Browsing UiS Brage by Author "Kvaløy, Jan Terje"
Now showing items 1-20 of 65
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A Class of Tests for Trend in Time Censored Recurrent Event Data
Kvaløy, Jan Terje; Lindqvist, Bo Henry (Journal article; Peer reviewed, 2019-04)Statistical tests for trend in recurrent event data not following a Poisson process are generally constructed for event censored data. However, time censored data are more frequently encountered in practice. In this paper ... -
A machine learning approach to identify regions in the myocardium with information indicative of the risk of arrhythmia in patients with previous myocardial infarction
Berg, Gøran Jansson (Master thesis, 2021) -
Air versus Sulfur Hexafluoride Gas Tamponade for Small and Medium-Sized Macular Holes: A Randomized Noninferiority Trial
Lindtjørn, Birger; Krohn, Jørgen Gitlesen; Haugstad, Marta; Stene-Johansen, Ingar; Austeng, Dordi; Basit, Samy; Fossen, Kristian Anker; Varhaug, Pål; Kvaløy, Jan Terje; Forsaa, Vegard Asgeir (Peer reviewed; Journal article, 2022)Purpose To investigate whether air tamponade is noninferior to sulfur hexafluoride (SF6) gas tamponade for small (≤ 250 μm) and medium-sized (> 250 μm and ≤ 400 μm) macular holes (MHs). Design Multicenter, randomized ... -
An automatic system for the comprehensive retrospective analysis of cardiac rhythms in resuscitation episodes
Rad, Ali Bahrami; Eftestøl, Trygve Christian; Irusta, Unai; Kvaløy, Jan Terje; Wik, Lars; Kramer-Johansen, Jo; Katsaggelos, Aggelos K.; Engan, Kjersti (Journal article; Peer reviewed, 2018)AIM: An automatic resuscitation rhythm annotator (ARA) would facilitate and enhance retrospective analysis of resuscitation data, contributing to a better understanding of the interplay between therapy and patient response. ... -
Anastomotic leak after surgery for colon cancer and effect on long‐term survival
Stormark, Kjartan; Krarup, Peter-Martin; Sjövall, Annika; Søreide, Kjetil; Kvaløy, Jan Terje; Nordholm-Carstensen, Andreas; Nedrebø, Bjørn Steinar Olden; Kørner, Hartwig (Peer reviewed; Journal article, 2020-02)Aim An anastomotic leak after surgery for colon cancer is a recognized complication but how it may adversely affect long‐term survival is less clear because data are scarce. The aim of the study was to investigate the ... -
Comparison of heart rate feedback from dry-electrode ecg, 3-lead ecg, and pulse oximetry during newborn resuscitation
Rettedal, Siren; Eilevstjønn, Joar; Kibsgaard, Amalie; Kvaløy, Jan Terje; Ersdal, Hege Langli (Peer reviewed; Journal article, 2021-11)Background: Assessment of heart rate (HR) is essential during newborn resuscitation, and comparison of dry-electrode ECG technology to standard monitoring by 3-lead ECG and Pulse Oximetry (PO) is lacking. Methods: NeoBeat, ... -
Covariate order tests for covariate effect
Kvaløy, Jan Terje (Journal article; Peer reviewed, 2002)A new approach for constructing tests for association between a random right censored life time variable and a covariate is proposed. The basic idea is to first arrange the observations in increasing order of the covariate ... -
Cytokine network in adults with falciparum malaria and HIV-1: increased IL-8 and IP-10 levels are associated with disease severity
Berg, Åse; Patel, Sam; Gonca, Miguel; Catarina, David; Otterdal, Kari; Ueland, Thor; Dalen, Ingvild; Kvaløy, Jan Terje; Mollnes, Tom Eirik; Aukrust, Pål; Langeland, Nina (Journal article, 2014-12)Background: Co-infection with malaria and HIV increases the severity and mortality of both diseases, but the cytokine responses related to this co-infection are only partially characterised. The aim of this study was ... -
Determination of lower cut-off levels of adalimumab associated with biochemical remission in Crohn's disease
Carlsen, Arne; Omdal, Roald; Karlsen, Lars Normann; Kvaløy, Jan Terje; Aabakken, Lars; Steinsbø, Øyvind; Bolstad, Nils; Warren, David; Lundin, Knut Erik Aslaksen; Grimstad, Tore (Journal article; Peer reviewed, 2019-08)Background and Aim: Adalimumab is administered and dosed using a standardized treatment regimen. Although therapeutic drug monitoring (TDM) may help optimize treatment efficacy, the lower cut-off concentration of adalimumab ... -
Epidemiology and classification of gastroenteropancreatic neuroendocrine neoplasms using current coding criteria
Sandvik, Oddvar Mathias; Søreide, Kjetil; Gudlaugsson, Einar; Kvaløy, Jan Terje; Søreide, Jon Arne (Journal article; Peer reviewed, 2015-09)Background: The lack of uniform criteria for coding of gastroenteropancreatic neuroendocrine neoplasia (GEP-NEN) has hampered previous epidemiological studies. The epidemiology of GEP-NEN was investigated in this study ... -
Epidemiology of abdominal trauma: An age- and sex-adjusted incidence analysis with mortality patterns
