Halvor Øygarden

• Boland, Solveig; Chaudry Nawaz, Beenish Adeel; Øygarden, Halvor; Fromm, Annette; Næss, Halvor & Waje-Andreassen, Ulrike (2023). Verified Parental Cardiovascular Events for Young and Middle-Aged Ischaemic Stroke Patients and Controls. Acta Neurologica Scandinavica. ISSN 0001-6314. 2023. doi: 10.1155/2023/3864506. Full text in Research Archive Show summary

  Introduction. Nonmodifiable cardiovascular risk factors, like age and sex, are easily quantifiable. Due to immense technical progress in diagnostics and medical data storage, the aim of this study was to quantify, verify, and to compare parental cardiovascular events (CVE) as an additional nonmodifiable risk factor for young and middle-aged ischaemic stroke patients and controls. Methods. Information about parental CVE was first obtained by standardized questionnaires answered by 385 acute ischaemic stroke patients (15-60 years of age) and 260 controls. After consent to contact living and include deceased parents, patients and controls provided necessary personal identification of their parents. Thereafter, CVE were verified by standardized questionnaires answered by parents or medical records in case of deceased parents. Results. One hundred-and-nine (14.2%) of 770 patient parents vs. 128 (24.6%) of 520 control parents were not available for verification. Active participation was obtained for 229 (73.9%) of 310 patient parents vs.113 (58.2%) of 194 control parents. Medical record verification was obtained for 192 (54.7%) of 351 deceased patient parents, vs.103 (52.0%) of 198 deceased control parents. This study showed highest death rates of fathers (65.3% patient fathers and 57.6% control fathers) and highest numbers of CVE, especially myocardial infarction among patient fathers of patients aged 50-60 years. Discussion and Conclusion. Obtaining verified parental CVE as a nonmodifiable risk factor is still challenging, despite widely available digital medical information. To attain more accurate information on parental CVE, we recommend active involvement of family members in addition to medical record verification, especially for patients aged <50 years. Trial Registration. This trial is registered with NCT01597453

• Søvik, Olav; Tveiten, Arnstein; Øygarden, Halvor; Stokkeland, Pål Johan; Hetland, Hanne Brit & Schneider, Magnus Sundgot [Show all 14 contributors for this article] (2023). Virtual reality simulation training in stroke thrombectomy centers with limited patient volume—Simulator performance and patient outcome. Interventional Neuroradiology. ISSN 1591-0199. doi: 10.1177/15910199231198275. Full text in Research Archive Show summary

  BackgroundVirtual reality simulation training may improve the technical skills of interventional radiologists when establishing endovascular thrombectomy at limited-volume stroke centers. The aim of this study was to investigate whether the technical thrombectomy performance of interventional radiologists improved after a defined virtual reality simulator training period. As part of the quality surveillance of clinical practice, we also assessed patient outcomes and thrombectomy quality indicators at the participating centers. MethodsInterventional radiologists and radiology residents from three thrombectomy-capable stroke centers participated in a five months thrombectomy skill-training curriculum on a virtual reality simulator. The simulator automatically registered procedure time, the number of predefined steps that were correctly executed, handling errors, contrast volume, fluoroscopy time, and radiation dose exposure. The design was a before-after study. Two simulated thrombectomy cases were used as pretest and posttest cases, while seven other cases were used for training. Utilizing the Norwegian Stroke Register, we investigated clinical results in thrombectomy during the study period. ResultsNineteen interventional radiologists and radiology residents participated in the study. The improvement between pretest and posttest cases was statistically significant for all outcome measures in both simulated cases, except for the contrast volume used in one case. Clinical patient outcomes in all three centers were well within the recommendations from multi-society consensus guidelines. ConclusionPerformance on the virtual reality simulator improved after training. Virtual reality simulation may improve the learning curve for interventional radiologists in limited-volume thrombectomy centers. No correlation alleged, the clinical data indicates that the centers studied performed thrombectomy in accordance with guideline-recommended standards.

• Søyland, Mary-Helen; Tveiten, Arnstein; Eltoft, Agnethe; Øygarden, Halvor; Varmdal, Torunn & Indredavik, Bent [Show all 7 contributors for this article] (2022). Wake-up stroke and unknown-onset stroke; occurrence and characteristics from the nationwide Norwegian Stroke Register. European Stroke Journal. ISSN 2396-9873. 7(2), p. 143–150. doi: 10.1177/23969873221089800. Full text in Research Archive Show summary

