| 1. |
- Stacey, Simon N, et al.
(author)
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A germline variant in the TP53 polyadenylation signal confers cancer susceptibility.
- 2011
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In: Nature Genetics. - : Springer Science and Business Media LLC. - 1061-4036 .- 1546-1718. ; 43:11, s. 1098-103
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Journal article (peer-reviewed)abstract
- To identify new risk variants for cutaneous basal cell carcinoma, we performed a genome-wide association study of 16 million SNPs identified through whole-genome sequencing of 457 Icelanders. We imputed genotypes for 41,675 Illumina SNP chip-typed Icelanders and their relatives. In the discovery phase, the strongest signal came from rs78378222[C] (odds ratio (OR) = 2.36, P = 5.2 × 10(-17)), which has a frequency of 0.0192 in the Icelandic population. We then confirmed this association in non-Icelandic samples (OR = 1.75, P = 0.0060; overall OR = 2.16, P = 2.2 × 10(-20)). rs78378222 is in the 3' untranslated region of TP53 and changes the AATAAA polyadenylation signal to AATACA, resulting in impaired 3'-end processing of TP53 mRNA. Investigation of other tumor types identified associations of this SNP with prostate cancer (OR = 1.44, P = 2.4 × 10(-6)), glioma (OR = 2.35, P = 1.0 × 10(-5)) and colorectal adenoma (OR = 1.39, P = 1.6 × 10(-4)). However, we observed no effect for breast cancer, a common Li-Fraumeni syndrome tumor (OR = 1.06, P = 0.57, 95% confidence interval 0.88-1.27).
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| 2. |
- Hilmarsdóttir, Bylgja, et al.
(author)
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MicroRNA-200c-141 and ∆Np63 are required for breast epithelial differentiation and branching morphogenesis.
- 2015
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In: Developmental Biology. - : Elsevier BV. - 1095-564X .- 0012-1606. ; 403:2, s. 150-161
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Journal article (peer-reviewed)abstract
- The epithelial compartment of the breast contains two lineages, the luminal- and the myoepithelial cells. D492 is a breast epithelial cell line with stem cell properties that forms branching epithelial structures in 3D culture with both luminal- and myoepithelial differentiation. We have recently shown that D492 undergo epithelial to mesenchymal transition (EMT) when co-cultured with endothelial cells. This 3D co-culture model allows critical analysis of breast epithelial lineage development and EMT. In this study, we compared the microRNA (miR) expression profiles for D492 and its mesenchymal-derivative D492M. Suppression of the miR-200 family in D492M was among the most profound changes observed. Exogenous expression of miR-200c-141 in D492M reversed the EMT phenotype resulting in gain of luminal but not myoepithelial differentiation. In contrast, forced expression of ∆Np63 in D492M restored the myoepithelial phenotype only. Co-expression of miR-200c-141 and ∆Np63 in D492M restored the branching morphogenesis in 3D culture underlining the requirement for both luminal and myoepithelial elements for obtaining full branching morphogenesis in breast epithelium. Introduction of a miR-200c-141 construct in both D492 and D492M resulted in resistance to endothelial induced EMT. In conclusion, our data suggests that expression of miR-200c-141 and ∆Np63 in D492M can reverse EMT resulting in luminal- and myoepithelial differentiation, respectively, demonstrating the importance of these molecules in epithelial integrity in the human breast.
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| 3. |
- Amundadottir, Laufey T., et al.
(author)
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A common variant associated with prostate cancer in European and African populations
- 2006
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In: Nature Genetics. - DeCODE Genet, IS-101 Reykjavik, Iceland. Univ Iceland, Landspitali Hosp, Dept Pathol, IS-101 Reykjavik, Iceland. Univ Iceland, Landspitali Hosp, Dept Urol, IS-101 Reykjavik, Iceland. Univ Michigan, Dept Human Genet, Ann Arbor, MI 48109 USA. Orebro Univ Hosp, Dept Urol & Clin Med, Orebro, Sweden. Karolinska Inst, Dept Med Epidemiol & Biostat, SE-17177 Stockholm, Sweden. Univ Michigan, Dept Urol, Ann Arbor, MI 48109 USA. Northwestern Univ, Feinberg Sch Med, Dept Urol, Chicago, IL 60611 USA. Washington Univ, Sch Med, Dept Psychiat, St Louis, MO 63110 USA. Univ Chicago, Dept Human Genet, Chicago, IL 60637 USA. Univ Michigan, Dept Internal Med, Ann Arbor, MI 48109 USA. : Springer Science and Business Media LLC. - 1061-4036 .- 1546-1718. ; 38:6, s. 652-658
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Journal article (peer-reviewed)abstract
- With the increasing incidence of prostate cancer, identifying common genetic variants that confer risk of the disease is important. Here we report such a variant on chromosome 8q24, a region initially identified through a study of Icelandic families. Allele -8 of the microsatellite DG8S737 was associated with prostate cancer in three case-control series of European ancestry from Iceland, Sweden and the US. The estimated odds ratio (OR) of the allele is 1.62 (P = 2.7 x 10(-11)). About 19% of affected men and 13% of the general population carry at least one copy, yielding a population attributable risk (PAR) of approximately 8%. The association was also replicated in an African American case-control group with a similar OR, in which 41% of affected individuals and 30% of the population are carriers. This leads to a greater estimated PAR (16%) that may contribute to higher incidence of prostate cancer in African American men than in men of European ancestry.
