Browsing Bergen Open Research Archive by Author "Bartz-Johannessen, Christoffer"
Now showing items 1-16 of 16
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The association between cytokines and psychomotor speed in a spectrum of psychotic disorders: A longitudinal study
Larsen, Jeanette Brun; Reitan, Solveig Merete Klæbo; Løberg, Else-Marie; Rettenbacher, Maria; Bruserud, Øystein; Larsen, Tor Ketil; Anda, Liss Gøril; Bartz-Johannessen, Christoffer; Johnsen, Erik; Kroken, Rune Andreas (Journal article, 2021)Background In schizophrenia, impaired psychomotor speed is a common symptom predicting worse functional outcome. Inflammation causes changes in white matter integrity, which may lead to reduced psychomotor speed. Therefore, ... -
Cellular adhesion molecules in drug-naïve and previously medicated patients with schizophrenia-spectrum disorders
Gjerde, Kristian Varden; Bartz-Johannessen, Christoffer; Steen, Vidar Martin; Andreassen, Ole A.; Steen, Nils Eiel; Ueland, Thor; Lekva, Tove; Rettenbacher, Maria; Joa, Inge; Reitan, Solveig Klæbo; Johnsen, Erik; Kroken, Rune Andreas (Journal article; Peer reviewed, 2024)Background Endothelial inflammation may be involved in the pathogenesis of schizophrenia, and cellular adhesion molecules (CAMs) on endothelial cells may facilitate leukocyte binding and transendothelial migration of cells ... -
Childhood trauma types in relation to antipsychotic effectiveness in schizophrenia spectrum disorders: A prospective, pragmatic, randomized controlled study
Mørkved, Nina; Johnsen, Erik; Kroken, Rune Andreas; Joa, Inge; Kjelby, Eirik; Rettenbacher, M.A.; Bartz-Johannessen, Christoffer; Løberg, Else-Marie (Journal article; Peer reviewed, 2024)Treatment with antipsychotics (APs) for schizophrenia spectrum disorders (SSDs) is generally effective, however, a significant proportion does not respond favorably. Childhood trauma (CT) subtypes (physical, sexual, and ... -
Differential Effectiveness of Atypical Antipsychotics on Hallucinations: A Pragmatic Randomized Controlled Trial
Sinkeviciute, Igne; Hugdahl, Kenneth Jan; Bartz-Johannessen, Christoffer; Kroken, Rune Andreas; Løberg, Else-Marie; Kjelby, Eirik; Rettenbacher, maria; Joa, Inge; Reitan, Solveig Merete Klæbo; Alisauskiene, Renata; Fathian, Farivar; Johnsen, Erik (Journal article; Peer reviewed, 2021-07)Background Most studies investigating antipsychotic effectiveness report either total psychopathology or symptom cluster findings. Studies focusing on a separate symptom, such as hallucinations, a hallmark symptom in ... -
Electroconvulsive therapy triggers a reversible decrease in brain N-acetylaspartate
Erchinger, Vera Jane; Craven, Alexander R.; Ersland, Lars; Oedegaard, Ketil J.; Bartz-Johannessen, Christoffer; Hammar, Åsa Karin; Haavik, Jan; Riemer, Frank; Kessler, Ute; Oltedal, Leif (Journal article; Peer reviewed, 2023)Introduction: Based on previous research on electroconvulsive therapy (ECT) we have proposed a model where disruption, potentiation, and rewiring of brain networks occur in sequence and serve as the underlying therapeutic ... -
Homogeneity in prediction of survival probabilities for subcategories of hipprosthesis data: The Nordic Arthroplasty Register Association, 2000-2013
Bartz-Johannessen, Christoffer; Furnes, Ove; Fenstad, Anne Marie; Lie, Stein Atle; Pedersen, Alma Becic; Overgaard, Søren; Kärrholm, Johan; Malchau, Henrik; Mäkelä, Keijo; Eskelinen, Antti; Wilkinson, Jeremy M (Peer reviewed; Journal article, 2019-07-10)Introduction: The four countries in the Nordic Arthroplasty Register Association (NARA) share geographic proximity, culture, and ethnicity. Pooling data from different sources in order to obtain higher precision and accuracy ... -
Hospital volume and the risk of revision in Oxford unicompartmental knee arthroplasty in the Nordic countries -an observational study of 14,496 cases
Badawy, Mona; Fenstad, Anne Marie; Bartz-Johannessen, Christoffer; Indrekvam, Kari; Havelin, Leif Ivar; Robertsson, Otto; W-Dahl, Annette; Eskelinen, Antti; Mäkelä, Keijo; Pedersen, Alma B.; Schrøder, Henrik M.; Furnes, Ove (Peer reviewed; Journal article, 2017-09-07)Background High procedure volume and dedication to unicompartmental knee arthroplasty (UKA) has been suggested to improve revision rates. This study aimed to quantify the annual hospital volume effect on revision risk in ... -
Illicit substances detected through high-resolution MS analysis in urine samples are associated with greater symptom burden in patients with psychosis