  Introduction: Population-based knowledge of the characteristics of wake-up stroke and unknown-onset stroke is limited. We compared occurrence and characteristics of ischaemic and haemorrhagic wake-up stroke, unknown-onset stroke and known-onset stroke in a nationwide register-based study. Patients and methods: We included patients registered in the Norwegian Stroke Register from 2012 through 2019. Age, sex, risk factors, clinical characteristics, acute stroke treatment and discharge destination were compared according to stroke type and time of onset. Results: Of the 60,320 patients included, 11,451 (19%) had wake-up stroke, 11,098 (18.4%) had unknown time of onset and 37,771 (62.6%) had known symptom onset. The proportion of haemorrhagic stroke was lower among wakeup stroke patients (1107/11,451, 9.7%, 95% CI: 9.1–10.2) than for known-onset stroke (5230/37,771, 13.8%, 95% CI: 13.5–14.2) and for unknown-onset stroke (1850/11,098, 16.7%, 95% CI: 16.0–17.4). Mild stroke (NIHSS <5) was more frequent in ischaemic wake-up stroke (5364/8308, 64.6%, 95% CI: 63.5–65.5) than in known-onset (16,417/26,746, 61.4%, 95% CI: 60.8–62.0) and unknown-onset stroke (3242/5853, 55.4%, 95% CI: 54.1–56.7), while baseline characteristics were otherwise similar to known-onset stroke. Unknown-onset stroke patients were more often female, lived alone and had more severe strokes compared to wake-up stroke and known-onset stroke patients. Unknown-onset stroke patients were more often in need of community-based health care on discharge and had a higher in-hospital mortality. Discussion and conclusions: Ischaemic wake-up strokes shared baseline characteristics with known-onset strokes, but tended to be milder. Ischaemic unknown-onset stroke patients differed significantly from wake-up stroke, emphasising the importance of considering them as separate entities.