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| 4. |
- Aslam, Tayyba N., et al.
(author)
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A survey of preferences for respiratory support in the intensive care unit for patients with acute hypoxaemic respiratory failure
- 2023
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In: Acta Anaesthesiologica Scandinavica. - : WILEY. - 0001-5172 .- 1399-6576. ; 67:10, s. 1383-1394
-
Journal article (peer-reviewed)abstract
- BackgroundWhen caring for mechanically ventilated adults with acute hypoxaemic respiratory failure (AHRF), clinicians are faced with an uncertain choice between ventilator modes allowing for spontaneous breaths or ventilation fully controlled by the ventilator. The preferences of clinicians managing such patients, and what motivates their choice of ventilator mode, are largely unknown. To better understand how clinicians preferences may impact the choice of ventilatory support for patients with AHRF, we issued a survey to an international network of intensive care unit (ICU) researchers.MethodsWe distributed an online survey with 32 broadly similar and interlinked questions on how clinicians prioritise spontaneous or controlled ventilation in invasively ventilated patients with AHRF of different severity, and which factors determine their choice.ResultsThe survey was distributed to 1337 recipients in 12 countries. Of these, 415 (31%) completed the survey either fully (52%) or partially (48%). Most respondents were identified as medical specialists (87%) or physicians in training (11%). Modes allowing for spontaneous ventilation were considered preferable in mild AHRF, with controlled ventilation considered as progressively more important in moderate and severe AHRF. Among respondents there was strong support (90%) for a randomised clinical trial comparing spontaneous with controlled ventilation in patients with moderate AHRF.ConclusionsThe responses from this international survey suggest that there is clinical equipoise for the preferred ventilator mode in patients with AHRF of moderate severity. We found strong support for a randomised trial comparing modes of ventilation in patients with moderate AHRF.
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| 5. |
- Bjornsdottir, Erla, et al.
(author)
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Quality of life among untreated sleep apnea patients compared with the general population and changes after treatment with positive airway pressure
- 2015
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In: Journal of Sleep Research. - : Wiley. - 0962-1105 .- 1365-2869. ; 24:3, s. 328-338
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Journal article (peer-reviewed)abstract
- Obstructive sleep apnea leads to recurrent arousals from sleep, oxygen desaturations, daytime sleepiness and fatigue. This can have an adverse impact on quality of life. The aims of this study were to compare: (i) quality of life between the general population and untreated patients with obstructive sleep apnea; and (ii) changes of quality of life among patients with obstructive sleep apnea after 2 years of positive airway pressure treatment between adherent patients and non-users. Propensity score methodologies were used in order to minimize selection bias and strengthen causal inferences. The enrolled obstructive sleep apnea subjects (n = 822) were newly diagnosed with moderate to severe obstructive sleep apnea who were starting positive airway pressure treatment, and the general population subjects (n = 742) were randomly selected Icelanders. The Short Form 12 was used to measure quality of life. Untreated patients with obstructive sleep apnea had a worse quality of life when compared with the general population. This effect remained significant after using propensity scores to select samples, balanced with regard to age, body mass index, gender, smoking, diabetes, hypertension and cardiovascular disease. We did not find significant overall differences between full and non-users of positive airway pressure in improvement of quality of life from baseline to follow-up. However, there was a trend towards more improvement in physical quality of life for positive airway pressure-adherent patients, and the most obese subjects improved their physical quality of life more. The results suggest that co-morbidities of obstructive sleep apnea, such as obesity, insomnia and daytime sleepiness, have a great effect on life qualities and need to be taken into account and addressed with additional interventions.
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| 6. |
- Bjornsdottir, Erla, et al.
(author)
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Symptoms of Insomnia among Patients with Obstructive Sleep Apnea Before and After Two Years of Positive Airway Pressure Treatment
- 2013
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In: Sleep. - : Oxford University Press (OUP). - 0161-8105 .- 1550-9109. ; 36:12, s. 1901-1909
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Journal article (peer-reviewed)abstract
- Study Objectives: To assess the changes of insomnia symptoms among patients with obstructive sleep apnea (OSA) from starting treatment with positive airway pressure (PAP) to a 2-y follow-up. Design: Longitudinal cohort study. Setting: Landspitali-The National University Hospital of Iceland. Participants: There were 705 adults with OSA who were assessed prior to and 2 y after starting PAP treatment. Intervention: PAP treatment for OSA. Measurements and Results: All patients underwent a medical examination along with a type 3 sleep study and answered questionnaires on health and sleep before and 2 y after starting PAP treatment. The change in prevalence of insomnia symptoms by subtype was assessed by questionnaire and compared between individuals who were using or not using PAP at follow-up. Symptoms of middle insomnia were most common at baseline and improved significantly among patients using PAP (from 59.4% to 30.7%, P < 0.001). Symptoms of initial insomnia tended to persist regardless of PAP treatment, and symptoms of late insomnia were more likely to improve among patients not using PAP. Patients with symptoms of initial and late insomnia at baseline were less likely to adhere to PAP (odds ratio [OR] 0.56, P = 0.007, and OR 0.53, P < 0.001, respectively). Conclusion: Positive airway pressure treatment significantly reduced symptoms of middle insomnia. Symptoms of initial and late insomnia, however, tended to persist regardless of positive airway pressure treatment and had a negative effect on adherence. Targeted treatment for insomnia may be beneficial for patients with obstructive sleep apnea comorbid with insomnia and has the potential to positively affect adherence to positive airway pressure.