Skrede, Silje; Berg, Jon Andsnes; Fossan, Kjell Ove; Bartz-Johannessen, Christoffer; Løberg, Else-Marie; Kroken, Rune Andreas; Johnsen, Erik (Journal article, 2021)Background The prevalence of new psychoactive substances (NPS) in acute psychotic patients has not been investigated systematically. We applied a highly sensitive and specific mass spectrometry method for detection of NPS ... -
Operating room ventilation-Validation of reported data on 108 067 primary total hip arthroplasties in the Norwegian Arthroplasty Register
Langvatn, Håkon; Bartz-Johannessen, Christoffer; Schrama, Johannes Cornelis; Hallan, Geir; Furnes, Ove; Lingaas, Egil; Walenkamp, Geert; Engesæter, Lars B.; Dale, Håvard (Peer reviewed; Journal article, 2020)Rationale, aims, and objectives: The true effect of laminar airflow (LAF) systems on postoperative infection is disputed, partly due to uncertainty regarding the validity of ventilation data in register studies. The aim ... -
Overactive, aggressive, disruptive and agitated behavior associated with the use of psychotropic medications in schizophrenia
Strømme, Maria Fagerbakke; Bartz-Johannessen, Christoffer; Kroken, Rune Andreas; Mehlum, Lars; Johnsen, Erik (Journal article; Peer reviewed, 2022)Background: Evidence is limited for the associations between use of psychotropic medications and overactive, aggressive, disruptive or agitated behavior (OADA)1 in clinical practice. Aims: To investigate the associations ... -
Patients with schizophrenia and bipolar disorder display a similar global gene expression signature in whole blood that reflects elevated proportion of immature neutrophil cells with association to lipid changes
Torsvik, Anja; Brattbakk, Hans-Richard; Trentani, Andrea; Holdhus, Rita; Stansberg, Christine; Bartz-Johannessen, Christoffer; Hughes, Timothy; Steen, Nils Eiel; Melle, Ingrid; Djurovic, Srdjan; Andreassen, Ole; Steen, Vidar Martin (Journal article; Peer reviewed, 2023)Schizophrenia (SCZ) and bipolar disorder (BD) share clinical characteristics, genetic susceptibility, and immune alterations. We aimed to identify differential transcriptional patterns in peripheral blood cells of patients ... -
Personalized estimation of one-year mortality risk after elective hip or knee arthroplasty for osteoarthritis.
Trela-Larsen, L; Kroken, Gard; Bartz-Johannessen, Christoffer; Sayers, Adele; Aram, P; McCloskey, Eugene; Kadirkamanathan, V; Blom, A; Lie, Stein Atle; Furnes, Ove; Wilkinson, J. Mark (Journal article; Peer reviewed, 2020)Aims To develop and validate patient-centred algorithms that estimate individual risk of death over the first year after elective joint arthroplasty surgery for osteoarthritis. Methods A total of 763,213 hip and knee ... -
Risk factors for mortality in patients admitted to a psychiatric acute ward: A prospective cohort study
Strømme, Maria Fagerbakke; Bartz-Johannessen, Christoffer; Kjelby, Eirik; Mehlum, Lars; Mykletun, Arnstein; Kroken, Rune Andreas; Johnsen, Erik; Gjestad, Rolf (Journal article; Peer reviewed, 2024)Introduction: Associations between psychiatric disorders and mortality have been extensively studied, but limited evidence exists regarding influence of clinical characteristics on mortality risk, at the time of acute ... -
Trajectories of response in schizophrenia-spectrum disorders: A one-year prospective cohort study of antipsychotic effectiveness
Drosos, Petros; Johnsen, Erik; Bartz-Johannessen, Christoffer; Larsen, Tor Ketil; Reitan, Solveig Klæbo; Rettenbacher, Maria; Kroken, Rune Andreas (Journal article; Peer reviewed, 2022)Background: Antipsychotic drugs remain the mainstay of schizophrenia treatment; however, their effectiveness has been questioned, and it is not possible to predict the response to a specific antipsychotic drug in an ... -
Unmasking Patient Diversity: Exploring Cognitive and Antidepressive Effects of Electroconvulsive Therapy
Sellevåg, Kjersti; Bartz-Johannessen, Christoffer; Ødegaard, Ketil Joachim; Nordenskjöld, Axel; Mohn, Hanne Christine; Bjørke, Jeanette Solheimslid; Kessler, Ute (Journal article; Peer reviewed, 2024)Background Electroconvulsive therapy (ECT) is an established treatment for depression, but more data on effectiveness and safety in clinical practice is needed. The aim of this register-based study was to investigate ... -
Use of Benzodiazepines and Antipsychotic Drugs Are Inversely Associated with Acute Readmission Risk in Schizophrenia
Strømme, Maria Fagerbakke; Mellesdal, Liv Solrunn; Bartz-Johannessen, Christoffer; Kroken, Rune Andreas; Krogenes, Marianne Leiknes; Mehlum, Lars; Johnsen, Erik (Journal article; Peer reviewed, 2022)Purpose: Little is known about the impact of different psychotropic drugs on acute readmission risk, when used concomitantly in a real-life setting. We aimed to investigate the association between acute readmission risk ...