Publications by authors named "Tveiten O"

Background: Coercion is rare in cancer treatment. We present a case where a young woman received gamma knife radiosurgery and immunochemotherapy under compulsory institutional care.

Case Presentation: A previously healthy patient in her thirties was admitted to hospital due to confusion, apathy, weight loss and sleep disturbance.

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Objective: To describe outcomes of patients with sporadic vestibular schwannoma (VS) who underwent repeat stereotactic radiosurgery (SRS) after primary SRS failure.

Study Design: Multi-institutional historical cohort study.

Setting: Five tertiary care referral centers.

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Importance: Management of sporadic vestibular schwannoma with radiosurgery is becoming increasingly common globally; however, limited data currently characterize patient outcomes in the setting of microsurgical salvage for radiosurgical failure.

Objective: To describe the clinical outcomes of salvage microsurgery following failed primary stereotactic radiosurgery (SRS) or fractionated stereotactic radiotherapy (FSRT) among patients with sporadic vestibular schwannoma.

Design, Setting, And Participants: This was a cohort study of adults (≥18 years old) with sporadic vestibular schwannoma who underwent salvage microsurgery following failed primary SRS/FSRT in 7 vestibular schwannoma treatment centers across the US and Norway.

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Objective: The objective of the current study was to present the results of an international working group survey identifying perceived limitations of existing facial nerve grading scales to inform the development of a novel grading scale for assessing early postoperative facial paralysis that incorporates regional scoring and is anchored in recovery prognosis and risk of associated complications.

Study Design: Survey.

Setting: A working group of 48 multidisciplinary clinicians with expertise in skull base, cerebellopontine angle, temporal bone, or parotid gland surgery.

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Importance: Current guidelines for treating small- to medium-sized vestibular schwannoma recommend either upfront radiosurgery or waiting to treat until tumor growth has been detected radiographically.

Objective: To determine whether upfront radiosurgery provides superior tumor volume reduction to a wait-and-scan approach for small- to medium-sized vestibular schwannoma.

Design, Setting, And Participants: Randomized clinical trial of 100 patients with a newly diagnosed (<6 months) unilateral vestibular schwannoma and a maximal tumor diameter of less than 2 cm in the cerebellopontine angle as measured on magnetic resonance imaging.

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Introduction: The success of deep brain stimulation (DBS) treatment depends on several factors, including proper patient selection, accurate electrode placement, and adequate stimulation settings. Another factor that may impact long-term satisfaction and therapy outcomes is the type of implantable pulse generator (IPG) used: rechargeable or non-rechargeable. However, there are currently no guidelines on the choice of IPG type.

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Objective: The goal of microsurgical resection of vestibular schwannoma (VS) is gross-total resection (GTR) to provide oncological cure. However, a popular strategy is to halt the resection if the surgical team feels the risk of cranial nerve injury is imminent, achieving a maximally safe subtotal resection (STR) instead. The tumor remnant can then be treated with stereotactic radiosurgery (SRS) once the patient has recovered from the immediate postoperative period, or it can be followed with serial imaging and treated with SRS in a delayed fashion if residual tumor growth is seen.

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Background: Early extensive surgery is a cornerstone in treatment of diffuse low-grade gliomas (DLGGs), and an additional survival benefit has been demonstrated from early radiochemotherapy in selected "high-risk" patients. Still, there are a number of controversies related to DLGG management. The objective of this multicenter population-based cohort study was to explore potential variations in diagnostic work-up and treatment between treating centers in 2 Scandinavian countries with similar public health care systems.

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Introduction: The optimal management of small-sized to medium-sized vestibular schwannoma (VS) is a matter of controversy. Clinical results of the prevailing treatment modalities (microsurgery, stereotactic radiosurgery (SRS), and conservative management (CM)) are documented, but comparative studies are few, and none are randomised or blinded. Upfront radiosurgery, or a careful follow-up by MRI with subsequent treatment on growth, are two strategies used at many centres.

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Importance: Checklists have been shown to improve patient outcomes in surgery. The intraoperatively used World Health Organization surgical safety checklist (WHO SSC) is now mandatory in many countries. The only evidenced checklist to address preoperative and postoperative care is the Surgical Patient Safety System (SURPASS), which has been found to be effective in improving patient outcomes.

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Background: Patients with vestibular schwannoma (VS) often complain about tiredness, exhaustion, lack of energy, and strength, but such symptoms of fatigue have scarcely been objectified and analyzed in a VS population. We aimed to characterize fatigue in a cohort of patients with VS and compare such symptoms with a control group.

Methods: All patients who attended an educational course for patients with VS were surveyed with validated tools for assessment of fatigue (fatigue severity scale), anxiety and depression (hospital anxiety and depression scale), sleepiness (Epworth sleepiness scale), and apathy (Starkstein apathy scale).

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Objectives: To ascertain primary motivation and long-term satisfaction with treatment selection in patients with vestibular schwannoma.

Methods: A multicenter, cross-sectional survey was performed. Patients with small- to medium-sized sporadic vestibular schwannoma who underwent stereotactic radiosurgery (SRS; n = 247), microsurgery (n = 144), or observation (n = 148) between 1998 and 2008 were surveyed regarding their motivation behind treatment selection and hindsight satisfaction with their choice of management.