• Chaudhry Nawaz, Beenish Adeel; Fromm, Annette; Øygarden, Halvor; Eide, Geir Egil; Saeed, Sahrai & Meijer, Rudy [Show all 11 contributors for this article] (2022). Vascular risk factors and staging of atherosclerosis in patients and controls: The Norwegian Stroke in the Young Study. European Stroke Journal. ISSN 2396-9873. 7(3), p. 289–298. doi: 10.1177/23969873221098582. Full text in Research Archive
• Chun, Ho-Yan Yvonne; Dittrich, Tolga; Øygarden, Halvor & Li, Linxin (2022). European Stroke Organisation Conference 2021 Plenary Highlights. Stroke. ISSN 0039-2499. 53(1). doi: 10.1161/strokeaha.121.037634.
• Nawaz, Beenish; Fromm, Annette; Øygarden, Halvor; Eide, Geir E; Saeed, Sahrai & Meijer, Rudy [Show all 11 contributors for this article] (2021). Prevalence of atherosclerosis and association with 5-year outcome: The Norwegian Stroke in the Young Study. European Stroke Journal. ISSN 2396-9873. 6(4), p. 374–384. doi: 10.1177/23969873211059472. Full text in Research Archive
• Nawaz, Beenish ; Eide, Geir Egil; Fromm, Annette; Øygarden, Halvor; Sand, Kristin Modalsli & Thomassen, Lars [Show all 8 contributors for this article] (2019). Young ischaemic stroke incidence and demographic characteristics - The Norwegian stroke in the young study - A three-generation research program. European Stroke Journal. ISSN 2396-9873. 4(4), p. 347–354. doi: 10.1177/2396987319863601.
• Saeed, Sahrai; Waje-Andreassen, Ulrike; Fromm, Annette; Øygarden, Halvor; Næss, Halvor & Gerdts, Eva (2016). Prevalence and covariates of masked hypertension in ischemic stroke survivors: the Norwegian Stroke in the Young Study. Blood Pressure Monitoring. ISSN 1359-5237. 21(4), p. 244–250. doi: 10.1097/MBP.0000000000000190.
• Nacu, Aliona; Kvistad, Christopher Elnan; Næss, Halvor; Øygarden, Halvor; Logallo, Nicola & Assmus, Jörg [Show all 10 contributors for this article] (2016). NOR-SASS (Norwegian Sonothrombolysis in Acute Stroke Study): Randomized controlled contrast-enhanced sonothrombolysis in an unselected acute ischemic stroke population. Stroke. ISSN 0039-2499. 48(2), p. 335–341. doi: 10.1161/STROKEAHA.116.014644. Full text in Research Archive
• Kvistad, Christopher Elnan; Øygarden, Halvor; Logallo, Nicola; Thomassen, Lars; Waje-Andreassen, Ulrike & Moen, Gunnar [Show all 7 contributors for this article] (2016). A stress-related explanation to the increased blood pressure and its course following ischemic stroke. Vascular Health and Risk Management. ISSN 1176-6344. 12, p. 435–442. doi: 10.2147/VHRM.S109032.
• Øygarden, Halvor; Fromm, Annette; Sand, Kristin Modalsli; Kvistad, Christopher Elnan; Eide, Geir Egil & Thomassen, Lars [Show all 8 contributors for this article] (2016). A family history of stroke is associated with increased intima-media thickness in young ischemic Stroke - The norwegian stroke in the young study (NOR-SYS). PLOS ONE. ISSN 1932-6203. 11:e0159811(8). doi: 10.1371/journal.pone.0159811. Full text in Research Archive
• Saeed, Sahrai; Waje-Andreassen, Ulrike; Lønnebakken, Mai Tone; Fromm, Annette; Øygarden, Halvor & Næss, Halvor [Show all 7 contributors for this article] (2016). Covariates of non-dipping and elevated night-time blood pressure in ischemic stroke patients: the Norwegian Stroke in the Young Study. Blood Pressure. ISSN 0803-7051. 25(4), p. 212–218. doi: 10.3109/08037051.2015.1127559.
• Øygarden, Halvor; Fromm, Annette; Sand, Kristin Modalsli; Eide, Geir Egil; Thomassen, Lars & Næss, Halvor [Show all 7 contributors for this article] (2016). Can the cardiovascular family history reported by our patients be trusted? The Norwegian Stroke in the Young Study. European Journal of Neurology. ISSN 1351-5101. 23(1), p. 154–159. doi: 10.1111/ene.12824. Full text in Research Archive
• Øygarden, Halvor; Fromm, Annette; Sand, Kristin Modalsli; Eide, Geir Egil; Thomassen, Lars & Næss, Halvor [Show all 7 contributors for this article] (2015). Stroke patients' knowledge about cardiovascular family history - the Norwegian Stroke in the Young Study (NOR-SYS). BMC Neurology. ISSN 1471-2377. 15:30, p. 1–8. doi: 10.1186/s12883-015-0276-6. Full text in Research Archive
• Kvistad, Christopher Elnan; Øygarden, Halvor; Logallo, Nicola; Thomassen, Lars; Waje-Andreassen, Ulrike & Næss, Halvor (2014). Is smoking associated with favourable outcome in tPA‐treated stroke patients? Acta Neurologica Scandinavica. ISSN 0001-6314. 130(5), p. 299–304. doi: 10.1111/ane.12225.
• Kvistad, Christopher Elnan; Øygarden, Halvor; Logallo, Nicola; Moen, Gunnar; Thomassen, Lars & Waje-Andreassen, Ulrike [Show all 7 contributors for this article] (2014). A dark Side of subcortical diffusion-weighted lesions? Characteristics, cause, and outcome in large subcortical infarction: The Bergen Norwegian Stroke Cooperation Study. Stroke. ISSN 0039-2499. 45(9), p. 2710–2716. doi: 10.1161/STROKEAHA.114.005781.
• Saeed, Sahrai; Waje-Andreassen, Ulrike; Fromm, Annette; Øygarden, Halvor; Kokorina, Marina Victorovna & Næss, Halvor [Show all 7 contributors for this article] (2014). Early vascular aging in young and middle-aged ischemic stroke patients: The Norwegian stroke in the young study. PLOS ONE. ISSN 1932-6203. 9(11:e112814). doi: 10.1371/journal.pone.0112814. Full text in Research Archive
• Øygarden, Halvor; Kvistad, Christopher Elnan; Bjørk, Marte Helene; Thomassen, Lars; Waje-Andreassen, Ulrike & Næss, Halvor (2014). Diffusion-weighted lesions in acute ischaemic stroke patients with migraine. Acta Neurologica Scandinavica. ISSN 0001-6314. 129(198), p. 41–46. doi: 10.1111/ane.12236.
• Øygarden, Halvor; Kvistad, Christopher Elnan; Thomassen, Lars; Waje-Andreassen, Ulrike & Næss, Halvor (2013). Does a history of migraine affect the rate of thrombolysis in young stroke patients? Stroke Research and Treatment. ISSN 2090-8105. 2013:351064. doi: 10.1155/2013/351064. Full text in Research Archive
• Kvistad, Christopher Elnan; Logallo, Nicola; Øygarden, Halvor; Thomassen, Lars; Waje-Andreassen, Ulrike & Næss, Halvor (2013). Elevated Admission Blood Pressure and Stroke Severity in Acute Ischemic Stroke: The Bergen NORSTROKE Study. Cerebrovascular Diseases. ISSN 1015-9770. 36, p. 351–354. doi: 10.1159/000355685.
• Kvistad, Christopher Elnan; Øygarden, Halvor; Thomassen, Lars; Waje-Andreassen, Ulrike & Næss, Halvor (2013). Persistent middle cerebral artery occlusion associated with lower body temperature on admission. Vascular Health and Risk Management. ISSN 1176-6344. 9, p. 297–302. doi: 10.2147/VHRM.S44570..

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• Skisland, Anne Valen -Sendstad; Eikeland, Randi; Jeppestøl, Kristin & Øygarden, Halvor (2022). Våkn opp helseforetak, kommuner i Agder og sykepleiere. lokalavisen fedrelandsvennen.
• Øygarden, Halvor (2017). Carotid Intima‐Media Thickness and Prediction of Cardiovascular Disease. Journal of the American Heart Association (JAHA). ISSN 2047-9980. doi: 10.1161/JAHA.116.005313.
• Øygarden, Halvor & Waje-Andreassen, Ulrike (2016). Family history in young and middle-aged acute ischemic stroke patients. The Norwegian Stroke in the Young Study. Universitetet i Bergen. ISSN 978-82-308-3357-5.

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