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| 7. |
- Björnsdóttir, Erla, et al.
(author)
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Insomnia in untreated sleep apnea patients compared to controls
- 2012
-
In: Journal of Sleep Research. - : Wiley. - 0962-1105 .- 1365-2869. ; 21:2, s. 131-138
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Journal article (peer-reviewed)abstract
- Insomnia and obstructive sleep apnea (OSA) often coexist, but the nature of their relationship is unclear. The aims of this study were to compare the prevalence of initial and middle insomnia between OSA patients and controls from the general population as well as to study the influence of insomnia on sleepiness and quality of life in OSA patients. Two groups were compared, untreated OSA patients (n = 824) and controls ≥ 40 years from the general population in Iceland (n = 762). All subjects answered the same questionnaires on health and sleep and OSA patients underwent a sleep study. Altogether, 53% of controls were males compared to 81% of OSA patients. Difficulties maintaining sleep (DMS) were more common among men and women with OSA compared to the general population (52 versus 31% and 62 versus 31%, respectively, P < 0.0001). Difficulties initiating sleep (DIS) and DIS + DMS were more common among women with OSA compared to women without OSA. OSA patients with DMS were sleepier than patients without DMS (Epworth Sleepiness Scale: 12.2 versus 10.9, P < 0.001), while both DMS and DIS were related to lower quality of life in OSA patients as measured by the Short Form 12 (physical score 39 versus 42 and mental score 36 versus 41, P < 0.001). DIS and DMS were not related to OSA severity. Insomnia is common among OSA patients and has a negative influence on quality of life and sleepiness in this patient group. It is relevant to screen for insomnia among OSA patients and treat both conditions when they co-occur.
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| 8. |
- Chew, Michelle, et al.
(author)
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A descriptive study of the surge response and outcomes of ICU patients with COVID-19 during first wave in Nordic countries
- 2022
-
In: Acta Anaesthesiologica Scandinavica. - : WILEY. - 0001-5172 .- 1399-6576. ; 66:1, s. 56-64
-
Journal article (peer-reviewed)abstract
- Background We sought to provide a description of surge response strategies and characteristics, clinical management and outcomes of patients with severe COVID-19 in the intensive care unit (ICU) during the first wave of the pandemic in Denmark, Finland, Iceland, Norway and Sweden. Methods Representatives from the national ICU registries for each of the five countries provided clinical data and a description of the strategies to allocate ICU resources and increase the ICU capacity during the pandemic. All adult patients admitted to the ICU for COVID-19 disease during the first wave of COVID-19 were included. The clinical characteristics, ICU management and outcomes of individual countries were described with descriptive statistics. Results Most countries more than doubled their ICU capacity during the pandemic. For patients positive for SARS-CoV-2, the ratio of requiring ICU admission for COVID-19 varied substantially (1.6%-6.7%). Apart from age (proportion of patients aged 65 years or over between 29% and 62%), baseline characteristics, chronic comorbidity burden and acute presentations of COVID-19 disease were similar among the five countries. While utilization of invasive mechanical ventilation was high (59%-85%) in all countries, the proportion of patients receiving renal replacement therapy (7%-26%) and various experimental therapies for COVID-19 disease varied substantially (e.g. use of hydroxychloroquine 0%-85%). Crude ICU mortality ranged from 11% to 33%. Conclusion There was substantial variability in the critical care response in Nordic ICUs to the first wave of COVID-19 pandemic, including usage of experimental medications. While ICU mortality was low in all countries, the observed variability warrants further attention.
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| 9. |
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| 10. |
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| 11. |
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| 12. |
- Hansson, Martin, et al.
(author)
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Building Glory : Elite Palaces in Early and High Medieval Scandinavia
- 2020
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In: Nordic Elites in Transformation, c. 1050–1250, Volume III : Legitimacy and Glory - Legitimacy and Glory. - New York, NY : Routledge, 2019– | Series: Routledge research in medieval studies ; 14 : Routledge. - 9781003097143 ; III
-
Book chapter (peer-reviewed)abstract
- Buildings such as castles and palaces were of utmost importance for the display of social rank and the production of legitimacy for the Scandinavian elites. The palace could be a specific building inside a castle, integrated into a fortified structure, or unfortified. This chapter discusses how the Scandinavian elite during the Early and High Middle Ages used buildings and locations in the landscape to enhance and confirm social identity and power. The unfortified royal palaces in Dalby, Alsnö and Vadstena in present-day Sweden are in focus. Within the exclusive and excluding space of these structures, kings, queens, nobles and aristocratic retainers would find their elevated status, lifestyle and rule articulated and justified. The palaces introduced new architectural features and building materials, but also capitalized on history and past glory. Through their architectural features, building material and location in the landscape, they dominated their physical surroundings like their residents dominated society.
