/p>\n<p>&#x201c;Many people were concerned about the health of pregnant women during the 2009 H1N1 pandemic, so it is very reassuring that H1N1 influenza illness was not a major contributor to preterm birth in Ontario&#x2019;s general obstetrical population,&#x201d; says <a>Dr. Deshayne Fell<\/a>, lead author of the study, adjunct scientist at ICES, scientist at the CHEO Research Institute. <\/p>\n<p>&#x201c;However, going forward, the study suggests that high-risk pregnant women should be considered when developing prevention and treatment plans for seasonal influenza and future influenza pandemics,&#x201d; adds Dr. Fell, who is also an assistant professor at the University of Ottawa&#x2019;s School of Epidemiology, Public Health and Preventative Medicine.<\/p>\n<p>The analysis looked at all 192,082 single births &#xa0;in the Better Outcomes Registry &amp; Network (BORN) Ontario &#x2014; a provincial registry containing all hospital births greater than 500 grams or 20 weeks of gestation &#x2014; that were possibly affected by the 2009 H1N1 pandemic by linking the registry with administrative health data. It found that 2,925 pregnant women were diagnosed with pandemic H1N1. <\/p>\n<p>&#x201c;Our study looked specifically at preterm birth but there may be other complications that can occur when a pregnant woman is exposed to H1N1. Importantly, other studies have shown that vaccinating pregnant women protects the infants from influenza in the early months after they are born, so we always suggest pregnant women get vaccinated,&#x201d; says study co-author<a href=\"\/ices-scientists\/jeff-kwong\/\"> Dr. Jeff Kwong<\/a>, who is a scientist at ICES and family physician. <\/p>\n<p>The H1N1 pandemic lasted from 2009 to 2010 and was deemed a public health emergency in many countries, including Canada. The most recent estimations suggest that there were between 151,700 and 575,400 deaths worldwide. Since 2009, H1N1 has circulated globally at lower levels. <\/p>\n<p>&#x201c;The relationship between 2009 pandemic H1N1 influenza during pregnancy and preterm birth: a population-based cohort study,&#x201d; was published today in the journal <em>Epidemiology.<\/em><\/p>\n<p><em>Author block: Fell DB, Platt RW, Basso O, Wilson K, Kaufman JS, Buckeridge DL, Kwong JC<\/em><\/p>\n<p><em><span style=\"color: #002060;\"><span class=\"bold\">The Institute for Clinical Evaluative Sciences (ICES)<\/span> is an independent, non-profit organization that uses population-based health information to produce knowledge on a broad range of healthcare issues. Our unbiased evidence provides measures of health system performance, a clearer understanding of the shifting healthcare needs of Ontarians, and a stimulus for discussion of practical solutions to optimize scarce resources. ICES knowledge is highly regarded in Canada and abroad, and is widely used by government, hospitals, planners, and practitioners to make decisions about care delivery and to develop policy. For the latest ICES news, follow us on Twitter: <a href=\"http:\/\/www.twitter.com\/ICESOntario\">@ICESOntario<\/a><\/span><\/em><\/p>\n<h2>FOR FURTHER INFORMATION PLEASE CONTACT:<\/h2>\n<p>\nDeborah Creatura<br \/>\nMedia Advisor, ICES<br \/>\n<a href=\"mailto:deborah.creatura@ices.on.ca\">deborah.creatura@ices.on.ca<\/a><br \/>\n(o) 416-480-4780 or (c) 647-406-5996<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pregnant women with certain medical conditions, such as asthma or heart disease, were at an increased risk of giving birth too early if they were infected with influenza during the H1N1 pandemic, according to a new study by researchers at the Institute for Clinical Evaluative Sciences (ICES) and Children&#x2019;s Hospital of Eastern Ontario (CHEO) Research [&hellip;]<\/p>\n","protected":false},"template":"","migration-helper-automated":[90],"migration-manual":[],"topic":[40,39,26,21],"class_list":["post-7608","news_release","type-news_release","status-publish","hentry","migration-helper-automated-transform-in-content-links-errors","topic-cardiovascular-disease","topic-infectious-diseases","topic-maternity-and-neonatal-care","topic-women-or-gender-based-research"],"acf":{"infographic":[9435],"journal_article":[3531],"research_report":[],"atlas":[],"research_program":[],"site":[6733,6734],"ices_scientist":[1149],"announce_or_event":[],"video":[],"iitn_type":false,"iitn_title":"","iitn_short_title":"","iitn_source_link_url":"","iitn_source_link_text":"","sitecore_item_id":"D4E1CEF8-0D93-46AB-9E5A-AAF3D4885E5F","sitecore_item_name":"H1N1-infection-increased-risk-of-premature-births-for-pregnant-women","sitecore_field_values":"{\n  \"Content\": \"<p>Pregnant women with certain medical conditions, such as asthma or heart disease, were at an increased risk of giving birth too early if they were infected with influenza during the H1N1 pandemic, according to a new study by researchers at the <span class=\"bold\">Institute for Clinical Evaluative Sciences (ICES)<\/span> and Children&rsquo;s Hospital of Eastern Ontario (CHEO) Research Institute. <\/p>n<p><a href=\"~\/media\/9A95C6B7D1BF47D9AF9FBDC598EE5162.ashx\" onclick=\"_gaq.push(['_trackEvent','Download', 