Tor-Ivar Karlsen

Dr. Tor-Ivar Karlsen

orcid

Research Focus & Metrics

Academic Career Length

16Years (2011-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications
1 March 2015 in Surgery for Obesity and Related Diseases
Verified
Journal Article
Open access
JAJohn Roger Andersen
John Roger Andersen
AAAnny Aasprang
Anny Aasprang
TKTor-Ivar Karlsen
Tor-Ivar Karlsen
GNGerd Karin Natvig
Gerd Karin Natvig
VVVilly Våge
Villy Våge
RKRonette L. Kolotkin
Ronette L. Kolotkin
Impaired health-related quality of life (HRQoL) is common in bariatric surgery candidates and is often one of the motivating factors for seeking bariatric surgery. Although many studies have reported changes in HRQoL after bariatric surgery, few are long-term prospective studies and no systematic review has been conducted. A systematic database search identified studies reporting HRQoL preoperatively and≥5 years after bariatric surgery. Change in HRQoL over time was the outcome variable, divided into primary and secondary outcomes. Seven prospective cohort studies met the inclusion criteria. Eight HRQoL measures and 6 surgical methods were identified. Long-term follow-up time ranged from 5-10 years, sample sizes from 44 to 655 patients, and follow-up rates from 61% to 92%. None of the 7 studies were randomized controlled trials, and only 2 studies used control groups. Six of 7 studies showed statistically significant improvements in all of the primary outcomes, and 1 study showed statistically significant improvements in 1 of 2 primary outcomes. Of the statistically significant HRQoL improvements, 92% were clinically meaningful. Peak improvements in primary HRQoL outcomes were typically observed during the first years of follow-up, followed by a gradual decline that seemed to stabilize 5 years postoperatively. Long-term HRQoL scores typically remained improved relative to preoperative scores but were somewhat below population norm scores. In conclusion, while bariatric surgery candidates reported impaired HRQoL presurgically, their HRQoL improved considerably after bariatric surgery and much of the initial HRQoL improvements were maintained over the long term.

1 January 2011 in Obesity Facts
Verified
Journal Article
Open access
PDF file
TKTor-Ivar Karlsen
Tor-Ivar Karlsen
ETEinar K. Tveitå
Einar K. Tveitå
GNGerd K. Natvig
Gerd K. Natvig
STSerena Tonstad
Serena Tonstad
JHJøran Hjelmesæth
Jøran Hjelmesæth
Background: The Medical Outcome Study 36-Item Short Form Health Survey (SF-36) is one of the most commonly applied generic quality of life instruments. The construct validity of the instrument in patients with morbid obesity is not established. Participants and Methods: A total of 475 morbidly obese patients (68% women) with a mean (standard deviation) age of 44.7 (11.8) years, weight of 123.5 (24.1) kg and BMI of 41.7 (6.3) kg/m2, who had been referred to a rehabilitation center, completed the SF-36 form. Exploratory factor analyses were performed to examine the underlying component structure of the questionnaire. Confirmatory factor analyses were performed to assess model fit. Results: The analysis suggested a 6-component structure rather than the 8-component structure used in the original SF-36. The first component consisted of items from the physical functioning subscale, the role physical subscale and the general health subscale, and explained 31% of the variance. The 6 components explained 61% of the total variance. The items loaded as expected in a physical and mental component. The assessment of model fit confirmed these findings. Conclusion: The 2 summary scales of the SF-36 have satisfactory validity in patients with morbid obesity. However, the validity of the 8 subscales is questionable, and the subscales should be interpreted with care.

1 January 2013 in Health and Quality of Life Outcomes
Verified
Journal Article
Open access
PDF file
TKTor-Ivar Karlsen
Tor-Ivar Karlsen
RLRandi Størdal Lund
Randi Størdal Lund
JRJo Røislien
Jo Røislien
STSerena Tonstad
Serena Tonstad
GNGerd Karin Natvig
Gerd Karin Natvig
JHJøran Hjelmesæth
Jøran Hjelmesæth
There is little robust evidence relating to changes in health related quality of life (HRQL) in morbidly obese patients following a multidisciplinary non-surgical weight loss program or laparoscopic Roux-en-Y Gastric Bypass (RYGB). The aim of the present study was to describe and compare changes in five dimensions of HRQL in morbidly obese subjects. In addition, we wanted to assess the clinical relevance of the changes in HRQL between and within these two groups after one year. We hypothesized that RYGB would be associated with larger improvements in HRQL than a part residential intensive lifestyle-intervention program (ILI) with morbidly obese subjects.

