Blar i forfatter "Varmdal, Torunn"

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    • Data from national health registers as endpoints for the Tromsø Study: Correctness and completeness of stroke diagnoses 

      Varmdal, Torunn; Løchen, Maja-Lisa; Wilsgaard, Tom; Njølstad, Inger; Nyrnes, Audhild; Grimsgaard, Sameline; Mathiesen, Ellisiv B. (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-14)
      Aim: To assess whether stroke diagnoses in national health registers are sufficiently correct and complete to replace manual collection of endpoint data for the Tromsø Study, a population-based epidemiological study.<p> <p>Method: Using the Tromsø Study Cardiovascular Disease Register for 2013–2014 as the gold standard, we calculated correctness (defined as positive predictive value, PPV) and ...

    • Influenza vaccination and risk for cardiovascular events: a nationwide self-controlled case series study 

      Sen, Abhijit; Bakken, Inger Johanne Landsjøåsen; Govatsmark, Ragna Elise Støre; Varmdal, Torunn; Bønaa, Kaare Harald; Mukamal, Kenneth Jay; Håberg, Siri Eldevik; Janszky, Imre (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-13)
      <i>Background</i> - US and European guidelines diverge on whether to vaccinate adults who are not at high risk for cardiovascular events against influenza. Here, we investigated the associations between influenza vaccination and risk for acute myocardial infarction, stroke and pulmonary embolism during the 2009 pandemic in Norway, when vaccination was recommended to all adults.<br><br> <i>Methods</i> ...

    • Inter-rater reliability of a national acute stroke register 

      Varmdal, Torunn; Ellekjær, Hanne; Fjærtoft, Hild; Indredavik, Bent; Lydersen, Stian; Bønaa, Kaare Harald (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-10-19)
      <p>Background: Medical quality registers are useful sources of knowledge about diseases and the health services. However, there are challenges in obtaining valid and reliable data. This study aims to assess the reliability in a national medical quality register. <p>Methods: We randomly selected 111 patients having had a stroke in 2012. An experienced stroke nurse completed the Norwegian Stroke ...

    • Validating Acute Myocardial Infarction Diagnoses in National Health Registers for Use as Endpoint in Research: The Tromsø Study 

      Varmdal, Torunn; Mathiesen, Ellisiv B.; Wilsgaard, Tom; Njølstad, Inger; Nyrnes, Audhild; Grimsgaard, Sameline; Bønaa, Kaare Harald; Mannsverk, Jan; Løchen, Maja-Lisa (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-08-03)
      <i>Purpose</i>: To assess whether acute myocardial infarction (MI) diagnoses in national health registers are sufficiently correct and complete to replace manual collection of endpoint data for a population-based, epidemiological study.<br><br> <i>Patients and Methods</i>: Using the Tromsø Study Cardiovascular Disease Register for 2013– 2014 as gold standard, we calculated correctness (defined ...

    • Wake-up stroke and unknown-onset stroke; occurrence and characteristics from the nationwide Norwegian Stroke Register 

      Søyland, Mary-Helen; Tveiten, Arnstein; Eltoft, Agnethe; Øygarden, Halvor; Varmdal, Torunn; Indredavik, Bent; Mathiesen, Ellisiv B. (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06)
      Introduction: Population-based knowledge of the characteristics of wake-up stroke and unknown-onset stroke is limited. We compared occurrence and characteristics of ischaemic and haemorrhagic wake-up stroke, unknown-onset stroke and known-onset stroke in a nationwide register-based study. <p> <p>Patients and methods: We included patients registered in the Norwegian Stroke Register from 2012 through ...