'FellH1N1InfographicSept2017',this.href]);\"><img height=\"203\" alt=\"H1N1 linked to risk of preterm birth among women with chronic health issues\" width=\"350\" src=\"~\/media\/E35E94C1A5AF46B8B0B60D2568DF2910.ashx\" \/><\/a><span class=\"grey\" style=\"font-size: 12px; font-weight: bold; display: block; color: #5b5656;\">Click image to enlarge<\/span><\/p>n<p>In particular, when H1N1 was diagnosed in the third trimester of pregnancy, these high-risk pregnant women were three times more likely to have a preterm birth, compared with high-risk pregnant women who did not contract the virus. The study considered women at high risk if they had conditions known to increase the severity of influenza and related complications such as asthma, diabetes, chronic hypertension and heart disease. <\/p>n<p>The study found the rate of preterm birth in the Ontario population was 6.2 per cent; in the subgroup of women with high-risk conditions, the risk of preterm birth was 9.6 per cent.<\/p>n<p>However, among healthy pregnant women the study found no link between H1N1 influenza infection and preterm birth. <\/p>n<p>&ldquo;Many people were concerned about the health of pregnant women during the 2009 H1N1 pandemic, so it is very reassuring that H1N1 influenza illness was not a major contributor to preterm birth in Ontario&rsquo;s general obstetrical population,&rdquo; says <a href=\"~\/link.aspx?_id=552D67BE01C64A409B3D970515E77F9B&amp;_z=z\">Dr. Deshayne Fell<\/a>, lead author of the study, adjunct scientist at ICES, scientist at the CHEO Research Institute. <\/p>n<p>&ldquo;However, going forward, the study suggests that high-risk pregnant women should be considered when developing prevention and treatment plans for seasonal influenza and future influenza pandemics,&rdquo; adds Dr. Fell, who is also an assistant professor at the University of Ottawa&rsquo;s School of Epidemiology, Public Health and Preventative Medicine.<\/p>n<p>The analysis looked at all 192,082 single births &nbsp;in the Better Outcomes Registry &amp; Network (BORN) Ontario &mdash; a provincial registry containing all hospital births greater than 500 grams or 20 weeks of gestation &mdash; that were possibly affected by the 2009 H1N1 pandemic by linking the registry with administrative health data. It found that 2,925 pregnant women were diagnosed with pandemic H1N1. <\/p>n<p>&ldquo;Our study looked specifically at preterm birth but there may be other complications that can occur when a pregnant woman is exposed to H1N1. Importantly, other studies have shown that vaccinating pregnant women protects the infants from influenza in the early months after they are born, so we always suggest pregnant women get vaccinated,&rdquo; says study co-author<a href=\"~\/link.aspx?_id=1448928087E24E37BCF535BDF557014F&amp;_z=z\"> Dr. Jeff Kwong<\/a>, who is a scientist at ICES and family physician. <\/p>n<p>The H1N1 pandemic lasted from 2009 to 2010 and was deemed a public health emergency in many countries, including Canada. The most recent estimations suggest that there were between 151,700 and 575,400 deaths worldwide. Since 2009, H1N1 has circulated globally at lower levels. <\/p>n<p>&ldquo;The relationship between 2009 pandemic H1N1 influenza during pregnancy and preterm birth: a population-based cohort study,&rdquo; was published today in the journal <em>Epidemiology.<\/em><\/p>n<p><em>Author block: Fell DB, Platt RW, Basso O, Wilson K, Kaufman JS, Buckeridge DL, Kwong JC<\/em><\/p>n<p><em><span style=\"color: #002060;\"><span class=\"bold\">The Institute for Clinical Evaluative Sciences (ICES)<\/span> is an independent, non-profit organization that uses population-based health information to produce knowledge on a broad range of healthcare issues. Our unbiased evidence provides measures of health system performance, a clearer understanding of the shifting healthcare needs of Ontarians, and a stimulus for discussion of practical solutions to optimize scarce resources. ICES knowledge is highly regarded in Canada and abroad, and is widely used by government, hospitals, planners, and practitioners to make decisions about care delivery and to develop policy. For the latest ICES news, follow us on Twitter: <a href=\"http:\/\/www.twitter.com\/ICESOntario\">@ICESOntario<\/a><\/span><\/em><\/p>n<h2>FOR FURTHER INFORMATION PLEASE CONTACT:<\/h2>n<p>nDeborah Creatura<br \/>nMedia Advisor, ICES<br \/>n<a href=\"mailto:deborah.creatura@ices.on.ca\">deborah.creatura@ices.on.ca<\/a><br \/>n(o) 416-480-4780 or (c) 647-406-5996<\/p>\",\n  \"Title\": \"H1N1 infection increased risk of premature births for pregnant women with pre-existing medical conditions \",\n  \"Short title\": \"H1N1 infection increased risk\",\n  \"Teaser image\": \"<image mediaid=\"{A322F4BD-074D-4BD9-A21A-A9A358DE2CFF}\" \/>\",\n  \"Summary\": \"Pregnant women with certain medical conditions, such as asthma or heart disease, were at an increased risk of giving birth too early if they were infected with influenza during the H1N1 pandemic.\",\n  \"Location\": \"Toronto\",\n  \"ICES Scientists\": \"{552D67BE-01C6-4A40-9B3D-970515E77F9B}|{14489280-87E2-4E37-BCF5-35BDF557014F}\",\n  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