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Browsing Bergen Open Research Archive by Author "Matre, Knut"

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Now showing items 1-11 of 11

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    • Carvedilol-enriched cold oxygenated blood cardioplegia improves left ventricular diastolic function after weaning from cardiopulmonary bypass 

      Dahle, Geir Olav; Salminen, Pirjo-Riitta; Moen, Christian Arvei; Eliassen, Finn; Nygreen, Else Loholdt; Kytö, Ville; Saukko, Pekka; Haaverstad, Rune; Matre, Knut; Grong, Ketil (Peer reviewed; Journal article, 2016-08)
      Objectives: To investigate whether adding carvedilol, a nonselective β- and selective α1-receptor blocking agent with antioxidant properties, to oxygenated blood cardioplegia improves myocardial function after weaning from ...
    • Esmolol added in repeated, cold, oxygenated blood cardioplegia improves myocardial function after cardiopulmonary bypass 

      Dahle, Geir Olav; Salminen, Pirjo-Riitta; Moen, Christian Arvei; Eliassen, Finn; Jonassen, Anne K.; Haaverstad, Rune; Matre, Knut; Grong, Ketil (Peer reviewed; Journal article, 2015-06)
      Objective: This study investigated if the β-receptor blocking agent esmolol, added to standard oxygenated blood cardioplegia, improved myocardial function after weaning from bypass. Design: A block-randomized, blinded ...
    • Impact of arterio–ventricular interaction on first-phase ejection fraction in aortic stenosis 

      Einarsen, Eigir; Hjertaas, Johannes; Gu, Haotian; Matre, Knut; Chowienczyk, Philip J.; Gerdts, Eva; Chambers, John B.; Saeed, Sahrai (Peer reviewed; Journal article, 2020)
      Aims:  First-phase ejection fraction (EF1), the EF at the time to peak aortic jet velocity, has been proposed as a novel marker of peak systolic function in aortic stenosis (AS). This study aimed to explore the association ...
    • The influence of acute unloading on left ventricular strain and strain rate by speckle tracking echocardiography in a porcine model 

      Dahle, Geir Olav; Stangeland, Lodve; Moen, Christian Arvei; Salminen, Pirjo-Riitta; Haavestad, Rune; Matre, Knut; Grong, Ketil (Peer reviewed; Journal article, 2016)
      Noninvasive measurements of myocardial strain and strain rate by speckle tracking echocardiography correlate to cardiac contractile state but also to load, which may weaken their value as indices of inotropy. In a porcine ...
    • Is strain by Speckle Tracking Echocardiography dependent on user controlled spatial and temporal smoothing? An experimental porcine study 

      Moen, Christian A.; Salminen, Pirjo-Riitta; Dahle, Geir O.; Hjertaas, Johannes J.; Grong, Ketil; Matre, Knut (Peer reviewed; Journal article, 2013-08-22)
      Background Speckle Tracking Echocardiography (STE) strain analysis relies on both spatial and temporal smoothing. The user is often allowed to adjust these smoothing parameters during analysis. This experimental study ...
    • Left ventricular dysfunction after two hours of polarizing or depolarizing cardioplegic arrest in a porcine model 

      Aass, Terje; Stangeland, Lodve; Moen, Christian Arvei; Solholm, Atle; Dahle, Geir Olav; Chambers, David J.; Urban, Malte; Nesheim, Knut; Haaverstad, Rune; Matre, Knut; Grong, Ketil (Peer reviewed; Journal article, 2019)
      Introduction: This experimental study compares myocardial function after prolonged arrest by St. Thomas’ Hospital polarizing cardioplegic solution (esmolol, adenosine, Mg2+) with depolarizing (hyperkalaemic) St. Thomas’ ...
    • A left ventricular phantom for 3D echocardiographic twist measurements 

      Hjertaas, Johannes Just; Matre, Knut (Peer reviewed; Journal article, 2020)
      Traditional two-dimensional (2D) ultrasound speckle tracking echocardiography (STE) studies have shown a wide range of twist values, also for normal hearts, which is due to the limitations of short-axis 2D ultrasound. The ...
    • Myocardial energy metabolism and ultrastructure with polarizing and depolarizing cardioplegia in a porcine model 

      Aass, Terje; Stangeland, Lodve; Chambers, David J.; Hallstrõm, Seth; Rossmann, Christine; Podesser, Bruno K.; Urban, Malte; Nesheim, Knut; Haaverstad, Rune; Matre, Knut; Grong, Ketil (Peer reviewed; Journal article, 2017-03-02)
      OBJECTIVES: This study investigated whether the novel St. Thomas’ Hospital polarizing cardioplegic solution (STH-POL) with esmolol/adenosine/magnesium offers improved myocardial protection by reducing demands for high-energy ...
    • Myocardial function after polarizing versus depolarizing cardiac arrest with blood cardioplegia in a porcine model of cardiopulmonary bypass 

      Aass, Terje; Stangeland, Lodve; Moen, Christian Arvei; Salminen, Pirjo-Riitta; Dahle, Geir Olav; Chambers, David J.; Markou, Thomais; Eliassen, Finn; Urban, Malte; Haaverstad, Rune; Matre, Knut; Grong, Ketil (Peer reviewed; Journal article, 2016)
      OBJECTIVES Potassium-based depolarizing St Thomas' Hospital cardioplegic solution No 2 administered as intermittent, oxygenated blood is considered as a gold standard for myocardial protection during cardiac surgery. ...
    • Myocardial function in aortic stenosis - insights from radial multilayer Doppler strain 

      Cramariuc, Dana; Gerdts, Eva; Hjertaas, Johannes Just; Cramariuc, Alexandru; Davidsen, Einar Skulstad; Matre, Knut (Peer reviewed; Journal article, 2015-02-19)
      Background Left ventricular (LV) radial tissue Doppler imaging (TDI) strain increases gradually from the subepicardial to the subendocardial layer in healthy individuals. A speckle tracking echocardiography study suggested ...
    • Reperfusion Therapy with Low-Dose Insulin or Insulin-Like Growth Factor 2; Myocardial Function and Infarct Size in a Porcine Model of Ischaemia and Reperfusion 

      Salminen, Pirjo-Riitta; Dahle, Geir Olav; Moen, Christian Arvei; Wergeland, Anita; Jonassen, Anne Kristin; Haaverstad, Rune; Matre, Knut; Grong, Ketil (Peer reviewed; Journal article, 2014-05-19)
      In an open-chest porcine model, we examined whether myocardial pharmacological conditioning at the time of reperfusion with low-dose insulin or insulin-like growth factor 2 (IGF2), not affecting serum glucose levels, could ...

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