1 March 2021 in Social Science & Medicine
Verified
Journal Article
Open access
BABjørnulf Arntsen
Bjørnulf Arntsen
DTDag Olaf Torjesen
Dag Olaf Torjesen
TKTor-Ivar Karlsen
Tor-Ivar Karlsen
Throughout Europe, local health services are increasingly being provided through various forms of inter-municipal cooperation (IMC). One of the most common forms of IMC is when small municipalities delegate the operational responsibility for providing health services to a larger host municipality. However, despite the size asymmetry usually inherent in this type of IMC, this aspect has largely been neglected in the existing literature, which mainly focuses on the size of individual municipalities. Based on data from 97 partner municipalities and 25 host municipalities in Norway, this study examines how varying degrees of size asymmetry between them affect the perceived service quality and loss of autonomy resulting from IMC in health services. From the perspective of the relatively smaller partner municipalities, the results suggest that these are likely to benefit greatly from size asymmetry in terms of improved service quality, although this would appear to be at the expense of losing decision-making autonomy to their host. However, from the perspective of the relatively larger hosts municipalities, this type of asymmetry is likely to affect service quality negatively while having no effect on decision-making autonomy.

1 January 2013 in Health and Quality of Life Outcomes
Verified
Journal Article
Open access
PDF file
TKTor-Ivar Karlsen
Tor-Ivar Karlsen
MSMaryon Søhagen
Maryon Søhagen
JHJøran Hjelmesæth
Jøran Hjelmesæth
Studies of lifestyle intervention programs in morbid obesity report large variations in weight loss outcomes. This is reported not only between but also within standardized programs. Such reports point to participants’ characteristics as possible predictors of this outcome. The aim of this prospective cohort study was to identify predictors of weight loss after a 1-year partly residential intensive lifestyle intervention program (ILI).

22 July 2020 in BMC Nursing
Verified
Journal Article
Open access
PDF file
TVTorunn Kitty Vatnøy
Torunn Kitty Vatnøy
MSMarianne Sundlisæter Skinner
Marianne Sundlisæter Skinner
TKTor-Ivar Karlsen
Tor-Ivar Karlsen
BDBjørg Dale
Bjørg Dale
Background: The primary health care services are becoming increasingly complex, which presents challenges for the municipal nursing services. In Norway, municipal in-patient acute care (MipAC) has been introduced in all municipalities, and the competence at the services has been questioned. Few studies have examined the nursing services in the units. This study aims to get an overview of the nursing competence in those units across geographical regions, and different groups of organisation and localisation. Methods: A cross-sectional study was conducted, and an ad hoc questionnaire was distributed to first-line leaders in all the MipAC units in Norway. Data were collected in the period between 6 March 2019 to 6 June 2019. Measures to get an overview of the nursing competence were ratio of registered nurses (RNs) in staff, count of shifts with only one RN on duty and count of RNs with master’s degrees/specialisation. Descriptive comparative statistics were used. Results: Of all 226 first-line leaders invited to participate, 207 (91.6%) responded to the questionnaire. Overall a considerable variance across the sample was revealed. The median ratio of RNs in staff was 56 (IQR = 40–70), the count of shifts with only one RN on duty median 28 (IQR = 5–49), and the count of RNs with a master’s degree or specialisation median 3 (IQR = 0–5). The regions of Northern and Central Norway, MipACs located in nursing home and MipACs organised at long-term care units, showed significantly lower nursing competence in staff compared to the remaining institution and organisations. Conclusion: This study generates knowledge that can inform planning, priorities and interventions that may be initiated at all organisational and political levels concerning the MipAC services. An overall conclusion is that advanced nursing competence is lacking. The study also highlights the most urgent direction for improvements regarding nursing competence in the services. It seemed to be MipACs in Northern and Central Norway, and those located at nursing homes organised together with long-term care units, that needed improvements the most.