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| 13. |
- Jezierski, Wojtek, 1979, et al.
(author)
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Editors’ Preface
- 2021
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In: Wojtek Jezierski, Kim Esmark, Hans Jacob Orning, Jón Viðar Sigurðsson, Nordic Elites in Transformation, c. 1050-1250 Vol. III: Legitimacy and Glory. - New York : Routledge. - 9780367562816
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Book chapter (other academic/artistic)
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| 14. |
- Jonsdottir, Sigridur Sia, et al.
(author)
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Pain management and medical interventions during childbirth among perinatal distressed women and women dissatisfied in their partner relationship : A prospective cohort study
- 2019
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In: Midwifery. - : Elsevier. - 0266-6138 .- 1532-3099. ; 69, s. 1-9
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Journal article (peer-reviewed)abstract
- Objective: The purpose of this study was to investigate possible associations between distress in pregnant women and their use of pain management and medical interventions. Furthermore, we assessed the effects of reported dissatisfaction in relationship with their partner, or weak social support. Design: This was a prospective cohort study. Setting: Women were invited to participate while attending prenatal care at participating Icelandic health care centres. Birth outcome data were obtained from the hospitals where these women gave birth. Participants: Women in this study participated in a research project where 2523 women were screened three times during pregnancy for anxiety and depression. Women who had positive results at screening were invited to a semi-structured interview during pregnancy as well as every fourth woman who had negative results. Five hundred and sixty-two women participated in the interviews and the final sample was 442 women. Measurements: Distress was defined as symptoms of anxiety, stress and depression. The Edinburgh Post-partum Depression Scale (EPDS) and the Depression, Anxiety and Stress Scales (DASS) were used for screening purposes. During the interview, the women answered the Dyadic Adjustment Scale (DAS), the Multidimensional Scale of Perceived Social Support (MSPSS), and the Adverse Experienced Interview (AEI). The main outcome variables that were obtained from the women's childbirth records were: (1) use of pain management, categorized as: epidural analgesia, non-pharmacological pain management, nitrous oxide, pharmacological medication, or no pain management; (2) medical interventions categorized as: induction, stimulation, and episiotomy; and (3) mode of childbirth. A logistic regression analysis, adjusted for significant covariates, was conducted. Findings: A significant association was found between perinatal distress at 16 weeks gestation and use of epidural as single pain management. Overall, distressed women were 2.6 times more likely than non-distressed women to use epidural as a single pain management. They were also less likely to go through childbirth without use of any pain management method. Women who were dissatisfied in their relationship were significantly more likely to undergo induction of childbirth, an episiotomy and/or a vacuum extraction than those who were satisfied in their relationship, regardless if they were distressed or not. No association was found between social support and the outcome variables. Key conclusions: Women with perinatal distress were more likely to use an epidural than non-distressed women. The use of an epidural might help them manage pain and uncertainties related to childbirth. Women who were dissatisfied in their partner relationship may be more likely to undergo induction of childbirth, episiotomy and/or vacuum extraction. Implication for practice: Midwives need to acknowledge the possible association of distress and use of an epidural during childbirth and screen for distress early in pregnancy. It is important to offer counselling and help during pregnancy for expectant parents who are distressed or dissatisfied in their relationship. (C) 2018 Elsevier Ltd. All rights reserved.
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| 15. |
- Jonsdottir, Sigridur Sia, et al.
(author)
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Partner relationship, social support and perinatal distress among pregnant Icelandic women
- 2017
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In: Women and Birth. - : Elsevier. - 1871-5192 .- 1878-1799. ; 30:1, s. e46-e55
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Journal article (peer-reviewed)abstract
- BACKGROUND: It is inferred that perinatal distress has adverse effects on the prospective mother and the health of the foetus/infant. More knowledge is needed to identify which symptoms of perinatal distress should be assessed during pregnancy and to shed light on the impact of women's satisfaction with their partner relationship on perinatal distress.AIM: The current study aimed to generate knowledge about the association of the partner relationship and social support when women are dealing with perinatal distress expressed by symptoms of depression, anxiety and stress.METHODS: A structured interview was conducted with 562 Icelandic women who were screened three times during pregnancy with the Edinburgh Depression Scale and the Depression, Anxiety, Stress Scale. Of these, 360 had symptoms of distress and 202 belonged to a non-distress group. The women answered the Multidimensional Scale of Perceived Social Support and the Dyadic Adjustment Scale. The study had a multicentre prospective design allowing for exploration of association with perinatal distress.FINDINGS: Women who were dissatisfied in their partner relationship were four times more likely to experience perinatal distress. Women with perinatal distress scored highest on the DASS Stress Subscale and the second highest scores were found on the Anxiety Subscale.CONCLUSION: Satisfaction in partner relationship is related to perinatal distress and needs to be assessed when health care professionals take care of distressed pregnant women, her partner and her family. Assessment of stress and anxiety should be included in the evaluation of perinatal distress, along with symptoms of depression.