Larsen, Johannes Wiik; Søreide, Kjetil; Søreide, Jon Arne; Tjosevik, Kjell E; Kvaløy, Jan Terje; Thorsen, Kenneth (Peer reviewed; Journal article, 2022)Purpose Abdominal injuries may occur in up to one-third of all patients who suffer severe trauma, but little is known about epidemiological trends and characteristics in a Northern European setting. This study investigated ... -
The escherichia coli alkA gene is activated to alleviate mutagenesis by an oxidized deoxynucleoside
Grøsvik, Kristin; Tesfahun, Almaz Nigatu; Muruzábal-Lecumberri, Izaskun; Haugland, Gyri Teien; Leiros, Ingar; Ruoff, Peter; Kvaløy, Jan Terje; Knævelsrud, Ingeborg; Ånensen, Hilde; Alexeeva, Marina; Sato, Kousuke; Matsuda, Akira; Alseth, Ingrun; Klungland, Arne; Bjelland, Svein (Peer reviewed; Journal article, 2020)The cellular methyl donor S-adenosylmethionine (SAM) and other endo/exogenous agents methylate DNA bases non-enzymatically into products interfering with replication and transcription. An important product is 3-methyladenine ... -
Factors Affecting the Course of Resuscitation From Cardiac Arrest With Pulseless Electrical Activity in Children and Adolescents
Skogvoll, Eirik; Nordseth, Trond; Sutton, Robert M.; Eftestøl, Trygve Christian; Irusta, Unai; Aramendi, Elisabete; Niles, Dana E.; Nadkarni, Vinay M.; Berg, Robert A.; Abella, Benjamin S.; Kvaløy, Jan Terje (Peer reviewed; Journal article, 2020)Background: Although in-hospital pediatric cardiac arrests and cardiopulmonary resuscitation occur >15,000/year in the US, few studies have assessed which factors affect the course of resuscitation in these patients. We ... -
Fatigue: a frequent and biologically based phenomenon in newly diagnosed celiac disease
Skjellerudsveen, Berit Mære; Omdal, Roald; Hetta, Anne Kristine; Kvaløy, Jan Terje; Aabakken, Lars; Skoie, Inger Marie; Grimstad, Tore Bjørn (Peer reviewed; Journal article, 2022)Fatigue is increasingly recognized as a major complaint in patients with chronic inflammatory and autoimmune diseases. Although fatigue is assumed to represent a significant problem in celiac disease, existing knowledge ... -
Frequent refresher training on newborn resuscitation and potential impact on perinatal outcome over time in a rural Tanzanian hospital: An observational study
Mduma, Estomih; Kvaløy, Jan Terje; Søreide, Eldar; Svensen, Erling; Mdoe, Paschal Francis; Perlman, Jeffrey; Johnson, Caroline Amy; Hussein, Kidanto; Ersdal, Hege Langli (Peer reviewed; Journal article, 2019-09)Objectives Globally, perinatal mortality remains high, especially in sub-Saharan countries, mainly because of inadequate obstetric and newborn care. Helping Babies Breathe (HBB) resuscitation training as part of a continuous ... -
Handling estimation error in Statistical Process Control with EWMA charts
Evangelou, Alexandra (Masteroppgave/UIS-TN-IMF/2020;, Master thesis, 2020-06)This master thesis studies the process control analysis using control charts. It starts with a detailed presentation of the basic types of control charts, with a special focus on the EWMA control chart. An excessive ... -
Heart rate and QRS duration as biomarkers predict the immediate outcome from pulseless electrical activity
Norvik, Anders; Kvaløy, Jan Terje; Skjeflo, Gunnar Waage; Bergum, Daniel; Nordseth, Trond; Loennechen, Jan Pål; Unneland, Eirik; Buckler, D.G.; Bhardwaj, A.; Eftestøl, Trygve Christian; Aramendi, E.; Abella, BS.; Skogvoll, Eirik (Peer reviewed; Journal article, 2023)Introduction Pulseless electrical activity (PEA) is commonly observed in in-hospital cardiac arrest (IHCA). Universally available ECG characteristics such as QRS duration (QRSd) and heart rate (HR) may develop differently ... -
Heat shock proteins and chronic fatigue in primary Sjögren's syndrome
Bårdsen, Kjetil; Mæland, Mari; Kvaløy, Jan Terje; Norheim, Katrine Brække; Jonsson, Grete; Omdal, Roald (Journal article; Peer reviewed, 2016-01)Fatigue occurs frequently in patients with cancer, neurological diseases and chronic inflammatory diseases, but the biological mechanisms that lead to and regulate fatigue are largely unknown. When ... -
Heat-shock protein 90α in plasma reflects severity of fatigue in patients with Crohn’s disease
Grimstad, Tore; Kvivik, Ingeborg; Kvaløy, Jan Terje; Aabakken, Lars; Omdal, Roald (Journal article; Peer reviewed, 2019-10)Heat-shock proteins (HSPs) are evolutionarily conserved proteins with important cellular homeostasis functions during harmful conditions, including inflammation. Some HSPs are secreted extracellularly and act on distant ... -
High mobility group box 1 and a network of other biomolecules influence fatigue in patients with Crohn’s disease
Kvivik, Ingeborg; Grimstad, Tore Bjørn; Bårdsen, Kjetil; Jonsson, Grete; Kvaløy, Jan Terje; Omdal, Roald (Peer reviewed; Journal article, 2023-06)Background Fatigue is common in patients with chronic inflammatory and autoimmune diseases, often with a severe impact on the patient’s daily life. From a biological point of view, fatigue can be regarded as an element ...