P
Petter Andreas Ringen
Researcher at Oslo University Hospital
Publications - 49
Citations - 2528
Petter Andreas Ringen is an academic researcher from Oslo University Hospital. The author has contributed to research in topics: Bipolar disorder & Schizophrenia. The author has an hindex of 24, co-authored 41 publications receiving 2208 citations. Previous affiliations of Petter Andreas Ringen include University of Oslo.
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Journal ArticleDOI
Neurocognitive Dysfunction in Bipolar and Schizophrenia Spectrum Disorders Depends on History of Psychosis Rather Than Diagnostic Group
Carmen Simonsen,Kjetil Sundet,Anja Vaskinn,Astrid B. Birkenaes,John A. Engh,John A. Engh,A. Faerden,A. Faerden,Halldóra Jónsdóttir,Halldóra Jónsdóttir,Petter Andreas Ringen,Stein Opjordsmoen,Stein Opjordsmoen,Ingrid Melle,Ingrid Melle,Svein Friis,Svein Friis,Ole A. Andreassen,Ole A. Andreassen +18 more
TL;DR: The findings suggest that neurocognitive dysfunction in bipolar and schizophrenia spectrum disorders is determined more by history of psychosis than by Diagnostic and Statistical Manual of Mental Disorders (Fourth Edition) diagnostic category or subtype, supporting a more dimensional approach in future diagnostic systems.
Journal ArticleDOI
Increased mortality in schizophrenia due to cardiovascular disease - a non-systematic review of epidemiology, possible causes, and interventions.
Petter Andreas Ringen,Petter Andreas Ringen,John A. Engh,Astrid B. Birkenaes,Ingrid Dieset,Ingrid Dieset,Ole A. Andreassen,Ole A. Andreassen +7 more
TL;DR: There is an urgent need to develop and implement effective programs to increase life expectancy in schizophrenia, and it is argued that mental health workers should be more involved in this important task.
Journal ArticleDOI
Neurocognitive profiles in bipolar I and bipolar II disorder: differences in pattern and magnitude of dysfunction
Carmen Simonsen,Kjetil Sundet,Anja Vaskinn,Astrid B. Birkenaes,John A. Engh,Charlotte Fredslund Hansen,Halldóra Jónsdóttir,Petter Andreas Ringen,Stein Opjordsmoen,Svein Friis,Ole A. Andreassen +10 more
TL;DR: Bipolar I patients have more widespread cognitive dysfunction both in pattern and magnitude, and a higher proportion has clinically significant cognitive impairments compared with patients with bipolar II, which may suggest neurobiological differences between the two bipolar subgroups.
Journal ArticleDOI
Predictors of medication adherence in patients with schizophrenia and bipolar disorder.
Halldóra Jónsdóttir,Halldóra Jónsdóttir,Stein Opjordsmoen,Stein Opjordsmoen,Astrid B. Birkenaes,Astrid B. Birkenaes,Carmen Simonsen,John A. Engh,John A. Engh,Petter Andreas Ringen,Anja Vaskinn,Svein Friis,Svein Friis,Kjetil Sundet,Kjetil Sundet,Ole A. Andreassen,Ole A. Andreassen +16 more
TL;DR: Investigation of potential risk factors for medication non‐adherence in patients with schizophrenia and bipolar disorder finds correlations with prior use of medication and suicidal ideation.
Journal ArticleDOI
Medication adherence in outpatients with severe mental disorders: relation between self-reports and serum level.
Halldóra Jónsdóttir,Stein Opjordsmoen,Astrid B. Birkenaes,John A. Engh,Petter Andreas Ringen,Anja Vaskinn,Trond Aamo,Svein Friis,Ole A. Andreassen +8 more
TL;DR: In this naturalistic sample, outpatients with severe mental disorders showed relatively good adherence to prescribed medication, and self-report questionnaires seem to be a valid method for measuring adherence.