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| 16. |
- Jonsdottir, Sigridur Sia, et al.
(author)
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Pregnancy complications, sick leave and service needs of women who experience perinatal distress, weak social support and dissatisfaction in their partner relationships
- 2020
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In: Scandinavian Journal of Caring Sciences. - : John Wiley & Sons. - 0283-9318 .- 1471-6712. ; 34:1, s. 167-180
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Journal article (peer-reviewed)abstract
- Introduction Although perinatal distress is acknowledged as a burdening condition for pregnant women, its effects on pregnancy are not well known. This study was conducted to increase knowledge regarding the effects of distress on pregnancy-related problems. The study also assessed women's need for sick leave and increased prenatal care due to distress, and the effects of weak social support and dissatisfaction with their partner relationships. Methods In total, 2523 women were screened for perinatal distress three times during pregnancy in this quantitative cohort study. Structured psychiatric interviews were conducted following the screening, with 562 of the participants. Data from participants' pregnancy records were also analysed. The study was conducted in primary healthcare centres in Iceland after receiving approval from the Icelandic National Bioethical Committee. The main outcome measures were pregnancy problems, sick leave issued and prenatal service needs. Results Data from 503 women were analysed. The perinatal distress group (PDG) was significantly more likely than was the nondistressed group (NDG) to experience fatigue, vomiting and pelvic pain after controlling for background variables. Distressed women who reported weak family support experienced symptoms of nausea and heartburn. The PDG needed more frequent prenatal care than did the NDG and was issued sick leave for up to 42 days longer. Dissatisfaction in the partner relationship and with the division of household tasks and childcare was strongly associated with distress, the development of complications and the need for sick leave. Discussion Identification of perinatal distress by midwives and other healthcare professionals is important, since distress may be linked to women's complaints of fatigue, vomiting, pelvic pain and need for prolonged sick leave, and additional prenatal care services will be needed. Perceived dissatisfaction in the partner relationship and with the division of household tasks should also form part of clinical practice and assistance provided.
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| 17. |
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| 18. |
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| 19. |
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| 20. |
- Kristiansson, Moa K., 1989-, et al.
(author)
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High-precision electron affinity of oxygen
- 2022
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In: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 13:1
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Journal article (peer-reviewed)abstract
- Negative ions are important in many areas of science and technology, e.g., in interstellar chemistry, for accelerator-based radionuclide dating, and in anti-matter research. They are unique quantum systems where electron-correlation effects govern their properties. Atomic anions are loosely bound systems, which with very few exceptions lack optically allowed transitions. This limits prospects for high-resolution spectroscopy, and related negative-ion detection methods. Here, we present a method to measure negative ion binding energies with an order of magnitude higher precision than what has been possible before. By laser-manipulation of quantum-state populations, we are able to strongly reduce the background from photodetachment of excited states using a cryogenic electrostatic ion-beam storage ring where keV ion beams can circulate for up to hours. The method is applicable to negative ions in general and here we report an electron affinity of 1.461 112 972(87) eV for O-16. High-precision measurements are useful to find isotopic shifts and electron correlation. Here the authors measure electron affinity and hyperfine splitting of atomic oxygen with higher precision than previous studies.
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| 21. |
- Löfqvist, Chatarina, 1964, et al.
(author)
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Longitudinal Postnatal Weight and Insulin-like Growth Factor I Measurements in the Prediction of Retinopathy of Prematurity
- 2006
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In: Arch Ophthalmol. - : American Medical Association (AMA). ; 124:12, s. 1711-1718
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Journal article (peer-reviewed)abstract
- Objective To investigate whether postnatal growth and development influence retinopathy of prematurity (ROP) and may be included in screening for ROP. Design We developed an algorithm to predict for individual infants the risk of later ROP development requiring treatment based on the postnatal longitudinal systemic factors of insulin-like growth factor I (IGF-I) level, IGF binding protein 3 level, and postnatal weight gain. We developed the algorithm based on 79 preterm infants considered at risk for ROP by standard criteria (gestational age, 23.6-31.7 weeks) in a longitudinal study measuring weight gain and serum IGF-I and IGF binding protein 3 levels weekly from birth until discharge from the hospital. We monitored deviations from reference models for weight and IGF-I level (preterm children who developed no or minimal ROP) to detect indications for treatable ROP by Early Treatment for Retinopathy of Prematurity study criteria. Results This monitoring method detected 6 (100%) of 6 infants in this cohort who required treatment for ROP with a warning signal at least 5 weeks before requiring treatment and at least 3 weeks before the onset of stage 3 ROP. The majority of infants (61/73 infants) requiring no treatment were also correctly identified. Conclusions Monitoring the postnatal factors of weight, IGF-I level, and IGF binding protein 3 level substantially enhances the clinician's ability to identify patients who will require treatment for ROP.