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Background: The goal of microsurgical removal of a vestibular schwannoma is to completely remove the tumor, to provide long-term durable cure. In many cases, less than gross total resection (GTR) is performed to preserve neurological, and especially facial nerve function.

Objective: To analyze long-term quality of life (QoL) in a cohort of patients who received either GTR or less than GTR.

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Background: Studies examining patient-reported outcomes in subjects with vestibular schwannoma (VS) and "excellent" hearing are lacking.

Objective: To assess patient-reported audiovestibular handicap and overall quality of life (QoL) in VS patients with class A hearing in both ears.

Methods: Among 539 VS patients treated during 1998 to 2008, we identified 296 patients with either bilateral class A (AA) hearing or 1 good ear and 1 deaf ear (AD) according to the American Academy of Otolaryngology-Head and Neck Surgery classification.

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OBJECTIVE Patient-reported outcomes are increasingly used in studies of vestibular schwannoma (VS); however, few studies have examined self-evaluated facial nerve function and its relation to physician-reported outcomes. The primary objective of this study was to compare patient self-evaluations of facial disability with physician-evaluated facial nerve status and with self-evaluations of a healthy control group. The second objective was to provide insight into the controversial subject of the optimal initial management of small- and medium-sized VSs; consequently, the authors compared patient-reported facial nerve disability following treatment via observation (OBS), Gamma Knife surgery (GKS), or microsurgery (MS).

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Objectives/hypothesis: To evaluate outcomes of salvage surgery for vestibular schwannoma (VS) that failed primary stereotactic radiosurgery (SRS).

Methods: Case-control study of 37 patients who underwent surgical resection of sporadic VS following prior SRS at two tertiary academic referral centers between 2003 and 2015. A cohort of nonirradiated control subjects, matched according to tumor size, age, and treatment center, were used as comparison.

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Object: The primary goals of this study were: 1) to examine the influence of disease and treatment on headache in patients with sporadic vestibular schwannoma (VS); and 2) to identify clinical predictors of long-term headache disability.

Methods: This was a cross-sectional observational study with international multicenter enrollment. Patients included those with primary sporadic <3-cm VS and a separate group of general population control subjects without tumors.

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Objective: Several studies have demonstrated small but statistically significant differences in quality-of-life (QOL) scores among vestibular schwannoma (VS) treatment modalities. However, does a several-point difference on a 100-point scale really matter? The minimal clinically important difference (MCID)-defined as the smallest difference in scores that patients perceive as important and that could lead to a change in management-was developed to answer this important question. While the MCID has been determined for QOL measures used in other diseases, it remains undefined in the VS literature.

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Background: There are limited data on the long-term auditory symptoms in patients with sporadic small- and medium-sized vestibular schwannoma (VS). The initial treatment strategy for VS is controversial.

Objective: To characterize auditory symptoms in a large cohort of patients with VS.

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Object: The optimal treatment for sporadic vestibular schwannoma (VS) is highly controversial. To date, the majority of studies comparing treatment modalities have focused on a narrow scope of technical outcomes including facial function, hearing status, and tumor control. Very few publications have investigated health-related quality of life (HRQOL) differences between individual treatment groups, and none have used a disease-specific HRQOL instrument.

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Objectives/hypothesis: To investigate the influence of posttreatment audiovestibular symptoms, facial neuropathy, and headache on long-term quality-of-life outcomes in patients with sporadic vestibular schwannoma (VS) utilizing the Short Form 36 (SF-36) Health Survey and the Penn Acoustic Neuroma Quality of Life (PANQOL) scale.

Study Design: Cross-sectional observation study.

Methods: Patients with sporadic small- or medium-sized VS (< 3.

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Objective: (1) To characterize long-term dizziness following observation, microsurgery, and stereotactic radiosurgery (SRS) for small to medium-sized vestibular schwannoma (VS) using a validated self-assessment inventory; and (2) to identify clinical variables associated with long-term dizziness handicap.

Study Design: Cross-sectional observational study.

Setting: Two independent tertiary academic referral centers: one located in the United States and one in Norway.

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Objectives: There are limited data on treatment effect in early and drug-naïve Parkinson's disease (PD) outside of clinical trials. We sought to review the treatment effects on motor symptoms in early, unselected PD patients.

Methods: We included 183 drug-naïve patients from a longitudinal cohort (The Norwegian ParkWest study).

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Between 16 September and 5 October 2011 rabies was diagnosed in two arctic foxes and eight reindeer in the Svalbard archipelago, in Norway. This outbreak occurs at the end of the reindeer hunting season and poses an increased risk to many people that were involved in the hunt. As of 28 September 2011, 280 people had received post-exposure prophylaxis.

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Research has shown great variety in the clinical practice of consultation-liaison psychiatry in and between different countries. This paper presents the Norwegian experiences from a European collaborative study of quality management in consultation-liaison psychiatry. We describe a dynamic model for total quality management based on regular registration of some clinical data and the subsequent feed-back on changes of these.

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