Blar i Bergen Open Research Archive på forfatter "Matre, Knut"
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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 ... -
Covariables of Myocardial Function in Women and Men with Increased Body Mass Index
Pristaj, Nadia; Saeed, Sahrai; Midtbø, Helga Bergljot; Halland, Hilde; Matre, Knut; Gerdts, Eva (Journal article; Peer reviewed, 2020)Introduction Sex-difference in types of cardiac organ damage has been reported in subjects with increased body mass index (BMI). However less is known about sex-differences in left ventricular (LV) myocardial function ... -
Effect of Temporal and Spatial Smoothing on Speckle–Tracking‑Derived Strain in Neonates
Khan, Muhammad Umael; Omdal, Tom Roar; Greve, Gottfried; Grong, Ketil; Matre, Knut (Journal article; Peer reviewed, 2021)Clinical application of strain in neonates requires an understanding of which image acquisition and processing parameters affect strain values. Previous studies have examined frame rate, transmitting frequency, and vendor ... -
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 ... -
The influence of region of interest width in fetal 2D-speckle tracking echocardiography late in pregnancy
Omdal, Tom Roar; Khan, Muhammad Umael; Ebbing, Cathrine; Kessler, Jörg; Karlsen, Henriette Odland; Leirgul, Elisabeth; Matre, Knut; Greve, Gottfried (Journal article; Peer reviewed, 2021)Speckle tracking echocardiography is a promising method for assessment of myocardial function in fetal and neonatal hearts, but further studies are necessary to validate and optimize the settings for use in fetal cardiology. ... -
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 ... -
One-year impact of bariatric surgery on left ventricular mechanics: results from the prospective FatWest study
Grymyr, Lisa Marie Dale; Nadirpour, Saied; Gerdts, Eva; Nedrebø, Bjørn Gunnar; Hjertaas, Johannes Just; Matre, Knut; Cramariuc, Dana (Journal article; Peer reviewed, 2021)Aims Patients with severe obesity are predisposed to left ventricular (LV) hypertrophy, increased myocardial oxygen demand, and impaired myocardial mechanics. Bariatric surgery leads to rapid weight loss and improves ... -
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 ... -
Speckle tracking derived strain in neonates: planes, layers and drift
Khan, Muhammad Umael; Omdal, Tom R.; Matre, Knut; Greve, Gottfried (Journal article; Peer reviewed, 2021)The aims of this study was to assess the effect of using a four chamber versus a three plane model on speckle tracking derived global longitudinal strain, the effects of drift compensation, the effect of assessing strain ...