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| 22. |
- Löfqvist, Chatarina, 1964, et al.
(author)
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Postnatal head growth deficit among premature infants parallels retinopathy of prematurity and insulin-like growth factor-1 deficit
- 2006
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In: Pediatrics. ; 117:6, s. 1930-8
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Journal article (peer-reviewed)abstract
- BACKGROUND: We hypothesized that in premature infants, retinal vascular growth retardation between birth and postmenstrual age of approximately 30 to 32 weeks that initiates retinopathy of prematurity is paralleled by brain growth retardation. METHODS: In a prospective longitudinal study, we measured postnatal head growth, retinopathy of prematurity stage, protein and energy intake, severity of illness and serum insulin-like growth factor-1 levels in 58 preterm infants (mean gestational age at birth: 27.6 weeks) from birth until postmenstrual age of approximately 40 weeks. RESULTS: Premature infant head growth decelerates dramatically after birth until postmenstrual age of approximately 30 weeks. Head growth retardation coincides with retinal vascular growth suppression. Accelerated growth follows between post menstrual ages of approximately 30 to 32 weeks and approximately 40 weeks. The degree of head growth retardation up to postmenstrual age of 31 weeks corresponds to the degree of retinopathy of prematurity and to the degree of suppression of serum levels of insulin-like growth factor-1. At postmenstrual age of 31 weeks, if a child's head circumference SD is below -2.5, then the probability of also developing at least stage 3 retinopathy of prematurity increases fivefold compared with head circumference above -2.5 SD (32% vs 6%) suggesting parallel processes in brain and retina. Serum insulin-like growth factor-1 levels correlate positively with head circumference SD score and with the degree of retinopathy of prematurity. CONCLUSIONS: The correlation between head and retinal growth is consistent with insulin growth factor-1 being one of the postnatal growth factors involved in this multifactorial process and also suggests that factors that contribute to retinopathy of prematurity during this critical period may also affect neurological dysfunction. Additional studies are required to establish this connection.
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| 23. |
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| 24. |
- Löve, Arthur, et al.
(author)
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Characteristics of hepatitis C virus among intravenous drug users in Iceland
- 1996
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In: American Journal of Epidemiology. - 0002-9262. ; 143:6, s. 631-636
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Journal article (peer-reviewed)abstract
- According to antibody analysis, approximately two of every three intravenous drug users in Iceland have become infected with hepatitis C virus (HCV). In this study, serum samples from 55 HCV antibody-positive intravenous drug users (39 males and 16 females) were analyzed by polymerase chain reaction, and the viral strains were grouped into genotypes. Only three genotypes--1a, 3a, and 1b--were found among the drug users. Of 40 persons who were positive by polymerase chain reaction, 23 (57.5%) had type 1a, 15 (37.5%) had type 3a, and one (2.5%) had type 1b. One serum sample was untypeable. HCV viral RNA was detectable in 84.6% of the males and 43.7% of the females, which is a significant difference between the sexes (p < 0.01). In addition, 41 randomly selected HCV antibody-positive intravenous drug users (17 males and 24 females) were tested for HCV viral RNA with a commercially available polymerase chain reaction technique. In this subset of drug users, 76.4% of the males and 33.3% of the females had detectable HCV RNA in their serum, which is also a significant sex difference (p < 0.01). This study shows that two HCV genotypes predominate among intravenous drug users in Iceland, and the results indicate that women eliminate virus more effectively than men.
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| 25. |
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Nordic Elites in Transformation, c. 1050-1250. Volume III, Legitimacy and Glory
- 2021
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In: Wojtek Jezierski, Kim Esmark, Hans Jacob Orning, Jón Viðar Sigurðsson (eds.), Nordic Elites in Transformation, c. 1050-1250 Vol. III: Legitimacy and Glory. - New York : Routledge. - 9780367562816 ; , s. 1-35
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Editorial collection (other academic/artistic)abstract
- This book explores the practical and symbolic resources of legitimacy which the elites of medieval Scandinavia employed to establish, justify, and reproduce their social and political standing between the end of the Viking Age and the rise of kingdoms in the thirteenth century. Geographically the chapters cover the Scandinavian realms and Free State Iceland. Thematically the authors cover a wide palette of cultural practices and historical sources: hagiography, historiography, spaces and palaces, literature, and international connections, which rulers, magnates or ecclesiastics used to compete for status and to reserve haloing glory for themselves. The volume is divided in three sections. The first looks at the sacral, legal, and acclamatory means through which privilege was conferred onto kings and ruling families. Section Two explores the spaces such as aristocratic halls, palaces, churches in which the social elevation of elites took place. Section Three explores the traditional and novel means of domestic distinction and international cultural capital which different orders of elites – knights, powerful clerics, ruling families etc. – wrought to assure their dominance and set themselves apart vis-à-vis their peers and subjects. A concluding chapter discusses how the use of symbolic capital in the North compared to wider European contexts.
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| 26. |
- Olafsdottir, Elinborg J., et al.
(author)
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Breast cancer survival in Nordic BRCA2 mutation carriers—unconventional association with oestrogen receptor status
- 2020
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In: British Journal of Cancer. - : Springer Science and Business Media LLC. - 0007-0920 .- 1532-1827. ; 123:11, s. 1608-1615
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Journal article (peer-reviewed)abstract
- Background: The natural history of breast cancer among BRCA2 carriers has not been clearly established. In a previous study from Iceland, positive ER status was a negative prognostic factor. We sought to identify factors that predicted survival after invasive breast cancer in an expanded cohort of BRCA2 carriers. Methods: We studied 608 women with invasive breast cancer and a pathogenic BRCA2 mutation (variant) from four Nordic countries. Information on prognostic factors and treatment was retrieved from health records and by analysis of archived tissue specimens. Hazard ratios (HR) were estimated for breast cancer-specific survival using Cox regression. Results: About 77% of cancers were ER-positive, with the highest proportion (83%) in patients under 40 years. ER-positive breast cancers were more likely to be node-positive (59%) than ER-negative cancers (34%) (P < 0.001). The survival analysis included 584 patients. Positive ER status was protective in the first 5 years from diagnosis (multivariate HR = 0.49; 95% CI 0.26–0.93, P = 0.03); thereafter, the effect was adverse (HR = 1.91; 95% CI 1.07–3.39, P = 0.03). The adverse effect of positive ER status was limited to women who did not undergo endocrine treatment (HR = 2.36; 95% CI 1.26–4.44, P = 0.01) and patients with intact ovaries (HR = 1.99; 95% CI 1.11–3.59, P = 0.02). Conclusions: The adverse effect of a positive ER status in BRCA2 carriers with breast cancer may be contingent on exposure to ovarian hormones.
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| 27. |
- Pfeffer, W. Tad, et al.
(author)
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The Randolph Glacier Inventory : a globally complete inventory of glaciers
- 2014
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In: Journal of Glaciology. - 0022-1430 .- 1727-5652. ; 60:221, s. 537-552
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Journal article (peer-reviewed)abstract
- The Randolph Glacier Inventory (RGI) is a globally complete collection of digital outlines of glaciers, excluding the ice sheets, developed to meet the needs of the Fifth Assessment of the Intergovernmental Panel on Climate Change for estimates of past and future mass balance. The RGI was created with limited resources in a short period. Priority was given to completeness of coverage, but a limited, uniform set of attributes is attached to each of the similar to 198 000 glaciers in its latest version, 3.2. Satellite imagery from 1999-2010 provided most of the outlines. Their total extent is estimated as 726 800 +/- 34 000 km(2). The uncertainty, about +/- 5%, is derived from careful single-glacier and basin-scale uncertainty estimates and comparisons with inventories that were not sources for the RGI. The main contributors to uncertainty are probably misinterpretation of seasonal snow cover and debris cover. These errors appear not to be normally distributed, and quantifying them reliably is an unsolved problem. Combined with digital elevation models, the RGI glacier outlines yield hypsometries that can be combined with atmospheric data or model outputs for analysis of the impacts of climatic change on glaciers. The RGI has already proved its value in the generation of significantly improved aggregate estimates of glacier mass changes and total volume, and thus actual and potential contributions to sea-level rise.
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| 28. |
- Sigurdsson, H. B., et al.
(author)
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Kinematics observed during ACL injury are associated with large early peak knee abduction moments during a change of direction task in healthy adolescents
- 2021
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In: Journal of Orthopaedic Research. - : Wiley. - 0736-0266 .- 1554-527X. ; 39:10, s. 2281-2290
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Journal article (peer-reviewed)abstract
- Cluster analysis of knee abduction moment waveforms may be useful to examine biomechanical data. The aim of this study was to analyze if the knee abduction moment waveform of early peaks, consistent with anterior cruciate ligament injury mechanisms, was associated with foot-trunk distance, knee kinematics, and heel strike landing posture, all of which have been observed during anterior cruciate ligament injuries. One hundred and seventy-seven adolescent athletes performed cutting maneuvers, marker-based motion capture collected kinetic and marker data and an 8-segment musculoskeletal model was constructed. Knee abduction moment waveforms were clustered as either a large early peak, or not a large early peak using a two-step process with Euclidean distances and the Ward-d2 cluster method. Mediolateral distance between foot and trunk was associated with the large early peak waveform with an odds ratio (95% confidence interval) of 3.4 (2.7-4.4). Knee flexion angle at initial contact and knee flexion excursion had odds ratios of 1.9 (1.6-2.4) and 1.6 (1.3-2.0). Knee abduction excursions had an odds ratio of 1.8 (1.1-2.4) and 1.8 (1.4-2.4), respectively. Heel strike landings and anteroposterior distance between foot and trunk were not associated with the large early peak waveform with odds ratios of 1.2 (0.9-1.7) and 1.1 (0.8-1.3), respectively. The knee abduction moment waveform is associated with several kinematic variables observed during ACL injury. The results support intervention programs that can modify these kinematics and thus reduce early stance phase knee abduction moments.
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| 29. |
- Sigurðsson, Jón Viðar, et al.
(author)
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Introduction
- 2013
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In: Friendship and Social Networks in Scandinavia c. 1000-1800. - : Brepols. - 9782503542485 - 9782503542607 ; , s. 1-14
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Book chapter (other academic/artistic)
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| 30. |
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| 31. |
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| 32. |
- Stigson, Lennart, et al.
(author)
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Bone and fat mass in relation to postnatal levels of insulin-like growth factors in prematurely born children at 4y of age
- 2014
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In: Pediatric Research. - : Nature Publishing Group: Open Access Hybrid Model Option A. - 0031-3998 .- 1530-0447. ; 75:4, s. 544-550
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Journal article (peer-reviewed)abstract
- BACKGROUND: Children born prematurely may be at risk of developing osteopenia. This study investigated whether insulin-like growth factors (IGFs) in the early postnatal period influence bone mass and body composition in prematurely born children. METHODS: A total of 74 control (gestational age greater than36 wk; n = 37) and preterm (gestational age less than32 wk; n = 37) infants were investigated (mean age +/- SD: 4.59 +/- 0.31 y). Bone mineral density, body composition, and markers of bone and mineral metabolism were investigated in relation to postnatal IGF levels. RESULTS: After adjusting for confounders, we found no differences in bone mass, but significantly less lean mass, increased fat mass, and increased osteocalcin levels in ex-preterm infants. Forward stepwise multiple analysis revealed that higher late postnatal IGF-II levels predict lumbar spine bone mineral content (P less than 0.05) and lean mass (P less than 0.05). When the birth weight standard deviation score was included in the analysis, higher early postnatal IGF-I levels predicted both lumbar spine bone mineral density and bone mineral content (P less than 0.05). Higher early postnatal IGF binding protein-3 (P less than 0.01) predicted increased fat mass at 4-y follow-up. CONCLUSION: Ex-preterm children have normal bone mass but different body composition compared with full-term controls. Higher early IGF-I and late postnatal IGF-II concentrations are positive predictors of lumbar spine bone mass.
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| 33. |
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| 34. |
- Thorleifsdottir, Ragna Hlin, et al.
(author)
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Patient-reported Outcomes and Clinical Response in Patients with Moderate-to-severe Plaque Psoriasis Treated with Tonsillectomy : A Randomized Controlled Trial
- 2017
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In: Acta Dermato-Venereologica. - : Medical Journals Sweden AB. - 0001-5555 .- 1651-2057. ; 97:3, s. 340-345
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Journal article (peer-reviewed)abstract
- Psoriasis is a chronic inflammatory skin disease with profound effects on patients' health-related quality of life (HRQoL). Twenty-nine patients with plaque psoriasis and a history of streptococcal-associated psoriasis exacerbations were randomly assigned to tonsillectomy (n = 15) or control (n = 14) groups and followed for 24 months. Patients were evaluated with the Psoriasis Disability Index, Psoriasis Life Stress Inventory and Psoriasis Area and Severity Index. HRQoL and psoriasis-related stress improved significantly in the tonsillectomy group compared with the control group (p = 0.037 and p = 0.002, respectively), with a mean 50% improvement in HRQoL and a mean 59% improvement in psoriasis-induced stress. Clinical improvement correlated significantly with improved HRQoL (r = 0.297, p = 0.008) and psoriasis-related stress (r = 0.310, p = 0.005). Of the tonsillectomized patients, 87% concluded that the procedure was worthwhile. Tonsillectomy may improve quality of life for selected patients with plaque psoriasis.
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| 35. |
- Thorleifsdottir, Ragna H., et al.
(author)
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Throat Infections are Associated with Exacerbation in a Substantial Proportion of Patients with Chronic Plaque Psoriasis
- 2016
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In: Acta Dermato-Venereologica. - : Medical Journals Sweden AB. - 0001-5555 .- 1651-2057. ; 96:6, s. 788-791
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Journal article (peer-reviewed)abstract
- Streptococcal throat infections are known to trigger or exacerbate psoriasis, and several studies support the benefit of tonsillectomy. To evaluate the potential of tonsillectomy as a treatment, we used a retrospective study-specific questionnaire to assess the proportion of psoriasis patients with sore throat-associated psoriasis exacerbations. Our survey sampled 275 psoriasis patients. Of patients with plaque psoriasis, 42% reported sore throat-associated psoriasis exacerbations, and of patients with confirmed streptococcal infections, 72% reported aggravation. Notably, women and patients with early onset psoriasis were more likely to report psoriasis exacerbation after a sore throat (p< 0.001, p = 0.046, respectively). Other psoriasis aggravation factors were more common in patients with sore throat-associated exacerbations (p < 0.01). Of tonsillectomized patients, 49% reported subsequent improvement and had more frequent sore throat -associated aggravation of psoriasis than patients who did not improve after tonsillectomy (p=0.015). These findings suggest a closer association between sore throats, streptococcal throat infections and plaque psoriasis than reported previously.
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| 36. |
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